Google Git
Sign in
eclipse / gerrit / www.eclipse.org / n4js / 0f05d1ab3705f66f57f5e24fd62cf4c362fa37c8 / . / design / external_libraries.html
blob: 32a04001d23faea05f2bf01799de11f40627ae2e [file] [log] [blame]
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 1.5.5">
<meta name="author" content="2019-08-08 13:15:33 CEST">
<title>N4JS Design Specification</title>
<link rel="stylesheet" href="styles/spec.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.3/css/font-awesome.min.css">
<!-- ************* docinfo ******************************************************************* -->
<!-- ************* Favicon ************-->
<link rel="icon" href="images/favicon.ico" />
<!-- ************* Back-to-top JQuery ************* -->
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js"></script>
<link href="styles/prism.min.css" rel="stylesheet" />
<script type="text/javascript" async
src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.2/MathJax.js?config=TeX-MML-AM_CHTML">
</script>
<!-- ************* Styles ************* -->
<link rel="stylesheet" type="text/css" href="styles/n4jsspec-adoc.css">
<!-- ****************** NavBar ****************** -->
<div id="menubar">
<div class="banner">
<a href="https://www.eclipse.org/n4js/#"><img id="logo" src="images/n4js-logo.png" alt="Eclipse N4JS"></a>
</div>
<ul>
<li><a href="index.html">Index</a></li>
</ul>
</div>
<!-- ************* docinfo ******************************************************************* -->
<style>
.admonitionblock td.icon .icon-todo:before{content:"\f249";color:#f4ee42}
</style>
</head>
<body class="book toc2 toc-left">
<div id="header">
<h1>N4JS Design Specification</h1>
<div class="details">
<span id="author" class="author">2019-08-08 13:15:33 CEST</span><br>
<span id="revnumber">version 0.9</span>
</div>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="introduction.html#_introduction">1. Introduction</a>
<ul class="sectlevel2">
<li><a href="introduction.html#notation">1.1. Notation</a></li>
<li><a href="introduction.html#sec:IDE_Overview">1.2. IDE Components</a>
<ul class="sectlevel3">
<li><a href="introduction.html#sec:Naming_Conventions">1.2.1. Naming Conventions</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="eclipse_setup.html#_eclipse-setup">2. Eclipse Setup</a>
<ul class="sectlevel2">
<li><a href="eclipse_setup.html#_system-requirements">2.1. System Requirements</a></li>
<li><a href="eclipse_setup.html#_contribute">2.2. Contribute</a>
<ul class="sectlevel3">
<li><a href="eclipse_setup.html#_eclipse-installer">2.2.1. Eclipse Installer</a>
<ul class="sectlevel4">
<li><a href="eclipse_setup.html#_changing-the-setup-script">2.2.1.1. Changing the Setup Script</a></li>
</ul>
</li>
<li><a href="eclipse_setup.html#_manual-ide-configuration">2.2.2. Manual IDE Configuration</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="release_engineering.html#_release-engineering">3. Release Engineering</a>
<ul class="sectlevel2">
<li><a href="release_engineering.html#_nightly-build-on-eclipse-infrastructure">3.1. Nightly build on Eclipse infrastructure</a></li>
<li><a href="release_engineering.html#_build-the-n4js-ide-from-command-line">3.2. Build the N4JS IDE from command line</a>
<ul class="sectlevel3">
<li><a href="release_engineering.html#_publish-maven-tooling-code-org-eclipse-n4js-releng-util-code">3.2.1. Publish maven-tooling <code>org.eclipse.n4js.releng.util</code></a></li>
<li><a href="release_engineering.html#sec:test-verdaccio">3.2.2. Test Verdaccio containing n4js-libs</a></li>
<li><a href="release_engineering.html#_generation-of-eclipse-help-for-spec-and-design-document">3.2.3. Generation of Eclipse help for spec and design document</a></li>
</ul>
</li>
<li><a href="release_engineering.html#_updating-frameworks-and-dependencies">3.3. Updating frameworks and dependencies</a>
<ul class="sectlevel3">
<li><a href="release_engineering.html#_update-of-eclipse-emf-xtext-etc">3.3.1. Update of Eclipse, EMF, Xtext, etc.</a></li>
<li><a href="release_engineering.html#_update-of-the-embedded-jre">3.3.2. Update of the embedded JRE</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="tips_and_tricks.html#_tips-and-tricks">4. Tips and Tricks</a>
<ul class="sectlevel2">
<li><a href="tips_and_tricks.html#_naming">4.1. Naming</a></li>
<li><a href="tips_and_tricks.html#_logging">4.2. Logging</a></li>
<li><a href="tips_and_tricks.html#_cancellation-handling">4.3. Cancellation Handling</a></li>
<li><a href="tips_and_tricks.html#_caching">4.4. Caching</a></li>
<li><a href="tips_and_tricks.html#_dependency-injection">4.5. Dependency Injection</a></li>
<li><a href="tips_and_tricks.html#_miscellaneous">4.6. Miscellaneous</a></li>
</ul>
</li>
<li><a href="parser.html#_parser">5. Parser</a>
<ul class="sectlevel2">
<li><a href="parser.html#sec:Parser_Overview">5.1. Overview</a></li>
<li><a href="parser.html#sec:N4JS_Parser">5.2. N4JS Parser</a></li>
<li><a href="parser.html#sec:Parser_Generation_Post_Processing">5.3. Parser Generation Post-Processing</a>
<ul class="sectlevel3">
<li><a href="parser.html#sec:Automatic_Semicolon_Insertion">5.3.1. Automatic Semicolon Insertion</a>
<ul class="sectlevel4">
<li><a href="parser.html#sec:Injected_code_in_the_Antlr_grammar_file">5.3.1.1. Injected code in the Antlr grammar file</a></li>
<li><a href="parser.html#sec:Customized_error_recovery">5.3.1.2. Customized error recovery</a></li>
</ul>
</li>
<li><a href="parser.html#sec:_No_line_terminator_allowed_here__handling">5.3.2. Async and <code>No line terminator allowed here</code> Handling</a></li>
<li><a href="parser.html#sec:Regular_Expression">5.3.3. Regular Expression</a></li>
<li><a href="parser.html#sec:Unicode">5.3.4. Unicode</a></li>
<li><a href="parser.html#sec:Literals">5.3.5. Literals</a></li>
</ul>
</li>
<li><a href="parser.html#sec:Modifiers">5.4. Modifiers</a></li>
<li><a href="parser.html#sec:Conflict_Resolutions">5.5. Conflict Resolutions</a>
<ul class="sectlevel3">
<li><a href="parser.html#sec:Reserved_Keywords_vs__Identifier_Names">5.5.1. Reserved Keywords vs. Identifier Names</a></li>
<li><a href="parser.html#sec:Operators_and_Generics">5.5.2. Operators and Generics</a></li>
</ul>
</li>
<li><a href="parser.html#sec:Content_Assist_Parser">5.6. Content-Assist Parser</a></li>
</ul>
</li>
<li><a href="type_system.html#_type-system">6. Type System</a>
<ul class="sectlevel2">
<li><a href="type_system.html#sec:Type_Model_and_Grammar">6.1. Type Model and Grammar</a>
<ul class="sectlevel3">
<li><a href="type_system.html#sec:Type_Model_Overview">6.1.1. Type Model Overview</a></li>
<li><a href="type_system.html#sec:Built_in_Types">6.1.2. Built-in and Primitive Types</a></li>
<li><a href="type_system.html#sec:Type_Model_DSL">6.1.3. Type Model DSL</a></li>
</ul>
</li>
<li><a href="type_system.html#sec:Type_System_Implementation">6.2. Type System Implementation</a></li>
<li><a href="type_system.html#sec:Type_Inference_combined_with_AST_Traversal">6.3. Type Inference of AST</a>
<ul class="sectlevel3">
<li><a href="type_system.html#sec:Type_Inference_combined_with_AST_Traversal__Background">6.3.1. Background</a></li>
<li><a href="type_system.html#sec:Triggering_Type_Inference_of_AST">6.3.2. Triggering</a></li>
<li><a href="type_system.html#sec:Traversal_Order_During_Type_Inference_of_AST">6.3.3. Traversal Order</a></li>
<li><a href="type_system.html#sec:Cross_References_During_Type_Inference_of_AST">6.3.4. Cross-References</a></li>
<li><a href="type_system.html#sec:Function_Accessor_Bodies_During_Type_Inference_of_AST">6.3.5. Function/Accessor Bodies</a></li>
<li><a href="type_system.html#sec:Poly_Expressions_During_Type_Inference_of_AST">6.3.6. Poly Expressions</a></li>
<li><a href="type_system.html#sec:Constraint_Solver_used_During_Type_Inference_of_AST">6.3.7. Constraint Solver</a></li>
<li><a href="type_system.html#sec:Type_Guards_During_Type_Inference_of_AST">6.3.8. Type Guards</a></li>
</ul>
</li>
<li><a href="type_system.html#sec:Structural_Typing">6.4. Structural Typing</a></li>
</ul>
</li>
<li><a href="type_index.html#_type-index">7. Type Index</a>
<ul class="sectlevel2">
<li><a href="type_index.html#sec:Type_Index_Design_Rationale">7.1. Design Rationale</a>
<ul class="sectlevel3">
<li><a href="type_index.html#sec:Getting_the_Xtext_Index_Content_IResourceDescriptions">7.1.1. Getting the Xtext Index (<code>IResourceDescriptions</code>) Content</a></li>
</ul>
</li>
<li><a href="type_index.html#sec:Design_Overview">7.2. Design Overview</a></li>
<li><a href="type_index.html#sec:N4JS_Resource_Load_States">7.3. N4JS Resource Load States</a></li>
<li><a href="type_index.html#sec:Type_Builder">7.4. Types Builder</a>
<ul class="sectlevel3">
<li><a href="type_index.html#sec:Type_Inference_not_allowed_in_Type_Builder">7.4.1. Type Inference not allowed in Types Builder</a></li>
<li><a href="type_index.html#sec:ComputedTypeReferences">7.4.2. Deferred Type References</a></li>
<li><a href="type_index.html#sec:Use_cases_of_ComputedTypeRef">7.4.3. Use cases of DeferredTypeRef</a></li>
</ul>
</li>
<li><a href="type_index.html#sec:Incremental_Builder_Overview">7.5. Incremental Builder (Overview)</a>
<ul class="sectlevel3">
<li><a href="type_index.html#sec:Incremental_Builder_Overview__XtextBuilder">7.5.1. XtextBuilder</a></li>
<li><a href="type_index.html#sec:Incremental_Builder_Overview__IBuilderState">7.5.2. IBuilderState</a>
<ul class="sectlevel4">
<li><a href="type_index.html#copy-and-update-xtext-index">7.5.2.1. Copy and Update Xtext Index</a></li>
<li><a href="type_index.html#build-state-setup-phase">7.5.2.2. Build State Setup Phase</a></li>
<li><a href="type_index.html#process-queued-uris">7.5.2.3. Process Queued URIs</a></li>
<li><a href="type_index.html#queueing-affected-resources">7.5.2.4. Queueing Affected Resources</a></li>
</ul>
</li>
<li><a href="type_index.html#sec:Incremental_Builder_Overview__Example">7.5.3. Example</a></li>
</ul>
</li>
<li><a href="type_index.html#dirty-state-handling">7.6. Dirty state handling</a>
<ul class="sectlevel3">
<li><a href="type_index.html#use-case-restoring-types-from-user-data">7.6.1. Use case: Restoring types from user data</a></li>
<li><a href="type_index.html#use-case-updating-the-xtext-index">7.6.2. Use case: Updating the Xtext index</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="project_model.html#_project-model">8. Project Model</a>
<ul class="sectlevel2">
<li><a href="project_model.html#sec:Package_json">8.1. Package.json File</a></li>
<li><a href="project_model.html#_accessing-project-information">8.2. Accessing Project Information</a>
<ul class="sectlevel3">
<li><a href="project_model.html#sec:IN4JSCore">8.2.1. IN4JSCore</a></li>
<li><a href="project_model.html#sec:N4JSModel">8.2.2. N4JSModel</a></li>
<li><a href="project_model.html#sec:N4JSWorkspace">8.2.3. N4JSWorkspace</a></li>
<li><a href="project_model.html#sec:N4JSProject">8.2.4. N4JSProject</a></li>
<li><a href="project_model.html#sec:SourceContainer">8.2.5. SourceContainer</a></li>
<li><a href="project_model.html#sec:N4JSProjectsStateHelper">8.2.6. N4JSProjectsStateHelper</a></li>
</ul>
</li>
<li><a href="project_model.html#sec:Caching">8.3. Caching</a>
<ul class="sectlevel3">
<li><a href="project_model.html#_caching-of-externallibraryworkspace">8.3.1. Caching of ExternalLibraryWorkspace</a></li>
<li><a href="project_model.html#_caching-of-n4jsprojectsstatehelper">8.3.2. Caching of N4JSProjectsStateHelper</a></li>
</ul>
</li>
<li><a href="project_model.html#sec:WildcardPathFilter">8.4. WildcardPathFilter</a></li>
<li><a href="project_model.html#sec:ProjectUtils">8.5. ProjectUtils</a></li>
</ul>
</li>
<li><a href="binding.html#_binding">9. Binding</a>
<ul class="sectlevel2">
<li><a href="binding.html#sec:Binding_Design_Rationale">9.1. Design Rationale</a></li>
<li><a href="binding.html#sec:Binding_to_Members">9.2. Binding to Members</a></li>
<li><a href="binding.html#sec:Binding_Getter_Setter">9.3. Getter / Setter Binding</a></li>
<li><a href="binding.html#chap:Statics">9.4. Static Member Binding</a></li>
<li><a href="binding.html#sec:Binding_Enumeration">9.5. Enumeration Literals Binding</a></li>
<li><a href="binding.html#sec:Accessibility_of_types_and_members">9.6. Accessibility of types and members</a></li>
<li><a href="binding.html#sec:Member_Scope_Example">9.7. Member Scope Example</a></li>
<li><a href="binding.html#sec:Scoping_for_Members_of_Composed_Type_Explained">9.8. Scoping for Members of Composed Type (Union/Intersection) Example</a></li>
<li><a href="binding.html#sec:Binding_of_Structurally_References_Types">9.9. Structurally References Types</a></li>
<li><a href="binding.html#sec:Building">9.10. Building</a>
<ul class="sectlevel3">
<li><a href="binding.html#sec:Build_Phases">9.10.1. Build Phases</a></li>
<li><a href="binding.html#sec:Build_Scenarios">9.10.2. Build Scenarios</a></li>
<li><a href="binding.html#sec:Lazy_linking_problem">9.10.3. Lazy linking problem</a></li>
</ul>
</li>
<li><a href="binding.html#sec:Proxies_and_Proxy_Resolution">9.11. Proxies and Proxy Resolution (Overview)</a>
<ul class="sectlevel3">
<li><a href="binding.html#xtexts-lazy-linking-proxies">9.11.1. Xtext’s Lazy Linking Proxies</a></li>
<li><a href="binding.html#standard-emf-proxies">9.11.2. Standard EMF Proxies</a></li>
<li><a href="binding.html#_how-is-proxy-resolution-triggered">9.11.3. How is Proxy Resolution Triggered?</a></li>
<li><a href="binding.html#_when-is-proxy-resolution-allowed">9.11.4. When is Proxy Resolution Allowed?</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="validation.html#_validation">10. Validation</a>
<ul class="sectlevel2">
<li><a href="validation.html#sec:validation_overview">10.1. Validation overview</a></li>
<li><a href="validation.html#sec:validation_control_flow">10.2. Validation control flow</a></li>
<li><a href="validation.html#sec:validation_issue_ids">10.3. Issue IDs and Messages</a></li>
<li><a href="validation.html#sec:validation_usage_patterns">10.4. Usage Pattern</a></li>
<li><a href="validation.html#sec:validation_links">10.5. Links</a></li>
</ul>
</li>
<li><a href="references.html#_references">11. References</a>
<ul class="sectlevel2">
<li><a href="references.html#sec:usecases">11.1. Use cases</a></li>
<li><a href="references.html#sec:calculation_algorithm">11.2. Calculation algorithm</a>
<ul class="sectlevel3">
<li><a href="references.html#sec:Xtext_default_implementation">11.2.1. Xtext default implementation</a></li>
<li><a href="references.html#sec:N4_implementation">11.2.2. N4JS implementation</a></li>
</ul>
</li>
<li><a href="references.html#sec:PerformanceOfDependencyCalculation">11.3. Performance Of Dependency Calculation</a></li>
<li><a href="references.html#sec:kinds_of_references">11.4. Kinds of references</a>
<ul class="sectlevel3">
<li><a href="references.html#sec:Cross_References_to_be_ignored">11.4.1. Cross References to be ignored</a></li>
<li><a href="references.html#sec:Cross_References_to_be_handled">11.4.2. Cross References to be handled</a></li>
</ul>
</li>
<li><a href="references.html#sec:transitive_dependencies">11.5. Transitive dependencies</a></li>
<li><a href="references.html#sec:find-references">11.6. Find references</a>
<ul class="sectlevel3">
<li><a href="references.html#_background">11.6.1. Background</a></li>
<li><a href="references.html#_how-find-references-work">11.6.2. How Find References Work</a>
<ul class="sectlevel4">
<li><a href="references.html#_step-1-convert-cursor-position-to-declared-element">11.6.2.1. Step 1: Convert Cursor Position to Declared Element</a></li>
<li><a href="references.html#_step-2-convert-declared-element-to-target-uris">11.6.2.2. Step 2: Convert Declared Element to Target URIs</a></li>
<li><a href="references.html#_step-3-filter-potential-resources">11.6.2.3. Step 3: Filter Potential Resources</a></li>
<li><a href="references.html#_step-4-search-references-in-resource">11.6.2.4. Step 4: Search References in Resource</a></li>
<li><a href="references.html#_limitations-and-possible-enhancements">11.6.2.5. Limitations and Possible Enhancements</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><a href="compilation.html#_compilation">12. Compilation</a>
<ul class="sectlevel2">
<li><a href="compilation.html#chap:compilation">12.1. Introduction</a>
<ul class="sectlevel3">
<li><a href="compilation.html#sec:general_design_rationals">12.1.1. General design rationals</a>
<ul class="sectlevel4">
<li><a href="compilation.html#sec:logging_and_error_reporting">12.1.1.1. Logging and error reporting</a></li>
<li><a href="compilation.html#sec:progress_monitor">12.1.1.2. Progress monitor</a></li>
</ul>
</li>
<li><a href="compilation.html#sec:Xtext_Integration">12.1.2. Xtext Integration</a>
<ul class="sectlevel4">
<li><a href="compilation.html#sec:xtext_default_behaviour">12.1.2.1. Xtext default behaviour</a></li>
<li><a href="compilation.html#sec:n4js_requirements">12.1.2.2. N4JS requirements</a></li>
<li><a href="compilation.html#sec:compiler_discovery_in_ui">12.1.2.3. Compiler discovery in UI</a></li>
<li><a href="compilation.html#sec:compiler_discovery_in_headless">12.1.2.4. Compiler discovery in headless</a></li>
<li><a href="compilation.html#sec:general_generator_implementation">12.1.2.5. General generator implementation</a></li>
<li><a href="compilation.html#sec:general_generator_activation">12.1.2.6. General generator activation</a></li>
</ul>
</li>
<li><a href="compilation.html#sec:Overview_of_Input_Models">12.1.3. Overview of the Input Models</a></li>
</ul>
</li>
<li><a href="compilation.html#sec:Core_Generator">12.2. Generators</a>
<ul class="sectlevel3">
<li><a href="compilation.html#sec:Compiler_Components">12.2.1. Generator Components</a></li>
<li><a href="compilation.html#sec:Generator_architecture">12.2.2. Generator architecture</a></li>
<li><a href="compilation.html#sec:Unified_Compiler_Configuration">12.2.3. Unified Compiler Configuration</a></li>
</ul>
</li>
<li><a href="compilation.html#sec:Transpilers">12.3. Transpilers</a>
<ul class="sectlevel3">
<li><a href="compilation.html#sec:Phases">12.3.1. Overview</a></li>
<li><a href="compilation.html#relation-between-ast-and-im">12.3.2. Relation between AST and IM</a></li>
<li><a href="compilation.html#implementation-overview">12.3.3. Implementation Overview</a></li>
<li><a href="compilation.html#sec:Guidelines_for_Implementing_Transformations">12.3.4. Guidelines for Implementing Transformations</a></li>
<li><a href="compilation.html#symbol-table-in-the-im">12.3.5. Symbol Table in the IM</a></li>
</ul>
</li>
<li><a href="compilation.html#sec:N4JS_to_EcmaScript_Transpiler">12.4. N4JS-to-EcmaScript Transpiler</a>
<ul class="sectlevel3">
<li><a href="compilation.html#sec:Overview_of_Transformations">12.4.1. Overview of Transformations</a></li>
<li><a href="compilation.html#sec:Transpiling_members">12.4.2. Transpiling members</a>
<ul class="sectlevel4">
<li><a href="compilation.html#sec:Transpiling_members__Delegating_members">12.4.2.1. Techniques for special member handling</a></li>
<li><a href="compilation.html#sec:Transpiling_members__Partial_shadowing_of_getter_setter_pairs">12.4.2.2. Partial shadowing</a></li>
<li><a href="compilation.html#sec:Transpiling_members__Consuming_or_inheriting_members_of_an_interface">12.4.2.3. Consuming or inheriting members of an interface</a></li>
<li><a href="compilation.html#sec:Transpiling_members__Static_polyfill">12.4.2.4. Static polyfill</a></li>
<li><a href="compilation.html#sec:Transpiling_members__API_implementation_stubs">12.4.2.5. API / implementation stubs</a></li>
</ul>
</li>
<li><a href="compilation.html#sec:Support_for_incomplete_API_implementation_testing_in_the_N4JS_to_EcmaScript_5_Transpiler">12.4.3. Support for incomplete API implementation testing</a>
<ul class="sectlevel4">
<li><a href="compilation.html#sec:Modifications_in_Impl_projects">12.4.3.1. Modifications in Impl projects</a></li>
<li><a href="compilation.html#sec:Implementation_of_stub_generation">12.4.3.2. Implementation of stub-generation</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="compilation.html#sec:n4jsc_Headless_Compiler_Interface">12.5. n4jsc Headless Compiler Interface</a>
<ul class="sectlevel3">
<li><a href="compilation.html#sec:building_the_headless_compiler">12.5.1. building the headless compiler</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="execution.html#_execution">13. Execution</a>
<ul class="sectlevel2">
<li><a href="execution.html#sec:N4JS_Project_Execution_And_Linking_Model">13.1. N4JS Project Execution And Linking Model</a>
<ul class="sectlevel3">
<li><a href="execution.html#subsec:N4JS_Execution_With_NodeJS">13.1.1. N4JS Execution With NodeJS</a></li>
</ul>
</li>
<li><a href="execution.html#sec:N4JS_Execution_And_Linking_File">13.2. N4JS Execution And Linking File</a>
<ul class="sectlevel3">
<li><a href="execution.html#subsec:NodeJS_Specific_ELF">13.2.1. NodeJS Specific ELF</a></li>
</ul>
</li>
<li><a href="execution.html#sec:Runners-execution">13.3. Runners</a>
<ul class="sectlevel3">
<li><a href="execution.html#subsec:N4_Runtime_Environments_Convention">13.3.1. N4 Runtime Environments Convention</a></li>
<li><a href="execution.html#subsec:Passing_Information_from_IDE_to_Execution_Code_in_Runtime_Environment">13.3.2. Passing Information from IDE to Execution Code in Runtime Environment</a></li>
<li><a href="execution.html#subsec:Runners_Design">13.3.3. Runners Design</a></li>
</ul>
</li>
<li><a href="execution.html#sec:Legacy_Execution_Engine">13.4. Legacy Execution Engine</a></li>
<li><a href="execution.html#sec:Design">13.5. Design</a>
<ul class="sectlevel3">
<li><a href="execution.html#sec:Usage_Outside_N4JSIDE">13.5.1. Usage Outside N4JSIDE</a>
<ul class="sectlevel4">
<li><a href="execution.html#sec:Use_Node_with_Maven">13.5.1.1. Use Node with Maven</a></li>
</ul>
</li>
<li><a href="execution.html#sec:Usage_Inside_N4JSIDE">13.5.2. Usage Inside N4JSIDE</a></li>
</ul>
</li>
<li><a href="execution.html#sec:Runtime_Injection">13.6. Runtime Injection</a>
<ul class="sectlevel3">
<li><a href="execution.html#sec:Running_String_Code">13.6.1. Running String Code</a></li>
<li><a href="execution.html#sec:Running_File_Code">13.6.2. Running File Code</a></li>
<li><a href="execution.html#sec:Injection_Code_Example">13.6.3. Injection Code Example</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="tests.html#_tests">14. Tests</a>
<ul class="sectlevel2">
<li><a href="tests.html#sec:Performance_Tests">14.1. Performance Tests</a>
<ul class="sectlevel3">
<li><a href="tests.html#sec:Synthetic_Performance_Tests">14.1.1. Synthetic Performance Tests</a>
<ul class="sectlevel4">
<li><a href="tests.html#sec:Design_of_Generator">14.1.1.1. Design of Generator</a></li>
<li><a href="tests.html#sec:Design_of_Performance_Test_Execution">14.1.1.2. Design of Performance Test Configuration and Execution</a></li>
<li><a href="tests.html#sec:JUnit_Configuration">14.1.1.3. JUnit Configuration</a></li>
<li><a href="tests.html#sec:JUnitBenchmark_Test_Configuration">14.1.1.4. JUnitBenchmark Test Configuration</a></li>
<li><a href="tests.html#sec:JUnitBenchmark_Report_Configuration">14.1.1.5. JUnitBenchmark Report Configuration</a></li>
<li><a href="tests.html#sec:JUnitBenchmark_Run_Configuration">14.1.1.6. JUnitBenchmark Run Configuration</a></li>
<li><a href="tests.html#sec:JUnitBenchmark_Example">14.1.1.7. JUnitBenchmark Example</a></li>
<li><a href="tests.html#sec:Note_on_Jenkins_Job">14.1.1.8. Note on Jenkins Job</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="tests.html#sec:ECMA_Tests">14.2. ECMA Tests</a>
<ul class="sectlevel3">
<li><a href="tests.html#sec:Grammar_Tests">14.2.1. Grammar Tests</a>
<ul class="sectlevel4">
<li><a href="tests.html#sec:Negative_Tests">14.2.1.1. Negative Tests</a></li>
<li><a href="tests.html#sec:Test_Exclusion">14.2.1.2. Test Exclusion</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="tests.html#sec:Integration_Tests">14.3. Integration Tests</a></li>
<li><a href="tests.html#sec:Test_Helpers">14.4. Test Helpers</a>
<ul class="sectlevel3">
<li><a href="tests.html#sec:Parameterized_N4JS_Tests">14.4.1. Parameterized N4JS tests</a>
<ul class="sectlevel4">
<li><a href="tests.html#sec:ParameterizedXtextRunner">14.4.1.1. ParameterizedXtextRunner</a></li>
<li><a href="tests.html#sec:TestCodeProvider">14.4.1.2. TestCodeProvider</a></li>
<li><a href="tests.html#sec:Example_Of_Parameterized_Parser_Test">14.4.1.3. Example of parameterized parser test</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="tests.html#sec:Issue_Suppression">14.5. Issue Suppression</a></li>
<li><a href="tests.html#sec:Xpect_Tests">14.6. Xpect Tests</a>
<ul class="sectlevel3">
<li><a href="tests.html#sec:Xpect_Test_Setup">14.6.1. Xpect Test Setup</a></li>
<li><a href="tests.html#sec:Xpect_Issue_Suppression">14.6.2. Xpect Issue Suppression</a></li>
<li><a href="tests.html#sec:Xpect_Provided_Test_Methods">14.6.3. Xpect Provided Test Methods</a>
<ul class="sectlevel4">
<li><a href="tests.html#errors">14.6.3.1. errors</a></li>
<li><a href="tests.html#warnings">14.6.3.2. warnings</a></li>
</ul>
</li>
<li><a href="tests.html#sec:N4JS_Specific_Xpect_Test_Methods">14.6.4. N4JS Specific Xpect Test Methods</a>
<ul class="sectlevel4">
<li><a href="tests.html#sec:XPECT_noerrors">14.6.4.1. noerrors and nowarnings</a></li>
<li><a href="tests.html#sec:XPECT_scope">14.6.4.2. scope</a></li>
<li><a href="tests.html#sec:XPECT_scopeWithPosition">14.6.4.3. scopeWithPosition</a></li>
<li><a href="tests.html#sec:XPECT_scopeWithResource">14.6.4.4. scopeWithResource</a></li>
<li><a href="tests.html#sec:XPECT_binding">14.6.4.5. binding</a></li>
<li><a href="tests.html#sec:XPECT_linkedPathname">14.6.4.6. linkedPathname</a></li>
<li><a href="tests.html#sec:XPECT_type_of">14.6.4.7. type of</a></li>
<li><a href="tests.html#sec:XPECT_expectedType">14.6.4.8. expectedType</a></li>
<li><a href="tests.html#sec:XPECT_elementKeyword">14.6.4.9. elementKeyword</a></li>
<li><a href="tests.html#sec:XPECT_accessModifier">14.6.4.10. accessModifier</a></li>
<li><a href="tests.html#sec:XPECT_compileResult">14.6.4.11. compileResult</a></li>
<li><a href="tests.html#sec:XPECT_output">14.6.4.12. output</a></li>
<li><a href="tests.html#sec:XPECT_outputRegEx">14.6.4.13. outputRegEx</a></li>
<li><a href="tests.html#sec:XPECT_calculatedAccessModifier">14.6.4.14. calculatedAccessModifier</a></li>
<li><a href="tests.html#sec:XPECT_spec">14.6.4.15. spec</a></li>
<li><a href="tests.html#sec:XPECT_deadCode">14.6.4.16. deadCode</a></li>
<li><a href="tests.html#sec:XPECT_returnOrThrows">14.6.4.17. returnOrThrows</a></li>
<li><a href="tests.html#sec:XPECT_lint">14.6.4.18. lint</a></li>
<li><a href="tests.html#sec:XPECT_lintFails">14.6.4.19. lintFails</a></li>
</ul>
</li>
<li><a href="tests.html#sec:FIXME_Xpect_modifier">14.6.5. FIXME Xpect modifier</a></li>
<li><a href="tests.html#sec:Expectmatrix_Xpect_Test_Methods">14.6.6. Expectmatrix Xpect tests</a></li>
<li><a href="tests.html#xpect-lint-tests">14.6.7. Xpect Lint Tests</a></li>
</ul>
</li>
<li><a href="tests.html#xpect-proposal-tests">14.7. Xpect Proposal Tests</a>
<ul class="sectlevel3">
<li><a href="tests.html#sec:Validation_vs__Non_Validation">14.7.1. Validation vs. Non-Validation</a></li>
<li><a href="tests.html#sec:General_Proposal_Test_Features">14.7.2. General Proposal Test Features</a>
<ul class="sectlevel4">
<li><a href="tests.html#sec:Test_Variables">14.7.2.1. Test Variables</a></li>
<li><a href="tests.html#sec:Location_and_Selection">14.7.2.2. at – Location and Selection</a></li>
<li><a href="tests.html#sec:Multi_Line_Expectations_in_Proposal_Tests">14.7.2.3. Multi Line Expectations in Proposal Tests</a></li>
<li><a href="tests.html#sec:Timeout">14.7.2.4. Timeout and Performance</a></li>
</ul>
</li>
<li><a href="tests.html#proposals-verify-existence-of-proposals">14.7.3. proposals – Verify Existence of Proposals</a></li>
<li><a href="tests.html#sec:Verify_displayed_string">14.7.4. display – Verify displayed string</a></li>
<li><a href="tests.html#sec:Apply_Proposal">14.7.5. apply – Apply Proposal</a>
<ul class="sectlevel4">
<li><a href="tests.html#resource-application-in-other-files">14.7.5.1. resource – application in other files</a></li>
</ul>
</li>
<li><a href="tests.html#sec:Content_Assist_Cycling">14.7.6. kind – Content Assist Cycling</a></li>
<li><a href="tests.html#fileValidVerify-validation-status">14.7.7. fileValid – Verify validation status</a></li>
</ul>
</li>
<li><a href="tests.html#sec:Apply_Proposal_And_Execute_Tests">14.8. Apply Proposal And Execute Tests</a></li>
<li><a href="tests.html#sec:Organize_Imports_Test">14.9. Organize Imports Test</a>
<ul class="sectlevel3">
<li><a href="tests.html#organizeimports">14.9.1. organizeImports</a></li>
</ul>
</li>
<li><a href="tests.html#sec:Access_Control_Test">14.10. Access Control Test</a>
<ul class="sectlevel3">
<li><a href="tests.html#test-scenarios">14.10.1. Test Scenarios</a></li>
<li><a href="tests.html#n4js-code-generator">14.10.2. N4JS Code Generator</a></li>
<li><a href="tests.html#xtext-issue-matcher">14.10.3. Xtext Issue Matcher</a></li>
</ul>
</li>
<li><a href="tests.html#sec:Smoke_Tests">14.11. Smoke Tests</a>
<ul class="sectlevel3">
<li><a href="tests.html#how-to-handle-smoke-test-errors">14.11.1. How to handle smoke test errors?</a></li>
<li><a href="tests.html#smoketester-and-exceptionanalyzer">14.11.2. SmokeTester and ExceptionAnalyzer</a></li>
</ul>
</li>
<li><a href="tests.html#sec:UI_Tests_with_SWTBot">14.12. UI Tests with SWTBot</a>
<ul class="sectlevel3">
<li><a href="tests.html#writing-swtbot-tests">14.12.1. Writing SWTBot Tests</a></li>
<li><a href="tests.html#running-swtbot-tests">14.12.2. Running SWTBot Tests</a></li>
</ul>
</li>
<li><a href="tests.html#sec:Debugging_UI_Tests">14.13. Debugging UI Tests</a>
<ul class="sectlevel3">
<li><a href="tests.html#sec:Connecting_to_the_X_server_on_the_build_node">14.13.1. Connecting to the X-server on the build-node</a></li>
<li><a href="tests.html#sec:Tools_to_investigate_the_java_stack">14.13.2. Tools to investigate the java-stack</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="ui_concepts.html#_ui-concepts">15. UI Concepts</a>
<ul class="sectlevel2">
<li><a href="ui_concepts.html#sec:User_Interface_Concepts">15.1. User Interface Concepts</a>
<ul class="sectlevel3">
<li><a href="ui_concepts.html#sec:Eclipse_UI_Concepts">15.1.1. Eclipse UI Concepts</a>
<ul class="sectlevel4">
<li><a href="ui_concepts.html#sec:Label_Provider">15.1.1.1. Label Provider</a></li>
<li><a href="ui_concepts.html#sec:Markers">15.1.1.2. Markers</a></li>
<li><a href="ui_concepts.html#sec:Commands__Toolbar_and_Menus">15.1.1.3. Commands, Toolbar and Menus</a></li>
<li><a href="ui_concepts.html#sec:Content_Assist">15.1.1.4. Content Assist</a></li>
<li><a href="ui_concepts.html#sec:Quick_Fixes">15.1.1.5. Quick Fixes</a></li>
<li><a href="ui_concepts.html#sec:Quick_Assist">15.1.1.6. Quick Assist</a></li>
<li><a href="ui_concepts.html#sec:Clean_Up_Actions">15.1.1.7. Clean Up Actions</a></li>
<li><a href="ui_concepts.html#sec:Save_Actions">15.1.1.8. Save Actions</a></li>
<li><a href="ui_concepts.html#sec:Auto_Edit">15.1.1.9. Auto Edit</a></li>
<li><a href="ui_concepts.html#sec:Template_Proposals">15.1.1.10. Template Proposals</a></li>
<li><a href="ui_concepts.html#sec:Outline_View___Quick_Outline">15.1.1.11. Outline View / Quick Outline</a></li>
<li><a href="ui_concepts.html#sec:Navigator__Package_Explorer__Project_Explorer">15.1.1.12. Navigator, Package Explorer, Project Explorer</a></li>
<li><a href="ui_concepts.html#sec:Hyperlinking_and_Navigation">15.1.1.13. Hyperlinking and Navigation</a></li>
<li><a href="ui_concepts.html#sec:Syntax_and_Semantic_Coloring">15.1.1.14. Syntax and Semantic Coloring</a></li>
<li><a href="ui_concepts.html#sec:Code_Formatter">15.1.1.15. Code Formatter</a></li>
<li><a href="ui_concepts.html#sec:Wizards">15.1.1.16. Wizards</a></li>
<li><a href="ui_concepts.html#sec:Cheat_Sheets">15.1.1.17. Cheat Sheets</a></li>
<li><a href="ui_concepts.html#sec:Context_sensitive_Help">15.1.1.18. Context-sensitive Help</a></li>
<li><a href="ui_concepts.html#sec:Hovers">15.1.1.19. Hovers</a></li>
<li><a href="ui_concepts.html#sec:Folding">15.1.1.20. Folding</a></li>
<li><a href="ui_concepts.html#sec:Customizable_validation___severity">15.1.1.21. Customizable validation / severity</a></li>
<li><a href="ui_concepts.html#sec:Proposals">15.1.1.22. Proposals</a></li>
</ul>
</li>
<li><a href="ui_concepts.html#sec:Non_Eclipse_UI_Concepts">15.1.2. Non-Eclipse UI Concepts</a>
<ul class="sectlevel4">
<li><a href="ui_concepts.html#sec:Overlays">15.1.2.1. Overlays</a></li>
<li><a href="ui_concepts.html#sec:Goto__Inferred__Type">15.1.2.2. Goto (Inferred) Type</a></li>
<li><a href="ui_concepts.html#sec:Postfix_Completion">15.1.2.3. Postfix Completion</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="ui_concepts.html#_user-interface-resources">15.2. User Interface Resources</a>
<ul class="sectlevel3">
<li><a href="ui_concepts.html#_icons">15.2.1. Icons</a>
<ul class="sectlevel4">
<li><a href="ui_concepts.html#_eclipse-platform-icons">15.2.1.1. Eclipse Platform Icons</a></li>
<li><a href="ui_concepts.html#_n4js-specific-icons">15.2.1.2. N4JS Specific Icons</a></li>
<li><a href="ui_concepts.html#_high-resolution-icons">15.2.1.3. High Resolution Icons</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><a href="formatting.html#_formatting">16. Formatting</a>
<ul class="sectlevel2">
<li><a href="formatting.html#sec:FmtObjective">16.1. Objective</a>
<ul class="sectlevel3">
<li><a href="formatting.html#sec:FmtFormatting_Comments">16.1.1. Formatting Comments</a></li>
</ul>
</li>
<li><a href="formatting.html#sec:FmtArchitecture">16.2. Architecture</a>
<ul class="sectlevel3">
<li><a href="formatting.html#sec:Implementation_example">16.2.1. Implementation example</a></li>
</ul>
</li>
<li><a href="formatting.html#sec:FmtFormatter_Implementation_Guidelines">16.3. Formatter Implementation Guidelines</a></li>
<li><a href="formatting.html#sec:FmtConfiguration">16.4. Configuration</a></li>
<li><a href="formatting.html#sec:FmtUI_Integration">16.5. UI Integration</a></li>
<li><a href="formatting.html#sec:FmtUnit_Testing_with_Xpect">16.6. Unit Testing with Xpect</a></li>
</ul>
</li>
<li><a href="#_external-libraries">17. External Libraries</a>
<ul class="sectlevel2">
<li><a href="#sec:Major_Components">17.1. Major Components</a>
<ul class="sectlevel3">
<li><a href="#subsec:External_Resources">17.1.1. External Resources</a></li>
<li><a href="#subsec:External_Library_Workspace">17.1.2. External Library Workspace</a></li>
<li><a href="#subsec:External_Library_Preference_Store">17.1.3. External Library Preference Store</a></li>
<li><a href="#subsec:npm_Manager">17.1.4. Library Manager</a></li>
<li><a href="#subsec:External_Library_Builder_Helper">17.1.5. External Library Builder</a></li>
<li><a href="#subsec:External_Library_Xtext_Index_Persister">17.1.6. External Library Xtext Index Persister</a></li>
<li><a href="#subsec:External_Library_Preference_Page">17.1.7. External Library Preference Page</a></li>
</ul>
</li>
<li><a href="#sec:Headless_External_Library_Support">17.2. Headless External Library Support</a>
<ul class="sectlevel3">
<li><a href="#_custom-npm-settings">17.2.1. Custom npm settings</a></li>
</ul>
</li>
<li><a href="#sec:lmFutureWork">17.3. Future Work</a>
<ul class="sectlevel3">
<li><a href="#subsec:lmMultipleDependencyScope">17.3.1. Multiple Dependency Scope</a></li>
<li><a href="#subsec:lmRunTestsFromLibrary">17.3.2. Run Tests from TestLibrary</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="json_support.html#sec:JSON_Support">18. JSON Support</a>
<ul class="sectlevel2">
<li><a href="json_support.html#sec:JSON_Parser">18.1. JSON Parser</a>
<ul class="sectlevel3">
<li><a href="json_support.html#sec:JSON_Parser_Unicode_Escaping">18.1.1. Escaping Unicode Control Characters in String Literals</a></li>
<li><a href="json_support.html#sec:JSON_Parser_Empty_Text">18.1.2. Empty Text</a></li>
<li><a href="json_support.html#sec:JSON_Parser_Nested_Structures">18.1.3. Nested Structures</a></li>
<li><a href="json_support.html#sec:JSON_Parser_Whitespace">18.1.4. Whitespace</a></li>
<li><a href="json_support.html#sec:JSON_Parser_Comments">18.1.5. Comments</a></li>
</ul>
</li>
<li><a href="json_support.html#sec:JSON_Language_Extensions">18.2. JSON Language Extensions</a>
<ul class="sectlevel3">
<li><a href="json_support.html#sec:JSON_Validator_Extensions">18.2.1. JSON Validator Extensions</a>
<ul class="sectlevel4">
<li><a href="json_support.html#sec:File_Specitic_Validator_Extensions">18.2.1.1. File-Specific Validator Extensions</a></li>
<li><a href="json_support.html#sec:JSON_Declarative_JSON_Validator_Extensions">18.2.1.2. Declarative JSON Validator Extensions</a></li>
</ul>
</li>
<li><a href="json_support.html#_json-resource-description-strategy">18.2.2. JSON Resource Description Strategy</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="jsdoc.html#_jsdoc">19. JSDoc</a>
<ul class="sectlevel2">
<li><a href="jsdoc.html#sec:Design_Rationale">19.1. Design Rationale</a>
<ul class="sectlevel3">
<li><a href="jsdoc.html#_general-design">19.1.1. General Design</a></li>
<li><a href="jsdoc.html#sec:Type_Expressions">19.1.2. Type Expressions</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="docexporter.html#_docexporter">20. DocExporter</a>
<ul class="sectlevel2">
<li><a href="docexporter.html#sec:Specification_Exporter">20.1. Specification Exporter</a></li>
</ul>
</li>
<li><a href="rename_refactoring.html#_rename-refactoring">21. Rename Refactoring</a>
<ul class="sectlevel2">
<li><a href="rename_refactoring.html#_rename-refactoring-ui-interaction">21.1. Rename Refactoring UI interaction</a></li>
<li><a href="rename_refactoring.html#_renameelementprocessor-interaction">21.2. RenameElementProcessor interaction</a></li>
</ul>
</li>
<li><a href="flow_graphs.html#chap:flowgraphs">22. Flow Graphs</a>
<ul class="sectlevel2">
<li><a href="flow_graphs.html#sec:flowgraphs_overview">22.1. Flow graphs overview</a>
<ul class="sectlevel3">
<li><a href="flow_graphs.html#_internal-graph">22.1.1. Internal graph</a></li>
<li><a href="flow_graphs.html#_optimizations">22.1.2. Optimizations</a></li>
<li><a href="flow_graphs.html#_api-for-client-analyses">22.1.3. API for client analyses</a>
<ul class="sectlevel4">
<li><a href="flow_graphs.html#_mapping-from-internal-to-ast-elements">22.1.3.1. Mapping from internal to AST elements</a></li>
<li><a href="flow_graphs.html#_graph-visitor">22.1.3.2. Graph visitor</a></li>
<li><a href="flow_graphs.html#_graph-explorer">22.1.3.3. Graph explorer</a></li>
<li><a href="flow_graphs.html#_branch-walker">22.1.3.4. Branch walker</a></li>
<li><a href="flow_graphs.html#_example-1-compute-string-for-each-path">22.1.3.5. Example 1: Compute string for each path</a></li>
<li><a href="flow_graphs.html#_path-quantor">22.1.3.6. Path quantor</a></li>
</ul>
</li>
<li><a href="flow_graphs.html#_control-flow-analyses">22.1.4. Control flow analyses</a>
<ul class="sectlevel4">
<li><a href="flow_graphs.html#_dead-code-analysis">22.1.4.1. Dead code analysis</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="flow_graphs.html#sec:dataflow">22.2. Dataflow</a>
<ul class="sectlevel3">
<li><a href="flow_graphs.html#_dataflow-graph">22.2.1. Dataflow graph</a></li>
<li><a href="flow_graphs.html#_dataflow-analyses">22.2.2. Dataflow analyses</a>
<ul class="sectlevel4">
<li><a href="flow_graphs.html#_def-def-def-nothing-analysis">22.2.2.1. Def&#8594;Def / Def&#8594;Nothing analysis</a></li>
<li><a href="flow_graphs.html#_def-use-decl-analysis">22.2.2.2. Def|Use&#8592;Decl analysis</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li><a href="publish_npms.html#sec:publish-npms-to-public">23. Publish npms</a>
<ul class="sectlevel2">
<li><a href="publish_npms.html#sec:publish-npms-n4js-maven">23.1. Publish n4js-libs to during maven build</a></li>
</ul>
</li>
<li><a href="appendix_a_hints.html#sec:Hints">Appendix A: Hints</a>
<ul class="sectlevel2">
<li><a href="appendix_a_hints.html#sec:XtextInjection">A.1. Xtext Injection</a>
<ul class="sectlevel3">
<li><a href="appendix_a_hints.html#sec:DI_MultipleInjectors_Singletons">A.1.1. Multiple Injectors and Singletons</a>
<ul class="sectlevel4">
<li><a href="appendix_a_hints.html#sec:DI_avoid_duplicate_singletons">A.1.1.1. Avoiding duplicate singletons</a>
<ul class="sectlevel5">
<li><a href="appendix_a_hints.html#sec:DI_binding_in_shared">A.1.1.1.1. Defining binding in the shared injector</a></li>
<li><a href="appendix_a_hints.html#sec:DI_binding_in_custom">A.1.1.1.2. Defining binding in the custom injector</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="appendix_a_hints.html#sec:DI_Hints">A.1.2. Dependency Injection Hints</a>
<ul class="sectlevel4">
<li><a href="appendix_a_hints.html#sec:DI_custom_bundle">A.1.2.1. Use DI in custom bundle, use DI with extensions</a>
<ul class="sectlevel5">
<li><a href="appendix_a_hints.html#sec:DI_custom_bundle_problem">A.1.2.1.1. Problem</a></li>
<li><a href="appendix_a_hints.html#sec:DI_custom_bundle_solution">A.1.2.1.2. Solution</a></li>
</ul>
</li>
<li><a href="appendix_a_hints.html#sec:Access_Other_DSL_Injector">A.1.2.2. How do I get the Guice Injector of my language?</a>
<ul class="sectlevel5">
<li><a href="appendix_a_hints.html#sec:DSL_Injector_UI_context">A.1.2.2.1. UI context</a></li>
<li><a href="appendix_a_hints.html#sec:DSL_Injector_Non_UI_context">A.1.2.2.2. Non UI context but with injection context</a></li>
<li><a href="appendix_a_hints.html#sec:DSL_Injector_Non_UI_non_injection_context">A.1.2.2.3. Non UI context without injection context</a></li>
</ul>
</li>
<li><a href="appendix_a_hints.html#sec:Cancel_Indicator">A.1.2.3. How do I get cancel indicators in different contexts?</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="appendix_a_hints.html#sec:Eclipse">A.2. Eclipse</a>
<ul class="sectlevel3">
<li><a href="appendix_a_hints.html#sec:Show_Xtext_Index">A.2.1. Show the current Xtext index</a></li>
<li><a href="appendix_a_hints.html#sec:Plugin_spy">A.2.2. Plug-in spy</a></li>
</ul>
</li>
<li><a href="appendix_a_hints.html#sec:Maven-hints">A.3. Maven</a>
<ul class="sectlevel3">
<li><a href="appendix_a_hints.html#how-to-check-for-maven-mojo-updates">A.3.1. How to check for Maven MOJO updates</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#_module-loading">Appendix B: Module Loading</a>
<ul class="sectlevel2">
<li><a href="appendix_b_module_loading.html#sec:Dependency_Management">B.1. Dependency Management</a></li>
<li><a href="appendix_b_module_loading.html#ecmascript-modules">B.2. ECMAScript Modules</a>
<ul class="sectlevel3">
<li><a href="appendix_b_module_loading.html#sec:ES5_Modules_Systems">B.2.1. ES5 Modules Systems</a></li>
<li><a href="appendix_b_module_loading.html#sec:ES6_Modules">B.2.2. ES6 Modules</a></li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#sec:ECMAScript_Module_Loaders">B.3. ECMAScript Module Loaders</a>
<ul class="sectlevel3">
<li><a href="appendix_b_module_loading.html#sec:ES6_Module_Loaders">B.3.1. ES6 Module Loaders</a></li>
<li><a href="appendix_b_module_loading.html#sec:Polyfills_for_ES6_Module_Loaders">B.3.2. Polyfills for ES6 Module Loaders</a>
<ul class="sectlevel4">
<li><a href="appendix_b_module_loading.html#sec:es6_module_loader">B.3.2.1. es6-module-loader</a></li>
<li><a href="appendix_b_module_loading.html#sec:SystemJS">B.3.2.2. SystemJS</a></li>
<li><a href="appendix_b_module_loading.html#sec:Demo">B.3.2.3. Demo</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#case-study-typescript">B.4. Case Study : TypeScript</a>
<ul class="sectlevel3">
<li><a href="appendix_b_module_loading.html#sec:ES6_Modules_Support">B.4.1. ES6 Modules Support</a></li>
<li><a href="appendix_b_module_loading.html#sec:TypeScript_and_Module_Loading">B.4.2. TypeScript and Module Loading</a></li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#sec:Cyclic_Dependencies">B.5. Cyclic Dependencies</a>
<ul class="sectlevel3">
<li><a href="appendix_b_module_loading.html#sec:Setup">B.5.1. Setup</a></li>
<li><a href="appendix_b_module_loading.html#sec:Transpile_and_Execute">B.5.2. Transpile and Execute</a>
<ul class="sectlevel4">
<li><a href="appendix_b_module_loading.html#sec:Module_Format___AMD">B.5.2.1. Module Format = AMD</a></li>
<li><a href="appendix_b_module_loading.html#sec:Module_Format___CommonJS">B.5.2.2. Module Format = CommonJS</a></li>
<li><a href="appendix_b_module_loading.html#sec:Module_Format___SystemJS">B.5.2.3. Module Format = SystemJS</a></li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#sec:Conclusion">B.5.3. Conclusion</a></li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#system.register-as-transpilation-target">B.6. System.register as transpilation target</a>
<ul class="sectlevel3">
<li><a href="appendix_b_module_loading.html#sec:Introduction">B.6.1. Introduction</a>
<ul class="sectlevel4">
<li><a href="appendix_b_module_loading.html#sec:External_Transpilers">B.6.1.1. External Transpilers</a></li>
<li><a href="appendix_b_module_loading.html#sec:Example_of_a_System_register_module">B.6.1.2. Example of a System.register module</a></li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#sec:Structure_of_a_System_register_module">B.6.2. Structure of a System.register module</a></li>
<li><a href="appendix_b_module_loading.html#_transpilation-hints">B.6.3. Transpilation Hints</a>
<ul class="sectlevel4">
<li><a href="appendix_b_module_loading.html#sec:Handling_Imports">B.6.3.1. Handling Imports</a></li>
<li><a href="appendix_b_module_loading.html#sec:__exportFn__">B.6.3.2. &lt;&lt;exportFn&gt;&gt;</a></li>
<li><a href="appendix_b_module_loading.html#sec:Handling_Exports">B.6.3.3. Handling Exports</a></li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#sec:Examples_w__Circular_Dependencies">B.6.4. Examples w/ Circular Dependencies</a></li>
<li><a href="appendix_b_module_loading.html#sec:N4JS_Examples_w__Circular_Dependencies">B.6.5. N4JS Examples w/ Circular Dependencies</a>
<ul class="sectlevel4">
<li><a href="appendix_b_module_loading.html#sec:Unresolved_Cyclic_Dependencies">B.6.5.1. Unresolved Cyclic Dependencies</a></li>
<li><a href="appendix_b_module_loading.html#sec:Variables___Functions">B.6.5.2. Examples with Variables &amp; Functions</a></li>
<li><a href="appendix_b_module_loading.html#sec:Classes">B.6.5.3. Examples with Classes</a></li>
<li><a href="appendix_b_module_loading.html#sec:Examples_with_SubClassing">B.6.5.4. Examples with SubClassing</a></li>
<li><a href="appendix_b_module_loading.html#sec:Miscellaneous">B.6.5.5. Miscellaneous</a></li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#_resources">B.6.6. Resources</a></li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#sec:CommonJS_as_transpilation_target">B.7. CommonJS as transpilation target</a>
<ul class="sectlevel3">
<li><a href="appendix_b_module_loading.html#_introduction-2">B.7.1. Introduction</a></li>
<li><a href="appendix_b_module_loading.html#sec:Transpilation_Hints">B.7.2. Transpilation Hints</a>
<ul class="sectlevel4">
<li><a href="appendix_b_module_loading.html#sec:Import_Statements">B.7.2.1. Import Statements</a></li>
<li><a href="appendix_b_module_loading.html#sec:Export_Statements">B.7.2.2. Export Statements</a></li>
<li><a href="appendix_b_module_loading.html#sec:Tracking_Live_Bindings">B.7.2.3. Tracking Live Bindings</a></li>
<li><a href="appendix_b_module_loading.html#sec:A_complete_example">B.7.2.4. A complete example</a></li>
</ul>
</li>
<li><a href="appendix_b_module_loading.html#_resources-2">B.7.3. Resources</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="appendix_c_license.html#sec:License">Appendix C: License</a></li>
<li><a href="appendix_d_acronyms.html#sec:Acronyms">Appendix D: Acronyms</a></li>
<li><a href="appendix_e_bibliography_and_footnotes.html#_bibliography-and-footnotes">Appendix E: Bibliography and Footnotes</a></li>
</ul>
</div>
</div>
<div id="content"><div class="sect1">
<h2 id="_external-libraries"><a class="anchor" href="#_external-libraries"></a><a class="link" href="#_external-libraries">17. External Libraries</a></h2>
<div class="sectionbody">
<div class="paragraph">
<p></p>
</div>
<div class="sidebarblock">
<div class="content">
<a href="https://github.com/eclipse/n4js/issues/1018" class="gray" title="GitHub Issues"><span class="image"><img src="images/issue.svg" alt=""></span> #1018</a>
<a href="https://github.com/eclipse/n4js/issues/397" class="gray" title="GitHub Issues"><span class="image"><img src="images/issue.svg" alt=""></span> #397</a>
<a href="https://github.com/eclipse/n4js/issues/809" class="gray" title="GitHub Issues"><span class="image"><img src="images/issue.svg" alt=""></span> #809</a>
<a href="https://github.com/eclipse/n4js/issues/714" class="gray" title="GitHub Issues"><span class="image"><img src="images/issue.svg" alt=""></span> #714</a>
<a href="https://github.com/eclipse/n4js/issues/653" class="gray" title="GitHub Issues"><span class="image"><img src="images/issue.svg" alt=""></span> #653</a>
<a href="https://github.com/eclipse/n4js/issues/862" class="gray" title="GitHub Issues"><span class="image"><img src="images/issue.svg" alt=""></span> #862</a>
<a href="https://github.com/eclipse/n4js/issues/1133" class="gray" title="GitHub Issues"><span class="image"><img src="images/issue.svg" alt=""></span> #1133</a>
</div>
</div>
<div class="paragraph">
<p><strong>External libraries</strong> are N4JS projects that are provided by the N4JS IDE:
the <em>built-in</em>/<em>shipped</em> libraries, and all <em>3rd-party libraries</em> that were installed by the <em>N4JS library manager</em>.
Each external library consist of a valid package.json file located in the project root and an arbitrary number of files supported by N4JS projects, e.g. <em>.n4js</em>, <em>.njsd</em> and <em>.js</em> files.
The purpose of the external libraries is to share and to provide core and third party functionality for N4JS developers both in compile and runtime without rebuilding them.</p>
</div>
<div class="paragraph">
<p><a href="#sec:Built-in_External_Libraries">[sec:Built-in_External_Libraries]</a> are external libraries that provide some basic functionality for N4JS programmers, such as the class <code>N4Injector</code>.</p>
</div>
<div class="paragraph">
<p><strong>3rd-party libraries</strong> are external libraries that are not built-in/shipped with the N4JS IDE.
Instead, they can be installed later by the user from third party providers.
Currently, only <em>npm packages</em> are supported.</p>
</div>
<div class="paragraph">
<p>The <strong>N4JS index</strong> is populated when the external libraries are compiled.
However, this compilation is only triggered through the library manager, but not when building workspace projects. (Self-evidently, the index is also populated when compiling workspace projects.)</p>
</div>
<div class="paragraph">
<p><strong>Name clashes</strong> of projects can happen and they are solved in the following order:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>User workspace projects always shadow external libraries.</p>
</li>
<li>
<p>In case of a name clash between a shipped and a 3rd-party library, the 3rd-party library shadows the shipped project.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>The <strong>N4JS library manager</strong> is a tool in the N4JS IDE to view and manage external libraries.
In particular, the user can (un-)install new 3rd-party libraries, or can trigger the build of all external libraries to re-populate the N4JS index.
The library manager also supports other maintenance actions such as deleting all 3rd-party libraries.</p>
</div>
<div class="sect2 language-n4js">
<h3 id="sec:Major_Components"><a class="anchor" href="#sec:Major_Components"></a><a class="link" href="#sec:Major_Components">17.1. Major Components</a></h3>
<div class="paragraph">
<p>External libraries are supported based on different components all over the application.</p>
</div>
<div class="paragraph">
<p>The followings are the most important ones:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><strong>External Resources</strong> (<code>IExternalResource</code>)</p>
<div class="ulist">
<ul>
<li>
<p>These are customized <code>IResource</code> implementations for external projects, folders and files.</p>
</li>
<li>
<p>With this approach the <code>IProject</code>, <code>IFolder</code> and <code>IFile</code> interfaces have been implemented. Each implementation is backed by a pure <code>java.io.File</code> based resource.</p>
</li>
<li>
<p>When accessing such external resources for example visiting purposes, getting the members of the resource or simply deleting the resource, internally each requests will be directly performed on the wrapped <code>java.io.File</code> without accessing the <code>org.eclipse.core.resources.IWorkspace</code> instance.</p>
</li>
</ul>
</div>
</li>
<li>
<p><strong>External Library Workspace</strong></p>
<div class="ulist">
<ul>
<li>
<p>This is a kind of dedicated workspace for external libraries and their dependencies.</p>
</li>
<li>
<p>Any query requests to retrieve a particular project or any dependencies of a particular project via the <code>IN4JSCore</code> singleton service will delegated to its wrapped <code>N4JSModel</code> singleton. Internally the <code>N4JSModel</code> has a reference to a workspace for all the ordinary workspace projects and another reference to the workspace for external libraries. Each query requests will be forwarded to the workspace for the ordinary projects first, and then to the external library workspace. If ordinary project workspace can provide any meaningful response for a request, then the external library workspace will not be accessed at all. Otherwise the query will be executed against the external library workspace. This fallback mechanism provides a pragmatic solution to the project shadowing feature. The project shadowing will be described in details later in this section.</p>
</li>
<li>
<p>The <strong>External Library Workspace</strong> is only supported and available in the IDE case, in the headless case there are no external libraries available from this dedicated workspace. Since the Xtext index creation and the entire build infrastructure is different, it is supported via target platform file. This is described in more details in a later section (<a href="#sec:Headless_External_Library_Support">Headless External Library Support</a>]).</p>
</li>
</ul>
</div>
</li>
<li>
<p><strong>External Library Preference Store</strong></p>
<div class="ulist">
<ul>
<li>
<p>This preference store is being used to register and un-register external library root folders into its underlying ordered list. A folder is called as an external library root folder if it is neither equal with the Eclipse workspace root nor being nested in the workspace root and contains zero to any external libraries.</p>
</li>
<li>
<p>Whenever any modifications are being saved in this preference store the <em>External Library Workspace</em> will be updated as well, new libraries will be registered into the workspace and removed libraries will be cleaned up from the workspace.</p>
</li>
<li>
<p>When the N4JS IDE application is started in production mode, the initial state of the preference store is being pre-populated with default values. This is necessary to provide built-in libraries to end users. These default values and additional advanced configurations will be mentioned in more details later in this section.</p>
</li>
</ul>
</div>
</li>
<li>
<p><strong>Library Manager</strong></p>
<div class="ulist">
<ul>
<li>
<p>This service is responsible for downloading and installing third party <em>npm</em> packages into the <code>node_modules</code> folder of the N4JS IDE. After downloading, the newly-installed and/or updated packages are registered as external libraries into the system.</p>
</li>
</ul>
</div>
</li>
<li>
<p><strong>External Library Builder</strong></p>
<div class="ulist">
<ul>
<li>
<p>This service is responsible for updating the persistent Xtext index with the currently available external libraries.</p>
</li>
<li>
<p>Unlike in case of any other ordinary projects, this builder does not triggers a build via the <code>org.eclipse.core.internal.events.BuildManager</code> but modifies the persisted Xtext index (<code>IBuilderState</code>) directly.</p>
</li>
<li>
<p>Considers shadowed external libraries when updating the persisted Xtext index.</p>
</li>
<li>
<p>Makes sure that the external library related Xtext index is persistent and will be available on the next application startup.</p>
</li>
</ul>
</div>
</li>
<li>
<p><strong>External Library Xtext Index Persister</strong></p>
<div class="ulist">
<ul>
<li>
<p>This class is responsible for recovering the consistent external library Xtext index state at application startup.</p>
</li>
<li>
<p>Scheduled on the very first application startup to prepare the Xtext index for the available external libraries.</p>
</li>
<li>
<p>Recovers the Xtext index state after a force quit and/or application crash.</p>
</li>
</ul>
</div>
</li>
<li>
<p><strong>External Library Preference Page</strong></p>
<div class="ulist">
<ul>
<li>
<p>Preference page to configure and update the state of the <em>External Library Preference Store</em>.</p>
</li>
<li>
<p>Provides a way to install <em>npm</em> dependencies as external libraries into the application.</p>
</li>
<li>
<p>Reloads the external libraries. Gets the most recent state of N4JS type definition files and updates the Xtext index content based on the current state of the external libraries.</p>
</li>
<li>
<p>Exports the current npm dependency configuration as a target platform file. This will be discussed in another section ([sec:Headless_External_Library_Support]).</p>
</li>
</ul>
</div>
</li>
<li>
<p><strong>Miscellaneous UI Features</strong></p>
<div class="ulist">
<ul>
<li>
<p>Searching for types provided by external libraries.</p>
</li>
<li>
<p>Opening external modules in read-only editor.</p>
</li>
<li>
<p>Navigation between external types.</p>
</li>
<li>
<p><em>Project Explorer</em> contribution for showing external dependencies for ordinary workspace projects.</p>
</li>
<li>
<p>Editor-navigator linking support for external modules.</p>
</li>
<li>
<p>Installing third party npm dependencies directly from package.json editor via a quick fix.</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
<div class="sect3">
<h4 id="subsec:External_Resources"><a class="anchor" href="#subsec:External_Resources"></a><a class="link" href="#subsec:External_Resources">17.1.1. External Resources</a></h4>
<div class="paragraph">
<p>This approach provides a very pragmatic and simple solution to support external libraries in both in the <code>IN4JSCore</code> and in the <code>IBuilderState</code>. While <code>IN4JSCore</code> supports a completely transparent way of external libraries via the <code>IN4JSProject</code> interface all over in the application, the <code>IBuilderState</code> is responsible for keeping the Xtext index content up to date with the external libraries. Below picture depicts the hierarchy between the ordinary <code>IResource</code> and the <code>IExternalResource</code> instances. As described above each external resource is backed by a <code>java.io.File</code> resource and each access and operation being invoked on the <code>IResource</code> interface will be delegated to this backing resource.</p>
</div>
<div id="fig:External_Resources_Hierarchy" class="imageblock center">
<div class="content">
<img src="chapters/20_externalLibraries/images/externalResources.svg" alt="externalResources">
</div>
<div class="title">Figure 48. External Resources Hierarchy</div>
</div>
</div>
<div class="sect3">
<h4 id="subsec:External_Library_Workspace"><a class="anchor" href="#subsec:External_Library_Workspace"></a><a class="link" href="#subsec:External_Library_Workspace">17.1.2. External Library Workspace</a></h4>
<div class="paragraph">
<p>External library workspace is an extension of the <code>InternalN4JSWorkspace</code>. This workspace is used for storing and managing external libraries all over the application. External libraries can be registered into the workspace by providing one to many external library root folder locations. The provided root folder locations will be visited in an ordered fashion and the contained external libraries (N4JS projects) will be registered into the application. If an external library from a root folder has been registered, then a forthcoming occurrence of an external library with the same artefact identifier (and same folder name) will be ignored at all. For instance let assume two external library root locations are available <code>ER1</code> and <code>ER2</code>, also <code>ER1</code> contains <code>P1</code> and <code>P2</code> external libraries, while <code>ER2</code> contains <code>P2</code> and <code>P3</code>. After registering the two roots into the workspace <code>ER1</code> will be processed first, and <code>P1</code> and <code>P2</code> will be registered to the workspace, when processing the forthcoming <code>ER2</code> root, <code>P2</code> will be ignored at all as an external with the same name exists. Finally <code>P3</code> will be registered to the workspace. External libraries cannot be registered directly into the workspace it is done automatically by the <em>External Library Preference Store</em> and by the <em>npm Manager</em>.</p>
</div>
</div>
<div class="sect3">
<h4 id="subsec:External_Library_Preference_Store"><a class="anchor" href="#subsec:External_Library_Preference_Store"></a><a class="link" href="#subsec:External_Library_Preference_Store">17.1.3. External Library Preference Store</a></h4>
<div class="paragraph">
<p>This persistent cache is used for storing an ordered enumeration of registered external library root folder locations. Whenever its internal state is being persisted after a modification, all registered modification listeners will be synchronously notified about this change. All listeners will receive the store itself with the updated state. There are a couple of registered listeners all over the application listening to store update events but the most important one is the <em>External Library Workspace</em> itself. After receiving an external library preference store update event, the external library workspace will calculate the changes from its own state: creates a sort of difference by identifying added, removed and modified external libraries. Also tracks external library root location order changes. Once the workspace has calculated the changes<sup class="footnote">[<a id="_footnoteref_18" class="footnote" href="appendix_e_bibliography_and_footnotes.html#_footnote_18" title="View footnote.">18</a>]</sup> it will interact with the <em>External Library Builder Helper</em> which will eventually update the persisted Xtext index directly through the <code>IBuilderState</code>. After the Xtext index content update all ordinary workspace projects that directly depend either on a built or a cleaned external library will be automatically rebuilt by the external library workspace.</p>
</div>
</div>
<div class="sect3">
<h4 id="subsec:npm_Manager"><a class="anchor" href="#subsec:npm_Manager"></a><a class="link" href="#subsec:npm_Manager">17.1.4. Library Manager</a></h4>
<div class="paragraph">
<p>This service is responsible for downloading, installing third party npm dependencies into the local file system. This is done directly by <code>npm</code> from <code>Node.js</code>. Once an npm package has been downloaded and installed it will be registered into the external library workspace. As part of the registration, the Xtext index content will be updated and all dependent ordinary workspace projects will be rebuilt automatically. An npm package cannot be installed via the <em>Library Manager</em> if it already installed previously.</p>
</div>
</div>
<div class="sect3">
<h4 id="subsec:External_Library_Builder_Helper"><a class="anchor" href="#subsec:External_Library_Builder_Helper"></a><a class="link" href="#subsec:External_Library_Builder_Helper">17.1.5. External Library Builder</a></h4>
<div class="paragraph">
<p>This builder is responsible for updating the persisted Xtext index state with external library content directly through the <code>IBuilderState</code>. When providing a subset of external libraries to either build or clean, internally it orders the provided external libraries based on the project dependencies. Also, it might skip building all those external libraries that have are being shadowed by a workspace counterpart. An external library is being shadowed by an ordinary workspace project, if the workspace project is accessible and has exactly the same project name as the external library.</p>
</div>
</div>
<div class="sect3">
<h4 id="subsec:External_Library_Xtext_Index_Persister"><a class="anchor" href="#subsec:External_Library_Xtext_Index_Persister"></a><a class="link" href="#subsec:External_Library_Xtext_Index_Persister">17.1.6. External Library Xtext Index Persister</a></h4>
<div class="paragraph">
<p>By default Xtext provides a way to fix corrupted index or to recreate it from scratch in case of its absence. Such inconsistent index states could occur due to application crashes or due to non-graceful application shutdowns. Although this default recovery mechanism provided by Xtext works properly, it is provided only for projects that are available in the Eclipse based workspace (<code>org.eclipse.core.resources.IWorkspace</code>) but non of the external libraries are not available from the Eclipse based workspace, so inconsistent external library index content cannot be recovered by this default mechanism. N4JS IDE contributes its own logic to recover index state of external N4JS libraries. When the default Xtext index recovery runs, then it will trigger a external reload as well. This external reload is guaranteed to run always after the default recovery mechanism.</p>
</div>
</div>
<div class="sect3">
<h4 id="subsec:External_Library_Preference_Page"><a class="anchor" href="#subsec:External_Library_Preference_Page"></a><a class="link" href="#subsec:External_Library_Preference_Page">17.1.7. External Library Preference Page</a></h4>
<div class="paragraph">
<p>This preference page provides a way to configure the external libraries by adding and removing external library root folders, also allows the user to reorder the configured external library root locations. Besides that, npm packages can be installed into the application as external libraries. Neither removing nor reordering built-in external libraries are supported, hence these operations are disabled for built-ins on the preference page. No modifications will take effect unless the changes are persisted with the <code>Apply</code> button. One can reset the configurations to the default state by clicking on the <code>Restore Defaults</code> button then on the <code>Apply</code> button. The <code>Reload</code> button will check whether new type definition files are available for npm dependencies, then reloads the persistent Xtext index content based on the available external libraries. Once the external library reloading has been successfully finished, all dependent workspace projects will be rebuilt as well. From the preference page one can export the installed and used third party npm packages as a target platform. This exported target platform file can be used with the headless compiler. After setting up the headless compiler with this exported target platform file, the headless tool will collect and download all required third party npm dependencies.</p>
</div>
</div>
</div>
<div class="sect2 language-n4js">
<h3 id="sec:Headless_External_Library_Support"><a class="anchor" href="#sec:Headless_External_Library_Support"></a><a class="link" href="#sec:Headless_External_Library_Support">17.2. Headless External Library Support</a></h3>
<div class="paragraph">
<p>The headless compiler is not capable of supporting built-in libraries. The whole build and Xtext index creation infrastructure is different in the IDE and in the headless case. Also, due to its archive nature (<code>n4jsc.jar</code>) of the headless tool, neither the runtime nor the <code>Mangelhaft</code> libraries can be loaded into the headless compiler.</p>
</div>
<div class="paragraph">
<p>The headless compiler supports downloading, installing and using third party <code>npm</code> packages. To enable this feature one has to configure the target platform via the <code>–targetPlatformFile</code> (or simply <code>-tp</code>) and the <code>–targetPlatformInstallLocation</code> (or simply <code>-tl</code>) arguments.</p>
</div>
<div class="paragraph">
<p>If the target platform file argument is configured, then all third party dependencies declared in the target platform file will be downloaded, installed and made available for all the N4JS projects before the compile (and run) phase. If the target platform file is given but the target platform install location is not specified (via the <code>–targetPlatformInstallLocation</code> argument), then a the compilation phase will be aborted and the execution will be interrupted.</p>
</div>
<div class="paragraph">
<p>For more convenient continuous integration and testing purposes there are a couple of additional exception cases with respect to the the target platform file and location that users of the headless compiler have to keep in mind. These are the followings:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>–targetPlatformSkipInstall</code>. Usually dependencies defined in the target platform file will be installed into the folder defined by option <code>–targetPlatformInstallLocation</code>. If this flag is provided, this installation will be skipped, assuming the given folder already contains the required files and everything is up-to-date. Users have to use this flag with care, because no checks will be performed whether the location actually contains all required dependencies.</p>
</li>
<li>
<p>If <code>–targetPlatformSkipInstall</code> is provided the <code>–targetPlatformInstallLocation</code> parameter is completely ignored.</p>
</li>
<li>
<p>If <code>–targetPlatformSkipInstall</code> is provided the <code>–targetPlatformFile</code> parameter is completely ignored.</p>
</li>
<li>
<p>If neither <code>–targetPlatformInstallLocation</code> not <code>–targetPlatformFile</code> parameters are specified the headless tool will treat this case as an implicit <code>–targetPlatformSkipInstall</code> configuration.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>If the target platform install location is configured, and the target platform file is given as well, then all third party dependencies specified in the target platform file will be downloaded to that given location. If the target platform file is given, but the target platform install location is not specified, then a the compilation phase will be aborted and the execution will be interrupted.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">java -jar n4jsc.jar -projectlocations /path/to/the/workspace/root -t allprojects -tp /absolute/path/to/the/file -tl /path/to/the/target/platform/install/location -rw nodejs -r moduleToRun</code></pre>
</div>
</div>
<div class="sect3">
<h4 id="_custom-npm-settings"><a class="anchor" href="#_custom-npm-settings"></a><a class="link" href="#_custom-npm-settings">17.2.1. Custom npm settings</a></h4>
<div class="paragraph">
<p>In some cases there is a need for custom npm settings, e.g. custom npm registry. Those kind of configurations are
supported via <code>.npmrc</code> file (see <a href="https://docs.npmjs.com/files/npmrc" class="bare">https://docs.npmjs.com/files/npmrc</a>).</p>
</div>
<div class="paragraph">
<p>In N4JSIDE user can specify path to his custom configuration file in the preference page.</p>
</div>
<div class="paragraph">
<p>For the commandline N4JSC.jar provides special option <code>-npmrcRootLocation</code> that allows headless compiler to
use custom settings.</p>
</div>
</div>
</div>
<div class="sect2">
<h3 id="sec:lmFutureWork"><a class="anchor" href="#sec:lmFutureWork"></a><a class="link" href="#sec:lmFutureWork">17.3. Future Work</a></h3>
<div class="paragraph">
<p>Some aspects not covered in current design, but worth consideration in the future</p>
</div>
<div class="sect3">
<h4 id="subsec:lmMultipleDependencyScope"><a class="anchor" href="#subsec:lmMultipleDependencyScope"></a><a class="link" href="#subsec:lmMultipleDependencyScope">17.3.1. Multiple Dependency Scope</a></h4>
<div class="paragraph">
<p>npm scope dependencies</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1"><strong>DEPENDENCY_DEVELOPMENT</strong> </dt>
<dd>
<p><a href="https://docs.npmjs.com/files/package.json#devdependencies" class="bare">https://docs.npmjs.com/files/package.json#devdependencies</a></p>
</dd>
<dt class="hdlist1"><strong>DEPENDENCY_PEER</strong> </dt>
<dd>
<p><a href="https://docs.npmjs.com/files/package.json#peerdependencies" class="bare">https://docs.npmjs.com/files/package.json#peerdependencies</a></p>
</dd>
<dt class="hdlist1"><strong>DEPENDENCY_BUNDLE</strong> </dt>
<dd>
<p><a href="https://docs.npmjs.com/files/package.json#bundleddependencies" class="bare">https://docs.npmjs.com/files/package.json#bundleddependencies</a></p>
</dd>
<dt class="hdlist1"><strong>DEPENDENCY_OPTIONAL</strong> </dt>
<dd>
<p><a href="https://docs.npmjs.com/files/package.json#optionaldependencies" class="bare">https://docs.npmjs.com/files/package.json#optionaldependencies</a></p>
</dd>
<dt class="hdlist1"><strong>DEPENDENCY_PROVIDES</strong> </dt>
<dd>
<p><a href="http://www.rpm.org/wiki/PackagerDocs/Dependencies#Provides" class="bare">http://www.rpm.org/wiki/PackagerDocs/Dependencies#Provides</a></p>
</dd>
<dt class="hdlist1"><strong>DEPENDENCY_WEAK</strong> </dt>
<dd>
<p><a href="http://www.rpm.org/wiki/PackagerDocs/Dependencies#Weakdependencies" class="bare">http://www.rpm.org/wiki/PackagerDocs/Dependencies#Weakdependencies</a></p>
</dd>
</dl>
</div>
</div>
<div class="sect3">
<h4 id="subsec:lmRunTestsFromLibrary"><a class="anchor" href="#subsec:lmRunTestsFromLibrary"></a><a class="link" href="#subsec:lmRunTestsFromLibrary">17.3.2. Run Tests from TestLibrary</a></h4>
<div class="paragraph">
<p>Imagine we are implementing some API, and we want to run tests for that API. Tests are delivered to us as separate package, and there is not direct association between implementation and test projects (tests are not depending on implementation). Still we want to run provided tests to see if our implementation complies with API tests, e.g. AcceptanceTest suite for Application written against application sdk.</p>
</div>
</div>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Version 0.9<br>
Last updated 2019-08-08 13:15:33 CEST
</div>
</div>
<!-- ************* docinfo-footer *************************************************************** -->
<div class="Grid social" style="color:#d5dfea">
<div class="Cell Cell--2-12 m-Cell--withMargin">
<h2>Quick Links</h2>
<ul>
<li><a href="../downloads.html">Download</a></li>
<li><a href="../userguides/index.html">Documentation</a></li>
<li><a href="https://github.com/eclipse/n4js/">Source</a></li>
<li><a href="https://github.com/eclipse/n4js/issues">Issues</a></li>
</ul>
</div>
<div class="Cell Cell--2-12 m-Cell--withMargin">
<br/><br/>
<ul>
<li><a href="https://www.eclipse.org/forums/index.php/f/365/">Forum</a></li>
<li><a href="http://n4js.blogspot.de/">Blog</a></li>
<li><a href="https://dev.eclipse.org/mailman/listinfo/n4js-dev">Mailing List</a></li>
<li><a href="https://projects.eclipse.org/projects/technology.n4js">Eclipse Project Page</a></li>
<li><a href="https://twitter.com/n4jsdev">Tweets by n4jsdev</a></li>
</ul>
</div>
<div class="Cell Cell--2-12 m-Cell--withMargin">
<br/><br/>
<ul>
<li><a href="http://www.eclipse.org/">Eclipse Home</a></li>
<li><a href="http://www.eclipse.org/legal/privacy.php">Privacy Policy</a></li>
<li><a href="http://www.eclipse.org/legal/termsofuse.php">Terms of Use</a></li>
<li><a href="http://www.eclipse.org/legal/copyright.php">Copyright Agent</a></li>
<li><a href="http://www.eclipse.org/legal/">Legal</a></li>
</ul>
</div>
<div style="clear: both; height: 0; overflow: hidden;"></div>
</div>
<!-- ************* UI Scripts ************* -->
<script type="text/javascript" src="scripts/back-to-top.js"></script>
<script type="text/javascript" src="scripts/treeview.js"></script>
<script type="text/javascript" src="scripts/toc.js"></script>
<!-- ************* Prism.js Syntax Highlighting ************* -->
<script src="scripts/prism.js"></script>
<script type="text/javascript">
// Add the 'toclist' id for search function
$(".toc2 > ul").attr('id', 'toclist');
// Generate a Search input form
$("#toclist > li:first-of-type").before('<input type="text" id="pagesearch" onkeyup="search()" placeholder="Search for section...">');
$("#toclist > li:first-of-type").before('<i id="clear" class="fa fa-times-circle-o"></i>');
$("#clear").click(function(){
$("#pagesearch").val('');
search();
$('.toc2 > ul').treeView('collapseAll');
});
// intialize Treeview.js
$(".toc2 > ul").treeView();
// Initialize Scrollspy
</script>
<!-- ************* docinfo-footer *************************************************************** -->
</body>
</html>