com.google.javascript.jscomp.parsing.parser

Class FeatureSet

java.lang.Object

com.google.javascript.jscomp.parsing.parser.FeatureSet

public final class FeatureSet
extends Object

Represents various aspects of language version and support. This is somewhat redundant with LanguageMode, but is separate for two reasons: (1) it's used for parsing, which cannot depend on LanguageMode, and (2) it's concerned with slightly different nuances: implemented features and modules rather than strictness.

In the long term, it would be good to disentangle all these concerns and pull out a single LanguageSyntax enum with a separate strict mode flag, and then these could possibly be unified.

Field Summary

Fields

Modifier and Type	Field and Description
static FeatureSet	ES3 The bare minimum set of features in ES3.
static FeatureSet	ES5 Features from ES5 only.
static FeatureSet	ES6 The full set of ES6 features, not including modules.
static FeatureSet	ES6_IMPL The subset of ES6 features that are implemented in stable Chrome, Firefox, and Edge.
static FeatureSet	ES6_MODULES All ES6 features, including modules.
static FeatureSet	TYPESCRIPT TypeScript syntax.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object other)
boolean	hasEs6Modules() Returns whether this feature set includes ES6 modules.
int	hashCode()
boolean	isTypeScript() Returns whether this feature set includes typescript features.
FeatureSet	require(FeatureSet other) Returns a feature set combining all the features from this and other.
String	version() Returns a string representation suitable for encoding in depgraph and deps.js files.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail

ES3

public static final FeatureSet ES3

The bare minimum set of features in ES3.

ES5

public static final FeatureSet ES5

Features from ES5 only.

ES6_IMPL

public static final FeatureSet ES6_IMPL

The subset of ES6 features that are implemented in stable Chrome, Firefox, and Edge.

ES6

public static final FeatureSet ES6

The full set of ES6 features, not including modules.

ES6_MODULES

public static final FeatureSet ES6_MODULES

All ES6 features, including modules.

TYPESCRIPT

public static final FeatureSet TYPESCRIPT

TypeScript syntax.

Method Detail

version

public String version()

Returns a string representation suitable for encoding in depgraph and deps.js files.

hasEs6Modules

public boolean hasEs6Modules()

Returns whether this feature set includes ES6 modules.

isTypeScript

public boolean isTypeScript()

Returns whether this feature set includes typescript features.

require

public FeatureSet require(FeatureSet other)

Returns a feature set combining all the features from this and other.

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object