FeatureSet (Closure Compiler v20161024 API)

java.lang.Object
- com.google.javascript.jscomp.parsing.parser.FeatureSet

All Implemented Interfaces:

Serializable
```
public final class FeatureSet
extends Object
implements Serializable
```
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.
Instances of this class are immutable.

See Also:
Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class FeatureSet.Feature
Specific features that can be included (indirectly) in a FeatureSet.

Nested Classes
Modifier and Type	Class and Description
`static class`	`FeatureSet.Feature` Specific features that can be included (indirectly) in a FeatureSet.

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`	`ES7`
`static FeatureSet`	`ES7_MODULES`
`static FeatureSet`	`ES8`
`static FeatureSet`	`ES8_MODULES`
`static FeatureSet`	`TYPESCRIPT` TypeScript syntax.

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`contains(FeatureSet.Feature feature)` Does this `FeatureSet` include `feature`?
`boolean`	`contains(FeatureSet other)` Does this `FeatureSet` contain all of the features of `other`?
`boolean`	`equals(Object other)`
`boolean`	`hasEs6Modules()` Returns whether this feature set includes ES6 modules.
`int`	`hashCode()`
`boolean`	`isEs6ImplOrHigher()`
`boolean`	`isTypeScript()` Returns whether this feature set includes typescript features.
`FeatureSet`	`require(FeatureSet.Feature feature)` Returns a feature set combining all the features from `this` and `feature`.
`FeatureSet`	`require(FeatureSet other)` Returns a feature set combining all the features from `this` and `other`.
`String`	`toLanguageModeString()` Returns a the name of a corresponding LanguageMode enum element.
`String`	`toString()`
`FeatureSet`	`union(FeatureSet other)` Returns a new `FeatureSet` including all features of both `this` and `other`.
`static FeatureSet`	`valueOf(String name)` Parses known strings into feature sets.
`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, 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.
  - ES7
```
public static final FeatureSet ES7
```
  - ES7_MODULES
```
public static final FeatureSet ES7_MODULES
```
  - ES8
```
public static final FeatureSet ES8
```
  - ES8_MODULES
```
public static final FeatureSet ES8_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.
  - union
```
public FeatureSet union(FeatureSet other)
```
    Returns a new FeatureSet including all features of both this and other.
  - contains
```
public boolean contains(FeatureSet other)
```
    Does this FeatureSet contain all of the features of other?
  - require
```
public FeatureSet require(FeatureSet.Feature feature)
```
    Returns a feature set combining all the features from this and feature.
  - contains
```
public boolean contains(FeatureSet.Feature feature)
```
    Does this FeatureSet include feature?
  - equals
```
public boolean equals(Object other)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - toLanguageModeString
```
public String toLanguageModeString()
```
    Returns a the name of a corresponding LanguageMode enum element.
  - valueOf
```
public static FeatureSet valueOf(String name)
```
    Parses known strings into feature sets.
  - isEs6ImplOrHigher
```
public boolean isEs6ImplOrHigher()
```

Class FeatureSet

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ES3

ES5

ES6_IMPL

ES6

ES6_MODULES

ES7

ES7_MODULES

ES8

ES8_MODULES

TYPESCRIPT

Method Detail

version

hasEs6Modules

isTypeScript

require

union

contains

require

contains

equals

hashCode

toString

toLanguageModeString

valueOf

isEs6ImplOrHigher