VoidType (Compiler)

java.lang.Object
- com.google.javascript.rhino.jstype.JSType
- - com.google.javascript.rhino.jstype.VoidType

All Implemented Interfaces:

Serializable
```
public class VoidType
extends JSType
```
Void type whose only element is the undefined value.

See Also:
Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class com.google.javascript.rhino.jstype.JSType
  JSType.TypePair

Field Summary
- Fields inherited from class com.google.javascript.rhino.jstype.JSType
  EMPTY_TYPE_COMPONENT, ENUMDECL, NOT_A_CLASS, NOT_A_TYPE, NOT_ENUMDECL, UNKNOWN_NAME

Method Summary

Methods
Modifier and Type	Method and Description
`String`	`getDisplayName()` Returns a user meaningful label for the JSType instance.
`BooleanLiteralSet`	`getPossibleToBooleanOutcomes()` Computes the set of possible outcomes of the `ToBoolean` predicate for this type.
`boolean`	`hasDisplayName()`
`boolean`	`isVoidType()`
`boolean`	`matchesNumberContext()` This predicate is used to test whether a given type can appear in a numeric context, such as an operand of a multiply operator.
`boolean`	`matchesObjectContext()` This predicate is used to test whether a given type can appear in an `Object` context, such as the expression in a with statement.
`boolean`	`matchesStringContext()` This predicate is used to test whether a given type can appear in a `String` context, such as an operand of a string concat (+) operator.
`JSType`	`restrictByNotNullOrUndefined()` If this is a union type, returns a union type that does not include the null or undefined type.
`TernaryValue`	`testForEquality(JSType that)` Compares `this` and `that`.
`<T> T`	`visit(Visitor<T> visitor)` Visit this type with the given visitor.

Methods inherited from class com.google.javascript.rhino.jstype.JSType
autobox, autoboxesTo, canBeCalled, canCastTo, canTestForEqualityWith, canTestForShallowEqualityWith, clearResolved, collapseUnion, dereference, differsFrom, equals, findPropertyType, forceResolve, getGreatestSubtype, getJSDocInfo, getLeastSupertype, getRestrictedTypeGivenToBooleanOutcome, getTemplateKeys, getTemplatizedType, getTemplatizedTypes, getTypesUnderEquality, getTypesUnderInequality, getTypesUnderShallowEquality, getTypesUnderShallowInequality, hasAnyTemplateTypes, hashCode, hasProperty, hasTemplatizedType, isAllType, isArrayType, isBooleanObjectType, isBooleanValueType, isCheckedUnknownType, isConstructor, isDateType, isDict, isEmptyType, isEnumElementType, isEnumType, isEquivalent, isEquivalentTo, isFunctionPrototypeType, isFunctionType, isGlobalThisType, isInstanceType, isInterface, isInvariant, isNominalConstructor, isNominalType, isNoObjectType, isNoResolvedType, isNoType, isNullable, isNullType, isNumber, isNumberObjectType, isNumberValueType, isObject, isOrdinaryFunction, isParameterizedType, isRecordType, isRegexpType, isResolved, isString, isStringObjectType, isStringValueType, isStruct, isSubtype, isTemplateType, isTemplatized, isUnionType, isUnknownType, matchConstraint, matchesInt32Context, matchesUint32Context, resolve, setValidator, toAnnotationString, toDebugHashCodeString, toMaybeEnumElementType, toMaybeEnumType, toMaybeFunctionType, toMaybeFunctionType, toMaybeParameterizedType, toMaybeParameterizedType, toMaybeTemplateType, toMaybeTemplateType, toMaybeUnionType, toObjectType, toString, unboxesTo

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Method Detail
  - restrictByNotNullOrUndefined
```
public JSType restrictByNotNullOrUndefined()
```
    Description copied from class: JSType
    
    If this is a union type, returns a union type that does not include the null or undefined type.
    
    Overrides:
    
    restrictByNotNullOrUndefined in class JSType
  - testForEquality
```
public TernaryValue testForEquality(JSType that)
```
    Description copied from class: JSType
    
    Compares this and that.
    Overrides:
    
    testForEquality in class JSType
    
    Returns:
    TernaryValue.TRUE if the comparison of values of this type and that always succeed (such as undefined compared to null)
    
    TernaryValue.FALSE if the comparison of values of this type and that always fails (such as undefined compared to number)
    
    TernaryValue.UNKNOWN if the comparison can succeed or fail depending on the concrete values
  - matchesNumberContext
```
public boolean matchesNumberContext()
```
    Description copied from class: JSType
    
    This predicate is used to test whether a given type can appear in a numeric context, such as an operand of a multiply operator.
    
    Overrides:
    
    matchesNumberContext in class JSType
  - matchesObjectContext
```
public boolean matchesObjectContext()
```
    Description copied from class: JSType
    
    This predicate is used to test whether a given type can appear in an Object context, such as the expression in a with statement. Most types we will encounter, except notably null, have at least the potential for converting to Object. Host defined objects can get peculiar.
    
    Overrides:
    
    matchesObjectContext in class JSType
  - matchesStringContext
```
public boolean matchesStringContext()
```
    Description copied from class: JSType
    
    This predicate is used to test whether a given type can appear in a String context, such as an operand of a string concat (+) operator. All types have at least the potential for converting to String. When we add externally defined types, such as a browser OM, we may choose to add types that do not automatically convert to String.
    
    Overrides:
    
    matchesStringContext in class JSType
  - isVoidType
```
public boolean isVoidType()
```
    Overrides:
    
    isVoidType in class JSType
  - getDisplayName
```
public String getDisplayName()
```
    Description copied from class: JSType
    
    Returns a user meaningful label for the JSType instance. For example, Functions and Enums will return their declaration name (if they have one). Some types will not have a meaningful display name. Calls to hasDisplayName() will return true IFF getDisplayName() will return null or a zero length string.
    
    Overrides:
    
    getDisplayName in class JSType
    
    Returns:
    the display name of the type, or null if one is not available
  - getPossibleToBooleanOutcomes
```
public BooleanLiteralSet getPossibleToBooleanOutcomes()
```
    Description copied from class: JSType
    
    Computes the set of possible outcomes of the ToBoolean predicate for this type. The ToBoolean predicate is defined by the ECMA-262 standard, 3^rd edition. Its behavior for simple types can be summarized by the following table:
    
    type result
    
    undefined {false}
    
    null {false}
    
    boolean {true, false}
    
    number {true, false}
    
    string {true, false}
    
    Object {true}
    
    Specified by:
    
    getPossibleToBooleanOutcomes in class JSType
    
    Returns:
    the set of boolean literals for this type
  - visit
```
public <T> T visit(Visitor<T> visitor)
```
    Description copied from class: JSType
    
    Visit this type with the given visitor.
    
    Specified by:
    
    visit in class JSType
    
    Returns:
    the value returned by the visitor
    See Also:
    Visitor
  - hasDisplayName
```
public boolean hasDisplayName()
```
    Overrides:
    
    hasDisplayName in class JSType
    
    Returns:
    true if the JSType has a user meaningful label.

type	result
`undefined`	{false}
`null`	{false}
`boolean`	{true, false}
`number`	{true, false}
`string`	{true, false}
`Object`	{true}

Class VoidType

Nested Class Summary

Nested classes/interfaces inherited from class com.google.javascript.rhino.jstype.JSType

Field Summary

Fields inherited from class com.google.javascript.rhino.jstype.JSType

Method Summary

Methods inherited from class com.google.javascript.rhino.jstype.JSType

Methods inherited from class java.lang.Object

Method Detail

restrictByNotNullOrUndefined

testForEquality

matchesNumberContext

matchesObjectContext

matchesStringContext

isVoidType

getDisplayName

getPossibleToBooleanOutcomes

visit

hasDisplayName