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Consider ReadonlyArray<T> an array-like type

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This commit is contained in:
Anders Hejlsberg 2016-01-19 15:46:12 -08:00
parent cac3a32513
commit 8bb00feb09
1 changed files with 9 additions and 2 deletions
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11
src/compiler/checker.ts
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@ -145,6 +145,7 @@ namespace ts {
let globalObjectType: ObjectType;
let globalFunctionType: ObjectType;
let globalArrayType: GenericType;
let globalReadonlyArrayType: GenericType;
let globalStringType: ObjectType;
let globalNumberType: ObjectType;
let globalBooleanType: ObjectType;
@ -156,6 +157,7 @@ namespace ts {
let globalIterableIteratorType: GenericType;
let anyArrayType: Type;
let anyReadonlyArrayType: Type;
let getGlobalClassDecoratorType: () => ObjectType;
let getGlobalParameterDecoratorType: () => ObjectType;
let getGlobalPropertyDecoratorType: () => ObjectType;
@ -6054,8 +6056,10 @@ namespace ts {
}
function isArrayLikeType(type: Type): boolean {
// A type is array-like if it is not the undefined or null type and if it is assignable to any[]
return !(type.flags & (TypeFlags.Undefined | TypeFlags.Null)) && isTypeAssignableTo(type, anyArrayType);
// A type is array-like if it is a reference to the global Array or global ReadonlyArray type,
// or if it is not the undefined or null type and if it is assignable to ReadonlyArray<any>
return type.flags & TypeFlags.Reference && ((<TypeReference>type).target === globalArrayType || (<TypeReference>type).target === globalReadonlyArrayType) ||
!(type.flags & (TypeFlags.Undefined | TypeFlags.Null)) && isTypeAssignableTo(type, anyReadonlyArrayType);
}
function isTupleLikeType(type: Type): boolean {
@ -15719,6 +15723,7 @@ namespace ts {
// Initialize special types
globalArrayType = <GenericType>getGlobalType("Array", /*arity*/ 1);
globalReadonlyArrayType = <GenericType>getGlobalType("ReadonlyArray", /*arity*/ 1);
globalObjectType = getGlobalType("Object");
globalFunctionType = getGlobalType("Function");
globalStringType = getGlobalType("String");
@ -15763,6 +15768,8 @@ namespace ts {
}
anyArrayType = createArrayType(anyType);
anyReadonlyArrayType = globalReadonlyArrayType === emptyGenericType ? anyArrayType :
createTypeFromGenericGlobalType(globalReadonlyArrayType, [anyType]);
}
function createInstantiatedPromiseLikeType(): ObjectType {