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Comment getTypeReferenceId and getRelationKey

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This commit is contained in:
Nathan Shively-Sanders 2017-08-23 11:57:06 -07:00
parent 7a9491384c
commit f30931cddd
1 changed files with 8 additions and 0 deletions
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8
src/compiler/checker.ts
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@ -9779,6 +9779,10 @@ namespace ts {
return getObjectFlags(type) & ObjectFlags.Reference && some((<TypeReference>type).typeArguments, isUnconstrainedTypeParameter);
}
/**
* getTypeReferenceId(A<T, number, U>) returns "111=0-12=1"
* where A.id=111 and number.id=12
*/
function getTypeReferenceId(type: TypeReference, typeParameters: Type[]) {
let result = "" + type.target.id;
for (const t of type.typeArguments) {
@ -9797,6 +9801,10 @@ namespace ts {
return result;
}
/**
* To improve caching, the relation key for two generic types uses the target's id plus ids of the type parameters.
* For other cases, the types ids are used.
*/
function getRelationKey(source: Type, target: Type, relation: Map<RelationComparisonResult>) {
if (relation === identityRelation && source.id > target.id) {
const temp = source;