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Instantiate contextual this parameters if needed

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This commit is contained in:
Nathan Shively-Sanders 2016-07-14 14:17:50 -07:00
parent f9d29370b6
commit ad56220c45
1 changed files with 7 additions and 0 deletions
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7
src/compiler/checker.ts
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@ -4632,6 +4632,9 @@ namespace ts {
function getThisTypeOfSignature(signature: Signature): Type | undefined {
if (signature.thisParameter) {
if (signature.mapper) {
signature = instantiateSignature(signature, signature.mapper);
}
return getTypeOfSymbol(signature.thisParameter);
}
}
@ -11770,6 +11773,10 @@ namespace ts {
function assignContextualParameterTypes(signature: Signature, context: Signature, mapper: TypeMapper) {
const len = signature.parameters.length - (signature.hasRestParameter ? 1 : 0);
if (context.thisParameter) {
// save the mapper in case we need to type `this` later
context.mapper = mapper;
}
for (let i = 0; i < len; i++) {
const parameter = signature.parameters[i];
const contextualParameterType = getTypeAtPosition(context, i);