Microsoft/TypeScript
1
0
Fork 0
mirror of https://github.com/microsoft/TypeScript.git synced 2025-11-18 17:21:48 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #17633 from Microsoft/indexSignatureMappedType

Browse Source 
Mapped type and string index signature relations
This commit is contained in:
Anders Hejlsberg
2017-08-07 14:17:29 -07:00
committed by GitHub
parent 3118e81297 3efeb1e27f
commit aa0fc0b885
4 changed files with 160 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/compiler/checker.ts
+5
View File
@@ -9671,6 +9671,11 @@ namespace ts {
if (sourceInfo) {
return indexInfoRelatedTo(sourceInfo, targetInfo, reportErrors);
}
if (isGenericMappedType(source)) {
// A generic mapped type { [P in K]: T } is related to an index signature { [x: string]: U }
// if T is related to U.
return kind === IndexKind.String && isRelatedTo(getTemplateTypeFromMappedType(<MappedType>source), targetInfo.type, reportErrors);
}
if (isObjectLiteralType(source)) {
let related = Ternary.True;
if (kind === IndexKind.String) {