microsoft/TypeScript
1
0
Fork 0
mirror of https://github.com/microsoft/TypeScript.git synced 2026-05-19 10:41:56 -05:00
Code Issues Packages Projects Releases 212 Wiki Activity

Implement inferrable index signatures for enum types

Browse Source
This commit is contained in:
Anders Hejlsberg
2019-05-22 17:12:37 -07:00
parent de96b41272
commit b688e25cd3
1 changed files with 6 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/compiler/checker.ts
View File

@@ -7299,7 +7299,8 @@ namespace ts {
stringIndexInfo = createIndexInfo(anyType, /*isReadonly*/ false);
}
}
const numberIndexInfo = symbol.flags & SymbolFlags.Enum ? enumNumberIndexInfo : undefined;
const numberIndexInfo = symbol.flags & SymbolFlags.Enum && (getDeclaredTypeOfSymbol(symbol).flags & TypeFlags.Enum ||
some(type.properties, prop => !!(getTypeOfSymbol(prop).flags & TypeFlags.NumberLike))) ? enumNumberIndexInfo : undefined;
setStructuredTypeMembers(type, members, emptyArray, emptyArray, stringIndexInfo, numberIndexInfo);
// We resolve the members before computing the signatures because a signature may use
// typeof with a qualified name expression that circularly references the type we are
@@ -8161,6 +8162,9 @@ namespace ts {
propTypes.push(getTypeOfSymbol(prop));
}
}
if (kind === IndexKind.String) {
append(propTypes, getIndexTypeOfType(type, IndexKind.Number));
}
if (propTypes.length) {
return getUnionType(propTypes, UnionReduction.Subtype);
}
@@ -14498,7 +14502,7 @@ namespace ts {
* with no call or construct signatures.
*/
function isObjectTypeWithInferableIndex(type: Type) {
return type.symbol && (type.symbol.flags & (SymbolFlags.ObjectLiteral | SymbolFlags.TypeLiteral | SymbolFlags.ValueModule)) !== 0 &&
return type.symbol && (type.symbol.flags & (SymbolFlags.ObjectLiteral | SymbolFlags.TypeLiteral | SymbolFlags.Enum| SymbolFlags.ValueModule)) !== 0 &&
!typeHasCallOrConstructSignatures(type);
}