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Fixed inference between type placeholders with non-string constraints in template literal types (#57808)

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Mateusz Burzyński
2024-03-18 21:52:57 +01:00
committed by GitHub
parent 6086292f66
commit a46664ac64
5 changed files with 175 additions and 1 deletions
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4
src/compiler/checker.ts
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@@ -25532,7 +25532,9 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
function inferTypesFromTemplateLiteralType(source: Type, target: TemplateLiteralType): Type[] | undefined {
return source.flags & TypeFlags.StringLiteral ? inferFromLiteralPartsToTemplateLiteral([(source as StringLiteralType).value], emptyArray, target) :
source.flags & TypeFlags.TemplateLiteral ?
arraysEqual((source as TemplateLiteralType).texts, target.texts) ? map((source as TemplateLiteralType).types, getStringLikeTypeForType) :
arraysEqual((source as TemplateLiteralType).texts, target.texts) ? map((source as TemplateLiteralType).types, (s, i) => {
return isTypeAssignableTo(getBaseConstraintOrType(s), getBaseConstraintOrType(target.types[i])) ? s : getStringLikeTypeForType(s);
}) :
inferFromLiteralPartsToTemplateLiteral((source as TemplateLiteralType).texts, (source as TemplateLiteralType).types, target) :
undefined;
}