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Forward intersection state flag to conditional type target check (#50620)

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This commit is contained in:
Andrew Branch
2022-09-07 10:07:24 -07:00
committed by GitHub
parent b58721fe15
commit bb6f36f7c8
5 changed files with 56 additions and 2 deletions
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4
src/compiler/checker.ts
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@@ -19821,8 +19821,8 @@ namespace ts {
const skipTrue = !isTypeAssignableTo(getPermissiveInstantiation(c.checkType), getPermissiveInstantiation(c.extendsType));
const skipFalse = !skipTrue && isTypeAssignableTo(getRestrictiveInstantiation(c.checkType), getRestrictiveInstantiation(c.extendsType));
// TODO: Find a nice way to include potential conditional type breakdowns in error output, if they seem good (they usually don't)
if (result = skipTrue ? Ternary.True : isRelatedTo(source, getTrueTypeFromConditionalType(c), RecursionFlags.Target, /*reportErrors*/ false)) {
result &= skipFalse ? Ternary.True : isRelatedTo(source, getFalseTypeFromConditionalType(c), RecursionFlags.Target, /*reportErrors*/ false);
if (result = skipTrue ? Ternary.True : isRelatedTo(source, getTrueTypeFromConditionalType(c), RecursionFlags.Target, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState)) {
result &= skipFalse ? Ternary.True : isRelatedTo(source, getFalseTypeFromConditionalType(c), RecursionFlags.Target, /*reportErrors*/ false, /*headMessage*/ undefined, intersectionState);
if (result) {
return result;
}