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Revert change to getFalsyFlags (#47125)

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* Revert change to getFalsyFlags

* Add regression test
This commit is contained in:
Anders Hejlsberg
2021-12-13 09:05:55 -08:00
committed by GitHub
parent d4170586f0
commit 06746efbd9
6 changed files with 158 additions and 1 deletions
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2
src/compiler/checker.ts
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@@ -20893,7 +20893,7 @@ namespace ts {
// flags for the string, number, boolean, "", 0, false, void, undefined, or null types respectively. Returns
// no flags for all other types (including non-falsy literal types).
function getFalsyFlags(type: Type): TypeFlags {
return type.flags & TypeFlags.UnionOrIntersection ? getFalsyFlagsOfTypes((type as UnionType).types) :
return type.flags & TypeFlags.Union ? getFalsyFlagsOfTypes((type as UnionType).types) :
type.flags & TypeFlags.StringLiteral ? (type as StringLiteralType).value === "" ? TypeFlags.StringLiteral : 0 :
type.flags & TypeFlags.NumberLiteral ? (type as NumberLiteralType).value === 0 ? TypeFlags.NumberLiteral : 0 :
type.flags & TypeFlags.BigIntLiteral ? isZeroBigInt(type as BigIntLiteralType) ? TypeFlags.BigIntLiteral : 0 :