Improve isValidSpreadType check #47010
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typescript-bot
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Author: Team
For Milestone Bug
sandersn
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Dec 3, 2021
| return !!(type.flags & (TypeFlags.Any | TypeFlags.NonPrimitive | TypeFlags.Object | TypeFlags.InstantiableNonPrimitive) || | ||
| getFalsyFlags(type) & TypeFlags.DefinitelyFalsy && isValidSpreadType(removeDefinitelyFalsyTypes(type)) || | ||
| type.flags & TypeFlags.UnionOrIntersection && every((type as UnionOrIntersectionType).types, isValidSpreadType)); | ||
| const t = removeDefinitelyFalsyTypes(mapType(type, getBaseConstraintOrType)); |
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love that we have functions named getBaseConstraintOrType and getBaseConstraintOfType
| @@ -20857,7 +20857,7 @@ 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.Union ? getFalsyFlagsOfTypes((type as UnionType).types) : | |||
| return type.flags & TypeFlags.UnionOrIntersection ? getFalsyFlagsOfTypes((type as UnionType).types) : | |||
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I'm a little surprised that adding intersections to getFalsyFlags didn't change any existing baselines.
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Well, there are precious few intersections that would be affected, pretty much only those like T & undefined that will now appear to be falsy.
|
Regression: #47028 (comment) |
mprobst
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to mprobst/TypeScript
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Jan 10, 2022
* Fix getFalsyFlags for intersection types * Fix and simplify isValidSpreadType * Slight tweak * Add tests
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Fixes #46976.