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Workaround for nonnull operator on indexed accesses (#19275)

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* Quick and dirty workaround

* Add third case to show current behavior

* Rename variable, replace elaboration from comment with links
This commit is contained in:
Wesley Wigham
2017-10-18 17:39:05 -07:00
committed by GitHub
parent d8373c3dbb
commit 8212c962cd
5 changed files with 278 additions and 0 deletions
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10
src/compiler/checker.ts
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@@ -11376,6 +11376,16 @@ namespace ts {
}
function getTypeWithFacts(type: Type, include: TypeFacts) {
if (type.flags & TypeFlags.IndexedAccess) {
// TODO (weswig): This is a substitute for a lazy negated type to remove the types indicated by the TypeFacts from the (potential) union the IndexedAccess refers to
// - See discussion in https://github.com/Microsoft/TypeScript/pull/19275 for details, and test `strictNullNotNullIndexTypeShouldWork` for current behavior
const baseConstraint = getBaseConstraintOfType(type) || emptyObjectType;
const result = filterType(baseConstraint, t => (getTypeFacts(t) & include) !== 0);
if (result !== baseConstraint) {
return result;
}
return type;
}
return filterType(type, t => (getTypeFacts(t) & include) !== 0);
}