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Fix bug: result of createUnionOrIntersectionProperty may be undefined (#21332)

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This commit is contained in:
Andy
2018-01-22 10:15:57 -08:00
committed by GitHub
parent a3ecfd857c
commit 588716926d
2 changed files with 7 additions and 3 deletions
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6
src/compiler/checker.ts
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@@ -5995,7 +5995,9 @@ namespace ts {
for (const memberType of types) {
for (const { escapedName } of getAugmentedPropertiesOfType(memberType)) {
if (!props.has(escapedName)) {
props.set(escapedName, createUnionOrIntersectionProperty(unionType as UnionType, escapedName));
const prop = createUnionOrIntersectionProperty(unionType as UnionType, escapedName);
// May be undefined if the property is private
if (prop) props.set(escapedName, prop);
}
}
}
@@ -6177,7 +6179,7 @@ namespace ts {
t;
}
function createUnionOrIntersectionProperty(containingType: UnionOrIntersectionType, name: __String): Symbol {
function createUnionOrIntersectionProperty(containingType: UnionOrIntersectionType, name: __String): Symbol | undefined {
let props: Symbol[];
const isUnion = containingType.flags & TypeFlags.Union;
const excludeModifiers = isUnion ? ModifierFlags.NonPublicAccessibilityModifier : 0;