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Merge pull request #8340 from Microsoft/nothingType

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Display 'nothing' for the empty union type
This commit is contained in:
Anders Hejlsberg
2016-04-27 14:58:00 -07:00
parent 70d805a935 9da4323c80
commit 0613ad1963
12 changed files with 32 additions and 25 deletions
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11
src/compiler/checker.ts
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@@ -2014,7 +2014,12 @@ namespace ts {
writeUnionOrIntersectionType(<UnionOrIntersectionType>type, flags);
}
else if (type.flags & TypeFlags.Anonymous) {
writeAnonymousType(<ObjectType>type, flags);
if (type === emptyUnionType) {
writer.writeKeyword("nothing");
}
else {
writeAnonymousType(<ObjectType>type, flags);
}
}
else if (type.flags & TypeFlags.StringLiteral) {
writer.writeStringLiteral(`"${escapeString((<StringLiteralType>type).text)}"`);
@@ -4247,7 +4252,9 @@ namespace ts {
propTypes.push(getTypeOfSymbol(prop));
}
}
return getUnionType(propTypes);
if (propTypes.length) {
return getUnionType(propTypes);
}
}
return undefined;
}