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Optimize filterType to only call getUnionType if necessary

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This commit is contained in:
Anders Hejlsberg 2016-08-11 10:23:27 -07:00
parent e00ce94b94
commit 24d8d848f1
1 changed files with 20 additions and 3 deletions
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23
src/compiler/checker.ts
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@ -8172,9 +8172,26 @@ namespace ts {
}
function filterType(type: Type, f: (t: Type) => boolean): Type {
return type.flags & TypeFlags.Union ?
getUnionType(filter((<UnionType>type).types, f)) :
f(type) ? type : neverType;
if (!(type.flags & TypeFlags.Union)) {
return f(type) ? type : neverType;
}
let types = (<UnionType>type).types;
let length = types.length;
let i = 0;
while (i < length && f(types[i])) i++;
if (i === length) {
return type;
}
let filtered = types.slice(0, i);
i++;
while (i < length) {
const t = types[i];
if (f(t)) {
filtered.push(t);
}
i++;
}
return getUnionType(filtered);
}
function isIncomplete(flowType: FlowType) {