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hasSameKeys: Simplify and optimize for identical maps (#21763)

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Andy 2018-02-08 09:45:43 -08:00 committed by GitHub
parent 79dde93068
commit 28c4871c99
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1 changed files with 2 additions and 8 deletions
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10
src/compiler/builder.ts
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@ -41,15 +41,9 @@ namespace ts {
program: Program;
}
function hasSameKeys<T, U>(map1: ReadonlyMap<T> | undefined, map2: ReadonlyMap<U> | undefined) {
if (map1 === undefined) {
return map2 === undefined;
}
if (map2 === undefined) {
return map1 === undefined;
}
function hasSameKeys<T, U>(map1: ReadonlyMap<T> | undefined, map2: ReadonlyMap<U> | undefined): boolean {
// Has same size and every key is present in both maps
return map1.size === map2.size && !forEachKey(map1, key => !map2.has(key));
return map1 as ReadonlyMap<T | U> === map2 || map1 && map2 && map1.size === map2.size && !forEachKey(map1, key => !map2.has(key));
}
/**