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aiya000/hasUndefienedPropertyOrThat.ts

Created November 30, 2020 04:47
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hasUndefienedPropertyOrThat.ts
function hasUndefienedPropertyOrThat<
PropType,
Prop extends string,
Base extends { [P in Prop]?: PropType }
>(p: (x: PropType | undefined) => x is PropType, x: Base, prop: Prop): boolean {
return x[prop] === undefined || p(x[prop]);
}
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