es-toolkit

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A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.

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text/typescript

import { Equals } from './Equals.d.mjs'; type IsWritable<T> = Equals<{ [K in keyof T]: T[K] }, { -readonly [K in keyof T]: T[K] }>; export type { IsWritable };