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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.

es-toolkit.dev

toss/es-toolkit

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import { IsWritable } from './IsWritable.d.ts'; import { MutableList } from './MutableList.d.ts'; export type RejectReadonly<T extends MutableList<unknown>> = IsWritable<T> extends true ? T : never;