type-plus/cjs/bigint/cast.d.ts

Provides additional types for TypeScript.

/**
 * Cast a string to a bigint literal type if possible.
 *
 * ```ts
 * StringToBigint<'1n'> // 1n
 * StringToBigint<'-1n'> // -1n
 * ```
 */
export type StringToBigint<S extends string, Fail = never> = S extends `-0n` ? 0n : S extends `${infer N extends bigint}n` ? N : Fail;
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