/// <reference types="node" />
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import * as FS from "fs";
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export declare const isArray: (arg: any) => arg is any[];
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/**
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* Converts a single value into an array containing that value, unless the value is already an array.
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*/
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export declare function arrayify<T>(v: T | T[]): T[];
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/**
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* Converts an array of length 1 to the one value in it. Other arrays are passed through unchanged.
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*/
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export declare function unarrayify<T>(v: T[]): T | typeof v;
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export declare function readFileP(path: FS.PathLike): Promise<Buffer>;
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export declare function mapObjByKeys<K extends PropertyKey, T, U>(obj: {
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[key in K]: T;
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}, keys: ReadonlyArray<K>, fun: (value: T, key: K) => U, target?: {
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[key in K]: U;
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}): {
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[key in K]: U;
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};
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