mirror of https://github.com/denoland/deno.git
81 lines
2.1 KiB
TypeScript
81 lines
2.1 KiB
TypeScript
// Ported from js-yaml v3.13.1:
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// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
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// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
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// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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// deno-lint-ignore no-explicit-any
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export type Any = any;
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export function isNothing(subject: unknown): subject is never {
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return typeof subject === "undefined" || subject === null;
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}
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export function isArray(value: unknown): value is Any[] {
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return Array.isArray(value);
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}
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export function isBoolean(value: unknown): value is boolean {
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return typeof value === "boolean" || value instanceof Boolean;
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}
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export function isNull(value: unknown): value is null {
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return value === null;
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}
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export function isNumber(value: unknown): value is number {
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return typeof value === "number" || value instanceof Number;
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}
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export function isString(value: unknown): value is string {
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return typeof value === "string" || value instanceof String;
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}
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export function isSymbol(value: unknown): value is symbol {
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return typeof value === "symbol";
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}
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export function isUndefined(value: unknown): value is undefined {
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return value === undefined;
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}
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export function isObject(value: unknown): value is Record<string, unknown> {
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return value !== null && typeof value === "object";
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}
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export function isError(e: unknown): boolean {
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return e instanceof Error;
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}
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export function isFunction(value: unknown): value is () => void {
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return typeof value === "function";
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}
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export function isRegExp(value: unknown): value is RegExp {
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return value instanceof RegExp;
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}
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export function toArray<T>(sequence: T): T | [] | [T] {
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if (isArray(sequence)) return sequence;
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if (isNothing(sequence)) return [];
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return [sequence];
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}
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export function repeat(str: string, count: number): string {
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let result = "";
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for (let cycle = 0; cycle < count; cycle++) {
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result += str;
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}
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return result;
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}
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export function isNegativeZero(i: number): boolean {
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return i === 0 && Number.NEGATIVE_INFINITY === 1 / i;
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}
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export interface ArrayObject<T = Any> {
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[P: string]: T;
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}
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