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std/node/util.ts

Deno standard library
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export function isArray(value: unknown): boolean { return Array.isArray(value);}
export function isBoolean(value: unknown): boolean { return typeof value === "boolean" || value instanceof Boolean;}
export function isNull(value: unknown): boolean { return value === null;}
export function isNullOrUndefined(value: unknown): boolean { return value === null || value === undefined;}
export function isNumber(value: unknown): boolean { return typeof value === "number" || value instanceof Number;}
export function isString(value: unknown): boolean { return typeof value === "string" || value instanceof String;}
export function isSymbol(value: unknown): boolean { return typeof value === "symbol";}
export function isUndefined(value: unknown): boolean { return value === undefined;}
export function isObject(value: unknown): boolean { return value !== null && typeof value === "object";}
export function isError(e: unknown): boolean { return e instanceof Error;}
export function isFunction(value: unknown): boolean { return typeof value === "function";}
export function isRegExp(value: unknown): boolean { return value instanceof RegExp;}
export function isPrimitive(value: unknown): boolean { return ( value === null || (typeof value !== "object" && typeof value !== "function") );}
export function validateIntegerRange( value: number, name: string, min = -2147483648, max = 2147483647): void { // The defaults for min and max correspond to the limits of 32-bit integers. if (!Number.isInteger(value)) { throw new Error(`${name} must be 'an integer' but was ${value}`); } if (value < min || value > max) { throw new Error( `${name} must be >= ${min} && <= ${max}. Value was ${value}` ); }}