deno/std/node/util.ts

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 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}`
    );
  }
}