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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | 3x 15x 1x 1x 1x 1x 1x 1x 1x 1x | import { isFunction } from './isFunction' /** * @param value The value to check * @returns {boolean} Returns true if the value is a pristine native function, else false * * @see {@link https://lodash.com/docs#isNative} * * @since v0.1.0-beta.1 */ export function isNative(value: unknown) { return isFunction(value) && /native code/.test(value.toString()) } if (import.meta.vitest) { const { test, expect } = import.meta.vitest test('isNative', () => { const originalAssign = Object.assign expect(isNative(originalAssign)).toBe(true) Object.assign = () => {} expect(isNative(Object.assign)).toBe(false) Object.assign = originalAssign expect(isNative(() => {})).toBe(false) }) } |