es-toolkit
Version:
A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.
18 lines (16 loc) • 680 B
JavaScript
const functionToString = Function.prototype.toString;
const REGEXP_SYNTAX_CHARS = /[\\^$.*+?()[\]{}|]/g;
const IS_NATIVE_FUNCTION_REGEXP = RegExp(`^${functionToString
.call(Object.prototype.hasOwnProperty)
.replace(REGEXP_SYNTAX_CHARS, '\\$&')
.replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?')}$`);
function isNative(value) {
if (typeof value !== 'function') {
return false;
}
if (globalThis?.['__core-js_shared__'] != null) {
throw new Error('Unsupported core-js use. Try https://npms.io/search?q=ponyfill.');
}
return IS_NATIVE_FUNCTION_REGEXP.test(functionToString.call(value));
}
export { isNative };