Function isNativeFunction

packages/shared/src/proxy.ts:49–51

(fn: unknown)

const NATIVE_FUNCTION_REGEX = /^\s*function\s*\(\)\s*\{\s*\[native code\]\s*\}\s*$/
function isNativeFunction(fn: unknown): fn is AnyFunction {
  return typeof fn === 'function' && NATIVE_FUNCTION_REGEX.test(fn.toString())
}

/**
 * Create a proxy that overlays one object (`overlay`) on top of another (`target`).