INNER CODE UNIT · TypeScript

ow

sindresorhus/ow · source/index.ts:182

const ow = <T>(value: unknown, labelOrPredicate: unknown, predicate?: BasePredicate<T>): void => {
	if (!isPredicate(labelOrPredicate) && typeof labelOrPredicate !== 'string') {
		throw new TypeError(`Expected second argument to be a predicate or a string, got \`${typeof labelOrPredicate}\``);
	}

	if (isPredicate(labelOrPredicate)) {
		// If the second argument is a predicate, infer the label
		const stackFrames = callsites();

		test(value, () => inferLabel(stackFrames), labelOrPredicate);

		return;
	}

	test(value, labelOrPredicate, predicate!);
};

Object.defineProperties(ow, {

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