Function catchError

test/parseJson.unittest.js:13–20

(/** @type {() => void} */ fn)

// is exercised directly against synthetic messages to stay engine-independent.

const catchError = (/** @type {() => void} */ fn) => {
	try {
		fn();
	} catch (err) {
		return /** @type {JSONParseError} */ (err);
	}
	throw new Error("expected parseJson to throw");
};

describe("parseJson", () => {
	it("parses JSON", () => {