Method walkGuardedBranch

lib/javascript/JavascriptParser.js:2428–2440

* Walks a conditional branch with its guard frame (if any) pushed onto the * parser-state guard stack for the duration of the branch body. * @param {EXPECTED_OBJECT | undefined | null} frame guard frame, or falsy when the branch is unguarded * @param {() => void} walk branch walk * @returns

(frame, walk)

	 * @returns {void}
	 */
	walkGuardedBranch(frame, walk) {
		if (!frame) {
			walk();
			return;
		}
		const stack = this.state.guardStack || (this.state.guardStack = []);
		stack.push(frame);
		try {
			walk();
		} finally {
			stack.pop();
		}
	}

	/**
	 * Processes the provided statement.