Method _preWalkArrayPattern

lib/javascript/JavascriptParser.js:3283–3307

* Pre walk array pattern. * @param {ArrayPattern} arrayPattern array pattern * @returns {Set<DestructuringAssignmentProperty> | undefined} set of names or undefined if not all keys are identifiers

(arrayPattern)

	 * @returns {Set<DestructuringAssignmentProperty> | undefined} set of names or undefined if not all keys are identifiers
	 */
	_preWalkArrayPattern(arrayPattern) {
		/** @type {Set<DestructuringAssignmentProperty>} */
		const props = new Set();
		const elements = arrayPattern.elements;
		for (let i = 0; i < elements.length; i++) {
			const element = elements[i];
			if (!element) continue;
			if (element.type === "RestElement") return;
			const pattern =
				element.type === "ObjectPattern"
					? this._preWalkObjectPattern(element)
					: element.type === "ArrayPattern"
						? this._preWalkArrayPattern(element)
						: undefined;
			props.add({
				id: `${i}`,
				range: /** @type {Range} */ (element.range),
				loc: /** @type {SourceLocation} */ (element.loc),
				pattern,
				shorthand: false
			});
		}

		return props;
	}

	/**
	 * Pre walk variable declarator.