Function rules

test/walkCssTokensParser.unittest.js:452–457

(src)

	 * @returns {{ type: number, childRules: number, decls: number }[]} top-level rule summary
	 */
	const rules = (src) =>
		parseAStylesheet(src).rules.map((r) => ({
			type: r.type,
			childRules: r.childRules ? r.childRules.length : 0,
			decls: r.declarations ? r.declarations.length : 0
		}));

	it("parses nested style rules and mixed declarations", () => {
		expect(rules("a{&:hover{x:1}}")[0]).toMatchObject({