Fix cache refresh when config is changed

.changeset/happy-oranges-invite.md

@@ -0,0 +1,5 @@
+---
+"stylelint": patch
+---
+
+Fixed: cache refresh when config is changed

lib/__tests__/standalone-cache.test.js

@@ -10,6 +10,10 @@ const removeFile = require('../testUtils/removeFile');
 const safeChdir = require('../testUtils/safeChdir');
 const standalone = require('../standalone');
 
+const isChanged = (file, targetFilePath) => {
+	return file.source === targetFilePath && !file.ignored;
+};
+
 const fixturesPath = path.join(__dirname, 'fixtures');
 const invalidFile = path.join(fixturesPath, 'empty-block.css');
 const syntaxErrorFile = path.join(fixturesPath, 'syntax_error.css');
@@ -68,8 +72,8 @@ describe('standalone cache', () => {
 		const { results } = await standalone(getConfig());
 
 		// Ensure only changed files are linted
-		expect(results.some((file) => file.source === validFile)).toBe(false);
-		expect(results.some((file) => file.source === newFileDest)).toBe(true);
+		expect(results.some((file) => isChanged(file, validFile))).toBe(false);
+		expect(results.some((file) => isChanged(file, newFileDest))).toBe(true);
 
 		const { cache } = fCache.createFromFile(expectedCacheFilePath);
 
@@ -92,8 +96,8 @@ describe('standalone cache', () => {
 		);
 
 		// Ensure all files are re-linted
-		expect(results.some((file) => file.source === validFile)).toBe(true);
-		expect(results.some((file) => file.source === newFileDest)).toBe(true);
+		expect(results.some((file) => isChanged(file, validFile))).toBe(true);
+		expect(results.some((file) => isChanged(file, newFileDest))).toBe(true);
 	});
 
 	it('invalid files are not cached', async () => {
@@ -105,8 +109,8 @@ describe('standalone cache', () => {
 		expect(errored).toBe(true);
 
 		// Ensure only changed files are linted
-		expect(results.some((file) => file.source === validFile)).toBe(false);
-		expect(results.some((file) => file.source === newFileDest)).toBe(true);
+		expect(results.some((file) => isChanged(file, validFile))).toBe(false);
+		expect(results.some((file) => isChanged(file, newFileDest))).toBe(true);
 
 		const { cache } = fCache.createFromFile(expectedCacheFilePath);
 
@@ -194,3 +198,47 @@ describe('standalone cache uses cacheLocation', () => {
 		expect(cache.getKey(validFile)).toBeTruthy();
 	});
 });
+
+describe('standalone cache uses a config file', () => {
+	const cwd = path.join(__dirname, 'tmp', 'standalone-cache-use-config-file');
+
+	safeChdir(cwd);
+
+	const configFile = path.join(cwd, '.stylelintrc.json');
+	const lintedFile = path.join(cwd, 'a.css');
+
+	beforeEach(async () => {
+		await fs.writeFile(lintedFile, 'a {}');
+	});
+
+	afterEach(async () => {
+		await removeFile(configFile);
+		await removeFile(lintedFile);
+	});
+
+	it('cache is discarded when a config file is changed', async () => {
+		const config = { files: [lintedFile], config: undefined, cache: true };
+
+		// No warnings when a rule is disabled.
+		await fs.writeFile(
+			configFile,
+			JSON.stringify({
+				rules: { 'block-no-empty': null },
+			}),
+		);
+		const { results } = await standalone(config);
+
+		expect(results[0].warnings).toHaveLength(0);
+
+		// Some warnings when a rule becomes enabled by changing the config.
+		await fs.writeFile(
+			configFile,
+			JSON.stringify({
+				rules: { 'block-no-empty': true },
+			}),
+		);
+		const { results: resultsNew } = await standalone(config);
+
+		expect(resultsNew[0].warnings).toHaveLength(1);
+	});
+});

lib/createStylelint.js

@@ -6,6 +6,7 @@ const getConfigForFile = require('./getConfigForFile');
 const getPostcssResult = require('./getPostcssResult');
 const isPathIgnored = require('./isPathIgnored');
 const lintSource = require('./lintSource');
+const FileCache = require('./utils/FileCache');
 const { cosmiconfig } = require('cosmiconfig');
 
 const IS_TEST = process.env.NODE_ENV === 'test';
@@ -35,6 +36,7 @@ function createStylelint(options = {}) {
 
 	stylelint._specifiedConfigCache = new Map();
 	stylelint._postcssResultCache = new Map();
+	stylelint._fileCache = new FileCache(stylelint._options.cacheLocation, stylelint._options.cwd);
 	stylelint._createStylelintResult = createStylelintResult.bind(null, stylelint);
 	stylelint._getPostcssResult = getPostcssResult.bind(null, stylelint);
 	stylelint._lintSource = lintSource.bind(null, stylelint);

lib/lintSource.js

@@ -66,6 +66,18 @@ module.exports = async function lintSource(stylelint, options = {}) {
 	const config = configForFile.config;
 	const existingPostcssResult = options.existingPostcssResult;
 
+	if (options.cache) {
+		stylelint._fileCache.calcHashOfConfig(config);
+
+		if (options.filePath && !stylelint._fileCache.hasFileChanged(options.filePath)) {
+			return existingPostcssResult
+				? Object.assign(existingPostcssResult, {
+						stylelint: createEmptyStylelintPostcssResult(),
+				  })
+				: createEmptyPostcssResult(inputFilePath);
+		}
+	}
+
 	/** @type {StylelintPostcssResult} */
 	const stylelintResult = {
 		ruleSeverities: {},

lib/standalone.js

@@ -9,16 +9,13 @@ const path = require('path');
 
 const createStylelint = require('./createStylelint');
 const createStylelintResult = require('./createStylelintResult');
-const FileCache = require('./utils/FileCache');
 const filterFilePaths = require('./utils/filterFilePaths');
 const formatters = require('./formatters');
 const getFileIgnorer = require('./utils/getFileIgnorer');
 const getFormatterOptionsText = require('./utils/getFormatterOptionsText');
-const hash = require('./utils/hash');
 const NoFilesFoundError = require('./utils/noFilesFoundError');
 const AllFilesIgnoredError = require('./utils/allFilesIgnoredError');
 const { assert } = require('./utils/validateTypes');
-const pkg = require('../package.json');
 const prepareReturnValue = require('./prepareReturnValue');
 
 const ALWAYS_IGNORED_GLOBS = ['**/node_modules/**'];
@@ -61,8 +58,6 @@ async function standalone({
 	reportNeedlessDisables,
 	syntax,
 }) {
-	/** @type {FileCache} */
-	let fileCache;
 	const startTime = Date.now();
 
 	const isValidCode = typeof code === 'string';
@@ -95,6 +90,7 @@ async function standalone({
 	}
 
 	const stylelint = createStylelint({
+		cacheLocation,
 		config,
 		configFile,
 		configBasedir,
@@ -175,16 +171,8 @@ async function standalone({
 		fileList = fileList.concat(ALWAYS_IGNORED_GLOBS.map((glob) => `!${glob}`));
 	}
 
-	if (useCache) {
-		const stylelintVersion = pkg.version;
-		const hashOfConfig = hash(`${stylelintVersion}_${JSON.stringify(config || {})}`);
-
-		fileCache = new FileCache(cacheLocation, cwd, hashOfConfig);
-	} else {
-		// No need to calculate hash here, we just want to delete cache file.
-		fileCache = new FileCache(cacheLocation, cwd);
-		// Remove cache file if cache option is disabled
-		fileCache.destroy();
+	if (!useCache) {
+		stylelint._fileCache.destroy();
 	}
 
 	const effectiveGlobbyOptions = {
@@ -217,21 +205,18 @@ async function standalone({
 			return absoluteFilepath;
 		});
 
-		if (useCache) {
-			absoluteFilePaths = absoluteFilePaths.filter(fileCache.hasFileChanged.bind(fileCache));
-		}
-
 		const getStylelintResults = absoluteFilePaths.map(async (absoluteFilepath) => {
 			debug(`Processing ${absoluteFilepath}`);
 
 			try {
 				const postcssResult = await stylelint._lintSource({
 					filePath: absoluteFilepath,
+					cache: useCache,
 				});
 
 				if (postcssResult.stylelint.stylelintError && useCache) {
 					debug(`${absoluteFilepath} contains linting errors and will not be cached.`);
-					fileCache.removeEntry(absoluteFilepath);
+					stylelint._fileCache.removeEntry(absoluteFilepath);
 				}
 
 				/**
@@ -258,7 +243,7 @@ async function standalone({
 				return stylelint._createStylelintResult(postcssResult, absoluteFilepath);
 			} catch (error) {
 				// On any error, we should not cache the lint result
-				fileCache.removeEntry(absoluteFilepath);
+				stylelint._fileCache.removeEntry(absoluteFilepath);
 
 				return handleError(stylelint, error, absoluteFilepath);
 			}
@@ -275,7 +260,7 @@ async function standalone({
 	}
 
 	if (useCache) {
-		fileCache.reconcile();
+		stylelint._fileCache.reconcile();
 	}
 
 	const result = prepareReturnValue(stylelintResults, maxWarnings, formatterFunction, cwd);

lib/utils/FileCache.js

@@ -3,29 +3,37 @@
 const debug = require('debug')('stylelint:file-cache');
 const fileEntryCache = require('file-entry-cache');
 const getCacheFile = require('./getCacheFile');
+const hash = require('./hash');
+const pkg = require('../../package.json');
 const path = require('path');
 
 const DEFAULT_CACHE_LOCATION = './.stylelintcache';
-const DEFAULT_HASH = '';
 
 /** @typedef {import('file-entry-cache').FileDescriptor["meta"] & { hashOfConfig?: string }} CacheMetadata */
 
-/**
- * @param {string} [cacheLocation]
- * @param {string} [hashOfConfig]
- * @constructor
- */
 class FileCache {
-	constructor(
-		cacheLocation = DEFAULT_CACHE_LOCATION,
-		cwd = process.cwd(),
-		hashOfConfig = DEFAULT_HASH,
-	) {
+	/**
+	 * @param {string | undefined} cacheLocation
+	 * @param {string} cwd
+	 */
+	constructor(cacheLocation = DEFAULT_CACHE_LOCATION, cwd) {
 		const cacheFile = path.resolve(getCacheFile(cacheLocation, cwd));
 
 		debug(`Cache file is created at ${cacheFile}`);
 		this._fileCache = fileEntryCache.create(cacheFile);
-		this._hashOfConfig = hashOfConfig;
+		this._hashOfConfig = '';
+	}
+
+	/**
+	 * @param {import('stylelint').Config} config
+	 */
+	calcHashOfConfig(config) {
+		if (this._hashOfConfig) return;
+
+		const stylelintVersion = pkg.version;
+		const configString = JSON.stringify(config || {});
+
+		this._hashOfConfig = hash(`${stylelintVersion}_${configString}`);
 	}
 
 	/**

types/stylelint/index.d.ts

@@ -2,6 +2,7 @@ declare module 'stylelint' {
 	import type * as PostCSS from 'postcss';
 	import type { GlobbyOptions } from 'globby';
 	import type { cosmiconfig } from 'cosmiconfig';
+	import type * as fileEntryCache from 'file-entry-cache';
 
 	namespace stylelint {
 		export type Severity = 'warning' | 'error';
@@ -87,6 +88,14 @@ declare module 'stylelint' {
 
 		export type DisabledWarning = { line: number; rule: string };
 
+		type FileCache = {
+			calcHashOfConfig: (config: Config) => void;
+			hasFileChanged: (absoluteFilepath: string) => boolean;
+			reconcile: () => void;
+			destroy: () => void;
+			removeEntry: (absoluteFilepath: string) => void;
+		};
+
 		export type StylelintPostcssResult = {
 			ruleSeverities: { [ruleName: string]: Severity };
 			customMessages: { [ruleName: string]: RuleMessage };
@@ -205,6 +214,7 @@ declare module 'stylelint' {
 
 		export type GetLintSourceOptions = GetPostcssOptions & {
 			existingPostcssResult?: PostCSS.Result;
+			cache?: boolean;
 		};
 
 		export type LinterOptions = {
@@ -517,6 +527,7 @@ declare module 'stylelint' {
 			_extendExplorer: ReturnType<typeof cosmiconfig>;
 			_specifiedConfigCache: Map<Config, Promise<CosmiconfigResult>>;
 			_postcssResultCache: Map<string, PostCSS.Result>;
+			_fileCache: FileCache;
 
 			_getPostcssResult: (options?: GetPostcssOptions) => Promise<PostCSS.Result>;
 			_lintSource: (options: GetLintSourceOptions) => Promise<PostcssResult>;