/** * @fileoverview Main CLI object. * @author Nicholas C. Zakas */ "use strict"; /* * The CLI object should *not* call process.exit() directly. It should only return * exit codes. This allows other programs to use the CLI object and still control * when the program exits. */ //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const fs = require("fs"), path = require("path"), defaultOptions = require("../conf/default-cli-options"), Linter = require("./linter"), lodash = require("lodash"), IgnoredPaths = require("./util/ignored-paths"), Config = require("./config"), ConfigOps = require("./config/config-ops"), LintResultCache = require("./util/lint-result-cache"), globUtils = require("./util/glob-utils"), validator = require("./config/config-validator"), hash = require("./util/hash"), ModuleResolver = require("./util/module-resolver"), naming = require("./util/naming"), pkg = require("../package.json"), loadRules = require("./load-rules"); const debug = require("debug")("eslint:cli-engine"); const resolver = new ModuleResolver(); const validFixTypes = new Set(["problem", "suggestion", "layout"]); //------------------------------------------------------------------------------ // Typedefs //------------------------------------------------------------------------------ /** * The options to configure a CLI engine with. * @typedef {Object} CLIEngineOptions * @property {boolean} allowInlineConfig Enable or disable inline configuration comments. * @property {Object} baseConfig Base config object, extended by all configs used with this CLIEngine instance * @property {boolean} cache Enable result caching. * @property {string} cacheLocation The cache file to use instead of .eslintcache. * @property {string} configFile The configuration file to use. * @property {string} cwd The value to use for the current working directory. * @property {string[]} envs An array of environments to load. * @property {string[]} extensions An array of file extensions to check. * @property {boolean|Function} fix Execute in autofix mode. If a function, should return a boolean. * @property {string[]} fixTypes Array of rule types to apply fixes for. * @property {string[]} globals An array of global variables to declare. * @property {boolean} ignore False disables use of .eslintignore. * @property {string} ignorePath The ignore file to use instead of .eslintignore. * @property {string} ignorePattern A glob pattern of files to ignore. * @property {boolean} useEslintrc False disables looking for .eslintrc * @property {string} parser The name of the parser to use. * @property {Object} parserOptions An object of parserOption settings to use. * @property {string[]} plugins An array of plugins to load. * @property {Object} rules An object of rules to use. * @property {string[]} rulePaths An array of directories to load custom rules from. * @property {boolean} reportUnusedDisableDirectives `true` adds reports for unused eslint-disable directives */ /** * A linting warning or error. * @typedef {Object} LintMessage * @property {string} message The message to display to the user. */ /** * A linting result. * @typedef {Object} LintResult * @property {string} filePath The path to the file that was linted. * @property {LintMessage[]} messages All of the messages for the result. * @property {number} errorCount Number of errors for the result. * @property {number} warningCount Number of warnings for the result. * @property {number} fixableErrorCount Number of fixable errors for the result. * @property {number} fixableWarningCount Number of fixable warnings for the result. * @property {string=} [source] The source code of the file that was linted. * @property {string=} [output] The source code of the file that was linted, with as many fixes applied as possible. */ //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Determines if each fix type in an array is supported by ESLint and throws * an error if not. * @param {string[]} fixTypes An array of fix types to check. * @returns {void} * @throws {Error} If an invalid fix type is found. */ function validateFixTypes(fixTypes) { for (const fixType of fixTypes) { if (!validFixTypes.has(fixType)) { throw new Error(`Invalid fix type "${fixType}" found.`); } } } /** * It will calculate the error and warning count for collection of messages per file * @param {Object[]} messages - Collection of messages * @returns {Object} Contains the stats * @private */ function calculateStatsPerFile(messages) { return messages.reduce((stat, message) => { if (message.fatal || message.severity === 2) { stat.errorCount++; if (message.fix) { stat.fixableErrorCount++; } } else { stat.warningCount++; if (message.fix) { stat.fixableWarningCount++; } } return stat; }, { errorCount: 0, warningCount: 0, fixableErrorCount: 0, fixableWarningCount: 0 }); } /** * It will calculate the error and warning count for collection of results from all files * @param {Object[]} results - Collection of messages from all the files * @returns {Object} Contains the stats * @private */ function calculateStatsPerRun(results) { return results.reduce((stat, result) => { stat.errorCount += result.errorCount; stat.warningCount += result.warningCount; stat.fixableErrorCount += result.fixableErrorCount; stat.fixableWarningCount += result.fixableWarningCount; return stat; }, { errorCount: 0, warningCount: 0, fixableErrorCount: 0, fixableWarningCount: 0 }); } /** * Processes an source code using ESLint. * @param {string} text The source code to check. * @param {Object} configHelper The configuration options for ESLint. * @param {string} filename An optional string representing the texts filename. * @param {boolean|Function} fix Indicates if fixes should be processed. * @param {boolean} allowInlineConfig Allow/ignore comments that change config. * @param {boolean} reportUnusedDisableDirectives Allow/ignore comments that change config. * @param {Linter} linter Linter context * @returns {{rules: LintResult, config: Object}} The results for linting on this text and the fully-resolved config for it. * @private */ function processText(text, configHelper, filename, fix, allowInlineConfig, reportUnusedDisableDirectives, linter) { let filePath, fileExtension, processor; if (filename) { filePath = path.resolve(filename); fileExtension = path.extname(filename); } const effectiveFilename = filename || ""; debug(`Linting ${effectiveFilename}`); const config = configHelper.getConfig(filePath); if (config.plugins) { configHelper.plugins.loadAll(config.plugins); } const loadedPlugins = configHelper.plugins.getAll(); for (const plugin in loadedPlugins) { if (loadedPlugins[plugin].processors && Object.keys(loadedPlugins[plugin].processors).indexOf(fileExtension) >= 0) { processor = loadedPlugins[plugin].processors[fileExtension]; break; } } const autofixingEnabled = typeof fix !== "undefined" && (!processor || processor.supportsAutofix); const fixedResult = linter.verifyAndFix(text, config, { filename: effectiveFilename, allowInlineConfig, reportUnusedDisableDirectives, fix: !!autofixingEnabled && fix, preprocess: processor && (rawText => processor.preprocess(rawText, effectiveFilename)), postprocess: processor && (problemLists => processor.postprocess(problemLists, effectiveFilename)) }); const stats = calculateStatsPerFile(fixedResult.messages); const result = { filePath: effectiveFilename, messages: fixedResult.messages, errorCount: stats.errorCount, warningCount: stats.warningCount, fixableErrorCount: stats.fixableErrorCount, fixableWarningCount: stats.fixableWarningCount }; if (fixedResult.fixed) { result.output = fixedResult.output; } if (result.errorCount + result.warningCount > 0 && typeof result.output === "undefined") { result.source = text; } return { result, config }; } /** * Processes an individual file using ESLint. Files used here are known to * exist, so no need to check that here. * @param {string} filename The filename of the file being checked. * @param {Object} configHelper The configuration options for ESLint. * @param {Object} options The CLIEngine options object. * @param {Linter} linter Linter context * @returns {{rules: LintResult, config: Object}} The results for linting on this text and the fully-resolved config for it. * @private */ function processFile(filename, configHelper, options, linter) { const text = fs.readFileSync(path.resolve(filename), "utf8"); return processText( text, configHelper, filename, options.fix, options.allowInlineConfig, options.reportUnusedDisableDirectives, linter ); } /** * Returns result with warning by ignore settings * @param {string} filePath - File path of checked code * @param {string} baseDir - Absolute path of base directory * @returns {LintResult} Result with single warning * @private */ function createIgnoreResult(filePath, baseDir) { let message; const isHidden = /^\./.test(path.basename(filePath)); const isInNodeModules = baseDir && path.relative(baseDir, filePath).startsWith("node_modules"); const isInBowerComponents = baseDir && path.relative(baseDir, filePath).startsWith("bower_components"); if (isHidden) { message = "File ignored by default. Use a negated ignore pattern (like \"--ignore-pattern '!'\") to override."; } else if (isInNodeModules) { message = "File ignored by default. Use \"--ignore-pattern '!node_modules/*'\" to override."; } else if (isInBowerComponents) { message = "File ignored by default. Use \"--ignore-pattern '!bower_components/*'\" to override."; } else { message = "File ignored because of a matching ignore pattern. Use \"--no-ignore\" to override."; } return { filePath: path.resolve(filePath), messages: [ { fatal: false, severity: 1, message } ], errorCount: 0, warningCount: 1, fixableErrorCount: 0, fixableWarningCount: 0 }; } /** * Produces rule warnings (i.e. deprecation) from configured rules * @param {(Array|Set)} usedRules - Rules configured * @param {Map} loadedRules - Map of loaded rules * @returns {Array} Contains rule warnings * @private */ function createRuleDeprecationWarnings(usedRules, loadedRules) { const usedDeprecatedRules = []; usedRules.forEach(name => { const loadedRule = loadedRules.get(name); if (loadedRule && loadedRule.meta && loadedRule.meta.deprecated) { const deprecatedRule = { ruleId: name }; const replacedBy = lodash.get(loadedRule, "meta.replacedBy", []); if (replacedBy.every(newRule => lodash.isString(newRule))) { deprecatedRule.replacedBy = replacedBy; } usedDeprecatedRules.push(deprecatedRule); } }); return usedDeprecatedRules; } /** * Checks if the given message is an error message. * @param {Object} message The message to check. * @returns {boolean} Whether or not the message is an error message. * @private */ function isErrorMessage(message) { return message.severity === 2; } /** * return the cacheFile to be used by eslint, based on whether the provided parameter is * a directory or looks like a directory (ends in `path.sep`), in which case the file * name will be the `cacheFile/.cache_hashOfCWD` * * if cacheFile points to a file or looks like a file then in will just use that file * * @param {string} cacheFile The name of file to be used to store the cache * @param {string} cwd Current working directory * @returns {string} the resolved path to the cache file */ function getCacheFile(cacheFile, cwd) { /* * make sure the path separators are normalized for the environment/os * keeping the trailing path separator if present */ const normalizedCacheFile = path.normalize(cacheFile); const resolvedCacheFile = path.resolve(cwd, normalizedCacheFile); const looksLikeADirectory = normalizedCacheFile.slice(-1) === path.sep; /** * return the name for the cache file in case the provided parameter is a directory * @returns {string} the resolved path to the cacheFile */ function getCacheFileForDirectory() { return path.join(resolvedCacheFile, `.cache_${hash(cwd)}`); } let fileStats; try { fileStats = fs.lstatSync(resolvedCacheFile); } catch (ex) { fileStats = null; } /* * in case the file exists we need to verify if the provided path * is a directory or a file. If it is a directory we want to create a file * inside that directory */ if (fileStats) { /* * is a directory or is a file, but the original file the user provided * looks like a directory but `path.resolve` removed the `last path.sep` * so we need to still treat this like a directory */ if (fileStats.isDirectory() || looksLikeADirectory) { return getCacheFileForDirectory(); } // is file so just use that file return resolvedCacheFile; } /* * here we known the file or directory doesn't exist, * so we will try to infer if its a directory if it looks like a directory * for the current operating system. */ // if the last character passed is a path separator we assume is a directory if (looksLikeADirectory) { return getCacheFileForDirectory(); } return resolvedCacheFile; } //------------------------------------------------------------------------------ // Public Interface //------------------------------------------------------------------------------ class CLIEngine { /** * Creates a new instance of the core CLI engine. * @param {CLIEngineOptions} providedOptions The options for this instance. * @constructor */ constructor(providedOptions) { const options = Object.assign( Object.create(null), defaultOptions, { cwd: process.cwd() }, providedOptions ); /* * if an --ignore-path option is provided, ensure that the ignore * file exists and is not a directory */ if (options.ignore && options.ignorePath) { try { if (!fs.statSync(options.ignorePath).isFile()) { throw new Error(`${options.ignorePath} is not a file`); } } catch (e) { e.message = `Error: Could not load file ${options.ignorePath}\nError: ${e.message}`; throw e; } } /** * Stored options for this instance * @type {Object} */ this.options = options; this.linter = new Linter(); // load in additional rules if (this.options.rulePaths) { const cwd = this.options.cwd; this.options.rulePaths.forEach(rulesdir => { debug(`Loading rules from ${rulesdir}`); this.linter.defineRules(loadRules(rulesdir, cwd)); }); } if (this.options.rules && Object.keys(this.options.rules).length) { const loadedRules = this.linter.getRules(); Object.keys(this.options.rules).forEach(name => { validator.validateRuleOptions(loadedRules.get(name), name, this.options.rules[name], "CLI"); }); } this.config = new Config(this.options, this.linter); if (this.options.cache) { const cacheFile = getCacheFile(this.options.cacheLocation || this.options.cacheFile, this.options.cwd); /** * Cache used to avoid operating on files that haven't changed since the * last successful execution. * @type {Object} */ this._lintResultCache = new LintResultCache(cacheFile, this.config); } // setup special filter for fixes if (this.options.fix && this.options.fixTypes && this.options.fixTypes.length > 0) { debug(`Using fix types ${this.options.fixTypes}`); // throw an error if any invalid fix types are found validateFixTypes(this.options.fixTypes); // convert to Set for faster lookup const fixTypes = new Set(this.options.fixTypes); // save original value of options.fix in case it's a function const originalFix = (typeof this.options.fix === "function") ? this.options.fix : () => this.options.fix; // create a cache of rules (but don't populate until needed) this._rulesCache = null; this.options.fix = lintResult => { const rule = this._rulesCache.get(lintResult.ruleId); const matches = rule.meta && fixTypes.has(rule.meta.type); return matches && originalFix(lintResult); }; } } getRules() { return this.linter.getRules(); } /** * Returns results that only contains errors. * @param {LintResult[]} results The results to filter. * @returns {LintResult[]} The filtered results. */ static getErrorResults(results) { const filtered = []; results.forEach(result => { const filteredMessages = result.messages.filter(isErrorMessage); if (filteredMessages.length > 0) { filtered.push( Object.assign(result, { messages: filteredMessages, errorCount: filteredMessages.length, warningCount: 0, fixableErrorCount: result.fixableErrorCount, fixableWarningCount: 0 }) ); } }); return filtered; } /** * Outputs fixes from the given results to files. * @param {Object} report The report object created by CLIEngine. * @returns {void} */ static outputFixes(report) { report.results.filter(result => Object.prototype.hasOwnProperty.call(result, "output")).forEach(result => { fs.writeFileSync(result.filePath, result.output); }); } /** * Add a plugin by passing its configuration * @param {string} name Name of the plugin. * @param {Object} pluginobject Plugin configuration object. * @returns {void} */ addPlugin(name, pluginobject) { this.config.plugins.define(name, pluginobject); } /** * Resolves the patterns passed into executeOnFiles() into glob-based patterns * for easier handling. * @param {string[]} patterns The file patterns passed on the command line. * @returns {string[]} The equivalent glob patterns. */ resolveFileGlobPatterns(patterns) { return globUtils.resolveFileGlobPatterns(patterns.filter(Boolean), this.options); } /** * Executes the current configuration on an array of file and directory names. * @param {string[]} patterns An array of file and directory names. * @returns {Object} The results for all files that were linted. */ executeOnFiles(patterns) { const options = this.options, lintResultCache = this._lintResultCache, configHelper = this.config; const cacheFile = getCacheFile(this.options.cacheLocation || this.options.cacheFile, this.options.cwd); if (!options.cache && fs.existsSync(cacheFile)) { fs.unlinkSync(cacheFile); } const startTime = Date.now(); const fileList = globUtils.listFilesToProcess(patterns, options); const allUsedRules = new Set(); const results = fileList.map(fileInfo => { if (fileInfo.ignored) { return createIgnoreResult(fileInfo.filename, options.cwd); } if (options.cache) { const cachedLintResults = lintResultCache.getCachedLintResults(fileInfo.filename); if (cachedLintResults) { const resultHadMessages = cachedLintResults.messages && cachedLintResults.messages.length; if (resultHadMessages && options.fix) { debug(`Reprocessing cached file to allow autofix: ${fileInfo.filename}`); } else { debug(`Skipping file since it hasn't changed: ${fileInfo.filename}`); return cachedLintResults; } } } // if there's a cache, populate it if ("_rulesCache" in this) { this._rulesCache = this.getRules(); } debug(`Processing ${fileInfo.filename}`); const { result, config } = processFile(fileInfo.filename, configHelper, options, this.linter); Object.keys(config.rules) .filter(ruleId => ConfigOps.getRuleSeverity(config.rules[ruleId])) .forEach(ruleId => allUsedRules.add(ruleId)); return result; }); if (options.cache) { results.forEach(result => { /* * Store the lint result in the LintResultCache. * NOTE: The LintResultCache will remove the file source and any * other properties that are difficult to serialize, and will * hydrate those properties back in on future lint runs. */ lintResultCache.setCachedLintResults(result.filePath, result); }); // persist the cache to disk lintResultCache.reconcile(); } const stats = calculateStatsPerRun(results); const usedDeprecatedRules = createRuleDeprecationWarnings(allUsedRules, this.getRules()); debug(`Linting complete in: ${Date.now() - startTime}ms`); return { results, errorCount: stats.errorCount, warningCount: stats.warningCount, fixableErrorCount: stats.fixableErrorCount, fixableWarningCount: stats.fixableWarningCount, usedDeprecatedRules }; } /** * Executes the current configuration on text. * @param {string} text A string of JavaScript code to lint. * @param {string} filename An optional string representing the texts filename. * @param {boolean} warnIgnored Always warn when a file is ignored * @returns {Object} The results for the linting. */ executeOnText(text, filename, warnIgnored) { const results = [], options = this.options, configHelper = this.config, ignoredPaths = new IgnoredPaths(options); // resolve filename based on options.cwd (for reporting, ignoredPaths also resolves) const resolvedFilename = filename && !path.isAbsolute(filename) ? path.resolve(options.cwd, filename) : filename; let usedDeprecatedRules; if (resolvedFilename && ignoredPaths.contains(resolvedFilename)) { if (warnIgnored) { results.push(createIgnoreResult(resolvedFilename, options.cwd)); } usedDeprecatedRules = []; } else { // if there's a cache, populate it if ("_rulesCache" in this) { this._rulesCache = this.getRules(); } const { result, config } = processText( text, configHelper, resolvedFilename, options.fix, options.allowInlineConfig, options.reportUnusedDisableDirectives, this.linter ); results.push(result); usedDeprecatedRules = createRuleDeprecationWarnings( Object.keys(config.rules).filter(rule => ConfigOps.getRuleSeverity(config.rules[rule])), this.getRules() ); } const stats = calculateStatsPerRun(results); return { results, errorCount: stats.errorCount, warningCount: stats.warningCount, fixableErrorCount: stats.fixableErrorCount, fixableWarningCount: stats.fixableWarningCount, usedDeprecatedRules }; } /** * Returns a configuration object for the given file based on the CLI options. * This is the same logic used by the ESLint CLI executable to determine * configuration for each file it processes. * @param {string} filePath The path of the file to retrieve a config object for. * @returns {Object} A configuration object for the file. */ getConfigForFile(filePath) { const configHelper = this.config; return configHelper.getConfig(filePath); } /** * Checks if a given path is ignored by ESLint. * @param {string} filePath The path of the file to check. * @returns {boolean} Whether or not the given path is ignored. */ isPathIgnored(filePath) { const resolvedPath = path.resolve(this.options.cwd, filePath); const ignoredPaths = new IgnoredPaths(this.options); return ignoredPaths.contains(resolvedPath); } /** * Returns the formatter representing the given format or null if no formatter * with the given name can be found. * @param {string} [format] The name of the format to load or the path to a * custom formatter. * @returns {Function} The formatter function or null if not found. */ getFormatter(format) { // default is stylish const resolvedFormatName = format || "stylish"; // only strings are valid formatters if (typeof resolvedFormatName === "string") { // replace \ with / for Windows compatibility const normalizedFormatName = resolvedFormatName.replace(/\\/g, "/"); const cwd = this.options ? this.options.cwd : process.cwd(); const namespace = naming.getNamespaceFromTerm(normalizedFormatName); let formatterPath; // if there's a slash, then it's a file if (!namespace && normalizedFormatName.indexOf("/") > -1) { formatterPath = path.resolve(cwd, normalizedFormatName); } else { try { const npmFormat = naming.normalizePackageName(normalizedFormatName, "eslint-formatter"); formatterPath = resolver.resolve(npmFormat, `${cwd}/node_modules`); } catch (e) { formatterPath = `./formatters/${normalizedFormatName}`; } } try { return require(formatterPath); } catch (ex) { ex.message = `There was a problem loading formatter: ${formatterPath}\nError: ${ex.message}`; throw ex; } } else { return null; } } } CLIEngine.version = pkg.version; CLIEngine.getFormatter = CLIEngine.prototype.getFormatter; module.exports = CLIEngine;