/**
* @fileoverview Config initialization wizard.
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const util = require("util"),
path = require("path"),
enquirer = require("enquirer"),
ProgressBar = require("progress"),
semver = require("semver"),
espree = require("espree"),
recConfig = require("../../conf/eslint-recommended"),
ConfigOps = require("@eslint/eslintrc/lib/shared/config-ops"),
log = require("../shared/logging"),
naming = require("@eslint/eslintrc/lib/shared/naming"),
ModuleResolver = require("../shared/relative-module-resolver"),
autoconfig = require("./autoconfig.js"),
ConfigFile = require("./config-file"),
npmUtils = require("./npm-utils"),
{ getSourceCodeOfFiles } = require("./source-code-utils");
const debug = require("debug")("eslint:config-initializer");
//------------------------------------------------------------------------------
// Private
//------------------------------------------------------------------------------
/* istanbul ignore next: hard to test fs function */
/**
* Create .eslintrc file in the current working directory
* @param {Object} config object that contains user's answers
* @param {string} format The file format to write to.
* @returns {void}
*/
function writeFile(config, format) {
// default is .js
let extname = ".js";
if (format === "YAML") {
extname = ".yml";
} else if (format === "JSON") {
extname = ".json";
}
const installedESLint = config.installedESLint;
delete config.installedESLint;
ConfigFile.write(config, `./.eslintrc${extname}`);
log.info(`Successfully created .eslintrc${extname} file in ${process.cwd()}`);
if (installedESLint) {
log.info("ESLint was installed locally. We recommend using this local copy instead of your globally-installed copy.");
}
}
/**
* Get the peer dependencies of the given module.
* This adds the gotten value to cache at the first time, then reuses it.
* In a process, this function is called twice, but `npmUtils.fetchPeerDependencies` needs to access network which is relatively slow.
* @param {string} moduleName The module name to get.
* @returns {Object} The peer dependencies of the given module.
* This object is the object of `peerDependencies` field of `package.json`.
* Returns null if npm was not found.
*/
function getPeerDependencies(moduleName) {
let result = getPeerDependencies.cache.get(moduleName);
if (!result) {
log.info(`Checking peerDependencies of ${moduleName}`);
result = npmUtils.fetchPeerDependencies(moduleName);
getPeerDependencies.cache.set(moduleName, result);
}
return result;
}
getPeerDependencies.cache = new Map();
/**
* Return necessary plugins, configs, parsers, etc. based on the config
* @param {Object} config config object
* @param {boolean} [installESLint=true] If `false` is given, it does not install eslint.
* @returns {string[]} An array of modules to be installed.
*/
function getModulesList(config, installESLint) {
const modules = {};
// Create a list of modules which should be installed based on config
if (config.plugins) {
for (const plugin of config.plugins) {
const moduleName = naming.normalizePackageName(plugin, "eslint-plugin");
modules[moduleName] = "latest";
}
}
if (config.extends) {
const extendList = Array.isArray(config.extends) ? config.extends : [config.extends];
for (const extend of extendList) {
if (extend.startsWith("eslint:") || extend.startsWith("plugin:")) {
continue;
}
const moduleName = naming.normalizePackageName(extend, "eslint-config");
modules[moduleName] = "latest";
Object.assign(
modules,
getPeerDependencies(`${moduleName}@latest`)
);
}
}
const parser = config.parser || (config.parserOptions && config.parserOptions.parser);
if (parser) {
modules[parser] = "latest";
}
if (installESLint === false) {
delete modules.eslint;
} else {
const installStatus = npmUtils.checkDevDeps(["eslint"]);
// Mark to show messages if it's new installation of eslint.
if (installStatus.eslint === false) {
log.info("Local ESLint installation not found.");
modules.eslint = modules.eslint || "latest";
config.installedESLint = true;
}
}
return Object.keys(modules).map(name => `${name}@${modules[name]}`);
}
/**
* Set the `rules` of a config by examining a user's source code
*
* Note: This clones the config object and returns a new config to avoid mutating
* the original config parameter.
* @param {Object} answers answers received from enquirer
* @param {Object} config config object
* @returns {Object} config object with configured rules
*/
function configureRules(answers, config) {
const BAR_TOTAL = 20,
BAR_SOURCE_CODE_TOTAL = 4,
newConfig = Object.assign({}, config),
disabledConfigs = {};
let sourceCodes,
registry;
// Set up a progress bar, as this process can take a long time
const bar = new ProgressBar("Determining Config: :percent [:bar] :elapseds elapsed, eta :etas ", {
width: 30,
total: BAR_TOTAL
});
bar.tick(0); // Shows the progress bar
// Get the SourceCode of all chosen files
const patterns = answers.patterns.split(/[\s]+/u);
try {
sourceCodes = getSourceCodeOfFiles(patterns, { baseConfig: newConfig, useEslintrc: false }, total => {
bar.tick((BAR_SOURCE_CODE_TOTAL / total));
});
} catch (e) {
log.info("\n");
throw e;
}
const fileQty = Object.keys(sourceCodes).length;
if (fileQty === 0) {
log.info("\n");
throw new Error("Automatic Configuration failed. No files were able to be parsed.");
}
// Create a registry of rule configs
registry = new autoconfig.Registry();
registry.populateFromCoreRules();
// Lint all files with each rule config in the registry
registry = registry.lintSourceCode(sourceCodes, newConfig, total => {
bar.tick((BAR_TOTAL - BAR_SOURCE_CODE_TOTAL) / total); // Subtract out ticks used at beginning
});
debug(`\nRegistry: ${util.inspect(registry.rules, { depth: null })}`);
// Create a list of recommended rules, because we don't want to disable them
const recRules = Object.keys(recConfig.rules).filter(ruleId => ConfigOps.isErrorSeverity(recConfig.rules[ruleId]));
// Find and disable rules which had no error-free configuration
const failingRegistry = registry.getFailingRulesRegistry();
Object.keys(failingRegistry.rules).forEach(ruleId => {
// If the rule is recommended, set it to error, otherwise disable it
disabledConfigs[ruleId] = (recRules.indexOf(ruleId) !== -1) ? 2 : 0;
});
// Now that we know which rules to disable, strip out configs with errors
registry = registry.stripFailingConfigs();
/*
* If there is only one config that results in no errors for a rule, we should use it.
* createConfig will only add rules that have one configuration in the registry.
*/
const singleConfigs = registry.createConfig().rules;
/*
* The "sweet spot" for number of options in a config seems to be two (severity plus one option).
* Very often, a third option (usually an object) is available to address
* edge cases, exceptions, or unique situations. We will prefer to use a config with
* specificity of two.
*/
const specTwoConfigs = registry.filterBySpecificity(2).createConfig().rules;
// Maybe a specific combination using all three options works
const specThreeConfigs = registry.filterBySpecificity(3).createConfig().rules;
// If all else fails, try to use the default (severity only)
const defaultConfigs = registry.filterBySpecificity(1).createConfig().rules;
// Combine configs in reverse priority order (later take precedence)
newConfig.rules = Object.assign({}, disabledConfigs, defaultConfigs, specThreeConfigs, specTwoConfigs, singleConfigs);
// Make sure progress bar has finished (floating point rounding)
bar.update(BAR_TOTAL);
// Log out some stats to let the user know what happened
const finalRuleIds = Object.keys(newConfig.rules);
const totalRules = finalRuleIds.length;
const enabledRules = finalRuleIds.filter(ruleId => (newConfig.rules[ruleId] !== 0)).length;
const resultMessage = [
`\nEnabled ${enabledRules} out of ${totalRules}`,
`rules based on ${fileQty}`,
`file${(fileQty === 1) ? "." : "s."}`
].join(" ");
log.info(resultMessage);
ConfigOps.normalizeToStrings(newConfig);
return newConfig;
}
/**
* process user's answers and create config object
* @param {Object} answers answers received from enquirer
* @returns {Object} config object
*/
function processAnswers(answers) {
let config = {
rules: {},
env: {},
parserOptions: {},
extends: []
};
config.parserOptions.ecmaVersion = espree.latestEcmaVersion;
config.env.es2021 = true;
// set the module type
if (answers.moduleType === "esm") {
config.parserOptions.sourceType = "module";
} else if (answers.moduleType === "commonjs") {
config.env.commonjs = true;
}
// add in browser and node environments if necessary
answers.env.forEach(env => {
config.env[env] = true;
});
// add in library information
if (answers.framework === "react") {
config.parserOptions.ecmaFeatures = {
jsx: true
};
config.plugins = ["react"];
config.extends.push("plugin:react/recommended");
} else if (answers.framework === "vue") {
config.plugins = ["vue"];
config.extends.push("plugin:vue/essential");
}
if (answers.typescript) {
if (answers.framework === "vue") {
config.parserOptions.parser = "@typescript-eslint/parser";
} else {
config.parser = "@typescript-eslint/parser";
}
if (Array.isArray(config.plugins)) {
config.plugins.push("@typescript-eslint");
} else {
config.plugins = ["@typescript-eslint"];
}
}
// setup rules based on problems/style enforcement preferences
if (answers.purpose === "problems") {
config.extends.unshift("eslint:recommended");
} else if (answers.purpose === "style") {
if (answers.source === "prompt") {
config.extends.unshift("eslint:recommended");
config.rules.indent = ["error", answers.indent];
config.rules.quotes = ["error", answers.quotes];
config.rules["linebreak-style"] = ["error", answers.linebreak];
config.rules.semi = ["error", answers.semi ? "always" : "never"];
} else if (answers.source === "auto") {
config = configureRules(answers, config);
config = autoconfig.extendFromRecommended(config);
}
}
if (answers.typescript && config.extends.includes("eslint:recommended")) {
config.extends.push("plugin:@typescript-eslint/recommended");
}
// normalize extends
if (config.extends.length === 0) {
delete config.extends;
} else if (config.extends.length === 1) {
config.extends = config.extends[0];
}
ConfigOps.normalizeToStrings(config);
return config;
}
/**
* Get the version of the local ESLint.
* @returns {string|null} The version. If the local ESLint was not found, returns null.
*/
function getLocalESLintVersion() {
try {
const eslintPath = ModuleResolver.resolve("eslint", path.join(process.cwd(), "__placeholder__.js"));
const eslint = require(eslintPath);
return eslint.linter.version || null;
} catch {
return null;
}
}
/**
* Get the shareable config name of the chosen style guide.
* @param {Object} answers The answers object.
* @returns {string} The shareable config name.
*/
function getStyleGuideName(answers) {
if (answers.styleguide === "airbnb" && answers.framework !== "react") {
return "airbnb-base";
}
return answers.styleguide;
}
/**
* Check whether the local ESLint version conflicts with the required version of the chosen shareable config.
* @param {Object} answers The answers object.
* @returns {boolean} `true` if the local ESLint is found then it conflicts with the required version of the chosen shareable config.
*/
function hasESLintVersionConflict(answers) {
// Get the local ESLint version.
const localESLintVersion = getLocalESLintVersion();
if (!localESLintVersion) {
return false;
}
// Get the required range of ESLint version.
const configName = getStyleGuideName(answers);
const moduleName = `eslint-config-${configName}@latest`;
const peerDependencies = getPeerDependencies(moduleName) || {};
const requiredESLintVersionRange = peerDependencies.eslint;
if (!requiredESLintVersionRange) {
return false;
}
answers.localESLintVersion = localESLintVersion;
answers.requiredESLintVersionRange = requiredESLintVersionRange;
// Check the version.
if (semver.satisfies(localESLintVersion, requiredESLintVersionRange)) {
answers.installESLint = false;
return false;
}
return true;
}
/**
* Install modules.
* @param {string[]} modules Modules to be installed.
* @returns {void}
*/
function installModules(modules) {
log.info(`Installing ${modules.join(", ")}`);
npmUtils.installSyncSaveDev(modules);
}
/* istanbul ignore next: no need to test enquirer */
/**
* Ask user to install modules.
* @param {string[]} modules Array of modules to be installed.
* @param {boolean} packageJsonExists Indicates if package.json is existed.
* @returns {Promise} Answer that indicates if user wants to install.
*/
function askInstallModules(modules, packageJsonExists) {
// If no modules, do nothing.
if (modules.length === 0) {
return Promise.resolve();
}
log.info("The config that you've selected requires the following dependencies:\n");
log.info(modules.join(" "));
return enquirer.prompt([
{
type: "toggle",
name: "executeInstallation",
message: "Would you like to install them now with npm?",
enabled: "Yes",
disabled: "No",
initial: 1,
skip() {
return !(modules.length && packageJsonExists);
},
result(input) {
return this.skipped ? null : input;
}
}
]).then(({ executeInstallation }) => {
if (executeInstallation) {
installModules(modules);
}
});
}
/* istanbul ignore next: no need to test enquirer */
/**
* Ask use a few questions on command prompt
* @returns {Promise} The promise with the result of the prompt
*/
function promptUser() {
return enquirer.prompt([
{
type: "select",
name: "purpose",
message: "How would you like to use ESLint?",
// The returned number matches the name value of nth in the choices array.
initial: 1,
choices: [
{ message: "To check syntax only", name: "syntax" },
{ message: "To check syntax and find problems", name: "problems" },
{ message: "To check syntax, find problems, and enforce code style", name: "style" }
]
},
{
type: "select",
name: "moduleType",
message: "What type of modules does your project use?",
initial: 0,
choices: [
{ message: "JavaScript modules (import/export)", name: "esm" },
{ message: "CommonJS (require/exports)", name: "commonjs" },
{ message: "None of these", name: "none" }
]
},
{
type: "select",
name: "framework",
message: "Which framework does your project use?",
initial: 0,
choices: [
{ message: "React", name: "react" },
{ message: "Vue.js", name: "vue" },
{ message: "None of these", name: "none" }
]
},
{
type: "toggle",
name: "typescript",
message: "Does your project use TypeScript?",
enabled: "Yes",
disabled: "No",
initial: 0
},
{
type: "multiselect",
name: "env",
message: "Where does your code run?",
hint: "(Press <space> to select, <a> to toggle all, <i> to invert selection)",
initial: 0,
choices: [
{ message: "Browser", name: "browser" },
{ message: "Node", name: "node" }
]
},
{
type: "select",
name: "source",
message: "How would you like to define a style for your project?",
choices: [
{ message: "Use a popular style guide", name: "guide" },
{ message: "Answer questions about your style", name: "prompt" },
{ message: "Inspect your JavaScript file(s)", name: "auto" }
],
skip() {
return this.state.answers.purpose !== "style";
},
result(input) {
return this.skipped ? null : input;
}
},
{
type: "select",
name: "styleguide",
message: "Which style guide do you want to follow?",
choices: [
{ message: "Airbnb: https://github.com/airbnb/javascript", name: "airbnb" },
{ message: "Standard: https://github.com/standard/standard", name: "standard" },
{ message: "Google: https://github.com/google/eslint-config-google", name: "google" }
],
skip() {
this.state.answers.packageJsonExists = npmUtils.checkPackageJson();
return !(this.state.answers.source === "guide" && this.state.answers.packageJsonExists);
},
result(input) {
return this.skipped ? null : input;
}
},
{
type: "input",
name: "patterns",
message: "Which file(s), path(s), or glob(s) should be examined?",
skip() {
return this.state.answers.source !== "auto";
},
validate(input) {
if (!this.skipped && input.trim().length === 0 && input.trim() !== ",") {
return "You must tell us what code to examine. Try again.";
}
return true;
}
},
{
type: "select",
name: "format",
message: "What format do you want your config file to be in?",
initial: 0,
choices: ["JavaScript", "YAML", "JSON"]
},
{
type: "toggle",
name: "installESLint",
message() {
const { answers } = this.state;
const verb = semver.ltr(answers.localESLintVersion, answers.requiredESLintVersionRange)
? "upgrade"
: "downgrade";
return `The style guide "${answers.styleguide}" requires eslint@${answers.requiredESLintVersionRange}. You are currently using eslint@${answers.localESLintVersion}.\n Do you want to ${verb}?`;
},
enabled: "Yes",
disabled: "No",
initial: 1,
skip() {
return !(this.state.answers.source === "guide" && this.state.answers.packageJsonExists && hasESLintVersionConflict(this.state.answers));
},
result(input) {
return this.skipped ? null : input;
}
}
]).then(earlyAnswers => {
// early exit if no style guide is necessary
if (earlyAnswers.purpose !== "style") {
const config = processAnswers(earlyAnswers);
const modules = getModulesList(config);
return askInstallModules(modules, earlyAnswers.packageJsonExists)
.then(() => writeFile(config, earlyAnswers.format));
}
// early exit if you are using a style guide
if (earlyAnswers.source === "guide") {
if (!earlyAnswers.packageJsonExists) {
log.info("A package.json is necessary to install plugins such as style guides. Run `npm init` to create a package.json file and try again.");
return void 0;
}
if (earlyAnswers.installESLint === false && !semver.satisfies(earlyAnswers.localESLintVersion, earlyAnswers.requiredESLintVersionRange)) {
log.info(`Note: it might not work since ESLint's version is mismatched with the ${earlyAnswers.styleguide} config.`);
}
if (earlyAnswers.styleguide === "airbnb" && earlyAnswers.framework !== "react") {
earlyAnswers.styleguide = "airbnb-base";
}
const config = processAnswers(earlyAnswers);
if (Array.isArray(config.extends)) {
config.extends.push(earlyAnswers.styleguide);
} else if (config.extends) {
config.extends = [config.extends, earlyAnswers.styleguide];
} else {
config.extends = [earlyAnswers.styleguide];
}
const modules = getModulesList(config);
return askInstallModules(modules, earlyAnswers.packageJsonExists)
.then(() => writeFile(config, earlyAnswers.format));
}
if (earlyAnswers.source === "auto") {
const combinedAnswers = Object.assign({}, earlyAnswers);
const config = processAnswers(combinedAnswers);
const modules = getModulesList(config);
return askInstallModules(modules).then(() => writeFile(config, earlyAnswers.format));
}
// continue with the style questions otherwise...
return enquirer.prompt([
{
type: "select",
name: "indent",
message: "What style of indentation do you use?",
initial: 0,
choices: [{ message: "Tabs", name: "tab" }, { message: "Spaces", name: 4 }]
},
{
type: "select",
name: "quotes",
message: "What quotes do you use for strings?",
initial: 0,
choices: [{ message: "Double", name: "double" }, { message: "Single", name: "single" }]
},
{
type: "select",
name: "linebreak",
message: "What line endings do you use?",
initial: 0,
choices: [{ message: "Unix", name: "unix" }, { message: "Windows", name: "windows" }]
},
{
type: "toggle",
name: "semi",
message: "Do you require semicolons?",
enabled: "Yes",
disabled: "No",
initial: 1
}
]).then(answers => {
const totalAnswers = Object.assign({}, earlyAnswers, answers);
const config = processAnswers(totalAnswers);
const modules = getModulesList(config);
return askInstallModules(modules).then(() => writeFile(config, earlyAnswers.format));
});
});
}
//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------
const init = {
getModulesList,
hasESLintVersionConflict,
installModules,
processAnswers,
/* istanbul ignore next */initializeConfig() {
return promptUser();
}
};
module.exports = init;