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