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Viewing file:     translate-cli-options.js (7.36 KB)      -rw-r--r--

/**
 * @fileoverview Translates CLI options into ESLint constructor options.
 * @author Nicholas C. Zakas
 * @author Francesco Trotta
 */

"use strict";

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

const { normalizeSeverityToString } = require("./severity");
const { getShorthandName, normalizePackageName } = require("./naming");
const { ModuleImporter } = require("@humanwhocodes/module-importer");

//------------------------------------------------------------------------------
// Types
//------------------------------------------------------------------------------

/** @typedef {import("../types").ESLint.Options} ESLintOptions */
/** @typedef {import("../types").ESLint.LegacyOptions} LegacyESLintOptions */
/** @typedef {import("../types").Linter.LintMessage} LintMessage */
/** @typedef {import("../options").ParsedCLIOptions} ParsedCLIOptions */
/** @typedef {import("../types").ESLint.Plugin} Plugin */

//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------

/**
 * Loads plugins with the specified names.
 * @param {{ "import": (name: string) => Promise<any> }} importer An object with an `import` method called once for each plugin.
 * @param {string[]} pluginNames The names of the plugins to be loaded, with or without the "eslint-plugin-" prefix.
 * @returns {Promise<Record<string, Plugin>>} A mapping of plugin short names to implementations.
 */
async function loadPlugins(importer, pluginNames) {
	const plugins = {};

	await Promise.all(
		pluginNames.map(async pluginName => {
			const longName = normalizePackageName(pluginName, "eslint-plugin");
			const module = await importer.import(longName);

			if (!("default" in module)) {
				throw new Error(
					`"${longName}" cannot be used with the \`--plugin\` option because its default module does not provide a \`default\` export`,
				);
			}

			const shortName = getShorthandName(pluginName, "eslint-plugin");

			plugins[shortName] = module.default;
		}),
	);

	return plugins;
}

/**
 * Predicate function for whether or not to apply fixes in quiet mode.
 * If a message is a warning, do not apply a fix.
 * @param {LintMessage} message The lint result.
 * @returns {boolean} True if the lint message is an error (and thus should be
 * autofixed), false otherwise.
 */
function quietFixPredicate(message) {
	return message.severity === 2;
}

/**
 * Predicate function for whether or not to run a rule in quiet mode.
 * If a rule is set to warning, do not run it.
 * @param {{ ruleId: string; severity: number; }} rule The rule id and severity.
 * @returns {boolean} True if the lint rule should run, false otherwise.
 */
function quietRuleFilter(rule) {
	return rule.severity === 2;
}

//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------

/**
 * Translates the CLI options into the options expected by the ESLint constructor.
 * @param {ParsedCLIOptions} cliOptions The CLI options to translate.
 * @param {"flat"|"eslintrc"} [configType="eslintrc"] The format of the config to generate.
 * @returns {Promise<ESLintOptions | LegacyESLintOptions>} The options object for the ESLint constructor.
 */
async function translateOptions(
	{
		cache,
		cacheFile,
		cacheLocation,
		cacheStrategy,
		concurrency,
		config,
		configLookup,
		env,
		errorOnUnmatchedPattern,
		eslintrc,
		ext,
		fix,
		fixDryRun,
		fixType,
		flag,
		global,
		ignore,
		ignorePath,
		ignorePattern,
		inlineConfig,
		parser,
		parserOptions,
		plugin,
		quiet,
		reportUnusedDisableDirectives,
		reportUnusedDisableDirectivesSeverity,
		reportUnusedInlineConfigs,
		resolvePluginsRelativeTo,
		rule,
		rulesdir,
		stats,
		warnIgnored,
		passOnNoPatterns,
		maxWarnings,
	},
	configType,
) {
	let overrideConfig, overrideConfigFile;
	const importer = new ModuleImporter();

	if (configType === "flat") {
		overrideConfigFile =
			typeof config === "string" ? config : !configLookup;
		if (overrideConfigFile === false) {
			overrideConfigFile = void 0;
		}

		const languageOptions = {};

		if (global) {
			languageOptions.globals = global.reduce((obj, name) => {
				if (name.endsWith(":true")) {
					obj[name.slice(0, -5)] = "writable";
				} else {
					obj[name] = "readonly";
				}
				return obj;
			}, {});
		}

		if (parserOptions) {
			languageOptions.parserOptions = parserOptions;
		}

		if (parser) {
			languageOptions.parser = await importer.import(parser);
		}

		overrideConfig = [
			{
				...(Object.keys(languageOptions).length > 0
					? { languageOptions }
					: {}),
				rules: rule ? rule : {},
			},
		];

		if (
			reportUnusedDisableDirectives ||
			reportUnusedDisableDirectivesSeverity !== void 0
		) {
			overrideConfig[0].linterOptions = {
				reportUnusedDisableDirectives: reportUnusedDisableDirectives
					? "error"
					: normalizeSeverityToString(
							reportUnusedDisableDirectivesSeverity,
						),
			};
		}

		if (reportUnusedInlineConfigs !== void 0) {
			overrideConfig[0].linterOptions = {
				...overrideConfig[0].linterOptions,
				reportUnusedInlineConfigs: normalizeSeverityToString(
					reportUnusedInlineConfigs,
				),
			};
		}

		if (plugin) {
			overrideConfig[0].plugins = await loadPlugins(importer, plugin);
		}

		if (ext) {
			overrideConfig.push({
				files: ext.map(
					extension =>
						`**/*${extension.startsWith(".") ? "" : "."}${extension}`,
				),
			});
		}
	} else {
		overrideConfigFile = config;

		overrideConfig = {
			env:
				env &&
				env.reduce((obj, name) => {
					obj[name] = true;
					return obj;
				}, {}),
			globals:
				global &&
				global.reduce((obj, name) => {
					if (name.endsWith(":true")) {
						obj[name.slice(0, -5)] = "writable";
					} else {
						obj[name] = "readonly";
					}
					return obj;
				}, {}),
			ignorePatterns: ignorePattern,
			parser,
			parserOptions,
			plugins: plugin,
			rules: rule,
		};
	}

	const options = {
		allowInlineConfig: inlineConfig,
		cache,
		cacheLocation: cacheLocation || cacheFile,
		cacheStrategy,
		errorOnUnmatchedPattern,
		fix: (fix || fixDryRun) && (quiet ? quietFixPredicate : true),
		fixTypes: fixType,
		ignore,
		overrideConfig,
		overrideConfigFile,
		passOnNoPatterns,
	};

	if (configType === "flat") {
		options.concurrency = concurrency;
		options.flags = flag;
		options.ignorePatterns = ignorePattern;
		options.stats = stats;
		options.warnIgnored = warnIgnored;

		/*
		 * For performance reasons rules not marked as 'error' are filtered out in quiet mode. As maxWarnings
		 * requires rules set to 'warn' to be run, we only filter out 'warn' rules if maxWarnings is not specified.
		 */
		options.ruleFilter =
			quiet && maxWarnings === -1 ? quietRuleFilter : () => true;
	} else {
		options.resolvePluginsRelativeTo = resolvePluginsRelativeTo;
		options.rulePaths = rulesdir;
		options.useEslintrc = eslintrc;
		options.extensions = ext;
		options.ignorePath = ignorePath;
		if (
			reportUnusedDisableDirectives ||
			reportUnusedDisableDirectivesSeverity !== void 0
		) {
			options.reportUnusedDisableDirectives =
				reportUnusedDisableDirectives
					? "error"
					: normalizeSeverityToString(
							reportUnusedDisableDirectivesSeverity,
						);
		}
	}

	return options;
}

module.exports = translateOptions;