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/**
* @fileoverview Main CLI object.
* @author Nicholas C. Zakas
*/
"use strict";
/*
* NOTE: 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("node:fs"),
{ mkdir, stat, writeFile } = require("node:fs/promises"),
path = require("node:path"),
{ pathToFileURL } = require("node:url"),
{ LegacyESLint } = require("./eslint"),
{
ESLint,
shouldUseFlatConfig,
locateConfigFileToUse,
} = require("./eslint/eslint"),
createCLIOptions = require("./options"),
log = require("./shared/logging"),
RuntimeInfo = require("./shared/runtime-info"),
translateOptions = require("./shared/translate-cli-options");
const { getCacheFile } = require("./eslint/eslint-helpers");
const { SuppressionsService } = require("./services/suppressions-service");
const debug = require("debug")("eslint:cli");
//------------------------------------------------------------------------------
// Types
//------------------------------------------------------------------------------
/** @typedef {import("./options").ParsedCLIOptions} ParsedCLIOptions */
/** @typedef {import("./types").ESLint.LintResult} LintResult */
/** @typedef {import("./types").ESLint.ResultsMeta} ResultsMeta */
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Count error messages.
* @param {LintResult[]} results The lint results.
* @returns {{errorCount:number;fatalErrorCount:number,warningCount:number}} The number of error messages.
*/
function countErrors(results) {
let errorCount = 0;
let fatalErrorCount = 0;
let warningCount = 0;
for (const result of results) {
errorCount += result.errorCount;
fatalErrorCount += result.fatalErrorCount;
warningCount += result.warningCount;
}
return { errorCount, fatalErrorCount, warningCount };
}
/**
* Creates an options module from the provided CLI options and encodes it as a data URL.
* @param {ParsedCLIOptions} options The CLI options.
* @returns {URL} The URL of the options module.
*/
function createOptionsModule(options) {
const translateOptionsFileURL = new URL(
"./shared/translate-cli-options.js",
pathToFileURL(__filename),
).href;
const optionsSrc =
`import translateOptions from ${JSON.stringify(translateOptionsFileURL)};\n` +
`export default await translateOptions(${JSON.stringify(options)}, "flat");\n`;
// Base64 encoding is typically shorter than URL encoding
return new URL(
`data:text/javascript;base64,${Buffer.from(optionsSrc).toString("base64")}`,
);
}
/**
* Check if a given file path is a directory or not.
* @param {string} filePath The path to a file to check.
* @returns {Promise<boolean>} `true` if the given path is a directory.
*/
async function isDirectory(filePath) {
try {
return (await stat(filePath)).isDirectory();
} catch (error) {
if (error.code === "ENOENT" || error.code === "ENOTDIR") {
return false;
}
throw error;
}
}
/**
* Outputs the results of the linting.
* @param {ESLint} engine The ESLint instance to use.
* @param {LintResult[]} results The results to print.
* @param {string} format The name of the formatter to use or the path to the formatter.
* @param {string} outputFile The path for the output file.
* @param {ResultsMeta} resultsMeta Warning count and max threshold.
* @returns {Promise<boolean>} True if the printing succeeds, false if not.
* @private
*/
async function printResults(engine, results, format, outputFile, resultsMeta) {
let formatter;
try {
formatter = await engine.loadFormatter(format);
} catch (e) {
log.error(e.message);
return false;
}
const output = await formatter.format(results, resultsMeta);
if (outputFile) {
const filePath = path.resolve(process.cwd(), outputFile);
if (await isDirectory(filePath)) {
log.error(
"Cannot write to output file path, it is a directory: %s",
outputFile,
);
return false;
}
try {
await mkdir(path.dirname(filePath), { recursive: true });
await writeFile(filePath, output);
} catch (ex) {
log.error("There was a problem writing the output file:\n%s", ex);
return false;
}
} else if (output) {
log.info(output);
}
return true;
}
/**
* Validates the `--concurrency` flag value.
* @param {string} concurrency The `--concurrency` flag value to validate.
* @returns {void}
* @throws {Error} If the `--concurrency` flag value is invalid.
*/
function validateConcurrency(concurrency) {
if (
concurrency === void 0 ||
concurrency === "auto" ||
concurrency === "off"
) {
return;
}
const concurrencyValue = Number(concurrency);
if (!Number.isInteger(concurrencyValue) || concurrencyValue < 1) {
throw new Error(
`Option concurrency: '${concurrency}' is not a positive integer, 'auto' or 'off'.`,
);
}
}
//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------
/**
* Encapsulates all CLI behavior for eslint. Makes it easier to test as well as
* for other Node.js programs to effectively run the CLI.
*/
const cli = {
/**
* Calculates the command string for the --inspect-config operation.
* @param {string} configFile The path to the config file to inspect.
* @returns {Promise<string>} The command string to execute.
*/
async calculateInspectConfigFlags(configFile) {
// find the config file
const { configFilePath, basePath } = await locateConfigFileToUse({
cwd: process.cwd(),
configFile,
});
return ["--config", configFilePath, "--basePath", basePath];
},
/**
* Executes the CLI based on an array of arguments that is passed in.
* @param {string|Array|Object} args The arguments to process.
* @param {string} [text] The text to lint (used for TTY).
* @param {boolean} [allowFlatConfig=true] Whether or not to allow flat config.
* @returns {Promise<number>} The exit code for the operation.
*/
async execute(args, text, allowFlatConfig = true) {
if (Array.isArray(args)) {
debug("CLI args: %o", args.slice(2));
}
/*
* Before doing anything, we need to see if we are using a
* flat config file. If so, then we need to change the way command
* line args are parsed. This is temporary, and when we fully
* switch to flat config we can remove this logic.
*/
const usingFlatConfig =
allowFlatConfig && (await shouldUseFlatConfig());
debug("Using flat config?", usingFlatConfig);
if (allowFlatConfig && !usingFlatConfig) {
const { WarningService } = require("./services/warning-service");
new WarningService().emitESLintRCWarning();
}
const CLIOptions = createCLIOptions(usingFlatConfig);
/** @type {ParsedCLIOptions} */
let options;
try {
options = CLIOptions.parse(args);
validateConcurrency(options.concurrency);
} catch (error) {
debug("Error parsing CLI options:", error.message);
let errorMessage = error.message;
if (usingFlatConfig) {
errorMessage +=
"\nYou're using eslint.config.js, some command line flags are no longer available. Please see https://eslint.org/docs/latest/use/command-line-interface for details.";
}
log.error(errorMessage);
return 2;
}
const files = options._;
const useStdin = typeof text === "string";
if (options.help) {
log.info(CLIOptions.generateHelp());
return 0;
}
if (options.version) {
log.info(RuntimeInfo.version());
return 0;
}
if (options.envInfo) {
try {
log.info(RuntimeInfo.environment());
return 0;
} catch (err) {
debug("Error retrieving environment info");
log.error(err.message);
return 2;
}
}
if (options.printConfig) {
if (files.length) {
log.error(
"The --print-config option must be used with exactly one file name.",
);
return 2;
}
if (useStdin) {
log.error(
"The --print-config option is not available for piped-in code.",
);
return 2;
}
const engine = usingFlatConfig
? new ESLint(await translateOptions(options, "flat"))
: new LegacyESLint(await translateOptions(options));
const fileConfig = await engine.calculateConfigForFile(
options.printConfig,
);
log.info(JSON.stringify(fileConfig, null, " "));
return 0;
}
if (options.inspectConfig) {
log.info(
"You can also run this command directly using 'npx @eslint/config-inspector@latest' in the same directory as your configuration file.",
);
try {
const flatOptions = await translateOptions(options, "flat");
const spawn = require("cross-spawn");
const flags = await cli.calculateInspectConfigFlags(
flatOptions.overrideConfigFile,
);
spawn.sync(
"npx",
["@eslint/config-inspector@latest", ...flags],
{ encoding: "utf8", stdio: "inherit" },
);
} catch (error) {
log.error(error);
return 2;
}
return 0;
}
debug(`Running on ${useStdin ? "text" : "files"}`);
if (options.fix && options.fixDryRun) {
log.error(
"The --fix option and the --fix-dry-run option cannot be used together.",
);
return 2;
}
if (useStdin && options.fix) {
log.error(
"The --fix option is not available for piped-in code; use --fix-dry-run instead.",
);
return 2;
}
if (options.fixType && !options.fix && !options.fixDryRun) {
log.error(
"The --fix-type option requires either --fix or --fix-dry-run.",
);
return 2;
}
if (
options.reportUnusedDisableDirectives &&
options.reportUnusedDisableDirectivesSeverity !== void 0
) {
log.error(
"The --report-unused-disable-directives option and the --report-unused-disable-directives-severity option cannot be used together.",
);
return 2;
}
if (usingFlatConfig && options.ext) {
// Passing `--ext ""` results in `options.ext` being an empty array.
if (options.ext.length === 0) {
log.error("The --ext option value cannot be empty.");
return 2;
}
// Passing `--ext ,ts` results in an empty string at index 0. Passing `--ext ts,,tsx` results in an empty string at index 1.
const emptyStringIndex = options.ext.indexOf("");
if (emptyStringIndex >= 0) {
log.error(
`The --ext option arguments cannot be empty strings. Found an empty string at index ${emptyStringIndex}.`,
);
return 2;
}
}
if (options.suppressAll && options.suppressRule) {
log.error(
"The --suppress-all option and the --suppress-rule option cannot be used together.",
);
return 2;
}
if (options.suppressAll && options.pruneSuppressions) {
log.error(
"The --suppress-all option and the --prune-suppressions option cannot be used together.",
);
return 2;
}
if (options.suppressRule && options.pruneSuppressions) {
log.error(
"The --suppress-rule option and the --prune-suppressions option cannot be used together.",
);
return 2;
}
if (
useStdin &&
(options.suppressAll ||
options.suppressRule ||
options.pruneSuppressions)
) {
log.error(
"The --suppress-all, --suppress-rule, and --prune-suppressions options cannot be used with piped-in code.",
);
return 2;
}
const ActiveESLint = usingFlatConfig ? ESLint : LegacyESLint;
/** @type {ESLint|LegacyESLint} */
let engine;
if (options.concurrency && options.concurrency !== "off") {
const optionsURL = createOptionsModule(options);
engine = await ESLint.fromOptionsModule(optionsURL);
} else {
const eslintOptions = await translateOptions(
options,
usingFlatConfig ? "flat" : "eslintrc",
);
engine = new ActiveESLint(eslintOptions);
}
let results;
if (useStdin) {
results = await engine.lintText(text, {
filePath: options.stdinFilename,
// flatConfig respects CLI flag and constructor warnIgnored, eslintrc forces true for backwards compatibility
warnIgnored: usingFlatConfig ? void 0 : true,
});
} else {
results = await engine.lintFiles(files);
}
if (options.fix) {
debug("Fix mode enabled - applying fixes");
await ActiveESLint.outputFixes(results);
}
let unusedSuppressions = {};
if (!useStdin) {
const suppressionsFileLocation = getCacheFile(
options.suppressionsLocation || "eslint-suppressions.json",
process.cwd(),
{
prefix: "suppressions_",
},
);
if (
options.suppressionsLocation &&
!fs.existsSync(suppressionsFileLocation) &&
!options.suppressAll &&
!options.suppressRule
) {
log.error(
"The suppressions file does not exist. Please run the command with `--suppress-all` or `--suppress-rule` to create it.",
);
return 2;
}
if (
options.suppressAll ||
options.suppressRule ||
options.pruneSuppressions ||
fs.existsSync(suppressionsFileLocation)
) {
const suppressions = new SuppressionsService({
filePath: suppressionsFileLocation,
cwd: process.cwd(),
});
if (options.suppressAll || options.suppressRule) {
await suppressions.suppress(results, options.suppressRule);
}
if (options.pruneSuppressions) {
await suppressions.prune(results);
}
const suppressionResults = suppressions.applySuppressions(
results,
await suppressions.load(),
);
results = suppressionResults.results;
unusedSuppressions = suppressionResults.unused;
}
}
let resultsToPrint = results;
if (options.quiet) {
debug("Quiet mode enabled - filtering out warnings");
resultsToPrint = ActiveESLint.getErrorResults(resultsToPrint);
}
const resultCounts = countErrors(results);
const tooManyWarnings =
options.maxWarnings >= 0 &&
resultCounts.warningCount > options.maxWarnings;
const resultsMeta = tooManyWarnings
? {
maxWarningsExceeded: {
maxWarnings: options.maxWarnings,
foundWarnings: resultCounts.warningCount,
},
}
: {};
if (
await printResults(
engine,
resultsToPrint,
options.format,
options.outputFile,
resultsMeta,
)
) {
// Errors and warnings from the original unfiltered results should determine the exit code
const shouldExitForFatalErrors =
options.exitOnFatalError && resultCounts.fatalErrorCount > 0;
if (!resultCounts.errorCount && tooManyWarnings) {
log.error(
"ESLint found too many warnings (maximum: %s).",
options.maxWarnings,
);
}
if (!options.passOnUnprunedSuppressions) {
const unusedSuppressionsCount =
Object.keys(unusedSuppressions).length;
if (unusedSuppressionsCount > 0) {
log.error(
"There are suppressions left that do not occur anymore. Consider re-running the command with `--prune-suppressions`.",
);
debug(JSON.stringify(unusedSuppressions, null, 2));
return 2;
}
}
if (shouldExitForFatalErrors) {
return 2;
}
return resultCounts.errorCount || tooManyWarnings ? 1 : 0;
}
return 2;
},
};
module.exports = cli;