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flat-eslint.js
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flat-eslint.js
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/**
* @fileoverview Tests for the ESLint class.
* @author Kai Cataldo
* @author Toru Nagashima
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const assert = require("assert");
const util = require("util");
const fs = require("fs");
const fsp = fs.promises;
const os = require("os");
const path = require("path");
const escapeStringRegExp = require("escape-string-regexp");
const fCache = require("file-entry-cache");
const sinon = require("sinon");
const proxyquire = require("proxyquire").noCallThru().noPreserveCache();
const shell = require("shelljs");
const hash = require("../../../lib/cli-engine/hash");
const { unIndent, createCustomTeardown } = require("../../_utils");
const { shouldUseFlatConfig } = require("../../../lib/eslint/flat-eslint");
const coreRules = require("../../../lib/rules");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Creates a directory if it doesn't already exist.
* @param {string} dirPath The path to the directory that should exist.
* @returns {void}
*/
function ensureDirectoryExists(dirPath) {
try {
fs.statSync(dirPath);
} catch {
fs.mkdirSync(dirPath);
}
}
/**
* Does nothing for a given time.
* @param {number} time Time in ms.
* @returns {void}
*/
async function sleep(time) {
await util.promisify(setTimeout)(time);
}
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
describe("FlatESLint", () => {
const examplePluginName = "eslint-plugin-example";
const examplePluginNameWithNamespace = "@eslint/eslint-plugin-example";
const examplePlugin = {
rules: {
"example-rule": require("../../fixtures/rules/custom-rule"),
"make-syntax-error": require("../../fixtures/rules/make-syntax-error-rule")
}
};
const examplePreprocessorName = "eslint-plugin-processor";
const originalDir = process.cwd();
const fixtureDir = path.resolve(fs.realpathSync(os.tmpdir()), "eslint/fixtures");
/** @type {import("../../../lib/eslint/flat-eslint").FlatESLint} */
let FlatESLint;
/**
* Returns the path inside of the fixture directory.
* @param {...string} args file path segments.
* @returns {string} The path inside the fixture directory.
* @private
*/
function getFixturePath(...args) {
const filepath = path.join(fixtureDir, ...args);
try {
return fs.realpathSync(filepath);
} catch {
return filepath;
}
}
/**
* Create the ESLint object by mocking some of the plugins
* @param {Object} options options for ESLint
* @returns {ESLint} engine object
* @private
*/
function eslintWithPlugins(options) {
return new FlatESLint({
...options,
plugins: {
[examplePluginName]: examplePlugin,
[examplePluginNameWithNamespace]: examplePlugin,
[examplePreprocessorName]: require("../../fixtures/processors/custom-processor")
}
});
}
// copy into clean area so as not to get "infected" by this project's .eslintrc files
before(function() {
/*
* GitHub Actions Windows and macOS runners occasionally exhibit
* extremely slow filesystem operations, during which copying fixtures
* exceeds the default test timeout, so raise it just for this hook.
* Mocha uses `this` to set timeouts on an individual hook level.
*/
this.timeout(60 * 1000); // eslint-disable-line no-invalid-this -- Mocha API
shell.mkdir("-p", fixtureDir);
shell.cp("-r", "./tests/fixtures/.", fixtureDir);
});
beforeEach(() => {
({ FlatESLint } = require("../../../lib/eslint/flat-eslint"));
});
after(() => {
shell.rm("-r", fixtureDir);
});
describe("ESLint constructor function", () => {
it("the default value of 'options.cwd' should be the current working directory.", async () => {
process.chdir(__dirname);
try {
const engine = new FlatESLint();
const results = await engine.lintFiles("eslint.js");
assert.strictEqual(path.dirname(results[0].filePath), __dirname);
} finally {
process.chdir(originalDir);
}
});
it("should normalize 'options.cwd'.", async () => {
const cwd = getFixturePath("example-app3");
const engine = new FlatESLint({
cwd: `${cwd}${path.sep}foo${path.sep}..`, // `<cwd>/foo/..` should be normalized to `<cwd>`
overrideConfigFile: true,
overrideConfig: {
plugins: {
test: require(path.join(cwd, "node_modules", "eslint-plugin-test"))
},
rules: {
"test/report-cwd": "error"
}
}
});
const results = await engine.lintText("");
assert.strictEqual(results[0].messages[0].ruleId, "test/report-cwd");
assert.strictEqual(results[0].messages[0].message, cwd);
const formatter = await engine.loadFormatter("cwd");
assert.strictEqual(formatter.format(results), cwd);
});
// https://github.com/eslint/eslint/issues/2380
it("should not modify baseConfig when format is specified", () => {
const customBaseConfig = { root: true };
new FlatESLint({ baseConfig: customBaseConfig }); // eslint-disable-line no-new -- Check for argument side effects
assert.deepStrictEqual(customBaseConfig, { root: true });
});
it("should throw readable messages if removed options are present", () => {
assert.throws(
() => new FlatESLint({
cacheFile: "",
configFile: "",
envs: [],
globals: [],
ignorePath: ".gitignore",
ignorePattern: [],
parser: "",
parserOptions: {},
rules: {},
plugins: [],
reportUnusedDisableDirectives: "error"
}),
new RegExp(escapeStringRegExp([
"Invalid Options:",
"- Unknown options: cacheFile, configFile, envs, globals, ignorePath, ignorePattern, parser, parserOptions, rules, reportUnusedDisableDirectives"
].join("\n")), "u")
);
});
it("should throw readable messages if wrong type values are given to options", () => {
assert.throws(
() => new FlatESLint({
allowInlineConfig: "",
baseConfig: "",
cache: "",
cacheLocation: "",
cwd: "foo",
errorOnUnmatchedPattern: "",
fix: "",
fixTypes: ["xyz"],
globInputPaths: "",
ignore: "",
ignorePatterns: "",
overrideConfig: "",
overrideConfigFile: "",
plugins: "",
warnIgnored: ""
}),
new RegExp(escapeStringRegExp([
"Invalid Options:",
"- 'allowInlineConfig' must be a boolean.",
"- 'baseConfig' must be an object or null.",
"- 'cache' must be a boolean.",
"- 'cacheLocation' must be a non-empty string.",
"- 'cwd' must be an absolute path.",
"- 'errorOnUnmatchedPattern' must be a boolean.",
"- 'fix' must be a boolean or a function.",
"- 'fixTypes' must be an array of any of \"directive\", \"problem\", \"suggestion\", and \"layout\".",
"- 'globInputPaths' must be a boolean.",
"- 'ignore' must be a boolean.",
"- 'ignorePatterns' must be an array of non-empty strings or null.",
"- 'overrideConfig' must be an object or null.",
"- 'overrideConfigFile' must be a non-empty string, null, or true.",
"- 'plugins' must be an object or null.",
"- 'warnIgnored' must be a boolean."
].join("\n")), "u")
);
});
it("should throw readable messages if 'ignorePatterns' is not an array of non-empty strings.", () => {
const invalidIgnorePatterns = [
() => {},
false,
{},
"",
"foo",
[[]],
[() => {}],
[false],
[{}],
[""],
["foo", ""],
["foo", "", "bar"],
["foo", false, "bar"]
];
invalidIgnorePatterns.forEach(ignorePatterns => {
assert.throws(
() => new FlatESLint({ ignorePatterns }),
new RegExp(escapeStringRegExp([
"Invalid Options:",
"- 'ignorePatterns' must be an array of non-empty strings or null."
].join("\n")), "u")
);
});
});
it("should throw readable messages if 'plugins' option contains empty key", () => {
assert.throws(
() => new FlatESLint({
plugins: {
"eslint-plugin-foo": {},
"eslint-plugin-bar": {},
"": {}
}
}),
new RegExp(escapeStringRegExp([
"Invalid Options:",
"- 'plugins' must not include an empty string."
].join("\n")), "u")
);
});
});
describe("lintText()", () => {
let eslint;
it("should report the total and per file errors when using local cwd eslint.config.js", async () => {
eslint = new FlatESLint({
cwd: __dirname
});
const results = await eslint.lintText("var foo = 'bar';");
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 4);
assert.strictEqual(results[0].messages[0].ruleId, "no-var");
assert.strictEqual(results[0].messages[1].ruleId, "no-unused-vars");
assert.strictEqual(results[0].messages[2].ruleId, "quotes");
assert.strictEqual(results[0].messages[3].ruleId, "eol-last");
assert.strictEqual(results[0].fixableErrorCount, 3);
assert.strictEqual(results[0].fixableWarningCount, 0);
assert.strictEqual(results[0].usedDeprecatedRules.length, 2);
assert.strictEqual(results[0].usedDeprecatedRules[0].ruleId, "quotes");
assert.strictEqual(results[0].usedDeprecatedRules[1].ruleId, "eol-last");
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should report the total and per file warnings when using local cwd .eslintrc", async () => {
eslint = new FlatESLint({
overrideConfig: {
rules: {
quotes: 1,
"no-var": 1,
"eol-last": 1,
"no-unused-vars": 1
}
},
overrideConfigFile: true
});
const results = await eslint.lintText("var foo = 'bar';");
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 4);
assert.strictEqual(results[0].messages[0].ruleId, "no-var");
assert.strictEqual(results[0].messages[1].ruleId, "no-unused-vars");
assert.strictEqual(results[0].messages[2].ruleId, "quotes");
assert.strictEqual(results[0].messages[3].ruleId, "eol-last");
assert.strictEqual(results[0].fixableErrorCount, 0);
assert.strictEqual(results[0].fixableWarningCount, 3);
assert.strictEqual(results[0].usedDeprecatedRules.length, 2);
assert.strictEqual(results[0].usedDeprecatedRules[0].ruleId, "quotes");
assert.strictEqual(results[0].usedDeprecatedRules[1].ruleId, "eol-last");
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should report one message when using specific config file", async () => {
eslint = new FlatESLint({
overrideConfigFile: "fixtures/configurations/quotes-error.js",
cwd: getFixturePath("..")
});
const results = await eslint.lintText("var foo = 'bar';");
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 1);
assert.strictEqual(results[0].messages[0].ruleId, "quotes");
assert.strictEqual(results[0].messages[0].output, void 0);
assert.strictEqual(results[0].errorCount, 1);
assert.strictEqual(results[0].fixableErrorCount, 1);
assert.strictEqual(results[0].warningCount, 0);
assert.strictEqual(results[0].fatalErrorCount, 0);
assert.strictEqual(results[0].usedDeprecatedRules.length, 1);
assert.strictEqual(results[0].usedDeprecatedRules[0].ruleId, "quotes");
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should report the filename when passed in", async () => {
eslint = new FlatESLint({
ignore: false,
cwd: getFixturePath()
});
const options = { filePath: "test.js" };
const results = await eslint.lintText("var foo = 'bar';", options);
assert.strictEqual(results[0].filePath, getFixturePath("test.js"));
});
it("should return a warning when given a filename by --stdin-filename in excluded files list if warnIgnored is true", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(".."),
overrideConfigFile: "fixtures/eslint.config_with_ignores.js"
});
const options = { filePath: "fixtures/passing.js", warnIgnored: true };
const results = await eslint.lintText("var bar = foo;", options);
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].filePath, getFixturePath("passing.js"));
assert.strictEqual(results[0].messages[0].severity, 1);
assert.strictEqual(results[0].messages[0].message, "File ignored because of a matching ignore pattern. Use \"--no-ignore\" to disable file ignore settings or use \"--no-warn-ignored\" to suppress this warning.");
assert.strictEqual(results[0].messages[0].output, void 0);
assert.strictEqual(results[0].errorCount, 0);
assert.strictEqual(results[0].warningCount, 1);
assert.strictEqual(results[0].fatalErrorCount, 0);
assert.strictEqual(results[0].fixableErrorCount, 0);
assert.strictEqual(results[0].fixableWarningCount, 0);
assert.strictEqual(results[0].usedDeprecatedRules.length, 0);
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should return a warning when given a filename by --stdin-filename in excluded files list if constructor warnIgnored is false, but lintText warnIgnored is true", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(".."),
overrideConfigFile: "fixtures/eslint.config_with_ignores.js",
warnIgnored: false
});
const options = { filePath: "fixtures/passing.js", warnIgnored: true };
const results = await eslint.lintText("var bar = foo;", options);
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].filePath, getFixturePath("passing.js"));
assert.strictEqual(results[0].messages[0].severity, 1);
assert.strictEqual(results[0].messages[0].message, "File ignored because of a matching ignore pattern. Use \"--no-ignore\" to disable file ignore settings or use \"--no-warn-ignored\" to suppress this warning.");
assert.strictEqual(results[0].messages[0].output, void 0);
assert.strictEqual(results[0].errorCount, 0);
assert.strictEqual(results[0].warningCount, 1);
assert.strictEqual(results[0].fatalErrorCount, 0);
assert.strictEqual(results[0].fixableErrorCount, 0);
assert.strictEqual(results[0].fixableWarningCount, 0);
assert.strictEqual(results[0].usedDeprecatedRules.length, 0);
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should not return a warning when given a filename by --stdin-filename in excluded files list if warnIgnored is false", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(".."),
overrideConfigFile: "fixtures/eslint.config_with_ignores.js"
});
const options = {
filePath: "fixtures/passing.js",
warnIgnored: false
};
// intentional parsing error
const results = await eslint.lintText("va r bar = foo;", options);
// should not report anything because the file is ignored
assert.strictEqual(results.length, 0);
});
it("should not return a warning when given a filename by --stdin-filename in excluded files list if constructor warnIgnored is false", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(".."),
overrideConfigFile: "fixtures/eslint.config_with_ignores.js",
warnIgnored: false
});
const options = { filePath: "fixtures/passing.js" };
const results = await eslint.lintText("var bar = foo;", options);
// should not report anything because the warning is suppressed
assert.strictEqual(results.length, 0);
});
it("should show excluded file warnings by default", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(".."),
overrideConfigFile: "fixtures/eslint.config_with_ignores.js"
});
const options = { filePath: "fixtures/passing.js" };
const results = await eslint.lintText("var bar = foo;", options);
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages[0].message, "File ignored because of a matching ignore pattern. Use \"--no-ignore\" to disable file ignore settings or use \"--no-warn-ignored\" to suppress this warning.");
});
it("should return a message when given a filename by --stdin-filename in excluded files list and ignore is off", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(".."),
ignore: false,
overrideConfigFile: "fixtures/eslint.config_with_ignores.js",
overrideConfig: {
rules: {
"no-undef": 2
}
}
});
const options = { filePath: "fixtures/passing.js" };
const results = await eslint.lintText("var bar = foo;", options);
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].filePath, getFixturePath("passing.js"));
assert.strictEqual(results[0].messages[0].ruleId, "no-undef");
assert.strictEqual(results[0].messages[0].severity, 2);
assert.strictEqual(results[0].messages[0].output, void 0);
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should return a message and fixed text when in fix mode", async () => {
eslint = new FlatESLint({
overrideConfigFile: true,
fix: true,
overrideConfig: {
rules: {
semi: 2
}
},
ignore: false,
cwd: getFixturePath()
});
const options = { filePath: "passing.js" };
const results = await eslint.lintText("var bar = foo", options);
assert.deepStrictEqual(results, [
{
filePath: getFixturePath("passing.js"),
messages: [],
suppressedMessages: [],
errorCount: 0,
warningCount: 0,
fatalErrorCount: 0,
fixableErrorCount: 0,
fixableWarningCount: 0,
output: "var bar = foo;",
usedDeprecatedRules: [
{
ruleId: "semi",
replacedBy: []
}
]
}
]);
});
it("should return a message and omit fixed text when in fix mode and fixes aren't done", async () => {
eslint = new FlatESLint({
overrideConfigFile: true,
fix: true,
overrideConfig: {
rules: {
"no-undef": 2
}
},
ignore: false,
cwd: getFixturePath()
});
const options = { filePath: "passing.js" };
const results = await eslint.lintText("var bar = foo", options);
assert.deepStrictEqual(results, [
{
filePath: getFixturePath("passing.js"),
messages: [
{
ruleId: "no-undef",
severity: 2,
messageId: "undef",
message: "'foo' is not defined.",
line: 1,
column: 11,
endLine: 1,
endColumn: 14,
nodeType: "Identifier"
}
],
suppressedMessages: [],
errorCount: 1,
warningCount: 0,
fatalErrorCount: 0,
fixableErrorCount: 0,
fixableWarningCount: 0,
source: "var bar = foo",
usedDeprecatedRules: []
}
]);
});
it("should not delete code if there is a syntax error after trying to autofix.", async () => {
eslint = eslintWithPlugins({
overrideConfigFile: true,
fix: true,
overrideConfig: {
rules: {
"example/make-syntax-error": "error"
}
},
ignore: false,
cwd: getFixturePath(".")
});
const options = { filePath: "test.js" };
const results = await eslint.lintText("var bar = foo", options);
assert.deepStrictEqual(results, [
{
filePath: getFixturePath("test.js"),
messages: [
{
ruleId: null,
fatal: true,
severity: 2,
message: "Parsing error: Unexpected token is",
line: 1,
column: 19,
nodeType: null
}
],
suppressedMessages: [],
errorCount: 1,
warningCount: 0,
fatalErrorCount: 1,
fixableErrorCount: 0,
fixableWarningCount: 0,
output: "var bar = foothis is a syntax error.",
usedDeprecatedRules: []
}
]);
});
it("should not crash even if there are any syntax error since the first time.", async () => {
eslint = eslintWithPlugins({
overrideConfigFile: true,
fix: true,
overrideConfig: {
rules: {
"example/make-syntax-error": "error"
}
},
ignore: false,
cwd: getFixturePath()
});
const options = { filePath: "test.js" };
const results = await eslint.lintText("var bar =", options);
assert.deepStrictEqual(results, [
{
filePath: getFixturePath("test.js"),
messages: [
{
ruleId: null,
fatal: true,
severity: 2,
message: "Parsing error: Unexpected token",
line: 1,
column: 10,
nodeType: null
}
],
suppressedMessages: [],
errorCount: 1,
warningCount: 0,
fatalErrorCount: 1,
fixableErrorCount: 0,
fixableWarningCount: 0,
source: "var bar =",
usedDeprecatedRules: []
}
]);
});
it("should return source code of file in `source` property when errors are present", async () => {
eslint = new FlatESLint({
overrideConfigFile: true,
overrideConfig: {
rules: { semi: 2 }
}
});
const results = await eslint.lintText("var foo = 'bar'");
assert.strictEqual(results[0].source, "var foo = 'bar'");
});
it("should return source code of file in `source` property when warnings are present", async () => {
eslint = new FlatESLint({
overrideConfigFile: true,
overrideConfig: {
rules: { semi: 1 }
}
});
const results = await eslint.lintText("var foo = 'bar'");
assert.strictEqual(results[0].source, "var foo = 'bar'");
});
it("should not return a `source` property when no errors or warnings are present", async () => {
eslint = new FlatESLint({
overrideConfigFile: true,
overrideConfig: {
rules: { semi: 2 }
}
});
const results = await eslint.lintText("var foo = 'bar';");
assert.strictEqual(results[0].messages.length, 0);
assert.strictEqual(results[0].source, void 0);
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should not return a `source` property when fixes are applied", async () => {
eslint = new FlatESLint({
overrideConfigFile: true,
fix: true,
overrideConfig: {
rules: {
semi: 2,
"no-unused-vars": 2
}
}
});
const results = await eslint.lintText("var msg = 'hi' + foo\n");
assert.strictEqual(results[0].source, void 0);
assert.strictEqual(results[0].output, "var msg = 'hi' + foo;\n");
});
it("should return a `source` property when a parsing error has occurred", async () => {
eslint = new FlatESLint({
overrideConfigFile: true,
overrideConfig: {
rules: { eqeqeq: 2 }
}
});
const results = await eslint.lintText("var bar = foothis is a syntax error.\n return bar;");
assert.deepStrictEqual(results, [
{
filePath: "<text>",
messages: [
{
ruleId: null,
fatal: true,
severity: 2,
message: "Parsing error: Unexpected token is",
line: 1,
column: 19,
nodeType: null
}
],
suppressedMessages: [],
errorCount: 1,
warningCount: 0,
fatalErrorCount: 1,
fixableErrorCount: 0,
fixableWarningCount: 0,
source: "var bar = foothis is a syntax error.\n return bar;",
usedDeprecatedRules: []
}
]);
});
// https://github.com/eslint/eslint/issues/5547
it("should respect default ignore rules (ignoring node_modules), even with --no-ignore", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(),
ignore: false
});
const results = await eslint.lintText("var bar = foo;", { filePath: "node_modules/passing.js", warnIgnored: true });
const expectedMsg = "File ignored by default because it is located under the node_modules directory. Use ignore pattern \"!**/node_modules/\" to disable file ignore settings or use \"--no-warn-ignored\" to suppress this warning.";
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].filePath, getFixturePath("node_modules/passing.js"));
assert.strictEqual(results[0].messages[0].message, expectedMsg);
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should warn when deprecated rules are found in a config", async () => {
eslint = new FlatESLint({
cwd: originalDir,
overrideConfigFile: "tests/fixtures/cli-engine/deprecated-rule-config/eslint.config.js"
});
const [result] = await eslint.lintText("foo");
assert.deepStrictEqual(
result.usedDeprecatedRules,
[{ ruleId: "indent-legacy", replacedBy: ["indent"] }]
);
});
it("should throw if eslint.config.js file is not present", async () => {
eslint = new FlatESLint({
cwd: getFixturePath("..")
});
await assert.rejects(() => eslint.lintText("var foo = 'bar';"), /Could not find config file/u);
});
it("should not throw if eslint.config.js file is not present and overrideConfigFile is `true`", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(".."),
overrideConfigFile: true
});
await eslint.lintText("var foo = 'bar';");
});
it("should not throw if eslint.config.js file is not present and overrideConfigFile is path to a config file", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(".."),
overrideConfigFile: "fixtures/configurations/quotes-error.js"
});
await eslint.lintText("var foo = 'bar';");
});
it("should throw if overrideConfigFile is path to a file that doesn't exist", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(""),
overrideConfigFile: "does-not-exist.js"
});
await assert.rejects(() => eslint.lintText("var foo = 'bar';"), { code: "ENOENT" });
});
it("should throw if non-string value is given to 'code' parameter", async () => {
eslint = new FlatESLint();
await assert.rejects(() => eslint.lintText(100), /'code' must be a string/u);
});
it("should throw if non-object value is given to 'options' parameter", async () => {
eslint = new FlatESLint();
await assert.rejects(() => eslint.lintText("var a = 0", "foo.js"), /'options' must be an object, null, or undefined/u);
});
it("should throw if 'options' argument contains unknown key", async () => {
eslint = new FlatESLint();
await assert.rejects(() => eslint.lintText("var a = 0", { filename: "foo.js" }), /'options' must not include the unknown option\(s\): filename/u);
});
it("should throw if non-string value is given to 'options.filePath' option", async () => {
eslint = new FlatESLint();
await assert.rejects(() => eslint.lintText("var a = 0", { filePath: "" }), /'options.filePath' must be a non-empty string or undefined/u);
});
it("should throw if non-boolean value is given to 'options.warnIgnored' option", async () => {
eslint = new FlatESLint();
await assert.rejects(() => eslint.lintText("var a = 0", { warnIgnored: "" }), /'options.warnIgnored' must be a boolean or undefined/u);
});
it("should work with config file that exports a promise", async () => {
eslint = new FlatESLint({
cwd: getFixturePath("promise-config")
});
const results = await eslint.lintText('var foo = "bar";');
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 1);
assert.strictEqual(results[0].messages[0].severity, 2);
assert.strictEqual(results[0].messages[0].ruleId, "quotes");
});
describe("Alternate config files", () => {
it("should find eslint.config.mjs when present", async () => {
const cwd = getFixturePath("mjs-config");
eslint = new FlatESLint({
cwd
});
const results = await eslint.lintText("foo");
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 1);
assert.strictEqual(results[0].messages[0].severity, 2);
assert.strictEqual(results[0].messages[0].ruleId, "no-undef");
});
it("should find eslint.config.cjs when present", async () => {
const cwd = getFixturePath("cjs-config");
eslint = new FlatESLint({
cwd
});
const results = await eslint.lintText("foo");
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 1);
assert.strictEqual(results[0].messages[0].severity, 1);
assert.strictEqual(results[0].messages[0].ruleId, "no-undef");
});
it("should favor eslint.config.js when eslint.config.mjs and eslint.config.cjs are present", async () => {
const cwd = getFixturePath("js-mjs-cjs-config");
eslint = new FlatESLint({
cwd
});
const results = await eslint.lintText("foo");
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 0);
});
it("should favor eslint.config.mjs when eslint.config.cjs is present", async () => {
const cwd = getFixturePath("mjs-cjs-config");
eslint = new FlatESLint({
cwd
});
const results = await eslint.lintText("foo");
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 1);
assert.strictEqual(results[0].messages[0].severity, 2);
assert.strictEqual(results[0].messages[0].ruleId, "no-undef");
});
});
});
describe("lintFiles()", () => {
/** @type {InstanceType<import("../../../lib/eslint").ESLint>} */
let eslint;
it("should use correct parser when custom parser is specified", async () => {
const filePath = path.resolve(__dirname, "../../fixtures/configurations/parser/custom.js");
eslint = new FlatESLint({
cwd: originalDir,
ignore: false,
overrideConfigFile: true,
overrideConfig: {
languageOptions: {
parser: require(filePath)
}
}
});
const results = await eslint.lintFiles([filePath]);
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 1);
assert.strictEqual(results[0].messages[0].message, "Parsing error: Boom!");
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should report zero messages when given a config file and a valid file", async () => {
eslint = new FlatESLint({
cwd: originalDir,
overrideConfigFile: "tests/fixtures/simple-valid-project/eslint.config.js"
});
const results = await eslint.lintFiles(["tests/fixtures/simple-valid-project/**/foo*.js"]);
assert.strictEqual(results.length, 2);
assert.strictEqual(results[0].messages.length, 0);
assert.strictEqual(results[1].messages.length, 0);
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should handle multiple patterns with overlapping files", async () => {
eslint = new FlatESLint({
cwd: originalDir,
overrideConfigFile: "tests/fixtures/simple-valid-project/eslint.config.js"
});
const results = await eslint.lintFiles([
"tests/fixtures/simple-valid-project/**/foo*.js",
"tests/fixtures/simple-valid-project/foo.?s",
"tests/fixtures/simple-valid-project/{foo,src/foobar}.js"
]);
assert.strictEqual(results.length, 2);
assert.strictEqual(results[0].messages.length, 0);
assert.strictEqual(results[1].messages.length, 0);
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should report zero messages when given a config file and a valid file and espree as parser", async () => {
eslint = new FlatESLint({
overrideConfig: {
languageOptions: {
parser: require("espree"),
parserOptions: {
ecmaVersion: 2021
}
}
},
overrideConfigFile: true
});
const results = await eslint.lintFiles(["lib/cli.js"]);
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 0);
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should report zero messages when given a config file and a valid file and esprima as parser", async () => {
eslint = new FlatESLint({
overrideConfig: {
languageOptions: {
parser: require("esprima")
}
},
overrideConfigFile: true,
ignore: false
});
const results = await eslint.lintFiles(["tests/fixtures/passing.js"]);
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 0);
assert.strictEqual(results[0].suppressedMessages.length, 0);
});
it("should throw if eslint.config.js file is not present", async () => {
eslint = new FlatESLint({
cwd: getFixturePath("..")
});
await assert.rejects(() => eslint.lintFiles("fixtures/undef*.js"), /Could not find config file/u);
});
it("should not throw if eslint.config.js file is not present and overrideConfigFile is `true`", async () => {
eslint = new FlatESLint({
cwd: getFixturePath(".."),
overrideConfigFile: true
});
await eslint.lintFiles("fixtures/undef*.js");
});