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eslint.js
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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 fs = require("fs");
const os = require("os");
const path = require("path");
const escapeStringRegExp = require("escape-string-regexp");
const fCache = require("file-entry-cache");
const leche = require("leche");
const sinon = require("sinon");
const proxyquire = require("proxyquire").noCallThru().noPreserveCache();
const shell = require("shelljs");
const { CascadingConfigArrayFactory } = require("../../../lib/cli-engine/cascading-config-array-factory");
const hash = require("../../../lib/cli-engine/hash");
const { unIndent, defineESLintWithInMemoryFileSystem } = require("../../_utils");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
describe("ESLint", () => {
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")["ESLint"]} */
let ESLint;
/**
* 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 ESLint({
...options,
plugins: {
[examplePluginName]: examplePlugin,
[examplePluginNameWithNamespace]: examplePlugin,
[examplePreprocessorName]: require("../../fixtures/processors/custom-processor")
}
});
}
/**
* Call the last argument.
* @param {any[]} args Arguments
* @returns {void}
*/
function callLastArgument(...args) {
process.nextTick(args[args.length - 1], null);
}
// copy into clean area so as not to get "infected" by this project's .eslintrc files
before(() => {
shell.mkdir("-p", fixtureDir);
shell.cp("-r", "./tests/fixtures/.", fixtureDir);
});
beforeEach(() => {
({ ESLint } = require("../../../lib/eslint/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 ESLint();
const results = await engine.lintFiles("eslint.js");
assert.strictEqual(path.dirname(results[0].filePath), __dirname);
} finally {
process.chdir(originalDir);
}
});
it("should report one fatal message when given a path by --ignore-path that is not a file when ignore is true.", () => {
assert.throws(() => {
// eslint-disable-next-line no-new
new ESLint({ ignorePath: fixtureDir });
}, new RegExp(escapeStringRegExp(`Cannot read .eslintignore file: ${fixtureDir}\nError: EISDIR: illegal operation on a directory, read`), "u"));
});
// https://github.com/eslint/eslint/issues/2380
it("should not modify baseConfig when format is specified", () => {
const customBaseConfig = { root: true };
new ESLint({ baseConfig: customBaseConfig }); // eslint-disable-line no-new
assert.deepStrictEqual(customBaseConfig, { root: true });
});
it("should throw readable messages if removed options are present", () => {
assert.throws(
() => new ESLint({
cacheFile: "",
configFile: "",
envs: [],
globals: [],
ignorePattern: [],
parser: "",
parserOptions: {},
rules: {},
plugins: []
}),
new RegExp(escapeStringRegExp([
"Invalid Options:",
"- Unknown options: cacheFile, configFile, envs, globals, ignorePattern, parser, parserOptions, rules",
"- 'cacheFile' has been removed. Please use the 'cacheLocation' option instead.",
"- 'configFile' has been removed. Please use the 'overrideConfigFile' option instead.",
"- 'envs' has been removed. Please use the 'overrideConfig.env' option instead.",
"- 'globals' has been removed. Please use the 'overrideConfig.globals' option instead.",
"- 'ignorePattern' has been removed. Please use the 'overrideConfig.ignorePatterns' option instead.",
"- 'parser' has been removed. Please use the 'overrideConfig.parser' option instead.",
"- 'parserOptions' has been removed. Please use the 'overrideConfig.parserOptions' option instead.",
"- 'rules' has been removed. Please use the 'overrideConfig.rules' option instead.",
"- 'plugins' doesn't add plugins to configuration to load. Please use the 'overrideConfig.plugins' option instead."
].join("\n")), "u")
);
});
it("should throw readable messages if wrong type values are given to options", () => {
assert.throws(
() => new ESLint({
allowInlineConfig: "",
baseConfig: "",
cache: "",
cacheLocation: "",
cwd: "foo",
errorOnUnmatchedPattern: "",
extensions: "",
fix: "",
fixTypes: ["xyz"],
globInputPaths: "",
ignore: "",
ignorePath: "",
overrideConfig: "",
overrideConfigFile: "",
plugins: "",
reportUnusedDisableDirectives: "",
resolvePluginsRelativeTo: "",
rulePaths: "",
useEslintrc: ""
}),
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.",
"- 'extensions' must be an array of non-empty strings or null.",
"- 'fix' must be a boolean or a function.",
"- 'fixTypes' must be an array of any of \"problem\", \"suggestion\", and \"layout\".",
"- 'globInputPaths' must be a boolean.",
"- 'ignore' must be a boolean.",
"- 'ignorePath' must be a non-empty string or null.",
"- 'overrideConfig' must be an object or null.",
"- 'overrideConfigFile' must be a non-empty string or null.",
"- 'plugins' must be an object or null.",
"- 'reportUnusedDisableDirectives' must be any of \"error\", \"warn\", \"off\", and null.",
"- 'resolvePluginsRelativeTo' must be a non-empty string or null.",
"- 'rulePaths' must be an array of non-empty strings.",
"- 'useElintrc' must be a boolean."
].join("\n")), "u")
);
});
it("should throw readable messages if 'plugins' option contains empty key", () => {
assert.throws(
() => new ESLint({
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 .eslintrc", async () => {
eslint = new ESLint();
const results = await eslint.lintText("var foo = 'bar';");
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 5);
assert.strictEqual(results[0].messages[0].ruleId, "strict");
assert.strictEqual(results[0].messages[1].ruleId, "no-var");
assert.strictEqual(results[0].messages[2].ruleId, "no-unused-vars");
assert.strictEqual(results[0].messages[3].ruleId, "quotes");
assert.strictEqual(results[0].messages[4].ruleId, "eol-last");
assert.strictEqual(results[0].fixableErrorCount, 3);
assert.strictEqual(results[0].fixableWarningCount, 0);
assert.strictEqual(results[0].usedDeprecatedRules.length, 0);
});
it("should report the total and per file warnings when using local cwd .eslintrc", async () => {
eslint = new ESLint({
overrideConfig: {
rules: {
quotes: 1,
"no-var": 1,
"eol-last": 1,
strict: 1,
"no-unused-vars": 1
}
}
});
const results = await eslint.lintText("var foo = 'bar';");
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 5);
assert.strictEqual(results[0].messages[0].ruleId, "strict");
assert.strictEqual(results[0].messages[1].ruleId, "no-var");
assert.strictEqual(results[0].messages[2].ruleId, "no-unused-vars");
assert.strictEqual(results[0].messages[3].ruleId, "quotes");
assert.strictEqual(results[0].messages[4].ruleId, "eol-last");
assert.strictEqual(results[0].fixableErrorCount, 0);
assert.strictEqual(results[0].fixableWarningCount, 3);
assert.strictEqual(results[0].usedDeprecatedRules.length, 0);
});
it("should report one message when using specific config file", async () => {
eslint = new ESLint({
overrideConfigFile: "fixtures/configurations/quotes-error.json",
useEslintrc: false,
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].usedDeprecatedRules.length, 0);
});
it("should report the filename when passed in", async () => {
eslint = new ESLint({
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 ESLint({
ignorePath: getFixturePath(".eslintignore"),
cwd: getFixturePath("..")
});
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 override.");
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].fixableErrorCount, 0);
assert.strictEqual(results[0].fixableWarningCount, 0);
assert.strictEqual(results[0].usedDeprecatedRules.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 ESLint({
ignorePath: getFixturePath(".eslintignore"),
cwd: getFixturePath("..")
});
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 suppress excluded file warnings by default", async () => {
eslint = new ESLint({
ignorePath: getFixturePath(".eslintignore"),
cwd: getFixturePath("..")
});
const options = { filePath: "fixtures/passing.js" };
const results = await eslint.lintText("var bar = foo;", options);
// should not report anything because there are no errors
assert.strictEqual(results.length, 0);
});
it("should return a message when given a filename by --stdin-filename in excluded files list and ignore is off", async () => {
eslint = new ESLint({
ignorePath: "fixtures/.eslintignore",
cwd: getFixturePath(".."),
ignore: false,
useEslintrc: false,
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);
});
it("should return a message and fixed text when in fix mode", async () => {
eslint = new ESLint({
useEslintrc: false,
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: [],
errorCount: 0,
warningCount: 0,
fixableErrorCount: 0,
fixableWarningCount: 0,
output: "var bar = foo;",
usedDeprecatedRules: []
}
]);
});
it("correctly autofixes semicolon-conflicting-fixes", async () => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
useEslintrc: false,
fix: true
});
const inputPath = getFixturePath("autofix/semicolon-conflicting-fixes.js");
const outputPath = getFixturePath("autofix/semicolon-conflicting-fixes.expected.js");
const results = await eslint.lintFiles([inputPath]);
const expectedOutput = fs.readFileSync(outputPath, "utf8");
assert.strictEqual(results[0].output, expectedOutput);
});
it("correctly autofixes return-conflicting-fixes", async () => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
useEslintrc: false,
fix: true
});
const inputPath = getFixturePath("autofix/return-conflicting-fixes.js");
const outputPath = getFixturePath("autofix/return-conflicting-fixes.expected.js");
const results = await eslint.lintFiles([inputPath]);
const expectedOutput = fs.readFileSync(outputPath, "utf8");
assert.strictEqual(results[0].output, expectedOutput);
});
describe("Fix Types", () => {
it("should throw an error when an invalid fix type is specified", () => {
assert.throws(() => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
useEslintrc: false,
fix: true,
fixTypes: ["layou"]
});
}, /'fixTypes' must be an array of any of "problem", "suggestion", and "layout"\./iu);
});
it("should not fix any rules when fixTypes is used without fix", async () => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
useEslintrc: false,
fix: false,
fixTypes: ["layout"]
});
const inputPath = getFixturePath("fix-types/fix-only-semi.js");
const results = await eslint.lintFiles([inputPath]);
assert.strictEqual(results[0].output, void 0);
});
it("should not fix non-style rules when fixTypes has only 'layout'", async () => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
useEslintrc: false,
fix: true,
fixTypes: ["layout"]
});
const inputPath = getFixturePath("fix-types/fix-only-semi.js");
const outputPath = getFixturePath("fix-types/fix-only-semi.expected.js");
const results = await eslint.lintFiles([inputPath]);
const expectedOutput = fs.readFileSync(outputPath, "utf8");
assert.strictEqual(results[0].output, expectedOutput);
});
it("should not fix style or problem rules when fixTypes has only 'suggestion'", async () => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
useEslintrc: false,
fix: true,
fixTypes: ["suggestion"]
});
const inputPath = getFixturePath("fix-types/fix-only-prefer-arrow-callback.js");
const outputPath = getFixturePath("fix-types/fix-only-prefer-arrow-callback.expected.js");
const results = await eslint.lintFiles([inputPath]);
const expectedOutput = fs.readFileSync(outputPath, "utf8");
assert.strictEqual(results[0].output, expectedOutput);
});
it("should fix both style and problem rules when fixTypes has 'suggestion' and 'layout'", async () => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
useEslintrc: false,
fix: true,
fixTypes: ["suggestion", "layout"]
});
const inputPath = getFixturePath("fix-types/fix-both-semi-and-prefer-arrow-callback.js");
const outputPath = getFixturePath("fix-types/fix-both-semi-and-prefer-arrow-callback.expected.js");
const results = await eslint.lintFiles([inputPath]);
const expectedOutput = fs.readFileSync(outputPath, "utf8");
assert.strictEqual(results[0].output, expectedOutput);
});
it("should not throw an error when a rule doesn't have a 'meta' property", async () => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
useEslintrc: false,
fix: true,
fixTypes: ["layout"],
rulePaths: [getFixturePath("rules", "fix-types-test")]
});
const inputPath = getFixturePath("fix-types/ignore-missing-meta.js");
const outputPath = getFixturePath("fix-types/ignore-missing-meta.expected.js");
const results = await eslint.lintFiles([inputPath]);
const expectedOutput = fs.readFileSync(outputPath, "utf8");
assert.strictEqual(results[0].output, expectedOutput);
});
it("should not throw an error when a rule is loaded after initialization with lintFiles()", async () => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
useEslintrc: false,
fix: true,
fixTypes: ["layout"],
plugins: {
test: {
rules: {
"no-program": require(getFixturePath("rules", "fix-types-test", "no-program.js"))
}
}
}
});
const inputPath = getFixturePath("fix-types/ignore-missing-meta.js");
const outputPath = getFixturePath("fix-types/ignore-missing-meta.expected.js");
const results = await eslint.lintFiles([inputPath]);
const expectedOutput = fs.readFileSync(outputPath, "utf8");
assert.strictEqual(results[0].output, expectedOutput);
});
it("should not throw an error when a rule is loaded after initialization with lintText()", async () => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
useEslintrc: false,
fix: true,
fixTypes: ["layout"],
plugins: {
test: {
rules: {
"no-program": require(getFixturePath("rules", "fix-types-test", "no-program.js"))
}
}
}
});
const inputPath = getFixturePath("fix-types/ignore-missing-meta.js");
const outputPath = getFixturePath("fix-types/ignore-missing-meta.expected.js");
const results = await eslint.lintText(fs.readFileSync(inputPath, { encoding: "utf8" }), { filePath: inputPath });
const expectedOutput = fs.readFileSync(outputPath, "utf8");
assert.strictEqual(results[0].output, expectedOutput);
});
});
it("should return a message and omit fixed text when in fix mode and fixes aren't done", async () => {
eslint = new ESLint({
useEslintrc: false,
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"
}
],
errorCount: 1,
warningCount: 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({
useEslintrc: false,
fix: true,
overrideConfig: {
plugins: ["example"],
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
}
],
errorCount: 1,
warningCount: 0,
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 = new ESLint({
useEslintrc: false,
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
}
],
errorCount: 1,
warningCount: 0,
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 ESLint({
useEslintrc: false,
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 ESLint({
useEslintrc: false,
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 ESLint({
useEslintrc: false,
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);
});
it("should not return a `source` property when fixes are applied", async () => {
eslint = new ESLint({
useEslintrc: false,
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 ESLint({
useEslintrc: false,
overrideConfig: {
rules: { semi: 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
}
],
errorCount: 1,
warningCount: 0,
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, even with --no-ignore", async () => {
eslint = new ESLint({
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. Use \"--ignore-pattern '!node_modules/*'\" to override.";
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].filePath, getFixturePath("node_modules/passing.js"));
assert.strictEqual(results[0].messages[0].message, expectedMsg);
});
describe('plugin shorthand notation ("@scope" for "@scope/eslint-plugin")', () => {
const Module = require("module");
let originalFindPath = null;
/* eslint-disable no-underscore-dangle */
before(() => {
originalFindPath = Module._findPath;
Module._findPath = function(id, ...otherArgs) {
if (id === "@scope/eslint-plugin") {
return path.resolve(__dirname, "../../fixtures/plugin-shorthand/basic/node_modules/@scope/eslint-plugin/index.js");
}
return originalFindPath.call(this, id, ...otherArgs);
};
});
after(() => {
Module._findPath = originalFindPath;
});
/* eslint-enable no-underscore-dangle */
it("should resolve 'plugins:[\"@scope\"]' to 'node_modules/@scope/eslint-plugin'.", async () => {
eslint = new ESLint({ cwd: getFixturePath("plugin-shorthand/basic") });
const [result] = await eslint.lintText("var x = 0", { filePath: "index.js" });
assert.strictEqual(result.filePath, getFixturePath("plugin-shorthand/basic/index.js"));
assert.strictEqual(result.messages[0].ruleId, "@scope/rule");
assert.strictEqual(result.messages[0].message, "OK");
});
it("should resolve 'extends:[\"plugin:@scope/recommended\"]' to 'node_modules/@scope/eslint-plugin'.", async () => {
eslint = new ESLint({ cwd: getFixturePath("plugin-shorthand/extends") });
const [result] = await eslint.lintText("var x = 0", { filePath: "index.js" });
assert.strictEqual(result.filePath, getFixturePath("plugin-shorthand/extends/index.js"));
assert.strictEqual(result.messages[0].ruleId, "@scope/rule");
assert.strictEqual(result.messages[0].message, "OK");
});
});
it("should warn when deprecated rules are found in a config", async () => {
eslint = new ESLint({
cwd: originalDir,
useEslintrc: false,
overrideConfigFile: "tests/fixtures/cli-engine/deprecated-rule-config/.eslintrc.yml"
});
const [result] = await eslint.lintText("foo");
assert.deepStrictEqual(
result.usedDeprecatedRules,
[{ ruleId: "indent-legacy", replacedBy: ["indent"] }]
);
});
it("should throw if non-string value is given to 'code' parameter", async () => {
eslint = new ESLint();
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 ESLint();
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 ESLint();
await assert.rejects(() => eslint.lintText("var a = 0", { filename: "foo.js" }), /'options' must not include the unknown option 'filename'/u);
});
it("should throw if non-string value is given to 'options.filePath' option", async () => {
eslint = new ESLint();
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 ESLint();
await assert.rejects(() => eslint.lintText("var a = 0", { warnIgnored: "" }), /'options.warnIgnored' must be a boolean or undefined/u);
});
});
describe("lintFiles()", () => {
/** @type {InstanceType<import("../../../lib/eslint")["ESLint"]>} */
let eslint;
it("should use correct parser when custom parser is specified", async () => {
eslint = new ESLint({
cwd: originalDir,
ignore: false
});
const filePath = path.resolve(__dirname, "../../fixtures/configurations/parser/custom.js");
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!");
});
it("should report zero messages when given a config file and a valid file", async () => {
eslint = new ESLint({
cwd: originalDir,
overrideConfigFile: ".eslintrc.js"
});
const results = await eslint.lintFiles(["lib/**/cli*.js"]);
assert.strictEqual(results.length, 2);
assert.strictEqual(results[0].messages.length, 0);
assert.strictEqual(results[1].messages.length, 0);
});
it("should handle multiple patterns with overlapping files", async () => {
eslint = new ESLint({
cwd: originalDir,
overrideConfigFile: ".eslintrc.js"
});
const results = await eslint.lintFiles(["lib/**/cli*.js", "lib/cli.?s", "lib/{cli,cli-engine/cli-engine}.js"]);
assert.strictEqual(results.length, 2);
assert.strictEqual(results[0].messages.length, 0);
assert.strictEqual(results[1].messages.length, 0);
});
it("should report zero messages when given a config file and a valid file and espree as parser", async () => {
eslint = new ESLint({
overrideConfig: {
parser: "espree",
parserOptions: {
ecmaVersion: 2020
}
},
useEslintrc: false
});
const results = await eslint.lintFiles(["lib/cli.js"]);
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 0);
});
it("should report zero messages when given a config file and a valid file and esprima as parser", async () => {
eslint = new ESLint({
overrideConfig: {
parser: "esprima"
},
useEslintrc: false,
ignore: false
});
const results = await eslint.lintFiles(["tests/fixtures/passing.js"]);
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 0);
});
it("should throw an error when given a config file and a valid file and invalid parser", async () => {
eslint = new ESLint({
overrideConfig: {
parser: "test11"
},
useEslintrc: false
});
await assert.rejects(async () => await eslint.lintFiles(["lib/cli.js"]), /Cannot find module 'test11'/u);
});
it("should report zero messages when given a directory with a .js2 file", async () => {
eslint = new ESLint({
cwd: path.join(fixtureDir, ".."),
extensions: [".js2"]
});
const results = await eslint.lintFiles([getFixturePath("files/foo.js2")]);
assert.strictEqual(results.length, 1);
assert.strictEqual(results[0].messages.length, 0);
});
it("should fall back to defaults when extensions is set to an empty array", async () => {
eslint = new ESLint({
cwd: getFixturePath("configurations"),
overrideConfigFile: getFixturePath("configurations", "quotes-error.json"),
extensions: []
});
const results = await eslint.lintFiles([getFixturePath("single-quoted.js")]);
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].severity, 2);
assert.strictEqual(results[0].errorCount, 1);
assert.strictEqual(results[0].warningCount, 0);
assert.strictEqual(results[0].fixableErrorCount, 1);
assert.strictEqual(results[0].fixableWarningCount, 0);
});
it("should report zero messages when given a directory with a .js and a .js2 file", async () => {
eslint = new ESLint({
extensions: [".js", ".js2"],
ignore: false,
cwd: getFixturePath("..")
});
const results = await eslint.lintFiles(["fixtures/files/"]);
assert.strictEqual(results.length, 2);
assert.strictEqual(results[0].messages.length, 0);
assert.strictEqual(results[1].messages.length, 0);
});
it("should report zero messages when given a '**' pattern with a .js and a .js2 file", async () => {
eslint = new ESLint({
extensions: [".js", ".js2"],
ignore: false,
cwd: path.join(fixtureDir, "..")
});
const results = await eslint.lintFiles(["fixtures/files/*"]);
assert.strictEqual(results.length, 2);
assert.strictEqual(results[0].messages.length, 0);
assert.strictEqual(results[1].messages.length, 0);
});
it("should resolve globs when 'globInputPaths' option is true", async () => {
eslint = new ESLint({
extensions: [".js", ".js2"],
ignore: false,
cwd: getFixturePath("..")
});
const results = await eslint.lintFiles(["fixtures/files/*"]);