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flat-compat.js
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flat-compat.js
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/**
* @fileoverview Tests for FlatCompat class.
* @author Nicholas C. Zakas
*/
//-----------------------------------------------------------------------------
// Requirements
//-----------------------------------------------------------------------------
import path from "path";
import { fileURLToPath, pathToFileURL } from "url";
import { assert } from "chai";
import { FlatCompat } from "../../lib/index.js";
import environments from "../../conf/environments.js";
const dirname = path.dirname(fileURLToPath(import.meta.url));
//-----------------------------------------------------------------------------
// Helpers
//-----------------------------------------------------------------------------
const FIXTURES_BASE_PATH = path.resolve(dirname, "../fixtures/flat-compat/");
/**
* Normalizes a plugin object to have all available keys. This matches what
* ConfigArrayFactory does.
* @param {Object} plugin The plugin object to normalize.
* @returns {Object} The normalized plugin object.
*/
function normalizePlugin(plugin) {
return {
configs: {},
rules: {},
environments: {},
processors: {},
...plugin
};
}
/**
* Returns the full directory path for a fixture directory.
* @param {string} dirName The directory name to resolve.
* @returns {string} The full directory path to the fixture.
*/
function getFixturePath(dirName) {
return path.join(FIXTURES_BASE_PATH, dirName);
}
//-----------------------------------------------------------------------------
// Tests
//-----------------------------------------------------------------------------
describe("FlatCompat", () => {
describe("config()", async () => {
let compat;
const baseDirectory = getFixturePath("config");
const pluginFixture1 = normalizePlugin((await import(pathToFileURL(path.join(baseDirectory, "node_modules/eslint-plugin-fixture1.js")))).default);
const pluginFixture2 = normalizePlugin((await import(pathToFileURL(path.join(baseDirectory, "node_modules/eslint-plugin-fixture2.js")))).default);
const pluginFixture3 = normalizePlugin((await import(pathToFileURL(path.join(baseDirectory, "node_modules/eslint-plugin-fixture3.js")))).default);
beforeEach(() => {
compat = new FlatCompat({
baseDirectory,
recommendedConfig: { settings: { "eslint:recommended": true } },
allConfig: { settings: { "eslint:all": true } }
});
});
describe("top-level", () => {
describe("ignorePatterns", () => {
it("should translate ignorePatterns string into ignores array", () => {
const result = compat.config({
ignorePatterns: "*.jsx"
});
assert.strictEqual(result.length, 1);
assert.typeOf(result[0].ignores[0], "function");
assert.isTrue(result[0].ignores[0](path.join(baseDirectory, "foo.jsx")));
assert.isFalse(result[0].ignores[0](path.join(baseDirectory, "foo.js")));
});
it("should translate ignorePatterns array into ignores array", () => {
const result = compat.config({
ignorePatterns: ["*.jsx"]
});
assert.strictEqual(result.length, 1);
assert.typeOf(result[0].ignores[0], "function");
assert.isTrue(result[0].ignores[0](path.join(baseDirectory, "foo.jsx")));
assert.isFalse(result[0].ignores[0](path.join(baseDirectory, "foo.js")));
});
it("should ignore second argument of ignore function from ignorePatterns", () => {
const result = compat.config({
ignorePatterns: ["*.jsx"]
});
assert.strictEqual(result.length, 1);
assert.typeOf(result[0].ignores[0], "function");
assert.isTrue(result[0].ignores[0](path.join(baseDirectory, "foo.jsx"), {}));
assert.isFalse(result[0].ignores[0](path.join(baseDirectory, "foo.js"), ""));
});
it("should combine ignorePatterns from extended configs", () => {
const result = compat.config({
ignorePatterns: ["!foo/bar"],
extends: "ignores-foo"
});
assert.strictEqual(result.length, 1);
assert.typeOf(result[0].ignores[0], "function");
assert.isTrue(result[0].ignores[0](path.join(baseDirectory, "foo/baz.js")));
assert.isFalse(result[0].ignores[0](path.join(baseDirectory, "foo/bar/baz.js")));
});
});
it("should translate settings", () => {
const result = compat.config({
settings: {
foo: true,
bar: false
}
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
settings: {
foo: true,
bar: false
}
});
});
it("should translate plugins without processors", () => {
const result = compat.config({
plugins: ["fixture1"]
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
plugins: {
fixture1: pluginFixture1
}
});
});
it("should translate plugins with processors", () => {
const result = compat.config({
plugins: ["fixture2"]
});
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
files: ["**/*.md"],
processor: pluginFixture2.processors[".md"]
});
assert.deepStrictEqual(result[1], {
plugins: {
fixture2: pluginFixture2
}
});
});
it("should translate multiple plugins", () => {
const result = compat.config({
plugins: ["fixture1", "fixture2"]
});
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
files: ["**/*.md"],
processor: pluginFixture2.processors[".md"]
});
assert.deepStrictEqual(result[1], {
plugins: {
fixture1: pluginFixture1,
fixture2: pluginFixture2
}
});
});
it("should translate plugins with environments", () => {
const result = compat.config({
plugins: ["fixture3"],
env: {
"fixture3/a": true,
"fixture3/b": true
}
});
assert.strictEqual(result.length, 3);
assert.deepStrictEqual(result[0], {
languageOptions: {
globals: {
foo: true
}
}
});
assert.deepStrictEqual(result[1], {
languageOptions: {
globals: {
bar: false
}
}
});
assert.deepStrictEqual(result[2], {
plugins: {
fixture3: pluginFixture3
}
});
});
});
describe("extends", () => {
it("should translate extends string into a config object", () => {
const result = compat.config({
extends: "fixture1",
rules: {
foo: "warn"
}
});
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
languageOptions: {
globals: {
foobar: true
}
}
});
assert.deepStrictEqual(result[1], {
rules: {
foo: "warn"
}
});
});
it("should translate extends eslint:all into settings", () => {
const result = compat.config({
extends: "eslint:all",
rules: {
foo: "warn"
}
});
assert.strictEqual(result.length, 2);
assert.isTrue(result[0].settings["eslint:all"]);
assert.deepStrictEqual(result[1], {
rules: {
foo: "warn"
}
});
});
it("should translate extends [eslint:all] into settings", () => {
const result = compat.config({
extends: ["eslint:all"],
rules: {
foo: "warn"
}
});
assert.strictEqual(result.length, 2);
assert.isTrue(result[0].settings["eslint:all"]);
assert.deepStrictEqual(result[1], {
rules: {
foo: "warn"
}
});
});
it("should translate extends eslint:recommended into settings", () => {
const result = compat.config({
extends: "eslint:recommended",
rules: {
foo: "warn"
}
});
assert.strictEqual(result.length, 2);
assert.isTrue(result[0].settings["eslint:recommended"]);
assert.deepStrictEqual(result[1], {
rules: {
foo: "warn"
}
});
});
it("should translate extends [eslint:recommended] into settings", () => {
const result = compat.config({
extends: ["eslint:recommended"],
rules: {
foo: "warn"
}
});
assert.strictEqual(result.length, 2);
assert.isTrue(result[0].settings["eslint:recommended"]);
assert.deepStrictEqual(result[1], {
rules: {
foo: "warn"
}
});
});
it("should translate extends array into a config object", () => {
const result = compat.config({
extends: ["fixture1"],
rules: {
foo: "warn"
}
});
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
languageOptions: {
globals: {
foobar: true
}
}
});
assert.deepStrictEqual(result[1], {
rules: {
foo: "warn"
}
});
});
it("should translate extends array with multiple configs into config objects", () => {
const result = compat.config({
extends: ["fixture1", "eslint:all", "fixture2"],
rules: {
foo: "warn"
}
});
assert.strictEqual(result.length, 4);
assert.deepStrictEqual(result[0], {
languageOptions: {
globals: {
foobar: true
}
}
});
assert.isTrue(result[1].settings["eslint:all"]);
assert.deepStrictEqual(result[2], {
languageOptions: {
globals: {
foobar: false
}
},
rules: {
foobar: "error"
}
});
assert.deepStrictEqual(result[3], {
rules: {
foo: "warn"
}
});
});
it("should throw an error when extending eslint:all without allConfig", () => {
const invalidCompat = new FlatCompat();
assert.throws(() => {
invalidCompat.config({
extends: "eslint:all"
});
}, /Missing parameter 'allConfig'/gu);
});
it("should throw an error when extending eslint:recommended without recommendedConfig", () => {
const invalidCompat = new FlatCompat();
assert.throws(() => {
invalidCompat.config({
extends: "eslint:recommended"
});
}, /Missing parameter 'recommendedConfig'/gu);
});
});
describe("overrides", () => {
it("should translate files string into files array", () => {
const result = compat.config({
rules: {
foo: "error"
},
overrides: [
{
files: "*.jsx",
rules: {
foo: "warn"
}
}
]
});
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
rules: {
foo: "error"
}
});
assert.typeOf(result[1].files[0], "function");
assert.isTrue(result[1].files[0]("/usr/eslint/foo.jsx"));
assert.isFalse(result[1].files[0]("/usr/eslint/foo.js"));
assert.deepStrictEqual(result[1].rules, {
foo: "warn"
});
});
it("should translate files array into files array", () => {
const result = compat.config({
rules: {
foo: "error"
},
overrides: [
{
files: ["*.jsx"],
rules: {
foo: "warn"
}
}
]
});
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
rules: {
foo: "error"
}
});
assert.typeOf(result[1].files[0], "function");
assert.isTrue(result[1].files[0]("/usr/eslint/foo.jsx"));
assert.isFalse(result[1].files[0]("/usr/eslint/foo.js"));
assert.deepStrictEqual(result[1].rules, {
foo: "warn"
});
});
it("should translate files array with multiple patterns into files array", () => {
const result = compat.config({
rules: {
foo: "error"
},
overrides: [
{
files: ["*.jsx", "*.js"],
rules: {
foo: "warn"
}
}
]
});
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
rules: {
foo: "error"
}
});
assert.typeOf(result[1].files[0], "function");
assert.isTrue(result[1].files[0]("/usr/eslint/foo.jsx"));
assert.isTrue(result[1].files[0]("/usr/eslint/foo.js"));
assert.isFalse(result[1].files[0]("/usr/eslint/foo.jsm"));
assert.deepStrictEqual(result[1].rules, {
foo: "warn"
});
});
it("should translate files/excludedFiles strings into files/ignores array", () => {
const result = compat.config({
rules: {
foo: "error"
},
overrides: [
{
files: "*",
excludedFiles: "*.jsx",
rules: {
foo: "warn"
}
}
]
});
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
rules: {
foo: "error"
}
});
assert.typeOf(result[1].files[0], "function");
assert.isFalse(result[1].files[0]("/usr/eslint/foo.jsx"));
assert.isTrue(result[1].files[0]("/usr/eslint/foo.js"));
assert.deepStrictEqual(result[1].rules, {
foo: "warn"
});
});
it("should translate files/excludedFiles arrays into files/ignores array", () => {
const result = compat.config({
rules: {
foo: "error"
},
overrides: [
{
files: ["*"],
excludedFiles: ["*.jsx"],
rules: {
foo: "warn"
}
}
]
});
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
rules: {
foo: "error"
}
});
assert.typeOf(result[1].files[0], "function");
assert.isFalse(result[1].files[0]("/usr/eslint/foo.jsx"));
assert.isTrue(result[1].files[0]("/usr/eslint/foo.js"));
assert.deepStrictEqual(result[1].rules, {
foo: "warn"
});
});
it("should translate files/excludedFiles arrays with multiple items into files/ignores array", () => {
const result = compat.config({
rules: {
foo: "error"
},
overrides: [
{
files: ["*.js", "*.jsx"],
excludedFiles: ["*.test.js", "*test.jsx"],
rules: {
foo: "warn"
}
}
]
});
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
rules: {
foo: "error"
}
});
assert.typeOf(result[1].files[0], "function");
assert.isTrue(result[1].files[0]("/usr/eslint/foo.jsx"));
assert.isTrue(result[1].files[0]("/usr/eslint/foo.js"));
assert.isFalse(result[1].files[0]("/usr/eslint/foo.test.jsx"));
assert.isFalse(result[1].files[0]("/usr/eslint/foo.test.js"));
assert.deepStrictEqual(result[1].rules, {
foo: "warn"
});
});
it("should translate multiple files/excludedFiles arrays with multiple items into files/ignores array", () => {
const result = compat.config({
rules: {
foo: "error"
},
overrides: [
{
files: ["*.js", "*.jsx"],
excludedFiles: ["*.test.js", "*test.jsx"],
rules: {
foo: "warn"
}
},
{
files: ["*.md", "*.mdx"],
excludedFiles: ["*.test.md", "*test.mdx"],
rules: {
bar: "error"
}
}
]
});
assert.strictEqual(result.length, 3);
assert.deepStrictEqual(result[0], {
rules: {
foo: "error"
}
});
assert.typeOf(result[1].files[0], "function");
assert.isTrue(result[1].files[0]("/usr/eslint/foo.jsx"));
assert.isTrue(result[1].files[0]("/usr/eslint/foo.js"));
assert.isFalse(result[1].files[0]("/usr/eslint/foo.test.jsx"));
assert.isFalse(result[1].files[0]("/usr/eslint/foo.test.js"));
assert.deepStrictEqual(result[1].rules, {
foo: "warn"
});
assert.typeOf(result[2].files[0], "function");
assert.isTrue(result[2].files[0]("/usr/eslint/foo.mdx"));
assert.isTrue(result[2].files[0]("/usr/eslint/foo.md"));
assert.isFalse(result[2].files[0]("/usr/eslint/foo.test.mdx"));
assert.isFalse(result[2].files[0]("/usr/eslint/foo.test.md"));
assert.deepStrictEqual(result[2].rules, {
bar: "error"
});
});
});
describe("linterOptions", () => {
["noInlineConfig", "reportUnusedDisableDirectives"].forEach(propertyName => {
it(`should translate ${propertyName} into linterOptions.${propertyName}`, () => {
const result = compat.config({
[propertyName]: true
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
linterOptions: {
[propertyName]: true
}
});
});
});
it("should translate multiple linteroptions", () => {
const result = compat.config({
noInlineConfig: true,
reportUnusedDisableDirectives: false
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
linterOptions: {
noInlineConfig: true,
reportUnusedDisableDirectives: false
}
});
});
});
describe("languageOptions", () => {
it("should translate globals", () => {
const result = compat.config({
globals: {
foo: true,
bar: false
}
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
globals: {
foo: true,
bar: false
}
}
});
});
it("should translate env into globals", () => {
const result = compat.config({
env: {
amd: true
}
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
...environments.get("amd")
}
});
});
it("should translate parserOptions", () => {
const parserOptions = {
foo: true,
bar: false
};
const result = compat.config({
parserOptions
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
parserOptions: {
foo: true,
bar: false
}
}
});
// the object should be a clone, not the original
assert.notStrictEqual(result[0].languageOptions.parserOptions, parserOptions);
});
it("should translate parser string into an object", async () => {
const result = compat.config({
parser: "my-parser"
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
parser: (await import(pathToFileURL(getFixturePath("config/node_modules/my-parser.js")))).default
}
});
});
it("should throw an error when the parser can't be found", () => {
assert.throws(() => {
compat.config({
parser: "missing-parser"
});
}, /Failed to load parser 'missing-parser'/u);
});
it("should translate sourceType", () => {
const result = compat.config({
parserOptions: {
sourceType: "module"
}
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
sourceType: "module"
}
});
});
it("should translate multiple options", () => {
const result = compat.config({
parserOptions: {
sourceType: "module"
},
globals: {
foo: true,
bar: false
}
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
sourceType: "module",
globals: {
foo: true,
bar: false
}
}
});
});
});
});
describe("env()", () => {
let compat;
beforeEach(() => {
compat = new FlatCompat();
});
it("should translate env into globals", () => {
const result = compat.env({
amd: true
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
...environments.get("amd")
}
});
});
it("should not translate env into globals when env is false", () => {
const result = compat.env({
amd: true,
node: false
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
...environments.get("amd")
}
});
});
it("should translate env with parserOptions.ecmaVersion into globals and languageOptions.ecmaVersion", () => {
const result = compat.env({
es6: true
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
ecmaVersion: 6,
globals: {
...environments.get("es6").globals
}
}
});
});
it("should translate env with parserOptions.ecmaFeatures.globalReturn into globals and languageOptions.parserOptions", () => {
const result = compat.env({
node: true
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
parserOptions: environments.get("node").parserOptions,
globals: {
...environments.get("node").globals
}
}
});
});
it("should translate env with parserOptions.ecmaFeatures.globalReturn into globals and languageOptions.parserOptions", () => {
const result = compat.env({
es2021: true
});
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
ecmaVersion: 12,
globals: {
...environments.get("es2021").globals
}
}
});
});
});
describe("extends()", () => {
let compat;
beforeEach(() => {
compat = new FlatCompat({
baseDirectory: getFixturePath("config"),
recommendedConfig: { settings: { "eslint:recommended": true } },
allConfig: { settings: { "eslint:all": true } }
});
});
it("should translate extends string into a config object", () => {
const result = compat.extends("fixture1");
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
languageOptions: {
globals: {
foobar: true
}
}
});
});
it("should translate extends eslint:all into settings", () => {
const result = compat.extends("eslint:all");
assert.strictEqual(result.length, 1);
assert.isTrue(result[0].settings["eslint:all"]);
});
it("should translate extends eslint:recommended into settings", () => {
const result = compat.extends("eslint:recommended");
assert.strictEqual(result.length, 1);
assert.isTrue(result[0].settings["eslint:recommended"]);
});
it("should translate extends array with multiple configs into config objects", () => {
const result = compat.extends("fixture1", "eslint:all", "fixture2");
assert.strictEqual(result.length, 3);
assert.deepStrictEqual(result[0], {
languageOptions: {
globals: {
foobar: true
}
}
});
assert.isTrue(result[1].settings["eslint:all"]);
assert.deepStrictEqual(result[2], {
languageOptions: {
globals: {
foobar: false
}
},
rules: {
foobar: "error"
}
});
});
it("should throw an error when extending eslint:all without allConfig", () => {
const invalidCompat = new FlatCompat();
assert.throws(() => {
invalidCompat.extends("eslint:all");
}, /Missing parameter 'allConfig'/gu);
});
it("should throw an error when extending eslint:recommended without recommendedConfig", () => {
const invalidCompat = new FlatCompat();
assert.throws(() => {
invalidCompat.extends("eslint:recommended");
}, /Missing parameter 'recommendedConfig'/gu);
});
it("should throw an error when extending eslint:recommended without recommendedConfig but with allConfig", () => {
const invalidCompat = new FlatCompat({
allConfig: {}
});
assert.throws(() => {
invalidCompat.extends("eslint:recommended");
}, /Missing parameter 'recommendedConfig'/gu);
});
});
describe("plugins()", () => {
let compat;
beforeEach(() => {
compat = new FlatCompat({
baseDirectory: getFixturePath("config")
});
});
it("should translate plugins without processors", async () => {
const result = compat.plugins("fixture1");
assert.strictEqual(result.length, 1);
assert.deepStrictEqual(result[0], {
plugins: {
fixture1: {
configs: {},
rules: {},
environments: {},
processors: {},
...(await import(pathToFileURL(path.join(compat.baseDirectory, "node_modules/eslint-plugin-fixture1.js")))).default
}
}
});
});
it("should throw an error when a plugin is missing", () => {
assert.throws(() => {
compat.plugins("missing");
}, /Failed to load plugin 'missing'/u);
});
it("should translate plugins with processors", async () => {
const result = compat.plugins("fixture2");
const plugin = (await import(pathToFileURL(path.join(compat.baseDirectory, "node_modules/eslint-plugin-fixture2.js")))).default;
assert.strictEqual(result.length, 2);
assert.deepStrictEqual(result[0], {
files: ["**/*.md"],