Convert to ESM

.xo-config.json

@@ -0,0 +1,74 @@
+{
+	"ignores": [
+		"media/**",
+		"test/config/fixtures/config-errors/test.js",
+		"test/config/fixtures/mjs-with-tests/**",
+		"test-tap/fixture/ava-paths/target/test.js",
+		"test-tap/fixture/{source-map-initial,syntax-error}.js",
+		"test-tap/fixture/snapshots/test-sourcemaps/build/**",
+		"test-tap/fixture/power-assert.js",
+		"test-tap/fixture/report/edgecases/ast-syntax-error.js"
+	],
+	"rules": {
+		"import/no-anonymous-default-export": "off",
+		"import/no-mutable-exports": "off",
+		"import/order": [
+			"error",
+			{
+				"alphabetize": {
+					"order": "asc"
+				},
+				"newlines-between": "always"
+			}
+		],
+		"import/newline-after-import": "error",
+		"node/no-unsupported-features/es-syntax": "off",
+		"no-use-extend-native/no-use-extend-native": "off"
+	},
+	"overrides": [
+		{
+			"files": "index.d.ts",
+			"rules": {
+				"@typescript-eslint/member-ordering": "off",
+				"@typescript-eslint/method-signature-style": "off",
+				"@typescript-eslint/prefer-readonly-parameter-types": "off",
+				"@typescript-eslint/prefer-function-type": "off",
+				"@typescript-eslint/unified-signatures": "off"
+			}
+		},
+		{
+			"files": "test-{d,tap}/**/*.ts",
+			"rules": {
+				"@typescript-eslint/explicit-function-return-type": "off",
+				"@typescript-eslint/no-empty-function": "off",
+				"@typescript-eslint/no-unsafe-call": "off",
+				"@typescript-eslint/no-unsafe-member-access": "off",
+				"@typescript-eslint/no-unsafe-return": "off",
+				"@typescript-eslint/no-unused-vars": "off",
+				"@typescript-eslint/prefer-readonly-parameter-types": "off",
+				"import/extensions": "off",
+				"no-unused-vars": "off"
+			}
+		},
+		{
+			"files": "test-tap/**/*.js",
+			"rules": {
+				"promise/prefer-await-to-then": "off",
+				"unicorn/error-message": "off",
+				"unicorn/no-array-reduce": "off",
+				"unicorn/prevent-abbreviations": "off"
+			}
+		},
+		{
+			"files": [
+				"test-tap/fixture/**",
+				"test/**/fixtures/**"
+			],
+			"rules": {
+				"ava/no-todo-test": "off",
+				"import/no-extraneous-dependencies": "off",
+				"import/no-unresolved": "off"
+			}
+		}
+	]
+}

entrypoints/cli.mjs

@@ -1,3 +1,4 @@
 #!/usr/bin/env node
-import * as cli from '../lib/cli.js'; // eslint-disable-line import/extensions
-cli.run();
+import run from '../lib/cli.js';
+
+run();

entrypoints/main.mjs

@@ -1,2 +1,3 @@
 import test from '../lib/worker/main.cjs';
+
 export default test;

lib/api.js

@@ -1,24 +1,25 @@
-'use strict';
-const fs = require('fs');
-const path = require('path');
-const os = require('os');
-const commonPathPrefix = require('common-path-prefix');
-const resolveCwd = require('resolve-cwd');
-const debounce = require('lodash/debounce');
-const arrify = require('arrify');
-const ms = require('ms');
-const chunkd = require('chunkd');
-const Emittery = require('emittery');
-const pMap = require('p-map');
-const tempDir = require('temp-dir');
-const globs = require('./globs');
-const isCi = require('./is-ci');
-const RunStatus = require('./run-status');
-const fork = require('./fork');
-const serializeError = require('./serialize-error');
-const {getApplicableLineNumbers} = require('./line-numbers');
-const sharedWorkers = require('./plugin-support/shared-workers');
-const scheduler = require('./scheduler');
+import fs from 'fs';
+import os from 'os';
+import path from 'path';
+
+import arrify from 'arrify';
+import chunkd from 'chunkd';
+import commonPathPrefix from 'common-path-prefix';
+import Emittery from 'emittery';
+import debounce from 'lodash/debounce.js';
+import ms from 'ms';
+import pMap from 'p-map';
+import resolveCwd from 'resolve-cwd';
+import tempDir from 'temp-dir';
+
+import fork from './fork.js';
+import * as globs from './globs.js';
+import isCi from './is-ci.js';
+import {getApplicableLineNumbers} from './line-numbers.js';
+import * as sharedWorkers from './plugin-support/shared-workers.js';
+import RunStatus from './run-status.js';
+import * as scheduler from './scheduler.js';
+import serializeError from './serialize-error.js';
 
 function resolveModules(modules) {
 	return arrify(modules).map(name => {
@@ -41,7 +42,7 @@ function getFilePathPrefix(files) {
 	return commonPathPrefix(files);
 }
 
-class Api extends Emittery {
+export default class Api extends Emittery {
 	constructor(options) {
 		super();
 
@@ -282,5 +283,3 @@ class Api extends Emittery {
 		return cacheDir;
 	}
 }
-
-module.exports = Api;

lib/assert.js

@@ -1,10 +1,10 @@
-'use strict';
-const concordance = require('concordance');
-const isError = require('is-error');
-const isPromise = require('is-promise');
-const concordanceOptions = require('./concordance-options').default;
-const {CIRCULAR_SELECTOR, isLikeSelector, selectComparable} = require('./like-selector');
-const snapshotManager = require('./snapshot-manager');
+import concordance from 'concordance';
+import isError from 'is-error';
+import isPromise from 'is-promise';
+
+import concordanceOptions from './concordance-options.js';
+import {CIRCULAR_SELECTOR, isLikeSelector, selectComparable} from './like-selector.js';
+import * as snapshotManager from './snapshot-manager.js';
 
 function formatDescriptorDiff(actualDescriptor, expectedDescriptor, options) {
 	options = {...options, ...concordanceOptions};
@@ -35,7 +35,7 @@ const notImplemented = () => {
 	throw new Error('not implemented');
 };
 
-class AssertionError extends Error {
+export class AssertionError extends Error {
 	constructor(options) {
 		super(options.message || '');
 		this.name = 'AssertionError';
@@ -58,9 +58,8 @@ class AssertionError extends Error {
 		this.savedError = options.savedError ? options.savedError : getErrorWithLongStackTrace();
 	}
 }
-exports.AssertionError = AssertionError;
 
-function checkAssertionMessage(assertion, message) {
+export function checkAssertionMessage(assertion, message) {
 	if (typeof message === 'undefined' || typeof message === 'string') {
 		return true;
 	}
@@ -73,8 +72,6 @@ function checkAssertionMessage(assertion, message) {
 	});
 }
 
-exports.checkAssertionMessage = checkAssertionMessage;
-
 function getErrorWithLongStackTrace() {
 	const limitBefore = Error.stackTraceLimit;
 	Error.stackTraceLimit = Number.POSITIVE_INFINITY;
@@ -254,7 +251,7 @@ function assertExpectations({assertion, actual, expectations, message, prefix, s
 	}
 }
 
-class Assertions {
+export class Assertions {
 	constructor({
 		pass = notImplemented,
 		pending = notImplemented,
@@ -990,4 +987,3 @@ class Assertions {
 		}
 	}
 }
-exports.Assertions = Assertions;

lib/chalk.js

@@ -1,20 +1,14 @@
-'use strict';
-const chalk = require('chalk');
+import chalk from 'chalk';
 
-let ctx = null;
-exports.get = () => {
-	if (!ctx) {
-		throw new Error('Chalk has not yet been configured');
-	}
-
-	return ctx;
-};
+let instance = new chalk.Instance();
+export default instance;
 
-exports.set = options => {
-	if (ctx) {
+let configured = false;
+export function set(options) {
+	if (configured) {
 		throw new Error('Chalk has already been configured');
 	}
 
-	ctx = new chalk.Instance(options);
-	return ctx;
-};
+	configured = true;
+	instance = new chalk.Instance(options);
+}

lib/cli.js

@@ -1,16 +1,34 @@
-'use strict';
-const path = require('path');
-const del = require('del');
-const updateNotifier = require('update-notifier');
-const figures = require('figures');
-const arrify = require('arrify');
-const yargs = require('yargs');
-const readPkg = require('read-pkg');
-const isCi = require('./is-ci');
-const {loadConfig} = require('./load-config');
+import {createRequire} from 'module';
+import path from 'path';
+
+import arrify from 'arrify';
+import ciParallelVars from 'ci-parallel-vars';
+import del from 'del';
+import figures from 'figures';
+import readPkg from 'read-pkg';
+import updateNotifier from 'update-notifier';
+
+import Api from './api.js';
+import chalk from './chalk.js';
+import validateEnvironmentVariables from './environment-variables.js';
+import normalizeExtensions from './extensions.js';
+import {normalizeGlobs, normalizePattern} from './globs.js';
+import {controlFlow} from './ipc-flow-control.cjs';
+import isCi from './is-ci.js';
+import {splitPatternAndLineNumbers} from './line-numbers.js';
+import {loadConfig} from './load-config.js';
+import normalizeModuleTypes from './module-types.js';
+import normalizeNodeArguments from './node-arguments.js';
+import avaPackage from './pkg.cjs';
+import * as providerManager from './provider-manager.js';
+import DefaultReporter from './reporters/default.js';
+import TapReporter from './reporters/tap.js';
+import Watcher from './watcher.js';
+
+const yargs = createRequire(import.meta.url)('yargs'); // FIXME: Use ESM
 
 function exit(message) {
-	console.error(`\n  ${require('./chalk').get().red(figures.cross)} ${message}`);
+	console.error(`\n  ${chalk.red(figures.cross)} ${message}`);
 	process.exit(1); // eslint-disable-line unicorn/no-process-exit
 }
 
@@ -83,7 +101,7 @@ const FLAGS = {
 	}
 };
 
-exports.run = async () => { // eslint-disable-line complexity
+export default async () => { // eslint-disable-line complexity
 	let conf = {};
 	let confError = null;
 	try {
@@ -96,7 +114,13 @@ exports.run = async () => { // eslint-disable-line complexity
 	// Enter debug mode if the main process is being inspected. This assumes the
 	// worker processes are automatically inspected, too. It is not necessary to
 	// run AVA with the debug command, though it's allowed.
-	const activeInspector = require('inspector').url() !== undefined; // eslint-disable-line node/no-unsupported-features/node-builtins
+	let activeInspector = false;
+	try {
+		const {default: inspector} = await import('inspector');
+
+		activeInspector = inspector.url() !== undefined;
+	} catch {}
+
 	let debug = activeInspector ?
 		{
 			active: true,
@@ -207,8 +231,9 @@ exports.run = async () => { // eslint-disable-line complexity
 		}
 	}
 
-	const chalkOptions = {level: combined.color === false ? 0 : require('chalk').level};
-	const chalk = require('./chalk').set(chalkOptions);
+	const chalkOptions = {level: combined.color === false ? 0 : (await import('chalk')).level};
+	const {set: setChalk} = await import('./chalk.js');
+	setChalk(chalkOptions);
 
 	if (confError) {
 		if (confError.parent) {
@@ -218,7 +243,7 @@ exports.run = async () => { // eslint-disable-line complexity
 		}
 	}
 
-	updateNotifier({pkg: require('../package.json')}).notify();
+	updateNotifier({pkg: avaPackage}).notify();
 
 	const {nonSemVerExperiments: experiments, projectDir} = conf;
 	if (resetCache) {
@@ -285,19 +310,6 @@ exports.run = async () => { // eslint-disable-line complexity
 		exit('’sources’ has been removed. Use ’ignoredByWatcher’ to provide glob patterns of files that the watcher should ignore.');
 	}
 
-	const ciParallelVars = require('ci-parallel-vars');
-	const Api = require('./api');
-	const DefaultReporter = require('./reporters/default');
-	const TapReporter = require('./reporters/tap');
-	const Watcher = require('./watcher');
-	const normalizeExtensions = require('./extensions');
-	const normalizeModuleTypes = require('./module-types');
-	const {normalizeGlobs, normalizePattern} = require('./globs');
-	const normalizeNodeArguments = require('./node-arguments');
-	const validateEnvironmentVariables = require('./environment-variables');
-	const {splitPatternAndLineNumbers} = require('./line-numbers');
-	const providerManager = require('./provider-manager');
-
 	let pkg;
 	try {
 		pkg = readPkg.sync({cwd: projectDir});
@@ -312,7 +324,7 @@ exports.run = async () => { // eslint-disable-line complexity
 	const providers = [];
 	if (Reflect.has(conf, 'babel')) {
 		try {
-			const {level, main} = providerManager.babel(projectDir);
+			const {level, main} = await providerManager.babel(projectDir);
 			providers.push({
 				level,
 				main: main({config: conf.babel}),
@@ -325,7 +337,7 @@ exports.run = async () => { // eslint-disable-line complexity
 
 	if (Reflect.has(conf, 'typescript')) {
 		try {
-			const {level, main} = providerManager.typescript(projectDir);
+			const {level, main} = await providerManager.typescript(projectDir);
 			providers.push({
 				level,
 				main: main({config: conf.typescript}),
@@ -430,7 +442,6 @@ exports.run = async () => { // eslint-disable-line complexity
 		reporter.startRun(plan);
 
 		if (process.env.AVA_EMIT_RUN_STATUS_OVER_IPC === 'I\'ll find a payphone baby / Take some time to talk to you') {
-			const {controlFlow} = require('./ipc-flow-control');
 			const bufferedSend = controlFlow(process);
 
 			plan.status.on('stateChange', evt => {

lib/code-excerpt.js

@@ -1,14 +1,15 @@
-'use strict';
-const fs = require('fs');
-const equalLength = require('equal-length');
-const codeExcerpt = require('code-excerpt');
-const truncate = require('cli-truncate');
-const chalk = require('./chalk').get();
+import fs from 'fs';
+
+import truncate from 'cli-truncate';
+import codeExcerpt from 'code-excerpt';
+import equalLength from 'equal-length';
+
+import chalk from './chalk.js';
 
 const formatLineNumber = (lineNumber, maxLineNumber) =>
 	' '.repeat(Math.max(0, String(maxLineNumber).length - String(lineNumber).length)) + lineNumber;
 
-module.exports = (source, options = {}) => {
+export default (source, options = {}) => {
 	if (!source.isWithinProject || source.isDependency) {
 		return null;
 	}