Lazy-load dependencies in CLI entrypoint

Author: novemberborn

lib/cli.js

@@ -1,10 +1,8 @@
-
 import fs from 'node:fs';
 import path from 'node:path';
 import process from 'node:process';
 
 import arrify from 'arrify';
-import ciParallelVars from 'ci-parallel-vars';
 import figures from 'figures';
 import yargs from 'yargs';
 import {hideBin} from 'yargs/helpers'; // eslint-disable-line n/file-extension-in-import
@@ -14,16 +12,12 @@ 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 pkg from './pkg.cjs';
-import providerManager from './provider-manager.js';
-import DefaultReporter from './reporters/default.js';
-import TapReporter from './reporters/tap.js';
 
 function exit(message) {
 	console.error(`\n  ${chalk.red(figures.cross)} ${message}`);
@@ -348,6 +342,7 @@ export default async function loadCli() { // eslint-disable-line complexity
 
 	const providers = [];
 	if (Object.hasOwn(conf, 'typescript')) {
+		const {default: providerManager} = await import('./provider-manager.js');
 		try {
 			const {identifier: protocol, level, main} = await providerManager.typescript(projectDir, {fullConfig: conf});
 			providers.push({
@@ -397,9 +392,12 @@ export default async function loadCli() { // eslint-disable-line complexity
 	}
 
 	let parallelRuns = null;
-	if (isCi && ciParallelVars && combined.utilizeParallelBuilds !== false) {
-		const {index: currentIndex, total: totalRuns} = ciParallelVars;
-		parallelRuns = {currentIndex, totalRuns};
+	if (isCi && combined.utilizeParallelBuilds !== false) {
+		const {default: ciParallelVars} = await import('ci-parallel-vars');
+		if (ciParallelVars) {
+			const {index: currentIndex, total: totalRuns} = ciParallelVars;
+			parallelRuns = {currentIndex, totalRuns};
+		}
 	}
 
 	const match = combined.match === '' ? [] : arrify(combined.match);
@@ -441,29 +439,39 @@ export default async function loadCli() { // eslint-disable-line complexity
 		workerArgv: argv['--'],
 	});
 
-	const reporter = combined.tap && !argv.watch && debug === null ? new TapReporter({
-		extensions: globs.extensions,
-		projectDir,
-		reportStream: process.stdout,
-		stdStream: process.stderr,
-	}) : new DefaultReporter({
-		extensions: globs.extensions,
-		projectDir,
-		reportStream: process.stdout,
-		stdStream: process.stderr,
-		watching: argv.watch,
-	});
-
-	api.on('run', plan => {
-		reporter.startRun(plan);
+	let reporter;
+	if (combined.tap && !argv.watch && debug === null) {
+		const {default: TapReporter} = await import('./reporters/tap.js');
+		reporter = new TapReporter({
+			extensions: globs.extensions,
+			projectDir,
+			reportStream: process.stdout,
+			stdStream: process.stderr,
+		});
+	} else {
+		const {default: Reporter} = await import('./reporters/default.js');
+		reporter = new Reporter({
+			extensions: globs.extensions,
+			projectDir,
+			reportStream: process.stdout,
+			stdStream: process.stderr,
+			watching: argv.watch,
+		});
+	}
 
-		if (process.env.TEST_AVA) {
-			const bufferedSend = controlFlow(process);
+	if (process.env.TEST_AVA) {
+		const {controlFlow} = await import('./ipc-flow-control.cjs');
+		const bufferedSend = controlFlow(process);
 
+		api.on('run', plan => {
 			plan.status.on('stateChange', evt => {
 				bufferedSend(evt);
 			});
-		}
+		});
+	}
+
+	api.on('run', plan => {
+		reporter.startRun(plan);
 
 		plan.status.on('stateChange', evt => {
 			if (evt.type === 'interrupt') {