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watch-cli.ts
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watch-cli.ts
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import type { FSWatcher } from 'node:fs';
import { readFile } from 'node:fs/promises';
import process from 'node:process';
import chokidar from 'chokidar';
import dateTime from 'date-time';
import ms from 'pretty-ms';
import { onExit } from 'signal-exit';
import * as rollup from '../../src/node-entry';
import type { MergedRollupOptions, RollupWatcher } from '../../src/rollup/types';
import { bold, cyan, green, underline } from '../../src/utils/colors';
import relativeId from '../../src/utils/relativeId';
import { handleError, stderr } from '../logging';
import { getConfigPath } from './getConfigPath';
import { loadConfigFile } from './loadConfigFile';
import type { BatchWarnings } from './loadConfigFileType';
import loadConfigFromCommand from './loadConfigFromCommand';
import { getResetScreen } from './resetScreen';
import { printTimings } from './timings';
import { createWatchHooks } from './watchHooks';
export async function watch(command: Record<string, any>): Promise<void> {
process.env.ROLLUP_WATCH = 'true';
const isTTY = process.stderr.isTTY;
const silent = command.silent;
let watcher: RollupWatcher;
let configWatcher: FSWatcher;
let resetScreen: (heading: string) => void;
const configFile = command.config ? await getConfigPath(command.config) : null;
const runWatchHook = createWatchHooks(command);
onExit(close);
process.on('uncaughtException', close);
if (!process.stdin.isTTY) {
process.stdin.on('end', close);
process.stdin.resume();
}
async function loadConfigFromFileAndTrack(configFile: string): Promise<void> {
let configFileData: string | null = null;
let configFileRevision = 0;
configWatcher = chokidar.watch(configFile).on('change', reloadConfigFile);
await reloadConfigFile();
async function reloadConfigFile() {
try {
const newConfigFileData = await readFile(configFile, 'utf8');
if (newConfigFileData === configFileData) {
return;
}
configFileRevision++;
const currentConfigFileRevision = configFileRevision;
if (configFileData) {
stderr(`\nReloading updated config...`);
}
configFileData = newConfigFileData;
const { options, warnings } = await loadConfigFile(configFile, command);
if (currentConfigFileRevision !== configFileRevision) {
return;
}
if (watcher) {
await watcher.close();
}
start(options, warnings);
} catch (error: any) {
handleError(error, true);
}
}
}
if (configFile) {
await loadConfigFromFileAndTrack(configFile);
} else {
const { options, warnings } = await loadConfigFromCommand(command);
await start(options, warnings);
}
async function start(configs: MergedRollupOptions[], warnings: BatchWarnings): Promise<void> {
watcher = rollup.watch(configs as any);
watcher.on('event', event => {
switch (event.code) {
case 'ERROR': {
warnings.flush();
handleError(event.error, true);
runWatchHook('onError');
break;
}
case 'START': {
if (!silent) {
if (!resetScreen) {
resetScreen = getResetScreen(configs, isTTY);
}
resetScreen(underline(`rollup v${rollup.VERSION}`));
}
runWatchHook('onStart');
break;
}
case 'BUNDLE_START': {
if (!silent) {
let input = event.input;
if (typeof input !== 'string') {
input = Array.isArray(input)
? input.join(', ')
: Object.values(input as Record<string, string>).join(', ');
}
stderr(
cyan(`bundles ${bold(input)} → ${bold(event.output.map(relativeId).join(', '))}...`)
);
}
runWatchHook('onBundleStart');
break;
}
case 'BUNDLE_END': {
warnings.flush();
if (!silent)
stderr(
green(
`created ${bold(event.output.map(relativeId).join(', '))} in ${bold(
ms(event.duration)
)}`
)
);
runWatchHook('onBundleEnd');
if (event.result && event.result.getTimings) {
printTimings(event.result.getTimings());
}
break;
}
case 'END': {
runWatchHook('onEnd');
if (!silent && isTTY) {
stderr(`\n[${dateTime()}] waiting for changes...`);
}
}
}
if ('result' in event && event.result) {
event.result.close().catch(error => handleError(error, true));
}
});
}
async function close(code: number | null | undefined): Promise<void> {
process.removeListener('uncaughtException', close);
// removing a non-existent listener is a no-op
process.stdin.removeListener('end', close);
if (watcher) await watcher.close();
if (configWatcher) configWatcher.close();
// eslint-disable-next-line unicorn/no-process-exit
process.exit(code || 0);
}
// return a promise that never resolves to keep the process running
return new Promise(() => {});
}