@farmfe/core/dist/watcher/config-watcher.js

Farm is a extremely fast web build tool written in Rust. Farm can start a project in milliseconds and perform HMR within 10ms, making it much faster than similar tools like webpack and vite.

import { existsSync } from 'fs';
import { createWatcher } from './create-watcher.js';
export class ConfigWatcher {
    constructor(resolvedUserConfig) {
        this.resolvedUserConfig = resolvedUserConfig;
        this._close = false;
        if (!resolvedUserConfig) {
            throw new Error('Invalid resolvedUserConfig provided to Farm JsConfigWatcher');
        }
    }
    watch(callback) {
        async function handle(file) {
            callback(file);
        }
        const watchedFilesSet = new Set([
            ...(this.resolvedUserConfig.envFiles ?? []),
            ...(this.resolvedUserConfig.configFileDependencies ?? []),
            ...(this.resolvedUserConfig.configFilePath
                ? [this.resolvedUserConfig.configFilePath]
                : [])
        ]);
        const watchedFiles = Array.from(watchedFilesSet).filter((file) => file && existsSync(file));
        const chokidarOptions = {
            awaitWriteFinish: process.platform === 'linux'
                ? undefined
                : {
                    stabilityThreshold: 10,
                    pollInterval: 80
                }
        };
        this.watcher = createWatcher(this.resolvedUserConfig, watchedFiles, chokidarOptions);
        this.watcher.on('change', (path) => {
            if (this._close)
                return;
            if (watchedFiles.includes(path)) {
                handle([path]);
            }
        });
        return this;
    }
    close() {
        this._close = true;
        this.watcher = null;
    }
}
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