/*! chokidar - MIT License (c) 2012 Paul Miller (paulmillr.com) */
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import { stat as statcb } from 'fs';
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import { stat, readdir } from 'fs/promises';
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import { EventEmitter } from 'events';
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import * as sysPath from 'path';
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import { readdirp } from 'readdirp';
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import { NodeFsHandler, EVENTS as EV, isWindows, isIBMi, EMPTY_FN, STR_CLOSE, STR_END, } from './handler.js';
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const SLASH = '/';
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const SLASH_SLASH = '//';
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const ONE_DOT = '.';
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const TWO_DOTS = '..';
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const STRING_TYPE = 'string';
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const BACK_SLASH_RE = /\\/g;
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const DOUBLE_SLASH_RE = /\/\//;
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const DOT_RE = /\..*\.(sw[px])$|~$|\.subl.*\.tmp/;
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const REPLACER_RE = /^\.[/\\]/;
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function arrify(item) {
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return Array.isArray(item) ? item : [item];
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}
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const isMatcherObject = (matcher) => typeof matcher === 'object' && matcher !== null && !(matcher instanceof RegExp);
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function createPattern(matcher) {
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if (typeof matcher === 'function')
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return matcher;
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if (typeof matcher === 'string')
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return (string) => matcher === string;
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if (matcher instanceof RegExp)
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return (string) => matcher.test(string);
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if (typeof matcher === 'object' && matcher !== null) {
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return (string) => {
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if (matcher.path === string)
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return true;
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if (matcher.recursive) {
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const relative = sysPath.relative(matcher.path, string);
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if (!relative) {
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return false;
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}
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return !relative.startsWith('..') && !sysPath.isAbsolute(relative);
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}
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return false;
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};
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}
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return () => false;
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}
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function normalizePath(path) {
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if (typeof path !== 'string')
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throw new Error('string expected');
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path = sysPath.normalize(path);
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path = path.replace(/\\/g, '/');
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let prepend = false;
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if (path.startsWith('//'))
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prepend = true;
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const DOUBLE_SLASH_RE = /\/\//;
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while (path.match(DOUBLE_SLASH_RE))
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path = path.replace(DOUBLE_SLASH_RE, '/');
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if (prepend)
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path = '/' + path;
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return path;
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}
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function matchPatterns(patterns, testString, stats) {
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const path = normalizePath(testString);
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for (let index = 0; index < patterns.length; index++) {
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const pattern = patterns[index];
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if (pattern(path, stats)) {
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return true;
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}
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}
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return false;
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}
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function anymatch(matchers, testString) {
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if (matchers == null) {
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throw new TypeError('anymatch: specify first argument');
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}
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// Early cache for matchers.
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const matchersArray = arrify(matchers);
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const patterns = matchersArray.map((matcher) => createPattern(matcher));
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if (testString == null) {
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return (testString, stats) => {
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return matchPatterns(patterns, testString, stats);
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};
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}
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return matchPatterns(patterns, testString);
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}
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const unifyPaths = (paths_) => {
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const paths = arrify(paths_).flat();
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if (!paths.every((p) => typeof p === STRING_TYPE)) {
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throw new TypeError(`Non-string provided as watch path: ${paths}`);
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}
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return paths.map(normalizePathToUnix);
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};
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// If SLASH_SLASH occurs at the beginning of path, it is not replaced
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// because "//StoragePC/DrivePool/Movies" is a valid network path
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const toUnix = (string) => {
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let str = string.replace(BACK_SLASH_RE, SLASH);
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let prepend = false;
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if (str.startsWith(SLASH_SLASH)) {
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prepend = true;
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}
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while (str.match(DOUBLE_SLASH_RE)) {
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str = str.replace(DOUBLE_SLASH_RE, SLASH);
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}
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if (prepend) {
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str = SLASH + str;
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}
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return str;
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};
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// Our version of upath.normalize
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// TODO: this is not equal to path-normalize module - investigate why
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const normalizePathToUnix = (path) => toUnix(sysPath.normalize(toUnix(path)));
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// TODO: refactor
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const normalizeIgnored = (cwd = '') => (path) => {
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if (typeof path === 'string') {
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return normalizePathToUnix(sysPath.isAbsolute(path) ? path : sysPath.join(cwd, path));
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}
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else {
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return path;
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}
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};
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const getAbsolutePath = (path, cwd) => {
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if (sysPath.isAbsolute(path)) {
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return path;
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}
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return sysPath.join(cwd, path);
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};
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const EMPTY_SET = Object.freeze(new Set());
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/**
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* Directory entry.
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*/
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class DirEntry {
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constructor(dir, removeWatcher) {
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this.path = dir;
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this._removeWatcher = removeWatcher;
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this.items = new Set();
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}
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add(item) {
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const { items } = this;
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if (!items)
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return;
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if (item !== ONE_DOT && item !== TWO_DOTS)
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items.add(item);
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}
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async remove(item) {
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const { items } = this;
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if (!items)
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return;
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items.delete(item);
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if (items.size > 0)
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return;
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const dir = this.path;
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try {
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await readdir(dir);
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}
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catch (err) {
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if (this._removeWatcher) {
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this._removeWatcher(sysPath.dirname(dir), sysPath.basename(dir));
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}
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}
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}
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has(item) {
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const { items } = this;
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if (!items)
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return;
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return items.has(item);
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}
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getChildren() {
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const { items } = this;
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if (!items)
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return [];
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return [...items.values()];
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}
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dispose() {
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this.items.clear();
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this.path = '';
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this._removeWatcher = EMPTY_FN;
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this.items = EMPTY_SET;
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Object.freeze(this);
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}
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}
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const STAT_METHOD_F = 'stat';
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const STAT_METHOD_L = 'lstat';
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export class WatchHelper {
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constructor(path, follow, fsw) {
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this.fsw = fsw;
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const watchPath = path;
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this.path = path = path.replace(REPLACER_RE, '');
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this.watchPath = watchPath;
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this.fullWatchPath = sysPath.resolve(watchPath);
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this.dirParts = [];
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this.dirParts.forEach((parts) => {
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if (parts.length > 1)
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parts.pop();
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});
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this.followSymlinks = follow;
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this.statMethod = follow ? STAT_METHOD_F : STAT_METHOD_L;
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}
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entryPath(entry) {
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return sysPath.join(this.watchPath, sysPath.relative(this.watchPath, entry.fullPath));
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}
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filterPath(entry) {
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const { stats } = entry;
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if (stats && stats.isSymbolicLink())
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return this.filterDir(entry);
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const resolvedPath = this.entryPath(entry);
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// TODO: what if stats is undefined? remove !
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return this.fsw._isntIgnored(resolvedPath, stats) && this.fsw._hasReadPermissions(stats);
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}
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filterDir(entry) {
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return this.fsw._isntIgnored(this.entryPath(entry), entry.stats);
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}
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}
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/**
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* Watches files & directories for changes. Emitted events:
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* `add`, `addDir`, `change`, `unlink`, `unlinkDir`, `all`, `error`
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*
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* new FSWatcher()
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* .add(directories)
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* .on('add', path => log('File', path, 'was added'))
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*/
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export class FSWatcher extends EventEmitter {
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// Not indenting methods for history sake; for now.
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constructor(_opts = {}) {
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super();
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this.closed = false;
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this._closers = new Map();
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this._ignoredPaths = new Set();
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this._throttled = new Map();
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this._streams = new Set();
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this._symlinkPaths = new Map();
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this._watched = new Map();
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this._pendingWrites = new Map();
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this._pendingUnlinks = new Map();
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this._readyCount = 0;
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this._readyEmitted = false;
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const awf = _opts.awaitWriteFinish;
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const DEF_AWF = { stabilityThreshold: 2000, pollInterval: 100 };
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const opts = {
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// Defaults
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persistent: true,
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ignoreInitial: false,
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ignorePermissionErrors: false,
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interval: 100,
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binaryInterval: 300,
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followSymlinks: true,
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usePolling: false,
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// useAsync: false,
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atomic: true, // NOTE: overwritten later (depends on usePolling)
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..._opts,
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// Change format
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ignored: _opts.ignored ? arrify(_opts.ignored) : arrify([]),
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awaitWriteFinish: awf === true ? DEF_AWF : typeof awf === 'object' ? { ...DEF_AWF, ...awf } : false,
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};
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// Always default to polling on IBM i because fs.watch() is not available on IBM i.
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if (isIBMi)
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opts.usePolling = true;
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// Editor atomic write normalization enabled by default with fs.watch
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if (opts.atomic === undefined)
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opts.atomic = !opts.usePolling;
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// opts.atomic = typeof _opts.atomic === 'number' ? _opts.atomic : 100;
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// Global override. Useful for developers, who need to force polling for all
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// instances of chokidar, regardless of usage / dependency depth
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const envPoll = process.env.CHOKIDAR_USEPOLLING;
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if (envPoll !== undefined) {
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const envLower = envPoll.toLowerCase();
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if (envLower === 'false' || envLower === '0')
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opts.usePolling = false;
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else if (envLower === 'true' || envLower === '1')
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opts.usePolling = true;
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else
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opts.usePolling = !!envLower;
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}
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const envInterval = process.env.CHOKIDAR_INTERVAL;
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if (envInterval)
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opts.interval = Number.parseInt(envInterval, 10);
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// This is done to emit ready only once, but each 'add' will increase that?
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let readyCalls = 0;
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this._emitReady = () => {
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readyCalls++;
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if (readyCalls >= this._readyCount) {
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this._emitReady = EMPTY_FN;
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this._readyEmitted = true;
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// use process.nextTick to allow time for listener to be bound
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process.nextTick(() => this.emit(EV.READY));
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}
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};
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this._emitRaw = (...args) => this.emit(EV.RAW, ...args);
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this._boundRemove = this._remove.bind(this);
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this.options = opts;
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this._nodeFsHandler = new NodeFsHandler(this);
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// You’re frozen when your heart’s not open.
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Object.freeze(opts);
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}
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_addIgnoredPath(matcher) {
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if (isMatcherObject(matcher)) {
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// return early if we already have a deeply equal matcher object
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for (const ignored of this._ignoredPaths) {
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if (isMatcherObject(ignored) &&
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ignored.path === matcher.path &&
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ignored.recursive === matcher.recursive) {
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return;
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}
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}
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}
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this._ignoredPaths.add(matcher);
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}
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_removeIgnoredPath(matcher) {
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this._ignoredPaths.delete(matcher);
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// now find any matcher objects with the matcher as path
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if (typeof matcher === 'string') {
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for (const ignored of this._ignoredPaths) {
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// TODO (43081j): make this more efficient.
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// probably just make a `this._ignoredDirectories` or some
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// such thing.
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if (isMatcherObject(ignored) && ignored.path === matcher) {
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this._ignoredPaths.delete(ignored);
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}
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}
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}
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}
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// Public methods
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/**
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* Adds paths to be watched on an existing FSWatcher instance.
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* @param paths_ file or file list. Other arguments are unused
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*/
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add(paths_, _origAdd, _internal) {
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const { cwd } = this.options;
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this.closed = false;
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this._closePromise = undefined;
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let paths = unifyPaths(paths_);
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if (cwd) {
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paths = paths.map((path) => {
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const absPath = getAbsolutePath(path, cwd);
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// Check `path` instead of `absPath` because the cwd portion can't be a glob
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return absPath;
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});
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}
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paths.forEach((path) => {
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this._removeIgnoredPath(path);
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});
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this._userIgnored = undefined;
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if (!this._readyCount)
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this._readyCount = 0;
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this._readyCount += paths.length;
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Promise.all(paths.map(async (path) => {
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const res = await this._nodeFsHandler._addToNodeFs(path, !_internal, undefined, 0, _origAdd);
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if (res)
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this._emitReady();
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return res;
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})).then((results) => {
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if (this.closed)
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return;
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results.forEach((item) => {
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if (item)
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this.add(sysPath.dirname(item), sysPath.basename(_origAdd || item));
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});
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});
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return this;
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}
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/**
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* Close watchers or start ignoring events from specified paths.
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*/
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unwatch(paths_) {
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if (this.closed)
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return this;
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const paths = unifyPaths(paths_);
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const { cwd } = this.options;
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paths.forEach((path) => {
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// convert to absolute path unless relative path already matches
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if (!sysPath.isAbsolute(path) && !this._closers.has(path)) {
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if (cwd)
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path = sysPath.join(cwd, path);
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path = sysPath.resolve(path);
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}
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this._closePath(path);
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this._addIgnoredPath(path);
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if (this._watched.has(path)) {
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this._addIgnoredPath({
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path,
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recursive: true,
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});
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}
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// reset the cached userIgnored anymatch fn
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// to make ignoredPaths changes effective
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this._userIgnored = undefined;
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});
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return this;
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}
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/**
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* Close watchers and remove all listeners from watched paths.
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*/
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close() {
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if (this._closePromise) {
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return this._closePromise;
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}
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this.closed = true;
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// Memory management.
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this.removeAllListeners();
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const closers = [];
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this._closers.forEach((closerList) => closerList.forEach((closer) => {
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const promise = closer();
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if (promise instanceof Promise)
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closers.push(promise);
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}));
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this._streams.forEach((stream) => stream.destroy());
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this._userIgnored = undefined;
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this._readyCount = 0;
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this._readyEmitted = false;
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this._watched.forEach((dirent) => dirent.dispose());
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this._closers.clear();
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this._watched.clear();
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this._streams.clear();
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this._symlinkPaths.clear();
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this._throttled.clear();
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this._closePromise = closers.length
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? Promise.all(closers).then(() => undefined)
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: Promise.resolve();
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return this._closePromise;
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}
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/**
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* Expose list of watched paths
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* @returns for chaining
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*/
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getWatched() {
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const watchList = {};
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this._watched.forEach((entry, dir) => {
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const key = this.options.cwd ? sysPath.relative(this.options.cwd, dir) : dir;
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const index = key || ONE_DOT;
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watchList[index] = entry.getChildren().sort();
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});
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return watchList;
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}
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emitWithAll(event, args) {
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this.emit(event, ...args);
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if (event !== EV.ERROR)
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this.emit(EV.ALL, event, ...args);
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}
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// Common helpers
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// --------------
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/**
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* Normalize and emit events.
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* Calling _emit DOES NOT MEAN emit() would be called!
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* @param event Type of event
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* @param path File or directory path
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* @param stats arguments to be passed with event
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* @returns the error if defined, otherwise the value of the FSWatcher instance's `closed` flag
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*/
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async _emit(event, path, stats) {
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if (this.closed)
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return;
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const opts = this.options;
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if (isWindows)
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path = sysPath.normalize(path);
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if (opts.cwd)
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path = sysPath.relative(opts.cwd, path);
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const args = [path];
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if (stats != null)
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args.push(stats);
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const awf = opts.awaitWriteFinish;
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let pw;
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if (awf && (pw = this._pendingWrites.get(path))) {
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pw.lastChange = new Date();
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return this;
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}
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if (opts.atomic) {
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if (event === EV.UNLINK) {
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this._pendingUnlinks.set(path, [event, ...args]);
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setTimeout(() => {
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this._pendingUnlinks.forEach((entry, path) => {
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this.emit(...entry);
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this.emit(EV.ALL, ...entry);
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this._pendingUnlinks.delete(path);
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});
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}, typeof opts.atomic === 'number' ? opts.atomic : 100);
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return this;
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}
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if (event === EV.ADD && this._pendingUnlinks.has(path)) {
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event = EV.CHANGE;
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this._pendingUnlinks.delete(path);
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}
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}
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if (awf && (event === EV.ADD || event === EV.CHANGE) && this._readyEmitted) {
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const awfEmit = (err, stats) => {
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if (err) {
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event = EV.ERROR;
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args[0] = err;
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this.emitWithAll(event, args);
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}
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else if (stats) {
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// if stats doesn't exist the file must have been deleted
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if (args.length > 1) {
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args[1] = stats;
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}
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else {
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args.push(stats);
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}
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this.emitWithAll(event, args);
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}
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};
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this._awaitWriteFinish(path, awf.stabilityThreshold, event, awfEmit);
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return this;
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}
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if (event === EV.CHANGE) {
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const isThrottled = !this._throttle(EV.CHANGE, path, 50);
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if (isThrottled)
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return this;
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}
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if (opts.alwaysStat &&
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stats === undefined &&
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(event === EV.ADD || event === EV.ADD_DIR || event === EV.CHANGE)) {
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const fullPath = opts.cwd ? sysPath.join(opts.cwd, path) : path;
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let stats;
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try {
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stats = await stat(fullPath);
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}
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catch (err) {
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// do nothing
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}
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// Suppress event when fs_stat fails, to avoid sending undefined 'stat'
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if (!stats || this.closed)
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return;
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args.push(stats);
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}
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this.emitWithAll(event, args);
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return this;
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}
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/**
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* Common handler for errors
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* @returns The error if defined, otherwise the value of the FSWatcher instance's `closed` flag
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*/
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_handleError(error) {
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const code = error && error.code;
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if (error &&
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code !== 'ENOENT' &&
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code !== 'ENOTDIR' &&
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(!this.options.ignorePermissionErrors || (code !== 'EPERM' && code !== 'EACCES'))) {
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this.emit(EV.ERROR, error);
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}
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return error || this.closed;
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}
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/**
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* Helper utility for throttling
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* @param actionType type being throttled
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* @param path being acted upon
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* @param timeout duration of time to suppress duplicate actions
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* @returns tracking object or false if action should be suppressed
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*/
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_throttle(actionType, path, timeout) {
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if (!this._throttled.has(actionType)) {
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this._throttled.set(actionType, new Map());
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}
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const action = this._throttled.get(actionType);
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if (!action)
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throw new Error('invalid throttle');
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const actionPath = action.get(path);
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if (actionPath) {
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actionPath.count++;
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return false;
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}
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// eslint-disable-next-line prefer-const
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let timeoutObject;
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const clear = () => {
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const item = action.get(path);
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const count = item ? item.count : 0;
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action.delete(path);
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clearTimeout(timeoutObject);
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if (item)
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clearTimeout(item.timeoutObject);
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return count;
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};
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timeoutObject = setTimeout(clear, timeout);
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const thr = { timeoutObject, clear, count: 0 };
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action.set(path, thr);
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return thr;
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}
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_incrReadyCount() {
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return this._readyCount++;
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}
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/**
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* Awaits write operation to finish.
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* Polls a newly created file for size variations. When files size does not change for 'threshold' milliseconds calls callback.
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* @param path being acted upon
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* @param threshold Time in milliseconds a file size must be fixed before acknowledging write OP is finished
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* @param event
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* @param awfEmit Callback to be called when ready for event to be emitted.
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*/
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_awaitWriteFinish(path, threshold, event, awfEmit) {
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const awf = this.options.awaitWriteFinish;
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if (typeof awf !== 'object')
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return;
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const pollInterval = awf.pollInterval;
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let timeoutHandler;
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let fullPath = path;
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if (this.options.cwd && !sysPath.isAbsolute(path)) {
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fullPath = sysPath.join(this.options.cwd, path);
|
}
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const now = new Date();
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const writes = this._pendingWrites;
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function awaitWriteFinishFn(prevStat) {
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statcb(fullPath, (err, curStat) => {
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if (err || !writes.has(path)) {
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if (err && err.code !== 'ENOENT')
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awfEmit(err);
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return;
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}
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const now = Number(new Date());
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if (prevStat && curStat.size !== prevStat.size) {
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writes.get(path).lastChange = now;
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}
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const pw = writes.get(path);
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const df = now - pw.lastChange;
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if (df >= threshold) {
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writes.delete(path);
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awfEmit(undefined, curStat);
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}
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else {
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timeoutHandler = setTimeout(awaitWriteFinishFn, pollInterval, curStat);
|
}
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});
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}
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if (!writes.has(path)) {
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writes.set(path, {
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lastChange: now,
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cancelWait: () => {
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writes.delete(path);
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clearTimeout(timeoutHandler);
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return event;
|
},
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});
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timeoutHandler = setTimeout(awaitWriteFinishFn, pollInterval);
|
}
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}
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/**
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* Determines whether user has asked to ignore this path.
|
*/
|
_isIgnored(path, stats) {
|
if (this.options.atomic && DOT_RE.test(path))
|
return true;
|
if (!this._userIgnored) {
|
const { cwd } = this.options;
|
const ign = this.options.ignored;
|
const ignored = (ign || []).map(normalizeIgnored(cwd));
|
const ignoredPaths = [...this._ignoredPaths];
|
const list = [...ignoredPaths.map(normalizeIgnored(cwd)), ...ignored];
|
this._userIgnored = anymatch(list, undefined);
|
}
|
return this._userIgnored(path, stats);
|
}
|
_isntIgnored(path, stat) {
|
return !this._isIgnored(path, stat);
|
}
|
/**
|
* Provides a set of common helpers and properties relating to symlink handling.
|
* @param path file or directory pattern being watched
|
*/
|
_getWatchHelpers(path) {
|
return new WatchHelper(path, this.options.followSymlinks, this);
|
}
|
// Directory helpers
|
// -----------------
|
/**
|
* Provides directory tracking objects
|
* @param directory path of the directory
|
*/
|
_getWatchedDir(directory) {
|
const dir = sysPath.resolve(directory);
|
if (!this._watched.has(dir))
|
this._watched.set(dir, new DirEntry(dir, this._boundRemove));
|
return this._watched.get(dir);
|
}
|
// File helpers
|
// ------------
|
/**
|
* Check for read permissions: https://stackoverflow.com/a/11781404/1358405
|
*/
|
_hasReadPermissions(stats) {
|
if (this.options.ignorePermissionErrors)
|
return true;
|
return Boolean(Number(stats.mode) & 0o400);
|
}
|
/**
|
* Handles emitting unlink events for
|
* files and directories, and via recursion, for
|
* files and directories within directories that are unlinked
|
* @param directory within which the following item is located
|
* @param item base path of item/directory
|
*/
|
_remove(directory, item, isDirectory) {
|
// if what is being deleted is a directory, get that directory's paths
|
// for recursive deleting and cleaning of watched object
|
// if it is not a directory, nestedDirectoryChildren will be empty array
|
const path = sysPath.join(directory, item);
|
const fullPath = sysPath.resolve(path);
|
isDirectory =
|
isDirectory != null ? isDirectory : this._watched.has(path) || this._watched.has(fullPath);
|
// prevent duplicate handling in case of arriving here nearly simultaneously
|
// via multiple paths (such as _handleFile and _handleDir)
|
if (!this._throttle('remove', path, 100))
|
return;
|
// if the only watched file is removed, watch for its return
|
if (!isDirectory && this._watched.size === 1) {
|
this.add(directory, item, true);
|
}
|
// This will create a new entry in the watched object in either case
|
// so we got to do the directory check beforehand
|
const wp = this._getWatchedDir(path);
|
const nestedDirectoryChildren = wp.getChildren();
|
// Recursively remove children directories / files.
|
nestedDirectoryChildren.forEach((nested) => this._remove(path, nested));
|
// Check if item was on the watched list and remove it
|
const parent = this._getWatchedDir(directory);
|
const wasTracked = parent.has(item);
|
parent.remove(item);
|
// Fixes issue #1042 -> Relative paths were detected and added as symlinks
|
// (https://github.com/paulmillr/chokidar/blob/e1753ddbc9571bdc33b4a4af172d52cb6e611c10/lib/nodefs-handler.js#L612),
|
// but never removed from the map in case the path was deleted.
|
// This leads to an incorrect state if the path was recreated:
|
// https://github.com/paulmillr/chokidar/blob/e1753ddbc9571bdc33b4a4af172d52cb6e611c10/lib/nodefs-handler.js#L553
|
if (this._symlinkPaths.has(fullPath)) {
|
this._symlinkPaths.delete(fullPath);
|
}
|
// If we wait for this file to be fully written, cancel the wait.
|
let relPath = path;
|
if (this.options.cwd)
|
relPath = sysPath.relative(this.options.cwd, path);
|
if (this.options.awaitWriteFinish && this._pendingWrites.has(relPath)) {
|
const event = this._pendingWrites.get(relPath).cancelWait();
|
if (event === EV.ADD)
|
return;
|
}
|
// The Entry will either be a directory that just got removed
|
// or a bogus entry to a file, in either case we have to remove it
|
this._watched.delete(path);
|
this._watched.delete(fullPath);
|
const eventName = isDirectory ? EV.UNLINK_DIR : EV.UNLINK;
|
if (wasTracked && !this._isIgnored(path))
|
this._emit(eventName, path);
|
// Avoid conflicts if we later create another file with the same name
|
this._closePath(path);
|
}
|
/**
|
* Closes all watchers for a path
|
*/
|
_closePath(path) {
|
this._closeFile(path);
|
const dir = sysPath.dirname(path);
|
this._getWatchedDir(dir).remove(sysPath.basename(path));
|
}
|
/**
|
* Closes only file-specific watchers
|
*/
|
_closeFile(path) {
|
const closers = this._closers.get(path);
|
if (!closers)
|
return;
|
closers.forEach((closer) => closer());
|
this._closers.delete(path);
|
}
|
_addPathCloser(path, closer) {
|
if (!closer)
|
return;
|
let list = this._closers.get(path);
|
if (!list) {
|
list = [];
|
this._closers.set(path, list);
|
}
|
list.push(closer);
|
}
|
_readdirp(root, opts) {
|
if (this.closed)
|
return;
|
const options = { type: EV.ALL, alwaysStat: true, lstat: true, ...opts, depth: 0 };
|
let stream = readdirp(root, options);
|
this._streams.add(stream);
|
stream.once(STR_CLOSE, () => {
|
stream = undefined;
|
});
|
stream.once(STR_END, () => {
|
if (stream) {
|
this._streams.delete(stream);
|
stream = undefined;
|
}
|
});
|
return stream;
|
}
|
}
|
/**
|
* Instantiates watcher with paths to be tracked.
|
* @param paths file / directory paths
|
* @param options opts, such as `atomic`, `awaitWriteFinish`, `ignored`, and others
|
* @returns an instance of FSWatcher for chaining.
|
* @example
|
* const watcher = watch('.').on('all', (event, path) => { console.log(event, path); });
|
* watch('.', { atomic: true, awaitWriteFinish: true, ignored: (f, stats) => stats?.isFile() && !f.endsWith('.js') })
|
*/
|
export function watch(paths, options = {}) {
|
const watcher = new FSWatcher(options);
|
watcher.add(paths);
|
return watcher;
|
}
|
export default { watch, FSWatcher };
|
