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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const Stats = require("./Stats");
/** @typedef {import("../declarations/WebpackOptions").WatchOptions} WatchOptions */
/** @typedef {import("./Compilation")} Compilation */
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./FileSystemInfo").FileSystemInfoEntry} FileSystemInfoEntry */
/** @typedef {import("./WebpackError")} WebpackError */
/** @typedef {import("./logging/Logger").Logger} Logger */
/** @typedef {import("./util/fs").TimeInfoEntries} TimeInfoEntries */
/** @typedef {import("./util/fs").WatchFileSystem} WatchFileSystem */
/** @typedef {import("./util/fs").Watcher} Watcher */
/**
* @template T
* @callback Callback
* @param {Error | null} err
* @param {T=} result
*/
class Watching {
/**
* @param {Compiler} compiler the compiler
* @param {WatchOptions} watchOptions options
* @param {Callback<Stats>} handler completion handler
*/
constructor(compiler, watchOptions, handler) {
this.startTime = null;
this.invalid = false;
this.handler = handler;
/** @type {Callback<void>[]} */
this.callbacks = [];
/** @type {Callback<void>[] | undefined} */
this._closeCallbacks = undefined;
this.closed = false;
this.suspended = false;
this.blocked = false;
this._isBlocked = () => false;
this._onChange = () => {};
this._onInvalid = () => {};
if (typeof watchOptions === "number") {
/** @type {WatchOptions} */
this.watchOptions = {
aggregateTimeout: watchOptions
};
} else if (watchOptions && typeof watchOptions === "object") {
/** @type {WatchOptions} */
this.watchOptions = { ...watchOptions };
} else {
/** @type {WatchOptions} */
this.watchOptions = {};
}
if (typeof this.watchOptions.aggregateTimeout !== "number") {
this.watchOptions.aggregateTimeout = 20;
}
this.compiler = compiler;
this.running = false;
this._initial = true;
this._invalidReported = true;
this._needRecords = true;
this.watcher = undefined;
this.pausedWatcher = undefined;
/** @type {Set<string> | undefined} */
this._collectedChangedFiles = undefined;
/** @type {Set<string> | undefined} */
this._collectedRemovedFiles = undefined;
this._done = this._done.bind(this);
process.nextTick(() => {
if (this._initial) this._invalidate();
});
}
/**
* @param {ReadonlySet<string> | undefined | null} changedFiles changed files
* @param {ReadonlySet<string> | undefined | null} removedFiles removed files
*/
_mergeWithCollected(changedFiles, removedFiles) {
if (!changedFiles) return;
if (!this._collectedChangedFiles) {
this._collectedChangedFiles = new Set(changedFiles);
this._collectedRemovedFiles = new Set(removedFiles);
} else {
for (const file of changedFiles) {
this._collectedChangedFiles.add(file);
/** @type {Set<string>} */
(this._collectedRemovedFiles).delete(file);
}
for (const file of /** @type {ReadonlySet<string>} */ (removedFiles)) {
this._collectedChangedFiles.delete(file);
/** @type {Set<string>} */
(this._collectedRemovedFiles).add(file);
}
}
}
/**
* @param {TimeInfoEntries=} fileTimeInfoEntries info for files
* @param {TimeInfoEntries=} contextTimeInfoEntries info for directories
* @param {ReadonlySet<string>=} changedFiles changed files
* @param {ReadonlySet<string>=} removedFiles removed files
* @returns {void}
*/
_go(fileTimeInfoEntries, contextTimeInfoEntries, changedFiles, removedFiles) {
this._initial = false;
if (this.startTime === null) this.startTime = Date.now();
this.running = true;
if (this.watcher) {
this.pausedWatcher = this.watcher;
this.lastWatcherStartTime = Date.now();
this.watcher.pause();
this.watcher = null;
} else if (!this.lastWatcherStartTime) {
this.lastWatcherStartTime = Date.now();
}
this.compiler.fsStartTime = Date.now();
if (
changedFiles &&
removedFiles &&
fileTimeInfoEntries &&
contextTimeInfoEntries
) {
this._mergeWithCollected(changedFiles, removedFiles);
this.compiler.fileTimestamps = fileTimeInfoEntries;
this.compiler.contextTimestamps = contextTimeInfoEntries;
} else if (this.pausedWatcher) {
if (this.pausedWatcher.getInfo) {
const {
changes,
removals,
fileTimeInfoEntries,
contextTimeInfoEntries
} = this.pausedWatcher.getInfo();
this._mergeWithCollected(changes, removals);
this.compiler.fileTimestamps = fileTimeInfoEntries;
this.compiler.contextTimestamps = contextTimeInfoEntries;
} else {
this._mergeWithCollected(
this.pausedWatcher.getAggregatedChanges &&
this.pausedWatcher.getAggregatedChanges(),
this.pausedWatcher.getAggregatedRemovals &&
this.pausedWatcher.getAggregatedRemovals()
);
this.compiler.fileTimestamps =
this.pausedWatcher.getFileTimeInfoEntries();
this.compiler.contextTimestamps =
this.pausedWatcher.getContextTimeInfoEntries();
}
}
this.compiler.modifiedFiles = this._collectedChangedFiles;
this._collectedChangedFiles = undefined;
this.compiler.removedFiles = this._collectedRemovedFiles;
this._collectedRemovedFiles = undefined;
const run = () => {
if (this.compiler.idle) {
return this.compiler.cache.endIdle(err => {
if (err) return this._done(err);
this.compiler.idle = false;
run();
});
}
if (this._needRecords) {
return this.compiler.readRecords(err => {
if (err) return this._done(err);
this._needRecords = false;
run();
});
}
this.invalid = false;
this._invalidReported = false;
this.compiler.hooks.watchRun.callAsync(this.compiler, err => {
if (err) return this._done(err);
/**
* @param {Error | null} err error
* @param {Compilation=} _compilation compilation
* @returns {void}
*/
const onCompiled = (err, _compilation) => {
if (err) return this._done(err, _compilation);
const compilation = /** @type {Compilation} */ (_compilation);
if (this.invalid) return this._done(null, compilation);
if (this.compiler.hooks.shouldEmit.call(compilation) === false) {
return this._done(null, compilation);
}
process.nextTick(() => {
const logger = compilation.getLogger("webpack.Compiler");
logger.time("emitAssets");
this.compiler.emitAssets(compilation, err => {
logger.timeEnd("emitAssets");
if (err) return this._done(err, compilation);
if (this.invalid) return this._done(null, compilation);
logger.time("emitRecords");
this.compiler.emitRecords(err => {
logger.timeEnd("emitRecords");
if (err) return this._done(err, compilation);
if (compilation.hooks.needAdditionalPass.call()) {
compilation.needAdditionalPass = true;
compilation.startTime = /** @type {number} */ (
this.startTime
);
compilation.endTime = Date.now();
logger.time("done hook");
const stats = new Stats(compilation);
this.compiler.hooks.done.callAsync(stats, err => {
logger.timeEnd("done hook");
if (err) return this._done(err, compilation);
this.compiler.hooks.additionalPass.callAsync(err => {
if (err) return this._done(err, compilation);
this.compiler.compile(onCompiled);
});
});
return;
}
return this._done(null, compilation);
});
});
});
};
this.compiler.compile(onCompiled);
});
};
run();
}
/**
* @param {Compilation} compilation the compilation
* @returns {Stats} the compilation stats
*/
_getStats(compilation) {
const stats = new Stats(compilation);
return stats;
}
/**
* @param {(Error | null)=} err an optional error
* @param {Compilation=} compilation the compilation
* @returns {void}
*/
_done(err, compilation) {
this.running = false;
const logger =
/** @type {Logger} */
(compilation && compilation.getLogger("webpack.Watching"));
/** @type {Stats | undefined} */
let stats;
/**
* @param {Error} err error
* @param {Callback<void>[]=} cbs callbacks
*/
const handleError = (err, cbs) => {
this.compiler.hooks.failed.call(err);
this.compiler.cache.beginIdle();
this.compiler.idle = true;
this.handler(err, /** @type {Stats} */ (stats));
if (!cbs) {
cbs = this.callbacks;
this.callbacks = [];
}
for (const cb of cbs) cb(err);
};
if (
this.invalid &&
!this.suspended &&
!this.blocked &&
!(this._isBlocked() && (this.blocked = true))
) {
if (compilation) {
logger.time("storeBuildDependencies");
this.compiler.cache.storeBuildDependencies(
compilation.buildDependencies,
err => {
logger.timeEnd("storeBuildDependencies");
if (err) return handleError(err);
this._go();
}
);
} else {
this._go();
}
return;
}
if (compilation) {
compilation.startTime = /** @type {number} */ (this.startTime);
compilation.endTime = Date.now();
stats = new Stats(compilation);
}
this.startTime = null;
if (err) return handleError(err);
const cbs = this.callbacks;
this.callbacks = [];
logger.time("done hook");
this.compiler.hooks.done.callAsync(/** @type {Stats} */ (stats), err => {
logger.timeEnd("done hook");
if (err) return handleError(err, cbs);
this.handler(null, stats);
logger.time("storeBuildDependencies");
this.compiler.cache.storeBuildDependencies(
/** @type {Compilation} */
(compilation).buildDependencies,
err => {
logger.timeEnd("storeBuildDependencies");
if (err) return handleError(err, cbs);
logger.time("beginIdle");
this.compiler.cache.beginIdle();
this.compiler.idle = true;
logger.timeEnd("beginIdle");
process.nextTick(() => {
if (!this.closed) {
this.watch(
/** @type {Compilation} */
(compilation).fileDependencies,
/** @type {Compilation} */
(compilation).contextDependencies,
/** @type {Compilation} */
(compilation).missingDependencies
);
}
});
for (const cb of cbs) cb(null);
this.compiler.hooks.afterDone.call(/** @type {Stats} */ (stats));
}
);
});
}
/**
* @param {Iterable<string>} files watched files
* @param {Iterable<string>} dirs watched directories
* @param {Iterable<string>} missing watched existence entries
* @returns {void}
*/
watch(files, dirs, missing) {
this.pausedWatcher = null;
this.watcher =
/** @type {WatchFileSystem} */
(this.compiler.watchFileSystem).watch(
files,
dirs,
missing,
/** @type {number} */ (this.lastWatcherStartTime),
this.watchOptions,
(
err,
fileTimeInfoEntries,
contextTimeInfoEntries,
changedFiles,
removedFiles
) => {
if (err) {
this.compiler.modifiedFiles = undefined;
this.compiler.removedFiles = undefined;
this.compiler.fileTimestamps = undefined;
this.compiler.contextTimestamps = undefined;
this.compiler.fsStartTime = undefined;
return this.handler(err);
}
this._invalidate(
fileTimeInfoEntries,
contextTimeInfoEntries,
changedFiles,
removedFiles
);
this._onChange();
},
(fileName, changeTime) => {
if (!this._invalidReported) {
this._invalidReported = true;
this.compiler.hooks.invalid.call(fileName, changeTime);
}
this._onInvalid();
}
);
}
/**
* @param {Callback<void>=} callback signals when the build has completed again
* @returns {void}
*/
invalidate(callback) {
if (callback) {
this.callbacks.push(callback);
}
if (!this._invalidReported) {
this._invalidReported = true;
this.compiler.hooks.invalid.call(null, Date.now());
}
this._onChange();
this._invalidate();
}
/**
* @param {TimeInfoEntries=} fileTimeInfoEntries info for files
* @param {TimeInfoEntries=} contextTimeInfoEntries info for directories
* @param {ReadonlySet<string>=} changedFiles changed files
* @param {ReadonlySet<string>=} removedFiles removed files
* @returns {void}
*/
_invalidate(
fileTimeInfoEntries,
contextTimeInfoEntries,
changedFiles,
removedFiles
) {
if (this.suspended || (this._isBlocked() && (this.blocked = true))) {
this._mergeWithCollected(changedFiles, removedFiles);
return;
}
if (this.running) {
this._mergeWithCollected(changedFiles, removedFiles);
this.invalid = true;
} else {
this._go(
fileTimeInfoEntries,
contextTimeInfoEntries,
changedFiles,
removedFiles
);
}
}
suspend() {
this.suspended = true;
}
resume() {
if (this.suspended) {
this.suspended = false;
this._invalidate();
}
}
/**
* @param {Callback<void>} callback signals when the watcher is closed
* @returns {void}
*/
close(callback) {
if (this._closeCallbacks) {
if (callback) {
this._closeCallbacks.push(callback);
}
return;
}
/**
* @param {WebpackError | null} err error if any
* @param {Compilation=} compilation compilation if any
*/
const finalCallback = (err, compilation) => {
this.running = false;
this.compiler.running = false;
this.compiler.watching = undefined;
this.compiler.watchMode = false;
this.compiler.modifiedFiles = undefined;
this.compiler.removedFiles = undefined;
this.compiler.fileTimestamps = undefined;
this.compiler.contextTimestamps = undefined;
this.compiler.fsStartTime = undefined;
/**
* @param {WebpackError | null} err error if any
*/
const shutdown = err => {
this.compiler.hooks.watchClose.call();
const closeCallbacks =
/** @type {Callback<void>[]} */
(this._closeCallbacks);
this._closeCallbacks = undefined;
for (const cb of closeCallbacks) cb(err);
};
if (compilation) {
const logger = compilation.getLogger("webpack.Watching");
logger.time("storeBuildDependencies");
this.compiler.cache.storeBuildDependencies(
compilation.buildDependencies,
err2 => {
logger.timeEnd("storeBuildDependencies");
shutdown(err || err2);
}
);
} else {
shutdown(err);
}
};
this.closed = true;
if (this.watcher) {
this.watcher.close();
this.watcher = null;
}
if (this.pausedWatcher) {
this.pausedWatcher.close();
this.pausedWatcher = null;
}
this._closeCallbacks = [];
if (callback) {
this._closeCallbacks.push(callback);
}
if (this.running) {
this.invalid = true;
this._done = finalCallback;
} else {
finalCallback(null);
}
}
}
module.exports = Watching;