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index.ts
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index.ts
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import { WatchOptions } from 'chokidar';
import { EventEmitter } from 'events';
import path from 'path';
import createFilter from 'rollup-pluginutils/src/createFilter';
import rollup, { setWatcher } from '../rollup/index';
import {
InputOptions,
ModuleJSON,
OutputOptions,
RollupBuild,
RollupCache,
RollupError,
RollupWatcher,
WatcherOptions
} from '../rollup/types';
import mergeOptions, { GenericConfigObject } from '../utils/mergeOptions';
import chokidar from './chokidar';
import { addTask, deleteTask } from './fileWatchers';
const DELAY = 200;
export class Watcher {
emitter: RollupWatcher;
private buildTimeout: NodeJS.Timer | null = null;
private invalidatedIds: Set<string> = new Set();
private rerun = false;
private running: boolean;
private tasks: Task[];
constructor(configs: GenericConfigObject[] | GenericConfigObject) {
this.emitter = new (class extends EventEmitter implements RollupWatcher {
close: () => void;
constructor(close: () => void) {
super();
this.close = close;
// Allows more than 10 bundles to be watched without
// showing the `MaxListenersExceededWarning` to the user.
this.setMaxListeners(Infinity);
}
})(this.close.bind(this));
this.tasks = (Array.isArray(configs) ? configs : configs ? [configs] : []).map(
config => new Task(this, config)
);
this.running = true;
process.nextTick(() => this.run());
}
close() {
if (this.buildTimeout) clearTimeout(this.buildTimeout);
for (const task of this.tasks) {
task.close();
}
this.emitter.removeAllListeners();
}
emit(event: string, value?: any) {
this.emitter.emit(event, value);
}
invalidate(id?: string) {
if (id) {
this.invalidatedIds.add(id);
}
if (this.running) {
this.rerun = true;
return;
}
if (this.buildTimeout) clearTimeout(this.buildTimeout);
this.buildTimeout = setTimeout(() => {
this.buildTimeout = null;
for (const id of this.invalidatedIds) {
this.emit('change', id);
}
this.invalidatedIds.clear();
this.emit('restart');
this.run();
}, DELAY);
}
private run() {
this.running = true;
this.emit('event', {
code: 'START'
});
let taskPromise = Promise.resolve();
for (const task of this.tasks) taskPromise = taskPromise.then(() => task.run());
return taskPromise
.then(() => {
this.running = false;
this.emit('event', {
code: 'END'
});
})
.catch(error => {
this.running = false;
this.emit('event', {
code: 'ERROR',
error
});
})
.then(() => {
if (this.rerun) {
this.rerun = false;
this.invalidate();
}
});
}
}
export class Task {
cache: RollupCache;
watchFiles: string[] = [];
private chokidarOptions: WatchOptions;
private chokidarOptionsHash: string;
private closed: boolean;
private filter: (id: string) => boolean;
private inputOptions: InputOptions;
private invalidated = true;
private outputFiles: string[];
private outputs: OutputOptions[];
private watched: Set<string>;
private watcher: Watcher;
constructor(watcher: Watcher, config: GenericConfigObject) {
this.cache = null as any;
this.watcher = watcher;
this.closed = false;
this.watched = new Set();
const { inputOptions, outputOptions } = mergeOptions({
config
});
this.inputOptions = inputOptions;
this.outputs = outputOptions;
this.outputFiles = this.outputs.map(output => {
if (output.file || output.dir) return path.resolve(output.file || (output.dir as string));
return undefined as any;
});
const watchOptions: WatcherOptions = inputOptions.watch || {};
if ('useChokidar' in watchOptions)
(watchOptions as any).chokidar = (watchOptions as any).useChokidar;
let chokidarOptions = 'chokidar' in watchOptions ? watchOptions.chokidar : !!chokidar;
if (chokidarOptions) {
chokidarOptions = {
...(chokidarOptions === true ? {} : chokidarOptions),
disableGlobbing: true,
ignoreInitial: true
};
}
if (chokidarOptions && !chokidar) {
throw new Error(
`watch.chokidar was provided, but chokidar could not be found. Have you installed it?`
);
}
this.chokidarOptions = chokidarOptions as WatchOptions;
this.chokidarOptionsHash = JSON.stringify(chokidarOptions);
this.filter = createFilter(watchOptions.include, watchOptions.exclude);
}
close() {
this.closed = true;
for (const id of this.watched) {
deleteTask(id, this, this.chokidarOptionsHash);
}
}
invalidate(id: string, isTransformDependency: boolean) {
this.invalidated = true;
if (isTransformDependency) {
for (const module of this.cache.modules as ModuleJSON[]) {
if (!module.transformDependencies || module.transformDependencies.indexOf(id) === -1)
return;
// effective invalidation
module.originalCode = null as any;
}
}
this.watcher.invalidate(id);
}
run() {
if (!this.invalidated) return;
this.invalidated = false;
const options = {
...this.inputOptions,
cache: this.cache
};
const start = Date.now();
this.watcher.emit('event', {
code: 'BUNDLE_START',
input: this.inputOptions.input,
output: this.outputFiles
});
setWatcher(this.watcher.emitter);
return rollup(options)
.then(result => {
if (this.closed) return undefined as any;
this.updateWatchedFiles(result);
return Promise.all(this.outputs.map(output => result.write(output))).then(() => result);
})
.then((result: RollupBuild) => {
this.watcher.emit('event', {
code: 'BUNDLE_END',
duration: Date.now() - start,
input: this.inputOptions.input,
output: this.outputFiles,
result
});
})
.catch((error: RollupError) => {
if (this.closed) return;
if (Array.isArray(error.watchFiles)) {
for (const id of error.watchFiles) {
this.watchFile(id);
}
}
throw error;
});
}
private updateWatchedFiles(result: RollupBuild) {
const previouslyWatched = this.watched;
this.watched = new Set();
this.watchFiles = result.watchFiles;
this.cache = result.cache;
for (const id of this.watchFiles) {
this.watchFile(id);
}
if (this.cache.modules) {
for (const module of this.cache.modules) {
if (module.transformDependencies) {
for (const depId of module.transformDependencies) {
this.watchFile(depId, true);
}
}
}
}
for (const id of previouslyWatched) {
if (!this.watched.has(id)) deleteTask(id, this, this.chokidarOptionsHash);
}
}
private watchFile(id: string, isTransformDependency = false) {
if (!this.filter(id)) return;
this.watched.add(id);
if (this.outputFiles.some(file => file === id)) {
throw new Error('Cannot import the generated bundle');
}
// this is necessary to ensure that any 'renamed' files
// continue to be watched following an error
addTask(id, this, this.chokidarOptions, this.chokidarOptionsHash, isTransformDependency);
}
}
export default function watch(configs: GenericConfigObject[] | GenericConfigObject): RollupWatcher {
return new Watcher(configs).emitter;
}