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Allow plugins/presets to indicate external dependencies (#14065)
Co-authored-by: Vedant Roy <vroy101@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| import { createRequire } from "module"; | ||
| import path from "path"; | ||
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| const fileToDeps = new Map<string, Set<string>>(); | ||
| const depToFiles = new Map<string, Set<string>>(); | ||
|
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| let isWatchMode = false; | ||
| let watcher; | ||
|
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| export function enable({ enableGlobbing }: { enableGlobbing: boolean }) { | ||
| isWatchMode = true; | ||
|
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| const { FSWatcher } = requireChokidar(); | ||
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| watcher = new FSWatcher({ | ||
| disableGlobbing: !enableGlobbing, | ||
| persistent: true, | ||
| ignoreInitial: true, | ||
| awaitWriteFinish: { | ||
| stabilityThreshold: 50, | ||
| pollInterval: 10, | ||
| }, | ||
| }); | ||
|
|
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| watcher.on("unlink", unwatchFile); | ||
| } | ||
|
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| export function watch(filename: string): void { | ||
| if (!isWatchMode) { | ||
| throw new Error( | ||
| "Internal Babel error: .watch called when not in watch mode.", | ||
| ); | ||
| } | ||
|
|
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| watcher.add(path.resolve(filename)); | ||
| } | ||
|
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| /** | ||
| * Call @param callback whenever a dependency (source file)/ | ||
| * external dependency (non-source file) changes. | ||
| * | ||
| * Handles mapping external dependencies to their corresponding | ||
| * dependencies. | ||
| */ | ||
| export function onFilesChange( | ||
| callback: (filenames: string[], event: string, cause: string) => void, | ||
| ): void { | ||
| if (!isWatchMode) { | ||
| throw new Error( | ||
| "Internal Babel error: .onFilesChange called when not in watch mode.", | ||
| ); | ||
| } | ||
|
|
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| watcher.on("all", (event, filename) => { | ||
| if (event !== "change" && event !== "add") return; | ||
|
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| const absoluteFile = path.resolve(filename); | ||
| callback( | ||
| [absoluteFile, ...(depToFiles.get(absoluteFile) ?? [])], | ||
| event, | ||
| absoluteFile, | ||
| ); | ||
| }); | ||
| } | ||
|
|
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| export function updateExternalDependencies( | ||
| filename: string, | ||
| dependencies: Set<string>, | ||
| ) { | ||
| if (!isWatchMode) return; | ||
|
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| // Use absolute paths | ||
| const absFilename = path.resolve(filename); | ||
| const absDependencies = new Set( | ||
| Array.from(dependencies, dep => path.resolve(dep)), | ||
| ); | ||
|
|
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| if (fileToDeps.has(absFilename)) { | ||
| for (const dep of fileToDeps.get(absFilename)) { | ||
| if (!absDependencies.has(dep)) { | ||
| removeFileDependency(absFilename, dep); | ||
| } | ||
| } | ||
| } | ||
| for (const dep of absDependencies) { | ||
| if (!depToFiles.has(dep)) { | ||
| depToFiles.set(dep, new Set()); | ||
|
|
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| watcher.add(dep); | ||
| } | ||
| depToFiles.get(dep).add(absFilename); | ||
| } | ||
|
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| fileToDeps.set(absFilename, absDependencies); | ||
| } | ||
|
|
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| function removeFileDependency(filename: string, dep: string) { | ||
| depToFiles.get(dep).delete(filename); | ||
|
|
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| if (depToFiles.get(dep).size === 0) { | ||
| depToFiles.delete(dep); | ||
|
|
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| watcher.unwatch(dep); | ||
| } | ||
| } | ||
|
|
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| function unwatchFile(filename: string) { | ||
| if (!fileToDeps.has(filename)) return; | ||
|
|
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| for (const dep of fileToDeps.get(filename)) { | ||
| removeFileDependency(filename, dep); | ||
| } | ||
| fileToDeps.delete(filename); | ||
| } | ||
|
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| function requireChokidar(): any { | ||
| // @ts-expect-error - TS is not configured to support import.meta. | ||
| const require = createRequire(import.meta.url); | ||
|
|
||
| try { | ||
| return process.env.BABEL_8_BREAKING | ||
| ? require("chokidar") | ||
| : parseInt(process.versions.node) >= 8 | ||
| ? require("chokidar") | ||
| : require("@nicolo-ribaudo/chokidar-2"); | ||
| } catch (err) { | ||
| console.error( | ||
| "The optional dependency chokidar failed to install and is required for " + | ||
| "--watch. Chokidar is likely not supported on your platform.", | ||
| ); | ||
| throw err; | ||
| } | ||
| } |
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