Function watchPackageDataPlugin

packages/vite/src/node/packages.ts:254–289

(packageCache: PackageCache)

}

export function watchPackageDataPlugin(packageCache: PackageCache): Plugin {
  // a list of files to watch before the plugin is ready
  const watchQueue = new Set<string>()
  const watchedDirs = new Set<string>()

  const watchFileStub = (id: string) => {
    watchQueue.add(id)
  }
  let watchFile = watchFileStub

  const setPackageData = packageCache.set.bind(packageCache)
  packageCache.set = (id, pkg) => {
    if (!isInNodeModules(pkg.dir) && !watchedDirs.has(pkg.dir)) {
      watchedDirs.add(pkg.dir)
      watchFile(path.join(pkg.dir, 'package.json'))
    }
    return setPackageData(id, pkg)
  }

  return {
    name: 'vite:watch-package-data',
    buildStart() {
      watchFile = this.addWatchFile.bind(this)
      watchQueue.forEach(watchFile)
      watchQueue.clear()
    },
    buildEnd() {
      watchFile = watchFileStub
    },
    watchChange(id) {
      if (id.endsWith('/package.json')) {
        invalidatePackageData(packageCache, path.normalize(id))
      }
    },
  }
}

/**
 * Get cached `resolvePackageData` value based on `basedir`. When one is found,