Migrate server to ESM

Sorry for the very big commit that may lead to git log issues and merge
conflicts, but it's a major step forward:

 * Server can be faster at startup because imports() are async and we can
   easily lazy import big modules
 * Angular doesn't seem to support ES import (with .js extension), so we
   had to correctly organize peertube into a monorepo:
    * Use yarn workspace feature
    * Use typescript reference projects for dependencies
    * Shared projects have been moved into "packages", each one is now a
      node module (with a dedicated package.json/tsconfig.json)
    * server/tools have been moved into apps/ and is now a dedicated app
      bundled and published on NPM so users don't have to build peertube
      cli tools manually
    * server/tests have been moved into packages/ so we don't compile
      them every time we want to run the server
 * Use isolatedModule option:
   * Had to move from const enum to const
     (https://www.typescriptlang.org/docs/handbook/enums.html#objects-vs-enums)
   * Had to explictely specify "type" imports when used in decorators
 * Prefer tsx (that uses esbuild under the hood) instead of ts-node to
   load typescript files (tests with mocha or scripts):
     * To reduce test complexity as esbuild doesn't support decorator
       metadata, we only test server files that do not import server
       models
     * We still build tests files into js files for a faster CI
 * Remove unmaintained peertube CLI import script
 * Removed some barrels to speed up execution (less imports)

1 files changed, 58 insertions, 0 deletions

diff --git a/packages/tests/src/shared/webtorrent.ts b/packages/tests/src/shared/webtorrent.ts
new file mode 100644
index 000000000..1be54426a
--- /dev/null
+++ b/packages/tests/src/shared/webtorrent.ts
@@ -0,0 +1,58 @@
+import { expect } from 'chai'
+import { readFile } from 'fs/promises'
+import parseTorrent from 'parse-torrent'
+import { basename, join } from 'path'
+import type { Instance, Torrent } from 'webtorrent'
+import { VideoFile } from '@peertube/peertube-models'
+import { PeerTubeServer } from '@peertube/peertube-server-commands'
+
+let webtorrent: Instance
+
+export async function checkWebTorrentWorks (magnetUri: string, pathMatch?: RegExp) {
+  const torrent = await webtorrentAdd(magnetUri, true)
+
+  expect(torrent.files).to.be.an('array')
+  expect(torrent.files.length).to.equal(1)
+  expect(torrent.files[0].path).to.exist.and.to.not.equal('')
+
+  if (pathMatch) {
+    expect(torrent.files[0].path).match(pathMatch)
+  }
+}
+
+export async function parseTorrentVideo (server: PeerTubeServer, file: VideoFile) {
+  const torrentName = basename(file.torrentUrl)
+  const torrentPath = server.servers.buildDirectory(join('torrents', torrentName))
+
+  const data = await readFile(torrentPath)
+
+  return parseTorrent(data)
+}
+
+// ---------------------------------------------------------------------------
+// Private
+// ---------------------------------------------------------------------------
+
+async function webtorrentAdd (torrentId: string, refreshWebTorrent = false) {
+  const WebTorrent = (await import('webtorrent')).default
+
+  if (webtorrent && refreshWebTorrent) webtorrent.destroy()
+  if (!webtorrent || refreshWebTorrent) webtorrent = new WebTorrent()
+
+  webtorrent.on('error', err => console.error('Error in webtorrent', err))
+
+  return new Promise<Torrent>(res => {
+    const torrent = webtorrent.add(torrentId, res)
+
+    torrent.on('error', err => console.error('Error in webtorrent torrent', err))
+    torrent.on('warning', warn => {
+      const msg = typeof warn === 'string'
+        ? warn
+        : warn.message
+
+      if (msg.includes('Unsupported')) return
+
+      console.error('Warning in webtorrent torrent', warn)
+    })
+  })
+}