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)

2 files changed, 34 insertions, 0 deletions

diff --git a/apps/peertube-cli/scripts/build.js b/apps/peertube-cli/scripts/build.js
new file mode 100644
index 000000000..a9139acfa
--- /dev/null
+++ b/apps/peertube-cli/scripts/build.js
@@ -0,0 +1,27 @@
+import * as esbuild from 'esbuild'
+import { readFileSync } from 'fs'
+
+const packageJSON = JSON.parse(readFileSync(new URL('../package.json', import.meta.url)))
+
+export const esbuildOptions = {
+  entryPoints: [ './src/peertube.ts' ],
+  bundle: true,
+  platform: 'node',
+  format: 'esm',
+  target: 'node16',
+  external: [
+    './lib-cov/fluent-ffmpeg',
+    'pg-hstore'
+  ],
+  outfile: './dist/peertube.js',
+  banner: {
+    js: `const require = (await import("node:module")).createRequire(import.meta.url);` +
+      `const __filename = (await import("node:url")).fileURLToPath(import.meta.url);` +
+      `const __dirname = (await import("node:path")).dirname(__filename);`
+  },
+  define: {
+    'process.env.PACKAGE_VERSION': `'${packageJSON.version}'`
+  }
+}
+
+await esbuild.build(esbuildOptions)
diff --git a/apps/peertube-cli/scripts/watch.js b/apps/peertube-cli/scripts/watch.js
new file mode 100644
index 000000000..94e57199c
--- /dev/null
+++ b/apps/peertube-cli/scripts/watch.js
@@ -0,0 +1,7 @@
+import * as esbuild from 'esbuild'
+import { esbuildOptions } from './build.js'
+
+const context = await esbuild.context(esbuildOptions)
+
+// Enable watch mode
+await context.watch()