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, 3 insertions, 7 deletions

diff --git a/tsconfig.base.json b/tsconfig.base.json
index 18ba8f06c..cce74235b 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -1,11 +1,12 @@
 {
   "compilerOptions": {
-    "module": "commonjs",
-    "target": "es2015",
+    "module": "NodeNext",
+    "target": "ES2017",
     "noImplicitAny": false,
     "sourceMap": true,
     "experimentalDecorators": true,
     "emitDecoratorMetadata": true,
+    "isolatedModules": true,
     "importHelpers": true,
     "removeComments": true,
     "esModuleInterop": true,
@@ -19,11 +20,6 @@
       "es2019"
     ],
     "baseUrl": "./",
-    "paths": {
-      "@server/*": [ "server/*" ],
-      "@shared/*": [ "shared/*" ],
-      "@client/*": [ "client/src/*" ]
-    },
     "resolveJsonModule": true,
     "strict": false,
     "strictBindCallApply": true,