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, 6 insertions, 9 deletions

diff --git a/support/doc/development/tests.md b/support/doc/development/tests.md
index 1c2589c8a..2e4c6ff6a 100644
--- a/support/doc/development/tests.md
+++ b/support/doc/development/tests.md
@@ -8,7 +8,7 @@ Prepare PostgreSQL user so PeerTube can delete/create the test databases:
 sudo -u postgres createuser you_username --createdb --superuser
 ```
 
-Prepare databases:
+Prepare the databases:
 
 ```bash
 npm run clean:server:test
@@ -45,22 +45,19 @@ sudo apt-get install parallel libimage-exiftool-perl
 
 ### Test
 
-To run all test suites:
+To run all test suites (can be long!):
 
 ```bash
 npm run test # See scripts/test.sh to run a particular suite
 ```
 
-Most of tests can be run using:
+To run a specific test:
 
 ```bash
-TS_NODE_TRANSPILE_ONLY=true npm run mocha -- --timeout 30000 --exit -r ts-node/register -r tsconfig-paths/register --bail server/tests/api/videos/video-transcoder.ts
-```
-
-`server/tests/api/activitypub` tests will need different options:
+npm run mocha -- --exit --bail packages/tests/src/your-test.ts
 
-```
-TS_NODE_FILES=true mocha -- --timeout 30000 --exit -r ts-node/register -r tsconfig-paths/register --bail server/tests/api/activitypub/security.ts
+# For example
+npm run mocha -- --exit --bail packages/tests/src/api/videos/single-server.ts
 ```
 
 ### Configuration