chore: frontend refactor (#32)

* chore: target `1.x` workflows

* chore: switch to `yarn`

* chore: update tsconfig

* refactor: change file colocation

* chore: raise core minimum

* refactor: use frontend extenders

* feat: add shims

* chore: typescript refactor

* chore: change typings, convert to Date

.github/workflows/backend.yml

@@ -4,7 +4,7 @@ on: [workflow_dispatch, push, pull_request]
 
 jobs:
   run:
-    uses: flarum/framework/.github/workflows/REUSABLE_backend.yml@main
+    uses: flarum/framework/.github/workflows/REUSABLE_backend.yml@1.x
     with:
       enable_backend_testing: false
       enable_phpstan: true

.github/workflows/frontend.yml

@@ -4,15 +4,15 @@ on: [workflow_dispatch, push, pull_request]
 
 jobs:
   run:
-    uses: flarum/framework/.github/workflows/REUSABLE_frontend.yml@main
+    uses: flarum/framework/.github/workflows/REUSABLE_frontend.yml@1.x
     with:
       enable_bundlewatch: false
       enable_prettier: true
       enable_typescript: true
 
       frontend_directory: ./js
       backend_directory: .
-      js_package_manager: npm
+      js_package_manager: yarn
       main_git_branch: master
 
     secrets:

composer.json

@@ -22,7 +22,7 @@
     ],
     "require": {
         "php": "^7.4 || ^8.0",
-        "flarum/core": "^1.2.0"
+        "flarum/core": "^1.7.0"
     },
     "authors": [
         {