chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

server/models/GroupUser.ts

@@ -0,0 +1,37 @@
+import { sequelize } from "../sequelize";
+
+const GroupUser = sequelize.define(
+  "group_user",
+  {},
+  {
+    timestamps: true,
+    paranoid: true,
+  }
+);
+
+// @ts-expect-error ts-migrate(7006) FIXME: Parameter 'models' implicitly has an 'any' type.
+GroupUser.associate = (models) => {
+  GroupUser.belongsTo(models.Group, {
+    as: "group",
+    foreignKey: "groupId",
+    primary: true,
+  });
+  GroupUser.belongsTo(models.User, {
+    as: "user",
+    foreignKey: "userId",
+    primary: true,
+  });
+  GroupUser.belongsTo(models.User, {
+    as: "createdBy",
+    foreignKey: "createdById",
+  });
+  GroupUser.addScope("defaultScope", {
+    include: [
+      {
+        association: "user",
+      },
+    ],
+  });
+};
+
+export default GroupUser;