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/Notification.ts

@@ -0,0 +1,36 @@
+import { DataTypes, sequelize } from "../sequelize";
+
+const Notification = sequelize.define(
+  "notification",
+  {
+    id: {
+      type: DataTypes.UUID,
+      defaultValue: DataTypes.UUIDV4,
+      primaryKey: true,
+    },
+    event: {
+      type: DataTypes.STRING,
+    },
+    email: {
+      type: DataTypes.BOOLEAN,
+    },
+  },
+  {
+    timestamps: true,
+    updatedAt: false,
+  }
+);
+
+// @ts-expect-error ts-migrate(7006) FIXME: Parameter 'models' implicitly has an 'any' type.
+Notification.associate = (models) => {
+  Notification.belongsTo(models.User, {
+    as: "actor",
+    foreignKey: "actorId",
+  });
+  Notification.belongsTo(models.User, {
+    as: "user",
+    foreignKey: "userId",
+  });
+};
+
+export default Notification;