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/Backlink.ts

@@ -0,0 +1,27 @@
+import { DataTypes, sequelize } from "../sequelize";
+
+const Backlink = sequelize.define("backlink", {
+  id: {
+    type: DataTypes.UUID,
+    defaultValue: DataTypes.UUIDV4,
+    primaryKey: true,
+  },
+});
+
+// @ts-expect-error ts-migrate(7006) FIXME: Parameter 'models' implicitly has an 'any' type.
+Backlink.associate = (models) => {
+  Backlink.belongsTo(models.Document, {
+    as: "document",
+    foreignKey: "documentId",
+  });
+  Backlink.belongsTo(models.Document, {
+    as: "reverseDocument",
+    foreignKey: "reverseDocumentId",
+  });
+  Backlink.belongsTo(models.User, {
+    as: "user",
+    foreignKey: "userId",
+  });
+};
+
+export default Backlink;