feat: impl automatic database migrations (exp)

packages/core/api/migrations.js

@@ -0,0 +1,63 @@
+const CURRENT_VERSION = 3;
+class Migrations {
+  /**
+   *
+   * @param {import("./index").default} db
+   */
+  constructor(db) {
+    this._db = db;
+    this.dbVersion = CURRENT_VERSION;
+  }
+
+  async init() {
+    this.dbVersion = (await this._db.context.read("v")) || 2;
+  }
+
+  get _shouldMigrate() {
+    return this.dbVersion < CURRENT_VERSION;
+  }
+
+  _migrationFunction(collectionId) {
+    let migrationFunction = migrations[version][collectionId];
+    if (!migrationFunction)
+      migrationFunction = migrations[CURRENT_VERSION][collectionId];
+    return migrationFunction;
+  }
+
+  async migrate() {
+    if (!this._shouldMigrate) return;
+    const collections = [
+      "notes",
+      "notebooks",
+      "tags",
+      "colors",
+      "trash",
+      "delta",
+      "text",
+      "content",
+      "settings",
+    ];
+
+    await Promise.all(
+      collections.map(async (collectionId) => {
+        const collection = this._db[collectionId];
+        if (!collection) return;
+
+        const items =
+          collectionId === "content" || collectionId === "delta"
+            ? await collection.all()
+            : collectionId === "settings"
+            ? [collection.raw]
+            : collection.raw;
+
+        await Promise.all(
+          items.map(async (item) => {
+            await this._migrationFunction(collectionId)(this._db, item);
+          })
+        );
+      })
+    );
+    await this._db.context.write("v", CURRENT_VERSION);
+  }
+}
+export default Migrations;