init

packages/fs-memory/.gitignore

@@ -0,0 +1,2 @@
+/node_modules/
+/dist/

packages/fs-memory/package.json

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+{
+  "name": "@plaindb/fs-memory",
+  "version": "1.0.0",
+  "type": "module",
+  "main": "dist/exports.js",
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "tsc --build"
+  },
+  "dependencies": {
+    "@plaindb/plaindb": "workspace:*"
+  },
+  "devDependencies": {
+    "@types/node": "^22.10.1",
+    "typescript": "^5.7.2"
+  }
+}

packages/fs-memory/src/exports.ts

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+import { FileSystem } from '@plaindb/plaindb';
+
+type MemoryFileSystemOptions = {
+  documents?: Record<string, Buffer>;
+};
+
+class MemoryFileSystem extends FileSystem {
+  #options: MemoryFileSystemOptions;
+  #files: Record<string, Buffer | undefined>;
+
+  constructor(options: MemoryFileSystemOptions = {}) {
+    super();
+    this.#options = options;
+    this.#files = {
+      ...this.#options.documents,
+    };
+  }
+
+  public get = async (location: string): Promise<Buffer | undefined> => {
+    return this.#files[location];
+  };
+
+  public set = async (location: string, data: Buffer): Promise<void> => {
+    this.#files[location] = data;
+  };
+
+  public update = async (files: Record<string, Buffer | undefined>) => {
+    this.#files = {
+      ...this.#files,
+      ...files,
+    };
+    this.emit('changed', Object.keys(files));
+  };
+}
+
+export { MemoryFileSystem };

packages/fs-memory/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist"
+  },
+  "include": [
+    "src"
+  ]
+}