set up mock shape server

package-lock.json

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+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/vite-node/-/vite-node-3.2.4.tgz",
+      "integrity": "sha512-EbKSKh+bh1E1IFxeO0pg1n4dvoOTt0UDiXMd/qn++r98+jPO1xtJilvXldeuQ8giIB5IkpjCgMleHMNEsGH6pg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cac": "^6.7.14",
+        "debug": "^4.4.1",
+        "es-module-lexer": "^1.7.0",
+        "pathe": "^2.0.3",
+        "vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0"
+      },
+      "bin": {
+        "vite-node": "vite-node.mjs"
+      },
+      "engines": {
+        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      }
+    },
     "node_modules/vite-plugin-vue-devtools": {
       "version": "7.7.7",
       "resolved": "https://registry.npmjs.org/vite-plugin-vue-devtools/-/vite-plugin-vue-devtools-7.7.7.tgz",
@@ -6137,6 +6458,79 @@
         }
       }
     },
+    "node_modules/vitest": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-3.2.4.tgz",
+      "integrity": "sha512-LUCP5ev3GURDysTWiP47wRRUpLKMOfPh+yKTx3kVIEiu5KOMeqzpnYNsKyOoVrULivR8tLcks4+lga33Whn90A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/chai": "^5.2.2",
+        "@vitest/expect": "3.2.4",
+        "@vitest/mocker": "3.2.4",
+        "@vitest/pretty-format": "^3.2.4",
+        "@vitest/runner": "3.2.4",
+        "@vitest/snapshot": "3.2.4",
+        "@vitest/spy": "3.2.4",
+        "@vitest/utils": "3.2.4",
+        "chai": "^5.2.0",
+        "debug": "^4.4.1",
+        "expect-type": "^1.2.1",
+        "magic-string": "^0.30.17",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.2",
+        "std-env": "^3.9.0",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^0.3.2",
+        "tinyglobby": "^0.2.14",
+        "tinypool": "^1.1.1",
+        "tinyrainbow": "^2.0.0",
+        "vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0",
+        "vite-node": "3.2.4",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@types/debug": "^4.1.12",
+        "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
+        "@vitest/browser": "3.2.4",
+        "@vitest/ui": "3.2.4",
+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@types/debug": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/vue": {
       "version": "3.5.19",
       "license": "MIT",
@@ -6206,6 +6600,23 @@
         "node": ">=4"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/widest-line": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-5.0.0.tgz",

package.json

@@ -8,15 +8,16 @@
     "start": "astro dev",
     "build": "astro build",
     "preview": "astro preview",
-    "astro": "astro"
+    "astro": "astro",
+    "test": "vitest"
   },
   "dependencies": {
-    "@types/react": "19.1.10",
-    "@types/react-dom": "19.1.7",
-    "astro": "5.13.2",
     "@astrojs/react": "4.3.0",
     "@astrojs/svelte": "7.1.0",
     "@astrojs/vue": "^5.1.0",
+    "@types/react": "19.1.10",
+    "@types/react-dom": "19.1.7",
+    "astro": "5.13.2",
     "react": "19.1.1",
     "react-dom": "19.1.1",
     "svelte": "5.38.2",
@@ -26,6 +27,7 @@
     "@types/node": "24.3.0",
     "@types/react": "19.1.10",
     "@types/react-dom": "19.1.7",
-    "vite": "7.1.3"
+    "vite": "7.1.3",
+    "vitest": "^3.2.4"
   }
 }

src/ng-mock/js-land/connector/applyDiff.ts

@@ -0,0 +1,6 @@
+import type { Diff } from "../types";
+
+/** Mock function to apply diffs. Just uses a copy of the diff as the new object. */
+export function applyDiff(currentState: object, diff: Diff): object {
+  return JSON.parse(JSON.stringify(diff));
+}

src/ng-mock/js-land/connector/connector.ts

@@ -1,4 +0,0 @@
-// Requires functions
-// - initializeConnection
-// - sendUpdateToDb
-// - onDbUpdate

src/ng-mock/js-land/connector/ngSignals.ts

@@ -1,2 +1,31 @@
-// Requires functions
+import handleShapeUpdate from "src/ng-mock/wasm-land/handleShapeUpdate";
-// - createSignalForShape()
+import type { Connection, Diff, Scope, Shape } from "../types";
+import handleShapeRequest from "src/ng-mock/wasm-land/handleShapeRequest";
+import { applyDiff } from "./applyDiff";
+
+export async function createSignalObjectForShape(shape: Shape, scope?: Scope) {
+  const ret: {
+    state?: any;
+    connectionId?: Connection["id"];
+    update: (diff: Diff) => Promise<void>;
+  } = {
+    async update(diff) {
+      if (!ret.connectionId)
+        throw new Error("Connection not established yet for shape" + shape);
+      await handleShapeUpdate(ret.connectionId, diff);
+    },
+  };
+
+  const onDbUpdate = (diff: Diff) => {
+    ret.state = applyDiff(ret.state || {}, diff);
+  };
+
+  await handleShapeRequest(shape, onDbUpdate).then(
+    ({ connectionId, shapeObject }) => {
+      ret.state = shapeObject;
+      ret.connectionId = connectionId;
+    }
+  );
+
+  return ret;
+}

src/ng-mock/js-land/types.ts

@@ -0,0 +1,14 @@
+/** The shape of an object requested. */
+export type Shape = "Shape1" | "Shape2";
+
+/** The Scope of a shape request */
+export type Scope = string | string[];
+
+/** The diff format used to communicate updates between wasm-land and js-land. */
+export type Diff = object;
+
+/** A connection established between wasm-land and js-land for subscription of a shape. */
+export type Connection = {
+  id: string;
+  onUpdateFromWasm: (diff: Diff) => void;
+};

src/ng-mock/tests/updatesWithWasm.test.ts

@@ -0,0 +1,23 @@
+import { expect, test } from "vitest";
+import { createSignalObjectForShape } from "../js-land/connector/ngSignals";
+
+test("shape object notification comes back to others", async () => {
+  const object1 = await createSignalObjectForShape("Shape1");
+  const object2 = await createSignalObjectForShape("Shape1");
+
+  const object3 = await createSignalObjectForShape("Shape2");
+  const object4 = await createSignalObjectForShape("Shape2");
+
+  // Update object 1 and expect object 2 to update as well.
+  await object1.update({ name: "Updated name from object1" });
+
+  expect(object2.state?.name).toBe("Updated name from object1");
+
+  // Expect object of different shape not to have changed.
+  expect(object3.state?.name).toBe("Niko's cat");
+
+  // Update object 4 and expect object 3 with same shape to have updated.
+  await object4.update({ name: "Updated name from object4" });
+
+  expect(object3.state?.name).toBe("Updated name from object4");
+});

src/ng-mock/wasm-land/handleShapeRequest.ts

@@ -0,0 +1,50 @@
+import { randomUUID } from "crypto";
+import * as shapeManager from "./shapeManager";
+import type { WasmConnection, Diff } from "./types";
+import type { Shape } from "../js-land/types";
+
+const mockShapeObject1 = {
+  type: "Person",
+  name: "Bob",
+  address: {
+    street: "First street",
+    houseNumber: "15",
+  },
+  hasChildren: true,
+  numberOfHouses: 0,
+};
+const mockShapeObject2 = {
+  type: "Cat",
+  name: "Niko's cat",
+  age: 12,
+  numberOfHomes: 3,
+  address: {
+    street: "Niko's street",
+    compartment: 2,
+  },
+};
+
+export default async function handleShapeRequest(
+  shape: Shape,
+  callback: (diff: Diff, connectionId: WasmConnection["id"]) => void
+): Promise<{
+  connectionId: string;
+  shapeObject: object;
+}> {
+  const connection: WasmConnection = {
+    id: randomUUID(),
+    shape,
+    // Create a deep copy to prevent accidental by-reference changes.
+    state: JSON.parse(
+      JSON.stringify(shape === "Shape1" ? mockShapeObject1 : mockShapeObject2)
+    ),
+    callback,
+  };
+
+  shapeManager.connections.set(connection.id, connection);
+
+  return {
+    connectionId: connection.id,
+    shapeObject: connection.state,
+  };
+}

src/ng-mock/wasm-land/handleShapeUpdate.ts

@@ -0,0 +1,20 @@
+import * as shapeManager from "./shapeManager";
+import type { WasmConnection, Diff } from "./types";
+
+export default async function handleShapeUpdate(
+  connectionId: WasmConnection["id"],
+  diff: Diff
+) {
+  const connection = shapeManager.connections.get(connectionId);
+  if (!connection) throw new Error("No Connection found.");
+
+  const newState = shapeManager.applyDiff(connection.state, diff);
+  connection.state = newState;
+
+  shapeManager.connections.forEach((con) => {
+    if (con.shape == connection.shape) {
+      con.state = newState;
+      con.callback(diff, con.id);
+    }
+  });
+}

src/ng-mock/wasm-land/shapeManager.ts

@@ -0,0 +1,10 @@
+import type { Diff, ObjectState, WasmConnection } from "./types";
+
+const connections: Map<WasmConnection["id"], WasmConnection> = new Map();
+
+/** Mock function to apply diffs. Just uses a copy of the diff as the new object. */
+export function applyDiff(currentState: ObjectState, diff: Diff): ObjectState {
+  return JSON.parse(JSON.stringify(diff));
+}
+
+export { connections };

src/ng-mock/wasm-land/types.ts

@@ -0,0 +1,17 @@
+import type { Shape } from "../js-land/types";
+
+/** The Scope of a shape request */
+export type Scope = string | string[];
+
+/** The diff format used to communicate updates between wasm-land and js-land. */
+export type Diff = object;
+
+export type ObjectState = object;
+
+/** A connection established between wasm-land and js-land for subscription of a shape. */
+export type WasmConnection = {
+  id: string;
+  shape: Shape;
+  state: ObjectState;
+  callback: (diff: Diff, connectionId: WasmConnection["id"]) => void;
+};