add tag info for ember-inspector

packages/@glimmer-workspace/integration-tests/lib/setup-harness.ts

@@ -63,6 +63,19 @@ export async function setupQunit() {
     qunit.moduleDone(pause);
   }
 
+  // @ts-expect-error missing in types, does exist: https://api.qunitjs.com/callbacks/QUnit.on/#the-testend-event
+  QUnit.on('testEnd', (testEnd) => {
+    if (testEnd.status === 'failed') {
+      testEnd.errors.forEach((assertion: any) => {
+        console.error(assertion.stack);
+        // message: speedometer
+        // actual: 75
+        // expected: 88
+        // stack: at dmc.test.js:12
+      });
+    }
+  });
+
   qunit.done(({ failed }) => {
     if (failed > 0) {
       console.log('[HARNESS] fail');

packages/@glimmer/validator/index.ts

@@ -13,8 +13,9 @@ if (globalObj[GLIMMER_VALIDATOR_REGISTRATION] === true) {
 globalObj[GLIMMER_VALIDATOR_REGISTRATION] = true;
 
 export { debug } from './lib/debug';
-export { dirtyTagFor, tagFor, type TagMeta, tagMetaFor } from './lib/meta';
+export { dirtyTagFor, infoForTag, tagFor, type TagMeta, tagMetaFor } from './lib/meta';
 export { trackedData } from './lib/tracked-data';
+export * from './lib/tracked-utils';
 export {
   beginTrackFrame,
   beginUntrackFrame,

packages/@glimmer/validator/lib/meta.ts

@@ -1,4 +1,4 @@
-import type { ConstantTag, UpdatableTag } from '@glimmer/interfaces';
+import type { ConstantTag, Tag, UpdatableTag } from '@glimmer/interfaces';
 
 import type { Indexable } from './utils';
 
@@ -15,6 +15,7 @@ function isObjectLike<T>(u: T): u is Indexable & T {
 export type TagMeta = Map<PropertyKey, UpdatableTag>;
 
 const TRACKED_TAGS = new WeakMap<object, TagMeta>();
+const TAG_META = Symbol('TAG_META');
 
 export function dirtyTagFor<T extends object>(
   obj: T,
@@ -65,7 +66,16 @@ export function tagFor<T extends object>(
   if (tag === undefined) {
     tag = createUpdatableTag();
     tags.set(key, tag);
+
+    (tag as any)[TAG_META] = {
+      propertyKey: key,
+      object: obj,
+    };
   }
 
   return tag;
 }
+
+export function infoForTag(tag: Tag) {
+  return (tag as any)[TAG_META];
+}

packages/@glimmer/validator/lib/tracked-utils.ts

@@ -0,0 +1,78 @@
+import type { Tag } from '@glimmer/interfaces';
+
+import type { MonomorphicTagImpl } from './validators';
+
+import { infoForTag, tagFor } from './meta';
+import { track } from './tracking';
+import { validateTag, valueForTag } from './validators';
+
+type Info = {
+  tag: MonomorphicTagImpl;
+  prevValue: number;
+  dependencies: {
+    object: object;
+    propertyKey: string;
+    changed: boolean;
+  }[];
+};
+
+export function getTrackedDependencies(obj: Record<string, any>, property: string, info?: Info) {
+  info = info || ({} as Info);
+  const tag = info?.tag || track(() => obj[property]);
+  const dependencies = [];
+  // do not include tracked properties from dependencies
+
+  const subtags = (Array.isArray(tag.subtag) ? [tag, ...tag.subtag] : [tag, tag.subtag]).filter(
+    (t) => !!t
+  ) as Tag[];
+  for (const subtag of subtags) {
+    if (subtag === tag) continue;
+    dependencies.push({ ...infoForTag(subtag), tag: subtag });
+    if (subtag.subtag && !Array.isArray(subtag.subtag)) {
+      dependencies.push({ ...infoForTag(subtag.subtag) });
+    }
+  }
+
+  let maxRevision = valueForTag(tag);
+
+  const hasChange = (info.prevValue && maxRevision !== info.prevValue) || false;
+  let latestValue = info.prevValue || 0;
+
+  info.dependencies = dependencies.map((t) => {
+    if (t.tag.lastValue > latestValue) {
+      latestValue = t.tag.lastValue;
+    }
+    const changed = hasChange && t.tag.lastValue > info!.prevValue;
+    return { object: t.object, propertyKey: t.propertyKey, changed };
+  });
+
+  info.prevValue = maxRevision;
+
+  return info;
+}
+
+type TrackedInfo = {
+  changed: string[];
+  propertyInfo: Record<string, any>;
+};
+
+export function getChangedProperties(obj: object, trackedInfo?: TrackedInfo) {
+  trackedInfo = trackedInfo || ({} as TrackedInfo);
+  trackedInfo['changed'] = [];
+  trackedInfo.propertyInfo = trackedInfo.propertyInfo || {};
+  for (const name in obj) {
+    let tagInfo = trackedInfo.propertyInfo?.[name] || {
+      tag: tagFor(obj, name),
+      revision: (tagFor(obj, name) as MonomorphicTagImpl)['revision'],
+    };
+    if (!tagInfo.tag) return;
+    trackedInfo.propertyInfo[name] = tagInfo;
+
+    const changed = !validateTag(tagInfo.tag, tagInfo.revision);
+    tagInfo.revision = (tagInfo.tag as MonomorphicTagImpl)['revision'];
+    if (changed) {
+      trackedInfo['changed'].push(name);
+    }
+  }
+  return trackedInfo;
+}

packages/@glimmer/validator/lib/validators.ts

@@ -90,7 +90,7 @@ function allowsCycles(tag: Tag): boolean {
   }
 }
 
-class MonomorphicTagImpl<T extends MonomorphicTagId = MonomorphicTagId> {
+export class MonomorphicTagImpl<T extends MonomorphicTagId = MonomorphicTagId> {
   static combine(this: void, tags: Tag[]): Tag {
     switch (tags.length) {
       case 0:

packages/@glimmer/validator/test/meta-test.ts

@@ -1,4 +1,4 @@
-import { dirtyTagFor, tagFor, validateTag, valueForTag } from '@glimmer/validator';
+import { dirtyTagFor, infoForTag, tagFor, validateTag, valueForTag } from '@glimmer/validator';
 
 import { module, test } from './-utils';
 
@@ -18,4 +18,13 @@ module('@glimmer/validator: meta', () => {
 
     assert.notOk(validateTag(tag, snapshot));
   });
+
+  test('it can provide the object and property for the tag given object', (assert) => {
+    let obj = {};
+    let tag = tagFor(obj, 'foo');
+
+    let info = infoForTag(tag)!;
+    assert.strictEqual(info.object, obj);
+    assert.strictEqual(info.propertyKey, 'foo');
+  });
 });

packages/@glimmer/validator/test/tracked-utils-test.ts

@@ -0,0 +1,99 @@
+import { getChangedProperties, getTrackedDependencies, trackedData } from '@glimmer/validator';
+
+import { module, test } from './-utils';
+
+module('@glimmer/validator: tracked-utils', () => {
+  class TestObject {
+    declare item1: string;
+    declare item2: string;
+    item3 = '';
+    constructor() {}
+
+    get getterWithTracked() {
+      return this.item1 + ' world' + this.item2;
+    }
+  }
+
+  {
+    const { getter, setter } = trackedData<TestObject, 'item1'>('item1', () => '');
+    Object.defineProperty(TestObject.prototype, 'item1', {
+      enumerable: true,
+      get(this) {
+        return getter(this);
+      },
+      set(this, v) {
+        return setter(this, v);
+      },
+    });
+  }
+  {
+    const { getter, setter } = trackedData<TestObject, 'item2'>('item2', () => '');
+    Object.defineProperty(TestObject.prototype, 'item2', {
+      enumerable: true,
+      get(this) {
+        return getter(this);
+      },
+      set(this, v) {
+        return setter(this, v);
+      },
+    });
+  }
+
+  test('it can detect changed properties', (assert) => {
+    const obj = new TestObject();
+    let trackedInfo = getChangedProperties(obj);
+    assert.deepEqual(trackedInfo?.changed, []);
+
+    obj.item1 = 'hello';
+
+    assert.deepEqual(getChangedProperties(obj, trackedInfo)?.changed, ['item1']);
+    assert.deepEqual(getChangedProperties(obj, trackedInfo)?.changed, []);
+
+    obj.item1 = 'hi';
+    obj.item2 = 'hi';
+    assert.deepEqual(getChangedProperties(obj, trackedInfo)?.changed, ['item1', 'item2']);
+  });
+
+  test('it can detect tracked dependencies', (assert) => {
+    const obj = new TestObject();
+    let info = getTrackedDependencies(obj, 'getterWithTracked');
+    assert.deepEqual(info.dependencies, [
+      {
+        changed: false,
+        object: obj,
+        propertyKey: 'item1',
+      },
+      {
+        changed: false,
+        object: obj,
+        propertyKey: 'item2',
+      },
+    ]);
+
+    obj.item1 = 'hi';
+    assert.deepEqual(getTrackedDependencies(obj, 'getterWithTracked', info).dependencies, [
+      {
+        changed: true,
+        object: obj,
+        propertyKey: 'item1',
+      },
+      {
+        changed: false,
+        object: obj,
+        propertyKey: 'item2',
+      },
+    ]);
+    assert.deepEqual(getTrackedDependencies(obj, 'getterWithTracked', info).dependencies, [
+      {
+        changed: false,
+        object: obj,
+        propertyKey: 'item1',
+      },
+      {
+        changed: false,
+        object: obj,
+        propertyKey: 'item2',
+      },
+    ]);
+  });
+});