[FEAT] Updates @tracked to match the Tracked Properties RFC

packages/@ember/-internals/metal/index.ts

@@ -29,12 +29,12 @@ export {
   PROPERTY_DID_CHANGE,
 } from './lib/property_events';
 export { defineProperty } from './lib/properties';
+export { nativeDescDecorator } from './lib/decorator';
 export {
   descriptorForProperty,
   isComputedDecorator,
   setComputedDecorator,
-  nativeDescDecorator,
-} from './lib/decorator';
+} from './lib/descriptor_map';
 export { watchKey, unwatchKey } from './lib/watch_key';
 export { ChainNode, finishChains, removeChainWatcher } from './lib/chains';
 export { watchPath, unwatchPath } from './lib/watch_path';
@@ -49,7 +49,7 @@ export { Mixin, aliasMethod, mixin, observer, applyMixin } from './lib/mixin';
 export { default as inject, DEBUG_INJECTION_FUNCTIONS } from './lib/injected_property';
 export { setHasViews, tagForProperty, tagFor, markObjectAsDirty } from './lib/tags';
 export { default as runInTransaction, didRender, assertNotRendered } from './lib/transaction';
-export { tracked } from './lib/tracked';
+export { tracked, getCurrentTracker, setCurrentTracker } from './lib/tracked';
 
 export {
   NAMESPACES,

packages/@ember/-internals/metal/lib/alias.ts

@@ -7,10 +7,10 @@ import {
   addDependentKeys,
   ComputedDescriptor,
   Decorator,
-  descriptorForDecorator,
   makeComputedDecorator,
   removeDependentKeys,
 } from './decorator';
+import { descriptorForDecorator } from './descriptor_map';
 import { defineProperty } from './properties';
 import { get } from './property_get';
 import { set } from './property_set';

packages/@ember/-internals/metal/lib/chains.ts

@@ -1,6 +1,6 @@
 import { Meta, meta as metaFor, peekMeta } from '@ember/-internals/meta';
 import { getCachedValueFor } from './computed_cache';
-import { descriptorForProperty } from './decorator';
+import { descriptorForProperty } from './descriptor_map';
 import { eachProxyFor } from './each_proxy';
 import { get } from './property_get';
 import { unwatchKey, watchKey } from './watch_key';

packages/@ember/-internals/metal/lib/computed.ts

@@ -14,10 +14,10 @@ import {
   addDependentKeys,
   ComputedDescriptor,
   Decorator,
-  descriptorForDecorator,
   makeComputedDecorator,
   removeDependentKeys,
 } from './decorator';
+import { descriptorForDecorator } from './descriptor_map';
 import expandProperties from './expand_properties';
 import { defineProperty } from './properties';
 import { notifyPropertyChange } from './property_events';

packages/@ember/-internals/metal/lib/decorator.ts

@@ -1,11 +1,10 @@
-import { Meta, meta as metaFor, peekMeta } from '@ember/-internals/meta';
+import { Meta, meta as metaFor } from '@ember/-internals/meta';
 import { EMBER_NATIVE_DECORATOR_SUPPORT } from '@ember/canary-features';
 import { assert } from '@ember/debug';
 import { DEBUG } from '@glimmer/env';
+import { setComputedDecorator } from './descriptor_map';
 import { unwatch, watch } from './watching';
 
-const DECORATOR_DESCRIPTOR_MAP: WeakMap<Decorator, ComputedDescriptor | boolean> = new WeakMap();
-
 // https://tc39.github.io/proposal-decorators/#sec-elementdescriptor-specification-type
 export interface ElementDescriptor {
   descriptor: PropertyDescriptor & { initializer?: any };
@@ -21,61 +20,6 @@ export type Decorator = (
   isClassicDecorator?: boolean
 ) => ElementDescriptor;
 
-// ..........................................................
-// DESCRIPTOR
-//
-
-/**
-  Returns the CP descriptor assocaited with `obj` and `keyName`, if any.
-
-  @method descriptorFor
-  @param {Object} obj the object to check
-  @param {String} keyName the key to check
-  @return {Descriptor}
-  @private
-*/
-export function descriptorForProperty(obj: object, keyName: string, _meta?: Meta | null) {
-  assert('Cannot call `descriptorFor` on null', obj !== null);
-  assert('Cannot call `descriptorFor` on undefined', obj !== undefined);
-  assert(
-    `Cannot call \`descriptorFor\` on ${typeof obj}`,
-    typeof obj === 'object' || typeof obj === 'function'
-  );
-
-  let meta = _meta === undefined ? peekMeta(obj) : _meta;
-
-  if (meta !== null) {
-    return meta.peekDescriptors(keyName);
-  }
-}
-
-export function descriptorForDecorator(dec: Decorator) {
-  return DECORATOR_DESCRIPTOR_MAP.get(dec);
-}
-
-/**
-  Check whether a value is a decorator
-
-  @method isComputedDecorator
-  @param {any} possibleDesc the value to check
-  @return {boolean}
-  @private
-*/
-export function isComputedDecorator(dec: Decorator | null | undefined) {
-  return dec !== null && dec !== undefined && DECORATOR_DESCRIPTOR_MAP.has(dec);
-}
-
-/**
-  Set a value as a decorator
-
-  @method setComputedDecorator
-  @param {function} decorator the value to mark as a decorator
-  @private
-*/
-export function setComputedDecorator(dec: Decorator) {
-  DECORATOR_DESCRIPTOR_MAP.set(dec, true);
-}
-
 // ..........................................................
 // DEPENDENT KEYS
 //
@@ -188,7 +132,7 @@ export function makeComputedDecorator(
 
     assert(
       'Native decorators are not enabled without the EMBER_NATIVE_DECORATOR_SUPPORT flag',
-      EMBER_NATIVE_DECORATOR_SUPPORT ? !isClassicDecorator : isClassicDecorator
+      EMBER_NATIVE_DECORATOR_SUPPORT || isClassicDecorator
     );
 
     elementDesc.kind = 'method';
@@ -208,7 +152,7 @@ export function makeComputedDecorator(
     return elementDesc;
   };
 
-  DECORATOR_DESCRIPTOR_MAP.set(decorator, desc);
+  setComputedDecorator(decorator, desc);
 
   Object.setPrototypeOf(decorator, DecoratorClass.prototype);
 

packages/@ember/-internals/metal/lib/descriptor_map.ts

@@ -0,0 +1,58 @@
+import { Meta, peekMeta } from '@ember/-internals/meta';
+import { assert } from '@ember/debug';
+
+const DECORATOR_DESCRIPTOR_MAP: WeakMap<
+  import('./decorator').Decorator,
+  import('./decorator').ComputedDescriptor | boolean
+> = new WeakMap();
+
+/**
+  Returns the CP descriptor assocaited with `obj` and `keyName`, if any.
+
+  @method descriptorFor
+  @param {Object} obj the object to check
+  @param {String} keyName the key to check
+  @return {Descriptor}
+  @private
+*/
+export function descriptorForProperty(obj: object, keyName: string, _meta?: Meta | null) {
+  assert('Cannot call `descriptorFor` on null', obj !== null);
+  assert('Cannot call `descriptorFor` on undefined', obj !== undefined);
+  assert(
+    `Cannot call \`descriptorFor\` on ${typeof obj}`,
+    typeof obj === 'object' || typeof obj === 'function'
+  );
+
+  let meta = _meta === undefined ? peekMeta(obj) : _meta;
+
+  if (meta !== null) {
+    return meta.peekDescriptors(keyName);
+  }
+}
+
+export function descriptorForDecorator(dec: import('./decorator').Decorator) {
+  return DECORATOR_DESCRIPTOR_MAP.get(dec);
+}
+
+/**
+  Check whether a value is a decorator
+
+  @method isComputedDecorator
+  @param {any} possibleDesc the value to check
+  @return {boolean}
+  @private
+*/
+export function isComputedDecorator(dec: import('./decorator').Decorator | null | undefined) {
+  return dec !== null && dec !== undefined && DECORATOR_DESCRIPTOR_MAP.has(dec);
+}
+
+/**
+  Set a value as a decorator
+
+  @method setComputedDecorator
+  @param {function} decorator the value to mark as a decorator
+  @private
+*/
+export function setComputedDecorator(dec: import('./decorator').Decorator, value: any = true) {
+  DECORATOR_DESCRIPTOR_MAP.set(dec, value);
+}

packages/@ember/-internals/metal/lib/mixin.ts

@@ -22,12 +22,12 @@ import {
   ComputedPropertyGetter,
   ComputedPropertySetter,
 } from './computed';
+import { makeComputedDecorator } from './decorator';
 import {
   descriptorForDecorator,
   descriptorForProperty,
   isComputedDecorator,
-  makeComputedDecorator,
-} from './decorator';
+} from './descriptor_map';
 import { addListener, removeListener } from './events';
 import expandProperties from './expand_properties';
 import { classToString, setUnprocessedMixins } from './namespace_search';

packages/@ember/-internals/metal/lib/properties.ts

@@ -3,15 +3,10 @@
 */
 
 import { Meta, meta as metaFor, peekMeta, UNDEFINED } from '@ember/-internals/meta';
-import { EMBER_NATIVE_DECORATOR_SUPPORT } from '@ember/canary-features';
 import { assert } from '@ember/debug';
 import { DEBUG } from '@glimmer/env';
-import {
-  Decorator,
-  descriptorForProperty,
-  ElementDescriptor,
-  isComputedDecorator,
-} from './decorator';
+import { Decorator, ElementDescriptor } from './decorator';
+import { descriptorForProperty, isComputedDecorator } from './descriptor_map';
 import { overrideChains } from './property_events';
 
 export type MandatorySetterFunction = ((this: object, value: any) => void) & {
@@ -155,16 +150,19 @@ export function defineProperty(
 
   let value;
   if (isComputedDecorator(desc)) {
-    let elementDesc: ElementDescriptor = {
+    let elementDesc = {
       key: keyName,
       kind: 'field',
       placement: 'own',
       descriptor: {
         value: undefined,
       },
-    };
+      toString() {
+        return '[object Descriptor]';
+      },
+    } as ElementDescriptor;
 
-    if (DEBUG && !EMBER_NATIVE_DECORATOR_SUPPORT) {
+    if (DEBUG) {
       elementDesc = desc!(elementDesc, true);
     } else {
       elementDesc = desc!(elementDesc);

packages/@ember/-internals/metal/lib/property_events.ts

@@ -2,7 +2,7 @@ import { Meta, peekMeta } from '@ember/-internals/meta';
 import { symbol } from '@ember/-internals/utils';
 import { DEBUG } from '@glimmer/env';
 import changeEvent from './change_event';
-import { descriptorForProperty } from './decorator';
+import { descriptorForProperty } from './descriptor_map';
 import { sendEvent } from './events';
 import ObserverSet from './observer_set';
 import { markObjectAsDirty } from './tags';

packages/@ember/-internals/metal/lib/property_get.ts

@@ -5,7 +5,7 @@ import { HAS_NATIVE_PROXY, symbol } from '@ember/-internals/utils';
 import { EMBER_METAL_TRACKED_PROPERTIES } from '@ember/canary-features';
 import { assert } from '@ember/debug';
 import { DEBUG } from '@glimmer/env';
-import { descriptorForProperty } from './decorator';
+import { descriptorForProperty } from './descriptor_map';
 import { isPath } from './path_cache';
 import { tagForProperty } from './tags';
 import { getCurrentTracker } from './tracked';

packages/@ember/-internals/metal/lib/property_set.ts

@@ -3,7 +3,7 @@ import { HAS_NATIVE_PROXY, lookupDescriptor, toString } from '@ember/-internals/
 import { assert } from '@ember/debug';
 import EmberError from '@ember/error';
 import { DEBUG } from '@glimmer/env';
-import { descriptorForProperty } from './decorator';
+import { descriptorForProperty } from './descriptor_map';
 import { isPath } from './path_cache';
 import { MandatorySetterFunction } from './properties';
 import { notifyPropertyChange } from './property_events';