fix cached

packages/model/addon/-private/record-state.ts

@@ -1,8 +1,9 @@
 import { assert } from '@ember/debug';
 import { dependentKeyCompat } from '@ember/object/compat';
-import { cached, tracked } from '@glimmer/tracking';
+import { tracked } from '@glimmer/tracking';
 
 import notifyChanges from './notify-changes';
+import cached from './tmp-cached-polyfill';
 
 type RecordData = import('@ember-data/record-data/-private').RecordData;
 type RequestCache = import('@ember-data/store/-private/system/request-cache').default;

packages/model/addon/-private/tmp-cached-polyfill.js

@@ -0,0 +1,42 @@
+import { assert } from '@ember/debug';
+import { createCache, getValue } from '@glimmer/tracking/primitives/cache';
+
+/**
+ * Implements the @cached decorator from Ember. Ported from ember-cached-decorator-polyfill
+ *
+ * This can be removed once the polyfill works with ember 3.27+
+ * See: https://github.com/ember-polyfills/ember-cached-decorator-polyfill/issues/70
+ */
+export default function cached(...args) {
+  const [target, key, descriptor] = args; // Error on `@cached()`, `@cached(...args)`, and `@cached propName = value;`
+
+  true &&
+    !(target !== undefined) &&
+    assert(
+      'You attempted to use @cached(), which is not necessary nor supported. Remove the parentheses and you will be good to go!',
+      target !== undefined
+    );
+  true &&
+    !(typeof target === 'object' && typeof key === 'string' && typeof descriptor === 'object' && args.length === 3) &&
+    assert(
+      `You attempted to use @cached on with ${args.length > 1 ? 'arguments' : 'an argument'} ( @cached(${args
+        .map((d) => `'${d}'`)
+        .join(
+          ', '
+        )}), which is not supported. Dependencies are automatically tracked, so you can just use ${'`@cached`'}`,
+      typeof target === 'object' && typeof key === 'string' && typeof descriptor === 'object' && args.length === 3
+    );
+  true &&
+    !(typeof descriptor.get === 'function') &&
+    assert(
+      `The @cached decorator must be applied to getters. '${key}' is not a getter.`,
+      typeof descriptor.get === 'function'
+    );
+  const caches = new WeakMap();
+  const getter = descriptor.get;
+
+  descriptor.get = function () {
+    if (!caches.has(this)) caches.set(this, createCache(getter.bind(this)));
+    return getValue(caches.get(this));
+  };
+}

packages/model/package.json

@@ -27,7 +27,7 @@
     "ember-cli-string-utils": "^1.1.0",
     "ember-cli-test-info": "^1.0.0",
     "ember-cli-typescript": "^4.1.0",
-    "ember-cached-decorator-polyfill": "^0.1.1",
+    "ember-cache-primitive-polyfill": "^1.0.1",
     "ember-compatibility-helpers": "^1.2.0",
     "inflection": "1.12.0"
   },