revert(api): decouple api from curriculum

This reverts commit c077ffe4b9
via PR #40703

api-server/server/utils/in-memory-cache.js

@@ -0,0 +1,43 @@
+function isPromiseLike(thing) {
+  return !!thing && typeof thing.then === 'function';
+}
+
+function InMemoryCache(initialValue, reportError) {
+  if (typeof reportError !== 'function') {
+    throw new Error(
+      'No reportError function specified for this in-memory-cache'
+    );
+  }
+  const cacheKey = Symbol('cacheKey');
+  const cache = new Map();
+  cache.set(cacheKey, initialValue);
+
+  return {
+    get() {
+      const value = cache.get(cacheKey);
+      return typeof value !== 'undefined' ? value : null;
+    },
+
+    update(fn) {
+      try {
+        const value = fn();
+        if (isPromiseLike(value)) {
+          return value.then(value => cache.set(cacheKey, value));
+        } else {
+          cache.set(cacheKey, value);
+        }
+      } catch (e) {
+        const errMsg = `InMemoryCache > update > caught: ${e.message}`;
+        e.message = errMsg;
+        reportError(e);
+      }
+      return null;
+    },
+
+    clear() {
+      return cache.delete(cacheKey);
+    }
+  };
+}
+
+export default InMemoryCache;