Remove legacy emojify function (#38965)

app/javascript/mastodon/utils/objects.ts

@@ -0,0 +1,52 @@
+import { isPlainObject } from '@reduxjs/toolkit';
+
+export type RecordObject = Record<PropertyKey, unknown>;
+
+export function isRecordObject(obj: unknown): obj is RecordObject {
+  return isPlainObject(obj);
+}
+
+type NestedProperty<T, K extends readonly PropertyKey[]> = K extends readonly [
+  infer Head,
+  ...infer Tail,
+]
+  ? Head extends keyof NonNullable<T>
+    ? Tail extends readonly PropertyKey[]
+      ? NestedProperty<NonNullable<T>[Head], Tail>
+      : NonNullable<T>[Head]
+    : undefined
+  : T;
+
+export function getNestedProperty<
+  TObject extends RecordObject,
+  const TKeys extends readonly PropertyKey[],
+>(object: TObject, ...keys: TKeys): NestedProperty<TObject, TKeys> | undefined;
+export function getNestedProperty(
+  object: unknown,
+  ...keys: PropertyKey[]
+): unknown;
+export function getNestedProperty(
+  object: unknown,
+  ...keys: PropertyKey[]
+): unknown {
+  if (!isRecordObject(object) || keys.length === 0) {
+    return undefined;
+  }
+
+  const remainingKeys = [...keys];
+  let currentObject: RecordObject = object;
+  while (remainingKeys.length > 0) {
+    const currentKey = remainingKeys.shift();
+    if (currentKey !== undefined && currentKey in currentObject) {
+      const nextObject = currentObject[currentKey];
+      if (isRecordObject(nextObject)) {
+        currentObject = nextObject;
+        continue;
+      } else if (remainingKeys.length === 0) {
+        return nextObject;
+      }
+    }
+  }
+
+  return undefined;
+}