Revert "Removed weird file"

This reverts commit 2ceb5db2bd.

ghost/in-memory-repository/src/InMemoryRepository.ts~

@@ -0,0 +1,80 @@
+import nql from '@tryghost/nql';
+
+type Entity<T> = {
+    id: T;
+    deleted: boolean;
+}
+
+type Order<T> = {
+    field: keyof T;
+    direction: 'asc' | 'desc';
+}
+
+type OrderOption<T extends Entity<any>> = Order<T>[];
+
+export abstract class InMemoryRepository<IDType, T extends Entity<IDType>> {
+    private store: T[] = [];
+    private ids: Map<IDType, true> = new Map();
+
+    constructor() {}
+
+    protected abstract toPrimitive(entity: T): object;
+
+    public async save(entity: T): Promise<void> {
+        if (entity.deleted) {
+            this.store = this.store.filter(item => item.id !== entity.id);
+            this.ids.delete(entity.id);
+            return;
+        }
+
+        if (this.ids.has(entity.id)) {
+            this.store = this.store.map((item) => {
+                if (item.id === entity.id) {
+                    return entity;
+                }
+                return item;
+            });
+        } else {
+            this.store.push(entity);
+            this.ids.set(entity.id, true);
+        }
+    }
+
+    public async getById(id: string): Promise<T | null> {
+        return this.store.find(item => item.id === id) || null;
+    }
+
+    public async getAll(options: { filter?: string; order?: OrderOption<T> } = {}): Promise<T[]> {
+        const filter = nql(options.filter);
+
+        const results = this.store.slice().filter(item => filter.queryJSON(this.toPrimitive(item)));
+
+        if (options.order) {
+            for (const order of options.order) {
+                results.sort((a, b) => {
+                    if (order.direction === 'asc') {
+                        return a[order.field] as any > (b[order.field] as any) ? 1 : -1;
+                    } else {
+                        return a[order.field] < b[order.field] ? 1 : -1;
+                    }
+                });
+            }
+        }
+
+        return results;
+    }
+
+    public async getPage(options: { filter?: string; page: number; limit: number; order?: Order<T>[] } = {page: 1, limit: 15}): Promise<T[]> {
+        const results = await this.getAll(options);
+
+        const start = (options.page - 1) * options.limit;
+        const end = start + options.limit;
+
+        return results.slice(start, end);
+    }
+
+    public async getCount(options: { filter?: string }): Promise<number> {
+        const results = await this.getAll(options);
+        return results.length;
+    }
+}