convert analytics to TS

packages/analytics/src/models/pagination.ts

@@ -0,0 +1,89 @@
+/* eslint-disable lines-between-class-members */
+/* eslint-disable class-methods-use-this */
+// eslint-disable-next-line max-classes-per-file
+import mongoose, { Types } from 'mongoose'
+
+export const DESC: string = 'desc'
+export const ASC: string = 'asc'
+
+interface Order {
+  getOperator(): string
+  getOrder(): number
+  getName(): string
+}
+
+class Asc implements Order {
+  getOperator(): string {
+    return '$gt'
+  }
+
+  getOrder(): number {
+    return 1
+  }
+
+  getName(): string {
+    return ASC
+  }
+}
+
+class Desc implements Order {
+  getOperator(): string {
+    return '$lt'
+  }
+
+  getOrder(): 1 | -1 {
+    return -1
+  }
+
+  getName(): string {
+    return DESC
+  }
+}
+
+export default class Pagination {
+  nextKey: Types.ObjectId | null = null
+  itemsPerPage: number = 50
+  order: Order
+
+  constructor(
+    order: string,
+    itemsPerPage: number = 50,
+    nextKey: string | null = null
+  ) {
+    this.itemsPerPage = itemsPerPage
+    if (!order || order === DESC) {
+      this.order = new Desc()
+    } else if (order === ASC) {
+      this.order = new Asc()
+    } else {
+      throw new Error('order must be asc or desc')
+    }
+    if (nextKey) {
+      this.nextKey = new mongoose.Types.ObjectId(nextKey)
+    }
+  }
+
+  match(field: string) {
+    const stage: { [key: string]: { [key: string]: Types.ObjectId } } = this
+      .nextKey
+      ? {
+          [field]: {
+            [this.order ? this.order.getOperator() : '$gt']: this.nextKey,
+          },
+        }
+      : {}
+    return { $match: stage }
+  }
+
+  sort(field: string): { $sort: Record<string, 1 | -1> } {
+    return { $sort: { [field]: this.order.getOrder() as 1 | -1 } }
+  }
+
+  limit() {
+    return { $limit: this.itemsPerPage }
+  }
+
+  getOrder() {
+    return this.order.getName()
+  }
+}