Setup Typescipt and make Collection Array-like

.gitignore

@@ -19,3 +19,4 @@
 # IDE
 /.idea/
 /*.iml
+types/assert*

babel.config.js

@@ -8,5 +8,10 @@ module.exports = {
         },
       },
     ],
+    ["@babel/typescript"],
+  ],
+  plugins: [
+    "@babel/plugin-proposal-class-properties",
+    "@babel/proposal-object-rest-spread",
   ],
 };

jest.config.js

@@ -4,8 +4,8 @@ let internal = {
   testEnvironment: "jsdom",
   testMatch: ["**/__tests__/internal/**/*-test.[jt]s?(x)"],
   moduleNameMapper: {
-    "@lib(.*)": "<rootDir>/lib$1",
-    "^miragejs$": "<rootDir>/lib/index",
+    "@lib(.*)": "<rootDir>/dist$1",
+    "^miragejs$": "<rootDir>/dist/index",
   },
 };
 

lib/assert.ts

@@ -0,0 +1,20 @@
+export default function assert(bool: boolean, text: string = "") {
+  if (typeof bool === "string" && !text) {
+    throw new MirageError(bool);
+  }
+
+  if (!bool) {
+    throw new MirageError(text.replace(/^ +/gm, "") || "Assertion failed");
+  }
+}
+
+export class MirageError extends Error {
+  constructor(message: string, stack?: string) {
+    super();
+    if (stack) {
+      this.stack = `Mirage: ${stack}`;
+    }
+    this.name = "MirageError";
+    this.message = `Mirage: ${message}`;
+  }
+}

lib/factory.js

@@ -3,6 +3,9 @@ import isFunction from "lodash.isfunction";
 import mapValues from "lodash.mapvalues";
 import referenceSort from "./utils/reference-sort";
 
+/**
+ * @type {Class}
+ */
 let Factory = function () {
   this.build = function (sequence) {
     let object = {};