Failing test for broken d.ts file

Ref #1

package.json

@@ -7,7 +7,7 @@
   "scripts": {
     "prepublishOnly": "npm run lint && npm test && npm run build",
     "pretest": "rimraf coverage .nyc_output",
-    "test": "nyc --reporter=text --reporter=html mocha --opts mocha.opts",
+    "test": "tsc && nyc --reporter=text --reporter=html mocha --opts mocha.opts",
     "lint": "eslint src test",
     "coveralls": "nyc report --reporter=text-lcov | coveralls",
     "prebuild": "rimraf lib",
@@ -42,13 +42,15 @@
     "@babel/plugin-proposal-object-rest-spread": "^7.3.2",
     "@babel/preset-env": "^7.3.1",
     "@babel/register": "^7.0.0",
+    "@types/node": "^11.9.5",
     "coveralls": "^3.0.3",
     "eslint": "^5.14.1",
     "mocha": "^6.0.1",
     "nyc": "^13.3.0",
     "redux": "^4.0.1",
     "reselect": "^4.0.0",
     "rimraf": "^2.6.3",
-    "sinon": "^7.2.4"
+    "sinon": "^7.2.4",
+    "typescript": "^3.3.3333"
   }
 }

test/fixtures/redux.js

@@ -30,11 +30,11 @@ export const getWidgets = createSelector(state => state.widgets, widgets => widg
 export default (state = defaultState, action) => {
   switch (action.type) {
     case ADD_ITEM:
-      return {...state, items: state.items.concat({id: action.id, name: action.name})}
+      return {...state, items: [...state.items, {id: action.id, name: action.name}]}
     case REMOVE_ITEM:
       return {...state, items: state.items.filter(i => i.id !== action.id)}
     case ADD_WIDGET:
-      return {...state, widgets: state.widgets.concat({id: action.id, name: action.name})}
+      return {...state, widgets: [...state.widgets, {id: action.id, name: action.name}]}
     case REMOVE_WIDGET:
       return {...state, widgets: state.widgets.filter(i => i.id !== action.id)}
     default:

test/test.ts

@@ -0,0 +1,65 @@
+
+import {ok} from 'assert'
+import {createSelector} from 'reselect'
+import { createStore, Store } from 'redux';
+import subscribe from '../lib/index'
+
+type Item = {id: Number, name: String}
+type Widget = {widget_id: Number, widget_name: String}
+
+const ADD_ITEM = 'ADD_ITEM'
+type ADD_ITEM = typeof ADD_ITEM
+type addItemAction = {type: ADD_ITEM, id: Number, name: String}
+const addItem = (name: String): addItemAction => ({type: ADD_ITEM, id: item_id++, name})
+
+const REMOVE_ITEM = 'REMOVE_ITEM'
+type REMOVE_ITEM = typeof REMOVE_ITEM
+type removeItemAction = {type: REMOVE_ITEM, id: Number}
+const removeItem = (id: Number): removeItemAction => ({type: REMOVE_ITEM, id})
+
+type StoreActions = addItemAction | removeItemAction
+
+type StoreState = {
+  items: Item[],
+}
+
+let item_id = 0
+
+const defaultState = {
+  items: []
+}
+
+const reducer = (state: StoreState = defaultState, action: StoreActions) => {
+  switch (action.type) {
+    case ADD_ITEM:
+      return {...state, items: [...state.items, {id: action.id, name: action.name}]}
+    case REMOVE_ITEM:
+      return {...state, items: state.items.filter(i => i.id !== action.id)}
+    default:
+      return state
+  }
+}
+
+
+const store: Store<StoreState, StoreActions> = createStore(reducer)
+
+const getItems = createSelector((state: StoreState) => state.items, items => items)
+
+const hasItem = createSelector(getItems, items => items.length > 0)
+
+const firstItemId = createSelector(getItems, items => items[0].id)
+
+const transformToWidget = createSelector(getItems, items => items.map(item => ({widget_id: item.id, widget_name: item.name})))
+
+subscribe(store, getItems, (res: Item[]) => ok(res))
+
+subscribe(store, hasItem, (res: boolean) => ok(res))
+
+subscribe(store, firstItemId, (res: Number) => ok(res))
+
+subscribe(store, transformToWidget, (res: Widget[]) => ok(res))
+
+store.dispatch(addItem('item #1'))
+store.dispatch(addItem('item #2'))
+store.dispatch(removeItem(0))
+

tsconfig.json

@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "noEmit": true,
+    "locale": "en-ca",
+    "target": "es6",
+    "declaration": false,
+    "strictNullChecks": true,
+    "noImplicitUseStrict": false,
+    "allowUnreachableCode": false,
+    "noUnusedLocals": true,
+    "noImplicitAny": true,
+    "noImplicitReturns": true,
+    "module": "commonjs",
+    "lib": [
+      "es2015",
+      "es2017",
+      "dom"
+    ]
+  },
+  "files": ["test/test.ts"],
+  "exclude": [
+    "node_modules",
+    "dist"
+  ]
+}