setup ava for ts, port test/ to ts

test/index.ts

@@ -5,7 +5,7 @@ import path from 'path';
 import test from 'ava';
 import {Application} from 'spectron';
 
-let app;
+let app: Application;
 
 test.before(async () => {
   let pathToBinary;
@@ -40,5 +40,5 @@ test.after(async () => {
 
 test('see if dev tools are open', async t => {
   await app.client.waitUntilWindowLoaded();
-  t.false(await app.browserWindow.isDevToolsOpened());
+  t.false(await app.webContents.isDevToolsOpened());
 });

test/testUtils/is-hex-color.ts

@@ -1,5 +1,5 @@
-function isHexColor(color) {
+function isHexColor(color: string) {
   return /(^#[0-9A-F]{6,8}$)|(^#[0-9A-F]{3}$)/i.test(color); // https://regex101.com/
 }
 
-module.exports.isHexColor = isHexColor;
+export {isHexColor};

test/unit/cli-api.test.ts

@@ -2,10 +2,10 @@ import test from 'ava';
 const proxyquire = require('proxyquire').noCallThru();
 
 test('existsOnNpm() builds the url for non-scoped packages', t => {
-  let getUrl;
+  let getUrl: string;
   const {existsOnNpm} = proxyquire('../../cli/api', {
     got: {
-      get(url) {
+      get(url: string) {
         getUrl = url;
         return Promise.resolve({
           body: {
@@ -23,10 +23,10 @@ test('existsOnNpm() builds the url for non-scoped packages', t => {
 });
 
 test('existsOnNpm() builds the url for scoped packages', t => {
-  let getUrl;
+  let getUrl: string;
   const {existsOnNpm} = proxyquire('../../cli/api', {
     got: {
-      get(url) {
+      get(url: string) {
         getUrl = url;
         return Promise.resolve({
           body: {