Merge pull request #39 from alfg/typescriptify

upgrade: initial pass at converting project into typescript.

Author: alfg

.browserslistrc

@@ -1,2 +1,3 @@
 > 1%
 last 2 versions
+not dead

.eslintrc.js

@@ -1,27 +1,23 @@
 module.exports = {
   root: true,
-
   env: {
     node: true,
   },
-
   extends: [
     'plugin:vue/essential',
     '@vue/airbnb',
+    '@vue/typescript/recommended',
   ],
-
   rules: {
     'no-console': process.env.NODE_ENV === 'production' ? 'off' : 'off',
     'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
     'vue/multi-word-component-names': 'off',
     'vue/no-mutating-props': 'off',
     'vuejs-accessibility/media-has-caption': 'off',
   },
-
   parserOptions: {
-    parser: '@babel/eslint-parser',
+    ecmaVersion: 2020,
   },
-
   overrides: [
     {
       files: [

.travis.yml

@@ -1,3 +1,3 @@
 module.exports = {
-  preset: '@vue/cli-plugin-unit-jest',
+  preset: '@vue/cli-plugin-unit-jest/presets/typescript-and-babel',
 };