(refactor): get tsdx test working with babel-jest, JS/JSX

- TSDX changes some of Jest's defaults and so causes some issues for
  JS/JSX support
  - by default Jest supports JS and JSX in testMatch and babel-jest is
    automatically run on JS/JSX files if a babelrc is found

- also had to configure class-properties for Babel as while it's
  automatically included with tsdx build, no Babel transforms are
  included with tsdx test (yet)

(deps): remove jest as it's a dep of TSDX
(deps): remove babel-jest@23 since we can use @24 now
- which is a dep of jest@24
- remove require.resolve from it as it causes errors due to not being
  a direct dependency

Author: agilgur5

.babelrc.js

@@ -2,5 +2,8 @@ module.exports = {
   presets: [
     ['@babel/preset-env'], // needed at least until https://github.com/jaredpalmer/tsdx/pull/473 is released
     ['@babel/preset-react']
+  ],
+  plugins: [
+    ['@babel/plugin-proposal-class-properties'] // required for tsdx test, related to https://github.com/jaredpalmer/tsdx/issues/383#issuecomment-581637869
   ]
 }

jest.config.js

@@ -8,9 +8,11 @@ module.exports = {
     'window-resizeto/polyfill'
   ],
   transform: {
-    // use babel-jest@23 for babel@6 support (https://github.com/facebook/jest/issues/8230#issuecomment-479470547)
-    '\\.js$': require.resolve('babel-jest')
+    // support babel-jest. TSDX defaults to just ts-jest. see https://github.com/jaredpalmer/tsdx/pull/486
+    '\\.js$': 'babel-jest'
   },
+  // support JS + JSX. TSDX defaults to just TS + TSX. see https://github.com/jaredpalmer/tsdx/pull/486
+  testMatch: ['**/?(*.)+(spec|test).[jt]s?(x)'],
   coveragePathIgnorePatterns: [
     '/node_modules/', // default
     '<rootDir>/test/' // ignore any test helper files

package-lock.json

@@ -44,7 +44,7 @@
     "lint:fix": "tsdx lint '**/*.js' --fix",
     "start": "webpack-dev-server -d --inline --hot",
     "build": "tsdx build",
-    "test": "jest",
+    "test": "tsdx test",
     "test:pub": "npm run build && npm pack",
     "pub": "npm run build && npm publish",
     "changelog": "changelog-maker"
@@ -64,7 +64,6 @@
     "@wojtekmaj/enzyme-adapter-react-17": "^0.6.6",
     "babel-core": "^6.26.3",
     "babel-eslint": "^10.0.2",
-    "babel-jest": "^23.6.0",
     "babel-loader": "^6.0.0",
     "babel-preset-es2015": "^6.14.0",
     "babel-preset-react": "^6.11.1",
@@ -79,7 +78,6 @@
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-react": "^7.18.3",
     "eslint-plugin-standard": "^4.0.1",
-    "jest": "^24.8.0",
     "jest-environment-jsdom-fifteen": "^1.0.2",
     "jest-without-globals": "^0.0.2",
     "react": "^17.0.2",