test: fix babel test transpilation

Author: Ninerian

.babelrc.js

@@ -1,25 +1,35 @@
 const sharedPresets = [];
-const shared = {
-
-}
+const shared = {};
 
 module.exports = {
   env: {
     esmUnbundled: shared,
     esmBundled: {
       ...shared,
-      presets: [['@babel/env', {
-        targets: "> 0.25%, not dead"
-      }], ...sharedPresets],
+      presets: [
+        [
+          '@babel/env',
+          {
+            targets: '> 0.25%, not dead'
+          }
+        ],
+        ...sharedPresets
+      ]
     },
     cjs: {
       ...shared,
-      presets: [['@babel/env', {
-        modules: 'commonjs'
-      }], ...sharedPresets],
+      presets: [
+        [
+          '@babel/env',
+          {
+            modules: 'commonjs'
+          }
+        ],
+        ...sharedPresets
+      ]
     },
     test: {
-      presets: ['@babel/env', ...sharedPresets]
-    },
+      presets: [['@babel/env', { targets: { node: 'current' } }], ...sharedPresets]
+    }
   }
-}
+};

jest.config.js

@@ -25,7 +25,6 @@ module.exports = {
 
   // The directory where Jest should output its coverage files
   coverageDirectory: 'coverage',
-
   // An array of regexp pattern strings used to skip coverage collection
   // coveragePathIgnorePatterns: [
   //   "/node_modules/"
@@ -124,7 +123,7 @@ module.exports = {
   // snapshotSerializers: [],
 
   // The test environment that will be used for testing
-  testEnvironment: 'jsdom'
+  testEnvironment: 'jsdom',
 
   // Options that will be passed to the testEnvironment
   // testEnvironmentOptions: {},
@@ -159,8 +158,9 @@ module.exports = {
   // timers: "real",
 
   // A map from regular expressions to paths to transformers
-  // transform: null,
-
+  transform: {
+    '\\.[jt]sx?$': 'babel-jest'
+  }
   // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
   // transformIgnorePatterns: [
   //   "/node_modules/"

package.json

@@ -17,8 +17,8 @@
     "prebuild": "yarn run lint",
     "prepare": "husky install",
     "dev": "rollup -c -w --config rollup.dev.js",
-    "test-unit": "jest",
-    "test-dev": "jest --watch",
+    "test-unit": "BABEL_ENV=test jest",
+    "test-dev": "BABEL_ENV=test jest --watch",
     "lint": "yarn run lint-code && yarn run lint-size",
     "lint-code": "yarn eslint src test",
     "lint-size": "yarn size-limit",