introduce @babel/plugin-proposal-class-properties to support class member property

Author: EthanLin-TWer

babel.config.js

@@ -1,11 +1,10 @@
 module.exports = {
-  presets: [
+  presets: [['@babel/preset-env', { targets: { node: 'current' } }]],
+  plugins: [
     [
-      '@babel/preset-env',
+      '@babel/plugin-proposal-class-properties',
       {
-        targets: {
-          node: 'current',
-        },
+        loose: true,
       },
     ],
   ],

package.json

@@ -12,6 +12,7 @@
   },
   "devDependencies": {
     "@babel/core": "^7.7.5",
+    "@babel/plugin-proposal-class-properties": "^7.7.4",
     "@babel/preset-env": "^7.7.6",
     "babel-jest": "^24.9.0",
     "jest": "^24.9.0",

yarn.lock

@@ -57,6 +57,18 @@
     "@babel/traverse" "^7.7.4"
     "@babel/types" "^7.7.4"
 
+"@babel/helper-create-class-features-plugin@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-7.7.4.tgz#fce60939fd50618610942320a8d951b3b639da2d"
+  integrity sha512-l+OnKACG4uiDHQ/aJT8dwpR+LhCJALxL0mJ6nzjB25e5IPwqV1VOsY7ah6UB1DG+VOXAIMtuC54rFJGiHkxjgA==
+  dependencies:
+    "@babel/helper-function-name" "^7.7.4"
+    "@babel/helper-member-expression-to-functions" "^7.7.4"
+    "@babel/helper-optimise-call-expression" "^7.7.4"
+    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/helper-replace-supers" "^7.7.4"
+    "@babel/helper-split-export-declaration" "^7.7.4"
+
 "@babel/helper-create-regexp-features-plugin@^7.7.4":
   version "7.7.4"
   resolved "https://registry.npm.taobao.org/@babel/helper-create-regexp-features-plugin/download/@babel/helper-create-regexp-features-plugin-7.7.4.tgz?cache=0&sync_timestamp=1574466720467&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fhelper-create-regexp-features-plugin%2Fdownload%2F%40babel%2Fhelper-create-regexp-features-plugin-7.7.4.tgz#6d5762359fd34f4da1500e4cff9955b5299aaf59"
@@ -207,6 +219,14 @@
     "@babel/helper-remap-async-to-generator" "^7.7.4"
     "@babel/plugin-syntax-async-generators" "^7.7.4"
 
+"@babel/plugin-proposal-class-properties@^7.7.4":
+  version "7.7.4"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-class-properties/-/plugin-proposal-class-properties-7.7.4.tgz#2f964f0cb18b948450362742e33e15211e77c2ba"
+  integrity sha512-EcuXeV4Hv1X3+Q1TsuOmyyxeTRiSqurGJ26+I/FW1WbymmRRapVORm6x1Zl3iDIHyRxEs+VXWp6qnlcfcJSbbw==
+  dependencies:
+    "@babel/helper-create-class-features-plugin" "^7.7.4"
+    "@babel/helper-plugin-utils" "^7.0.0"
+
 "@babel/plugin-proposal-dynamic-import@^7.7.4":
   version "7.7.4"
   resolved "https://registry.npm.taobao.org/@babel/plugin-proposal-dynamic-import/download/@babel/plugin-proposal-dynamic-import-7.7.4.tgz#dde64a7f127691758cbfed6cf70de0fa5879d52d"