build: remove plugins that already exist on preset-env (#48)

simplify babel

.babelrc

@@ -5,13 +5,18 @@
     }
   },
   "ignore": ["node_modules/**/*"],
-  "plugins": [
-    "@babel/plugin-syntax-dynamic-import",
-    "@babel/plugin-transform-flow-strip-types",
-    "@babel/plugin-transform-property-mutators",
-    "@babel/plugin-proposal-object-rest-spread",
-    "@babel/plugin-proposal-class-properties",
-    "@babel/plugin-transform-classes"
-  ],
-  "presets": ["@babel/preset-env", "@babel/preset-flow"]
+  "plugins": ["@babel/plugin-transform-flow-strip-types", "@babel/plugin-proposal-class-properties"],
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "loose": true,
+        "bugfixes": true,
+        "targets": {
+          "browsers": ["chrome >= 47", "firefox >= 51", "ie >= 11", "safari >= 8", "ios >= 8", "android >= 4"]
+        }
+      }
+    ],
+    "@babel/preset-flow"
+  ]
 }

package.json

@@ -55,11 +55,7 @@
     "@babel/cli": "^7.10.5",
     "@babel/core": "^7.10.5",
     "@babel/plugin-proposal-class-properties": "^7.10.4",
-    "@babel/plugin-proposal-object-rest-spread": "^7.10.4",
-    "@babel/plugin-syntax-dynamic-import": "^7.8.3",
-    "@babel/plugin-transform-classes": "^7.10.4",
     "@babel/plugin-transform-flow-strip-types": "^7.10.4",
-    "@babel/plugin-transform-property-mutators": "^7.10.4",
     "@babel/preset-env": "^7.10.4",
     "@babel/preset-flow": "^7.10.4",
     "@babel/register": "^7.10.5",

yarn.lock

@@ -376,7 +376,7 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.10.4"
 
-"@babel/plugin-syntax-dynamic-import@^7.8.0", "@babel/plugin-syntax-dynamic-import@^7.8.3":
+"@babel/plugin-syntax-dynamic-import@^7.8.0":
   version "7.8.3"
   resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-dynamic-import/-/plugin-syntax-dynamic-import-7.8.3.tgz#62bf98b2da3cd21d626154fc96ee5b3cb68eacb3"
   integrity sha512-5gdGbFon+PszYzqs83S3E5mpi7/y/8M9eC90MRTZfduQOYW76ig6SOSPNe41IG5LoP3FGBn2N0RjVDSQiS94kQ==
@@ -631,14 +631,6 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.10.4"
 
-"@babel/plugin-transform-property-mutators@^7.10.4":
-  version "7.10.4"
-  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-property-mutators/-/plugin-transform-property-mutators-7.10.4.tgz#ee8555609d717b7f73e5b9cd161adf003a0f40ea"
-  integrity sha512-9+qPYEpJvBjpcZDLffYybBTl7nZmk0sK0wkwsZQK6rvgGHnxpk9mAvFGV3h11/1UeJe1uXwXdY0HsstnCBZGGw==
-  dependencies:
-    "@babel/helper-define-map" "^7.10.4"
-    "@babel/helper-plugin-utils" "^7.10.4"
-
 "@babel/plugin-transform-regenerator@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-regenerator/-/plugin-transform-regenerator-7.10.4.tgz#2015e59d839074e76838de2159db421966fd8b63"