fix: support flow types_first

Author: jedwards1211

.babelrc.js

@@ -1,4 +1,4 @@
-module.exports = function(api) {
+module.exports = function (api) {
   const plugins = [
     '@babel/plugin-transform-flow-strip-types',
     '@babel/plugin-syntax-dynamic-import',

.circleci/config.yml

@@ -2,14 +2,10 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/node:12
+      - image: circleci/node:12.16
 
     steps:
       - checkout
-      - restore_cache:
-          name: Restore Yarn Package Cache
-          keys:
-            - v1-yarn-packages-{{ checksum "yarn.lock" }}
 
       - run:
           name: Setup NPM Token
@@ -26,18 +22,13 @@ jobs:
       - run:
           name: Install Dependencies
           command: yarn install --frozen-lockfile
-      - save_cache:
-          name: Save Yarn Package Cache
-          key: v1-yarn-packages-{{ checksum "yarn.lock" }}
-          paths:
-            - ~/.cache/yarn
 
       - run:
           name: build
           command: yarn run prepublishOnly
       - run:
           name: upload test coverage
-          command: yarn codecov || true
+          command: yarn codecov
       - run:
           name: release
-          command: yarn run semantic-release || true
+          command: yarn run semantic-release

.flowconfig

@@ -16,3 +16,5 @@
 module.system=node
 esproposal.class_static_fields=enable
 esproposal.class_instance_fields=enable
+well_formed_exports=true
+types_first=true