Make improvements to CI/CD pipeline

Make improvements to CI/CD pipeline:
- Run unit tests and build on several versions of Node.
- Break up tests into several parallel jobs.
- Use cross-platform rimraf for clean scripts.
- Separate clean scripts for main module and example.

Author: raymond-lam

.travis.yml

@@ -1,26 +1,46 @@
 language: node_js
-node_js:
-- node
-after_success:
-- coveralls < coverage/lcov.info
-- npm run-s build
-- test $TRAVIS_BRANCH = "main" && cd example && npm install &&
-  npm run build && cd ..
-deploy:
-- provider: pages
-  local_dir: example/build
-  skip_cleanup: true
-  github_token: "$GITHUB_TOKEN"
-  keep_history: true
-  on:
-    branch: main
-- provider: npm
-  skip_cleanup: true
-  email: [email protected]
-  api_key: "$NPM_TOKEN"
-  on:
-    tags: true
-    repo: ginkgobioworks/react-json-schema-form-builder
+node_js: node
+stages:
+  - test
+  - deploy
+jobs:
+  include:
+    - stage: test
+      script: npm run-s test:lint
+    - script: npm run-s test:flow
+
+    - script: npm run-s test:unit
+      after_success: coveralls < coverage/lcov.info
+    - node_js: 14
+      script: npm run-s test:unit
+    - node_js: 12
+      script: npm run-s test:unit
+
+    - script: npm run-s build
+    - node_js: 14
+      script: npm run-s build
+    - node_js: 12
+      script: npm run-s build
+
+    - stage: deploy
+      if: (repo = ginkgobioworks/react-json-schema-form-builder) AND (tag =~ ^v) AND NOT (type = pull_request)
+      before_deploy: npm run-s build
+      script: skip
+      deploy:
+        provider: npm
+        skip_cleanup: true
+        email: [email protected]
+        api_key: "$NPM_TOKEN"
+    - stage: deploy
+      if: (repo = ginkgobioworks/react-json-schema-form-builder) AND (branch = main) AND NOT (type = pull_request)
+      script: skip
+      before_deploy: npm run-s build && cd example && npm install && npm run build && cd .
+      deploy:
+        provider: pages
+        local_dir: example/build
+        skip_cleanup: true
+        github_token: "$GITHUB_TOKEN"
+        keep_history: true
 env:
   global:
   - secure: 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

example/package-lock.json

@@ -8,7 +8,8 @@
     "build": "node ../node_modules/react-scripts/bin/react-scripts.js build",
     "test": "node ../node_modules/react-scripts/bin/react-scripts.js test",
     "eject": "node ../node_modules/react-scripts/bin/react-scripts.js eject",
-    "flow": "flow"
+    "flow": "flow",
+    "clean": "rimraf node_modules build"
   },
   "dependencies": {
     "react": "file:../node_modules/react",
@@ -18,7 +19,8 @@
   },
   "devDependencies": {
     "@babel/plugin-syntax-object-rest-spread": "^7.8.3",
-    "flow-bin": "file:../node_modules/flow-bin"
+    "flow-bin": "file:../node_modules/flow-bin",
+    "rimraf": "^3.0.2"
   },
   "eslintConfig": {
     "extends": "react-app"

example/package.json

@@ -22,13 +22,13 @@
     "node": ">=12"
   },
   "scripts": {
-    "clean": "rm package-lock.json && rm -r -f node_modules && rm -r -f dist && rm -r -f coverage && cd example && rm package-lock.json && rm -r -f node_modules && rm -r -f build",
+    "clean": "rimraf node_modules coverage dist",
     "build": "microbundle-crl --no-compress --format modern,cjs",
     "start": "microbundle-crl watch --no-compress --format modern,cjs",
     "flow": "flow",
     "flow:install-types": "flow-typed install",
     "test": "run-s test:unit test:lint test:flow",
-    "test:flow": "flow && cd example && npm install && flow",
+    "test:flow": "flow",
     "test:lint": "eslint .",
     "test:unit": "cross-env CI=1 react-scripts test --env=jsdom --coverage --coverageDirectory=coverage/",
     "test:watch": "react-scripts test --env=jsdom",
@@ -78,7 +78,8 @@
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-json-editor-ajrm": "^2.5.13",
-    "react-scripts": "^3.4.1"
+    "react-scripts": "^3.4.1",
+    "rimraf": "^3.0.2"
   },
   "dependencies": {
     "classnames": "^2.2.6",