Use yarn workspaces.

.gitignore

@@ -7,7 +7,6 @@ node_modules/
 .idea
 packages/site/build
 package-lock.json
-yarn.lock
 .DS_Store
 .cache
 public/

.travis.yml

@@ -3,14 +3,13 @@ language: node_js
 node_js:
   - "8"
 
-cache:
-  directories:
-    - node_modules
-
 script: npm run test
 
 before_install:
-  - npm install codecov
+  - curl -o- -L https://yarnpkg.com/install.sh | bash
+  - export PATH="$HOME/.yarn/bin:$PATH"
+
+install: yarn install --frozen-lockfile
 
 before_script:
   - npm run bootstrap
@@ -19,13 +18,6 @@ after_success:
   - cat ./coverage/lcov.info | ./node_modules/codecov/bin/codecov
 
 cache:
+  yarn: true
   directories:
     - node_modules
-    - packages/site/node_modules
-    - packages/react-emotion/node_modules
-    - packages/preact-emotion/node_modules
-    - packages/babel-plugin-emotion/node_modules
-    - packages/emotion-utils/node_modules
-    - packages/benchmarks/node_modules
-    - packages/emotion-server/node_modules
-    - packages/emotion/node_modules

.yarnrc

@@ -0,0 +1 @@
+workspaces-experimental true

CONTRIBUTING.md

@@ -1,22 +1,24 @@
 ## Prerequisites
 
-[Node.js](http://nodejs.org/) >= v7 must be installed.
+- [Node.js](http://nodejs.org/) >= v7 must be installed.
+
+- [Yarn](https://yarnpkg.com/en/docs/install)
 
 ## Installation
 
-- Running `npm install` in the module's root directory will install everything you need for development.
+- Running `yarn` in the module's root directory will install everything you need for development.
 - Run `lerna bootstrap` in the module's root directory
 
 ## Running Tests
 
-- `npm test` will run the tests once.
+- `yarn test` will run the tests once.
 
-- `npm run test:coverage` will run the tests and produce a coverage report in `coverage/`.
+- `yarn test:coverage` will run the tests and produce a coverage report in `coverage/`.
 
-- `npm run test:watch` will run the tests on every change.
+- `yarn test:watch` will run the tests on every change.
 
 ## Building
 
-- `npm run build` will build the module for publishing to npm.
+- `yarn build` will build the module for publishing to npm.
 
-- `npm run clean` will delete built resources.
+- `yarn clean` will delete built resources.

lerna.json

@@ -1,8 +1,5 @@
 {
   "lerna": "2.2.0",
-  "packages": [
-    "packages/*"
-  ],
   "changelog": {
     "repo": "emotion-js/emotion",
     "labels": {
@@ -13,5 +10,7 @@
       "Tag: Internal": ":house: Internal"
     }
   },
-  "version": "8.0.8"
+  "version": "8.0.8",
+  "npmClient": "yarn",
+  "useWorkspaces": true
 }

netlify.toml

@@ -0,0 +1,3 @@
+[build]
+  command = "rm -rf /opt/buildhome/.yarn && curl -o- -L https://yarnpkg.com/install.sh | bash && export PATH=\"$HOME/.yarn/bin:$PATH\" && yarn && npm run bootstrap && npm run build && npm run build:site"
+  publish = "packages/site/build"

package.json

@@ -36,6 +36,7 @@
     "babel-preset-react": "^6.24.1",
     "babel-preset-stage-0": "^6.24.1",
     "bundlesize": "^0.13.2",
+    "codecov": "^2.3.1",
     "css": "^2.2.1",
     "cssjanus": "^1.2.0",
     "enzyme": "^2.9.1",
@@ -145,6 +146,9 @@
       "<rootDir>/packages/emotion-utils/src/stylis.js"
     ]
   },
+  "workspaces": [
+    "packages/*"
+  ],
   "bugs": {
     "url": "https://github.com/tkh44/emotion/issues"
   },