chore(danger): report PR's build size

.travis.yml

@@ -14,22 +14,22 @@ cache:
 env:
   matrix:
   - NODE_VER=4 FULL_VALIDATE=false
-  - NODE_VER=6 FULL_VALIDATE=true alias grunt=./node_modules/grunt-cli/bin/grunt danger=./node_modules/danger/distribution/danger
+  - NODE_VER=6 FULL_VALIDATE=true alias grunt=./node_modules/grunt-cli/bin/grunt
   - NODE_VER=7 FULL_VALIDATE=false
 matrix:
   fast_finish: true
 
 before_install:
   - nvm install $NODE_VER
-  - npm install -g npm@4 && node -v && npm -v
+  - npm install -g npm@4 && npm install -g npx && node -v && npm -v
   - if [ "$FULL_VALIDATE" == "true" ]; then npm install grunt@0.4.1 grunt-cli grunt-contrib-connect grunt-run; fi
-  - if [ "$FULL_VALIDATE" == "true" ] && [ -n "DANGER_GITHUB_API_TOKEN" ]; then npm install danger@0.18.0 && danger; fi
 
 install:
   - npm install
   - if [ "$FULL_VALIDATE" == "true" ]; then npm run lint && npm run check_circular_dependencies; fi
 
 script:
+  - if [ "$FULL_VALIDATE" == "true" ] && [ -n "DANGER_GITHUB_API_TOKEN" ]; then echo {} > ./.babelrc && npx danger; fi
   - npm run build_spec && npm run test_mocha && node ./node_modules/markdown-doctest/bin/cmd.js
 
 after_success:

dangerfile.js

@@ -1,6 +1,8 @@
 var fs = require('fs');
 var path = require('path');
 var _ = require('lodash');
+var getSize = require('get-folder-size');
+var gzipSize = require('gzip-size');
 var validateMessage = require('validate-commit-msg');
 
 //simple regex matcher to detect usage of helper function and its type signature
@@ -65,4 +67,59 @@ var messageConventionValid = danger.git.commits.reduce(function (acc, value) {
 if (!messageConventionValid) {
   warn('commit message does not follows conventional change log (' + ++errorCount + ')');
   markdown('> (' + errorCount + ') : RxJS uses conventional change log to generate changelog automatically. It seems some of commit messages are not following those, please check [contributing guideline](https://github.com/ReactiveX/rxjs/blob/master/CONTRIBUTING.md#commit-message-format) and update commit messages.');
-}
+}
+
+function getKB(size) {
+  return (size / 1024).toFixed(2);
+}
+
+var globalFile = 'Rx.js';
+var minFile = 'Rx.min.js';
+
+function sizeDiffBadge(name, value) {
+  return 'https://img.shields.io/badge/' + name + '-' + value + 'KB-red.svg?style=flat-square';
+}
+
+//post size of build
+schedule(new Promise(function (res) {
+  getSize('./dist/cjs', function (e, result) {
+    var localGlobalFile = path.resolve('./dist/global', globalFile);
+    var localMinFile = path.resolve('./dist/global', minFile);
+
+    //get sizes of PR build
+    var global = fs.statSync(localGlobalFile);
+    var global_gzip = gzipSize.sync(fs.readFileSync(localGlobalFile, 'utf8'));
+    var min = fs.statSync(localMinFile);
+    var min_gzip = gzipSize.sync(fs.readFileSync(localMinFile, 'utf8'));
+
+    //resolve path to release build
+    var releasePath = path.dirname(require.resolve(require.resolve('rxjs')));
+    var bundlePath = path.resolve(releasePath, 'bundles');
+    var bundleGlobalFile = path.resolve(bundlePath, globalFile);
+    var bundleMinFile = path.resolve(bundlePath, minFile);
+
+    var packagePath = path.resolve(releasePath, 'package.json');
+    var releaseVersion = require(packagePath).version;
+
+    //get sizes of release build
+    var bundleGlobal = fs.statSync(bundleGlobalFile);
+    var bundle_global_gzip = gzipSize.sync(fs.readFileSync(bundleGlobalFile, 'utf8'));
+    var bundleMin = fs.statSync(bundleMinFile);
+    var bundle_min_gzip = gzipSize.sync(fs.readFileSync(bundleMinFile, 'utf8'));
+
+    var sizeMessage = '<img src="https://img.shields.io/badge/Size%20Diff%20%28' + releaseVersion + '%29--lightgrey.svg?style=flat-square"/> ';
+    sizeMessage += '<img src="' + sizeDiffBadge('Global', getKB(global.size) - getKB(bundleGlobal.size)) + '"/>';
+    sizeMessage += '<img src="' + sizeDiffBadge('Global(gzipped)', getKB(global_gzip) - getKB(bundle_global_gzip)) + '"/>';
+    sizeMessage += '<img src="' + sizeDiffBadge('Min', getKB(min.size) - getKB(bundleMin.size)) + '"/>';
+    sizeMessage += '<img src="' + sizeDiffBadge('Min (gzipped)', getKB(min_gzip) - getKB(bundle_min_gzip)) + '"/>';
+    message(sizeMessage);
+
+    markdown('> CJS: **' + getKB(result) +
+      '**KB, global: **' + getKB(global.size) +
+      '**KB (gzipped: **' + getKB(global_gzip) +
+      '**KB), min: **' + getKB(min.size) +
+      '**KB (gzipped: **' + getKB(min_gzip) + '**KB)');
+
+    res();
+  });
+}));

package.json

@@ -155,11 +155,13 @@
     "commitizen": "^2.8.6",
     "coveralls": "^2.11.13",
     "cz-conventional-changelog": "^1.2.0",
+    "danger": "^0.21.0",
     "doctoc": "^1.0.0",
     "escape-string-regexp": "^1.0.5 ",
     "esdoc": "^0.4.7",
     "eslint": "^3.8.0",
     "fs-extra": "^2.1.2",
+    "get-folder-size": "^1.0.0",
     "glob": "^7.0.3",
     "gm": "^1.22.0",
     "google-closure-compiler-js": "^20170218.0.0",
@@ -185,6 +187,7 @@
     "rollup-plugin-inject": "^2.0.0",
     "rollup-plugin-node-resolve": "^2.0.0",
     "rx": "latest",
+    "rxjs": "latest",
     "shx": "^0.2.2",
     "sinon": "^2.1.0",
     "sinon-chai": "^2.9.0",