🐛 report code coverage

package.json

@@ -9,7 +9,7 @@
     "pretest": "npm run-script build",
     "test": "npm run-script test-node && npm run-script test-browser",
     "pretest-node": "babel --source-maps true --source-root ./index.js ./test/ -d ./test-transpiled/",
-    "test-node": "VCR_MODE=cache istanbul cover _mocha -- --reporter spec ./test-transpiled/**/node**.js",
+    "test-node": "VCR_MODE=cache istanbul cover --report json _mocha -- --reporter spec ./test-transpiled/**/node**.js",
     "pretest-browser": "webpack --config ./webpack.config-browsertests.js",
     "test-browser": "./script/run-test-browser.sh",
     "test-browser:only": "mocha-phantomjs --reporter spec --timeout 20000 http://localhost:9876/test/index.html",
@@ -43,6 +43,7 @@
     "eslint-config-standard": "^6.2.0",
     "eslint-plugin-promise": "^3.4.0",
     "eslint-plugin-standard": "^2.0.1",
+    "glob": "^7.1.1",
     "grunt": "~1.0.1",
     "grunt-bump": "~0.8.0",
     "http-server": "^0.9.0",

script/coverage-helper.js

@@ -0,0 +1,17 @@
+var fs = require('fs')
+var glob = require('glob')
+
+glob('./dist/node/**/*.map', removeSourcesContent)
+glob('./test-transpiled/**/*.map', removeSourcesContent)
+
+function removeSourcesContent(err, files) {
+  if (files.length === 0) {
+    console.error('Could not find any sourcemap files to tweak for remap-istanbul')
+    process.exit(1)
+  }
+  files.forEach(function(file) {
+    var contents = JSON.parse(fs.readFileSync(file))
+    delete contents.sourcesContent
+    fs.writeFileSync(file, JSON.stringify(contents))
+  })
+}

script/send-coverage.sh

@@ -1,13 +1,20 @@
 #!/bin/bash
 
+# Istanbul does not preserve sourcemaps when generating code coverage so
+# this uses remap-istanbul. But remap-istanbul likes to use the sourcesContent
+# field in the sourcemap files which causes them to not point to the correct
+# source. So coverage-helper.js removes that field in all sourcemap files.
+
 nodeVer=$(node --version)
 semver=( ${nodeVer//./ } )
 
 if [[ "${semver[0]}" == "v6" ]]; then
 
   echo "==> Reporting coverage to codecov"
-  $(npm bin)/remap-istanbul --exclude 'index.js' --input ./coverage/coverage.json --output ./coverage/coverage-mapped-to-source.json --type json
-  $(npm bin)/codecov --file ./coverage/coverage-mapped-to-source.json
+  rm ./coverage/coverage.json # Just in case so codecov does not find it
+  node ./script/coverage-helper.js
+  $(npm bin)/remap-istanbul --exclude 'index.js' --input ./coverage/coverage-final.json --output ./coverage/coverage-mapped-to-source.json --type json
+  $(npm bin)/codecov --file=./coverage/coverage-mapped-to-source.json
 
 else
   echo "==> Skipping coverage reporting because remap-istanbul only works on node v6+"