chore: Use named capture groups polyfill on Node.js < v10

.circleci/config.yml

@@ -41,11 +41,17 @@ jobs:
           key: v1-dependencies-{{ checksum "package.json" }}
 
       - run: 
-          name: Run tests and coverage
+          name: Run Node.js v10 tests and coverage
           command: |
             set -e
             npm run test-coverage
 
+      - run: 
+          name: Run Node.js v8 tests
+          command: |
+            nvm use 8
+            npm run test
+
       - run:
           name: Send coverage to Code Climate
           command: ./cc-test-reporter after-build --coverage-input-type lcov --exit-code $?

package.json

@@ -36,7 +36,8 @@
     "cross-spawn": "^6.0.4",
     "debug": "^4.1.1",
     "lodash": "^4.17.11",
-    "normalize-path": "^3.0.0"
+    "normalize-path": "^3.0.0",
+    "regexp-polyfill": "^1.0.1"
   },
   "optionalDependencies": {},
   "devDependencies": {

src/regexp.js

@@ -1,11 +1,22 @@
-const LINE_SPLIT = /\n|\r\n|\x08+|\r +\r/
-const BODY_PROGRESS = /^ *(?<percent>\d+)% ?(?<fileCount>\d+)? ?(?<file>.*)$/
-const BODY_SYMBOL_FILE = /^(?<symbol>[=TU+R.-]) (?<file>.+)$/
-const BODY_HASH = /^(?<hash>\S+)? +(?<size>\d*) +(?<file>.+)$/
-const END_OF_STAGE_HYPHEN = /^(-+ +)+-+$/
-const INFOS = /^(?<property>.+?)(?<separator>( = )|(: +))(?<value>.+)$/
-const INFOS_SPLIT = /, +# /
-const ERROR = /(?<level>WARNING|ERROR): (?<message>.*)(\r\n)?(\n)?/i
+// @COMPAT Named capture groups aren't available before Node.js 10. This
+// compatibility checks the running Node.js version and apply a polyfill
+// if needed.
+// Support until Jan 2020 (https://github.com/nodejs/Release)
+const semver = /v(\d+)\.(\d+)\.(\d+)/
+const nodeVersionResults = process.version.match(semver)
+const nodeVersionMajor = parseInt(nodeVersionResults[1])
+if (nodeVersionMajor < 10) {
+  require('regexp-polyfill')
+}
+
+const LINE_SPLIT = new RegExp('\n|\r\n|\x08+|\r +\r')
+const BODY_PROGRESS = new RegExp('^ *(?<percent>\\d+)% ?(?<fileCount>\\d+)? ?(?<file>.*)$')
+const BODY_SYMBOL_FILE = new RegExp('^(?<symbol>[=TU+R.-]) (?<file>.+)$')
+const BODY_HASH = new RegExp('^(?<hash>\\S+)? +(?<size>\\d*) +(?<file>.+)$')
+const END_OF_STAGE_HYPHEN = new RegExp('^(-+ +)+-+$')
+const INFOS = new RegExp('^(?<property>.+?)(?<separator>( = )|(: +))(?<value>.+)$')
+const INFOS_SPLIT = new RegExp(', +# ')
+const ERROR = new RegExp('(?<level>WARNING|ERROR): (?<message>.*)(\r\n)?(\n)?', 'i')
 
 module.exports = {
   LINE_SPLIT,