Feature/es6

.babelrc

@@ -0,0 +1,10 @@
+{
+    "presets": [
+        "es2015"
+    ],
+    "plugins": [
+        "transform-async-to-generator",
+        "source-map-support"
+    ],
+    "sourceMaps": "inline"
+}

.eslintignore

@@ -0,0 +1,2 @@
+dist
+benchmark

.eslintrc.js → .eslintrc

@@ -1,13 +1,21 @@
-module.exports = {
+{
     "env": {
         "es6": true,
         "node": true
     },
     "extends": "eslint:recommended",
     "parserOptions": {
-        "sourceType": "module"
+        "sourceType": "module",
+        "ecmaVersion": 2017
     },
     "rules": {
+        "prefer-destructuring": ["error", {
+            "array": true,
+            "object": true
+            }, {
+            "enforceForRenamedProperties": false
+            }
+        ],
         "indent": [
             "error",
             4
@@ -33,4 +41,4 @@ module.exports = {
             "as-needed"
         ]
     }
-};
+}

.travis.yml

@@ -6,7 +6,12 @@ os:
   - linux
   - osx
 osx_image: xcode8
-script: 'npm test'
-cache:
-  directories:
-    - node_modules
+install:
+  - npm install
+  - npm run lint
+  - npm run build
+script:
+  - npm run test-build
+# cache:
+#   directories:
+#     - node_modules

Dockerfile

@@ -0,0 +1,12 @@
+FROM node:4-alpine
+RUN apk --no-cache add perl
+
+ADD package.json /app/package.json
+RUN cd /app && npm install
+
+ADD . /app
+WORKDIR /app
+RUN npm install
+
+# ENV NODE_ENV production
+CMD ["npm", "run", "build"]

README.md

@@ -718,6 +718,17 @@ context.globalExiftoolConstructor = exiftool.ExiftoolProcess
 Otherwise, the context will use a stable version which it installs
 independently.
 
+## Building
+
+The project is written with ES2017 (`async/await`) and built to be compatible
+with lower Node.js versions using `Babel`. `npm run build` will build source
+and test files. `npm run test-build` will run transpiled tests against
+transpiled sources, whereas `npm t` will run raw tests against raw source files.
+
+The preset used for transpiling is `es2015`, but without
+`transform-es2015-classes`, and with `transform-async-to-generator` and
+`source-map-support`.
+
 ## Metadata
 
 Metadata is awesome and although it can increase the file size, it preserves

appveyor.yml

@@ -8,14 +8,17 @@ install:
   - ps: Install-Product node $env:nodejs_version
   # install modules
   - npm install
+  - npm run lint
+  # transpile
+  - npm run build
 
 # Post-install test scripts.
 test_script:
   # Output useful info for debugging.
   - node --version
   - npm --version
   # run tests
-  - npm test
+  - npm run test-build
 
 # Don't actually build.
 build: off