Add more 6to5 specs

spec/6to5-spec.coffee

@@ -1,26 +1,41 @@
-{create6to5VersionAndOptionsDigest} = require '../src/6to5'
+to5 = require '../src/6to5'
 crypto = require 'crypto'
 
-describe "::create6to5VersionAndOptionsDigest", ->
-  it "returns a digest for the library version and specified options", ->
-    defaultOptions =
-      blacklist: [
-        'useStrict'
-      ]
-      experimental: true
-      optional: [
-        'asyncToGenerator'
-      ]
-      reactCompat: true
-      sourceMap: 'inline'
-    version = '3.0.14'
-    shasum = crypto.createHash('sha1')
-    shasum.update('6to5-core', 'utf8')
-    shasum.update('\0', 'utf8')
-    shasum.update(version, 'utf8')
-    shasum.update('\0', 'utf8')
-    shasum.update('{"blacklist": ["useStrict",],"experimental": true,"optional": ["asyncToGenerator",],"reactCompat": true,"sourceMap": "inline",}')
-    expectedDigest = shasum.digest('hex')
+describe "6to5 transpiler support", ->
+  describe "::create6to5VersionAndOptionsDigest", ->
+    it "returns a digest for the library version and specified options", ->
+      defaultOptions =
+        blacklist: [
+          'useStrict'
+        ]
+        experimental: true
+        optional: [
+          'asyncToGenerator'
+        ]
+        reactCompat: true
+        sourceMap: 'inline'
+      version = '3.0.14'
+      shasum = crypto.createHash('sha1')
+      shasum.update('6to5-core', 'utf8')
+      shasum.update('\0', 'utf8')
+      shasum.update(version, 'utf8')
+      shasum.update('\0', 'utf8')
+      shasum.update('{"blacklist": ["useStrict",],"experimental": true,"optional": ["asyncToGenerator",],"reactCompat": true,"sourceMap": "inline",}')
+      expectedDigest = shasum.digest('hex')
 
-    observedDigest = create6to5VersionAndOptionsDigest(version, defaultOptions)
-    expect(observedDigest).toEqual expectedDigest
+      observedDigest = to5.create6to5VersionAndOptionsDigest(version, defaultOptions)
+      expect(observedDigest).toEqual expectedDigest
+
+  describe "when a .js file starts with 'use 6to5';", ->
+    it "transpiles it using 6to5", ->
+      transpiled = require('./fixtures/6to5/single-quotes.js')
+      expect(transpiled(3)).toBe 4
+
+  describe 'when a .js file starts with "use 6to5";', ->
+    it "transpiles it using 6to5", ->
+      transpiled = require('./fixtures/6to5/double-quotes.js')
+      expect(transpiled(3)).toBe 4
+
+  describe "when a .js file does not start with 'use 6to6';", ->
+    it "does not transpile it using 6to5", ->
+      expect(-> require('./fixtures/6to5/invalid.js')).toThrow()

spec/fixtures/6to5/double-quotes.js

@@ -0,0 +1,3 @@
+"use 6to5";
+
+module.exports = v => v + 1

spec/fixtures/6to5/invalid.js

@@ -0,0 +1,3 @@
+'use 6to6';
+
+module.exports = v => v + 1

spec/fixtures/6to5/single-quotes.js

@@ -0,0 +1,3 @@
+'use 6to5';
+
+module.exports = v => v + 1

src/6to5.coffee

@@ -90,10 +90,7 @@ create6to5VersionAndOptionsDigest = (version, options) ->
   shasum.digest('hex')
 
 cacheDir = path.join(fs.absolute('~/.atom'), 'compile-cache')
-jsCacheDir = path.join(
-    cacheDir,
-    create6to5VersionAndOptionsDigest(to5.version, defaultOptions),
-    'js')
+jsCacheDir = path.join(cacheDir, create6to5VersionAndOptionsDigest(to5.version, defaultOptions), 'js')
 
 getCachePath = (sourceCode) ->
   digest = crypto.createHash('sha1').update(sourceCode, 'utf8').digest('hex')