Move polyfills into separate module, and use it in JIT compilation

bin/ez-build.js

@@ -1,4 +1,3 @@
 #!/usr/bin/env node
-require('source-map-support/register')
-require('babel-polyfill')
+require('../lib/polyfill.js')
 require('../lib/main.js')

package.json

@@ -51,7 +51,7 @@
     "depcheck": "depcheck . --ignores-dirs=lib",
     "prepublish": "npm run depcheck && npm run build",
     "test": "npm run test:unit && npm run test:cli",
-    "test:unit": "tape -r babel-register -r babel-polyfill -r source-map-support/register test/unit/**/*.test.js",
+    "test:unit": "tape -r babel-register -r ./lib/polyfill test/unit/**/*.test.js",
     "test:cli": "bats test/cli/**/*.bats",
     "cov": "npm run build:cov && npm run cov:unit && npm run cov:cli",
     "cov:unit": "nyc npm run test:unit && nyc report && nyc report --reporter=text-lcov > unit.lcov",

src/polyfill.js

@@ -0,0 +1,2 @@
+import 'source-map-support/register'
+import 'babel-polyfill'