Webpack tests

[rauchg]

• Add test for a json require without using an extension (Require is unable to resolve JSON files without explicit ".json" extension #22)
• Add test using @google/datastore (https://github.com/zeit/now-builders/issues/52)
• Add test using firebase/app (this is how they recommend you import for prod in commonjs)

[timneutkens]

Shouldn't these builds fail? Or is it because at runtime they break

[rauchg]

They fail locally for me. Maybe CI wasn't set up correctly?

  ✕ should evaluate apollo.js without errors (5165ms)
  ✕ should evaluate auth0.js without errors (5022ms)
  ✓ should evaluate aws-sdk.js without errors (2969ms)
  ✓ should evaluate axios.js without errors (2285ms)
  ✓ should evaluate core-js.js without errors (1352ms)
  ✓ should evaluate cowsay.js without errors (49ms)
  ✓ should evaluate firebase.js without errors (310ms)
  ✕ should evaluate google-datastore.js without errors (5010ms)
  ✓ should evaluate ioredis.js without errors (1234ms)
  ✓ should evaluate jimp.js without errors (1180ms)
  ✓ should evaluate json-without-ext-sample.json without errors (19ms)
  ✓ should evaluate json-without-ext.js without errors (18ms)
  ✓ should evaluate koa.js without errors (569ms)
  ✓ should evaluate mailgun.js without errors (26ms)
  ✓ should evaluate mariadb.js without errors (524ms)
  ✓ should evaluate memcached.js without errors (83ms)
  ✓ should evaluate mongoose.js without errors (2314ms)
  ✓ should evaluate mysql.js without errors (798ms)
  ✓ should evaluate pdfkit.js without errors (1800ms)
  ✓ should evaluate pg.js without errors (352ms)
  ✓ should evaluate react.js without errors (95ms)
  ✓ should evaluate redis.js without errors (285ms)
  ✓ should evaluate request.js without errors (2237ms)
  ✓ should evaluate rxjs.js without errors (1564ms)
  ✓ should evaluate saslprep.js without errors (41ms)
  ✓ should evaluate sentry.js without errors (524ms)
  ✓ should evaluate stripe.js without errors (402ms)
  ✕ should evaluate twilio.js without errors (5008ms)