Firestore (4.6.1) 2017-11-08T15:29:45.406Z: INTERNAL UNHANDLED ERROR:  TypeError: protobufjs.newBuilder is not a function
    at loadProtos (/user_code/node_modules/firebase/node_modules/@firebase/firestore/dist/cjs/src/platform_node/load_protos.js:37:30)
    at /user_code/node_modules/firebase/node_modules/@firebase/firestore/dist/cjs/src/platform_node/load_protos.js:23:9
    at /user_code/node_modules/firebase/node_modules/@firebase/firestore/dist/cjs/src/util/node_api.js:58:9
    at Object.nodePromise (/user_code/node_modules/firebase/node_modules/@firebase/firestore/dist/cjs/src/util/node_api.js:57:12)
    at Object.loadProtosAsync (/user_code/node_modules/firebase/node_modules/@firebase/firestore/dist/cjs/src/platform_node/load_protos.js:22:23)
    at NodePlatform.loadConnection (/user_code/node_modules/firebase/node_modules/@firebase/firestore/dist/cjs/src/platform_node/node_platform.js:28:30)
    at FirestoreClient.initializeRest (/user_code/node_modules/firebase/node_modules/@firebase/firestore/dist/cjs/src/core/firestore_client.js:218:14)
    at /user_code/node_modules/firebase/node_modules/@firebase/firestore/dist/cjs/src/core/firestore_client.js:109:54
    at process._tickDomainCallback (internal/process/next_tick.js:135:7)