Test node againts tfjs-core@master on Travis Nightly (every 24h) (#170)

Travis nightly will clone and link the latest unpublished tfjs-core before running any of the regular stuff (build, lint, test).

If a nightly fails, Travis will email us (assuming you have correct email settings). Nightly runs every 24 hours.

Towards tensorflow/tfjs#848

(Analogous change in layers: tensorflow/tfjs-layers#353)

DEV

.travis.yml

@@ -3,9 +3,15 @@ os:
   - osx
 language: node_js
 node_js: "8"
-
 script:
-  - yarn
-  - yarn build
-  - yarn lint
-  - yarn test
+  - ./scripts/test-travis.sh
+cache: yarn
+git:
+  depth: 5
+notifications:
+  email:
+    recipients:
+      - tensorflowjs-build@google.com
+    on_success: never
+    on_failure: always
+    on_pull_requests: false

scripts/test-travis.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+# Copyright 2018 Google LLC
+#
+# Use of this source code is governed by an MIT-style
+# license that can be found in the LICENSE file or at
+# https://opensource.org/licenses/MIT.
+# =============================================================================
+
+set -e
+
+# If this is nightly, use tfjs-core at master.
+if [ "$TRAVIS_EVENT_TYPE" = cron ]
+then
+  echo '########### Testing against tfjs-core@master ###########'
+  yarn run rimraf tfjs-core/
+  # depth is an optimization for faster clone (don't clone all of history).
+  git clone https://github.com/tensorflow/tfjs-core.git --depth=5
+  cd tfjs-core
+  yarn && yarn build && yarn publish-local
+  cd ..
+  yarn link-local '@tensorflow/tfjs-core'
+fi
+
+# Regular testing.
+yarn build
+yarn lint
+yarn test