Added support for NPM.

Published the codlab-elements on NPM

.gitignore

@@ -3,4 +3,5 @@ bazel-*
 .drone.sec.yml
 .idea/
 debug.test
-*pb.go
+*pb.go
+node_modules

BUILD.bazel

@@ -17,3 +17,15 @@ genrule(
     ],
     cmd = "zip -j $@ $(SRCS)",
 )
+
+genrule(
+    name = "npm_dist",
+    outs = ["npm_dist.zip"],
+    srcs = [
+        "LICENSE",
+        "package.json",
+        "//codelab-elements:README.md",
+        "//codelab-elements:all_files",
+    ],
+    cmd = "zip -j $@ $(SRCS)",
+)

codelab-elements/README.md

@@ -155,6 +155,26 @@ Here's an index.html obtaining the codelab-elements from Google Cloud Storage:
 </html>
 ```
 
+## NPM
+
+The library is published on NPM.js at: https://www.npmjs.com/package/codelab-elements
+
+We also support a build workflow using NPM. To build the library run fro the root of the repo:
+
+```bash
+# Install dependencies. This takes care of installing the right version of Bazel.
+npm install
+
+# Build the library
+npm run build
+
+# The output is a zip file under bazel-genfiles
+ls bazel-genfiles npm_dist.zip
+
+# Publish a new version of the library to NPM
+npm run dist
+```
+
 ## Notes
 
 This is not an official Google product.

package.json

@@ -0,0 +1,21 @@
+{
+  "name": "codelab-elements",
+  "version": "1.0.0",
+  "description": "Custom elements for codelabs",
+  "main": "index.js",
+  "scripts": {
+    "clean": "node_modules/.bin/bazel clean",
+    "build": "node_modules/.bin/bazel build npm_dist",
+    "test": "node_modules/.bin/bazel test --test_output=all codelab-elements/demo:hello_test",
+    "pub": "npm run clean && npm run build && cd bazel-genfiles && unzip npm_dist.zip -d npm_dist && npm publish npm_dist"
+  },
+  "author": "Google",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/googlecodelabs/tools.git"
+  },
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "@bazel/bazel": "^0.18.1"
+  }
+}