Defining environment variables

This example shows how you can set environment variables when running Bazel, then access them inside your program.

1. Use the --define=some_env=some_value option to Bazel, as shown here in package.json
2. Bazel is hermetic, so if you want some_env to be exposed into the environment of an action, it must be declared, using configuration_env_vars = ["some_env"] as shown here in BUILD.bazel.
3. In your Node.js program, reference process.env['some_env'] as usual, shown here in define.spec.js.