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Local Development

Prerequisites

Required:

  • Node.js (minimum version declared in package.json)

Recommended:

  • VSCode Plugins:
    • ESLint (dbaeumer.vscode-eslint)
    • Prettier (esbenp.prettier-vscode)
    • Prettier ESLint (rvest.vs-code-prettier-eslint)
  • Docker & Docker Compose - Required for running smoke tests.
    • Docker Desktop is a reliable choice if you don't have your own preference.
  • bats-core and jq - Required for running smoke tests

Main Commands

# install all dependencies from package.json
npm install

# compile the typescript source to javascript in a dist directory
npm run build

# prettier will specify files that need formatting changes
npm run check-format

# eslint will specify files that have linting errors
npm run lint

# run unit tests with jest
npm run test

Smoke Tests

Smoke tests use Cypress and Docker using docker-compose, exporting telemetry to a local collector. Tests are run using bats-core and jq, bash tools to make assertions against the telemetry output.

Install bats-core and jq for local testing:

brew install bats-core
brew install jq

Smoke tests can be run with either npm scripts or with make targets (the latter works better in CI).

# run smoke tests with cypress and docker
npm run test:smoke

# alternative using make: run smoke tests with cypress and docker (used in CI)
make smoke

The results of both the tests themselves and the telemetry collected by the collector are in a file data.json in the smoke-tests directory. These artifacts are also uploaded to Circle when run in CI.

After smoke tests are done, tear down docker containers:

npm run test:unsmoke

# alternative using make
make unsmoke

Example Application

The example app uses a local install of the root directory's code, so make sure that is built first.

# navigate to example app
cd ./examples/hello-world-web

# install dependencies, including local source package
npm install

# add api key into index.js

# bundle and run example in watch mode to update when source changes
npm run dev

To see output in the console in the browser, be sure to enable the console level Verbose in Console Dev Tools.

Running with Docker-Compose

You can also use the docker-compose file to run in Docker.

docker-compose up --build app-hello-world-web

To run the app with a collector (also included in docker-compose here):

docker-compose up --build

When finished:

docker-compose down

Building a Tarball for Local Development

To get a tarball to use as a local dependency:

npm run build
npm pack

This creates a file in the root directory like this: honeycombio-opentelemetry-web-0.1.42.tgz To use as a dependency in another project, install it with npm:

npm install honeycombio-opentelemetry-web-0.1.1.tgz

This will create a dependency in your package.json like this:

  "dependencies": {
    "@honeycombio/opentelemetry-web": "file:honeycombio-opentelemetry-web-0.1.42.tgz",
  }