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simple-bundling-js-backend-frontend-boilerplate's Introduction

Simple Bundling JS Server & Web Boilerplate
Compromises:
  • We forgo cache busting via hashing for js as there doesnt seem to be a way to tell parcel to do that if its not handling the html file.
    • Although it is still possible to do it on the server via the ETag
Setup details:
  • Backend uses expressjs for the server
  • The express view engine used is liquid
  • Using nodemon for reloading the server on backend changes
  • Parcel for bundling
    • Parcel also reloads the page on frontend change
    • Parcel also minifies on build
  • concurrently allows us to run all the dev scripts at once in parallel with one command.
  • The run-s in the package.json script is just a shortcut for the npm-run-all program. It runs the npm prod scripts in serial (one after the other).
  • We are using the following babel plugins, presets and macros:
  • We are using flow for type checking on frontend and backend
    • It is set up in the eslint config and also as a npm script to check on build
    • For some reason this file (/node_modules/@parcel/watcher/test/tmp/config.json) breaks flow as it is not proper json, so we have set flow to ignore it in the .flowconfig
    • Parceljs automatically strips the flow typings out
    • In dev, the dev-watch-server npm script runs babel-node via nodemon to strip out the flow typings of the backend code in dev.
    • In prod, we the prod-server-build npm script that just uses babel to strip it out and outputs it to a backend/lib-js. That's why we have the backend/src-js folder and the backend/lib-js folder, so we can keep the same folder structure.
    • Both scripts use the --no-babelrc so it doesnt use the frontend babel config.
  • Using jest for tests
  • We have a js bundle report generated on prod build that opens in the browser
  • We have a flow coverage report generated on prod build that opens in the browser
Additional notes:
  • Can use the dynamic imports to load external libraries after the page has loaded

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