Short Notes on JS

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Fetch Patterns

fetch("url", { options... })
  .then((response) => {
    if (!response.ok)
      throw new Error('Network response was not ok');
    return response.json();  // or response.blob(), etc.
  .then((data) => {
    // do something with the data received
  .catch((error) => {
    console.error('Failed to fetch:', error);

Environment Variables in WebPack

WebPack does not have access to environment (duh), so you need to "bake" any relevant environment variables in the WebPack during build:

new webpack.DefinePlugin({
  'process.env': {
    NODE_ENV: JSON.stringify(process.env.NODE_ENV),
    STAGE: JSON.stringify(process.env.STAGE),
    // ...

Debugging in VS Code on Linux

  • install Debugger for Chrome extension
  • open the launch.json file, and edit as follows:
    • custom profile - user-data-dir - is used, to make sure you have clean (enough) slate
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit:
  "version": "0.2.0",
  "configurations": [
      "type": "chrome",
      "request": "launch",
      "runtimeExecutable": "/usr/bin/chromium-browser",
      "runtimeArgs": ["--remote-debugging-port=9222", "--user-data-dir=/home/user/tmp/remote-profile"],
      "name": "Launch Chrome against localhost",
      "url": "http://localhost:3000",
      "webRoot": "${workspaceFolder}"
  • run the npm (the port used should correspond to the url key above)
  • hit debug in VS Code, add breakpoints, etc., and enjoy!
    • this will actually open new browser window, as subwindow of VS Code, neat!