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frontend/build-scripts
Steve Repsher e22e3e88a0 Speed up and simplify translations build (#19988)
* Speed up and simplify translations build

- Remove use of gulp-flatmap for merges (wasted input) and just loop over translation files.
- Parse and buffer master only once for all merges.
- Remove lokalise key reference transform from non-English files. This is already done by Lokalise when they are downloaded.
- Remove tabs from merged output to minimize buffer sizes.
- Pipe merges to a hashing stream, removing extra tasks and intermediate file I/O.
- Pipe hashed files to a single custom asynchronous transform stream to fragmentize the files. It expands the stream to push a new file for each fragment.
- Incorporate flattening into fragmentization.
- Delete entire ui.panel key for base translation (instead of leaving an empty object).
- Optimize flatten method to stop copying output over and over.
- Convert empty and test filters to JSON.parse() revivers for simplicity and better performance.
- Incorporate supervisor builds into main tasks using a simple toggle (i.e. remove duplicate code).
- Funcify local tasks and simplify exported tasks.
- Incorporate test metadata task into a simplified metadata task.

* Fix Lokalise key reference link

Co-authored-by: Simon Lamon <32477463+silamon@users.noreply.github.com>

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Co-authored-by: Simon Lamon <32477463+silamon@users.noreply.github.com>
2024-04-12 12:49:18 +02:00
..
2020-11-18 08:46:42 +00:00

Bundling Home Assistant Frontend

The Home Assistant build pipeline contains various steps to prepare a build.

  • Generating icon files to be included
  • Generating translation files to be included
  • Converting TypeScript, CSS and JSON files to JavaScript
  • Bundling
  • Minifying the files
  • Generating the HTML entrypoint files
  • Generating the service worker
  • Compressing the files

Converting files

Currently in Home Assistant we use a bundler to convert TypeScript, CSS and JSON files to JavaScript files that the browser understands.

We currently rely on Webpack but also have experimental Rollup support. Both of these programs bundle the converted files in both production and development.

For development, bundling is optional. We just want to get the right files in the browser.

Responsibilities of the converter during development:

  • Convert TypeScript to JavaScript
  • Convert CSS to JavaScript that sets the content as the default export
  • Convert JSON to JavaScript that sets the content as the default export
  • Make sure import, dynamic import and web worker references work
    • Add extensions where missing
    • Resolve absolute package imports
  • Filter out specific imports/packages
  • Replace constants with values

In production, the following responsibilities are added:

  • Minify HTML
  • Bundle multiple imports so that the browser can fetch less files
  • Generate a second version that is ES5 compatible

Configuration for all these steps are specified in bundle.js.