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@indutny/rezip-electron

v1.3.1

Published

Re-compress Electron macOS installer zip files for better incremental updates

Downloads

1,379

Vulnerabilities

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Links

Git

Maintainers

indutnyindutny

Keywords

electronzipmacoscompressblockmap

Readme

@indutny/rezip-electron

npm

When generating the build files for macOS with electron-builder the two natural artifacts for the updates are:

  • a compressed zip file with the app
  • a blockmap file

Where blockmap file is leveraged for effective incremental downloads, or in other words downloading only the updated parts of the new version of the app.

While using incremental downloads reduces download size dramatically it behaves unoptimally with regards to the asar package that contains most app's source files. The reason for this is that in a zip archive all files are compressed individually, but after compression each file has a high entropy and looks like mostly different blob when comparing the blockmaps.

This CLI tool mitigates this by taking in account the asar file structure when compressing it. Instead of deflating whole file as a single blob, we split it into logical chunks (one for every sub-file) and flush zlib stream after each chunk. This means that the same sub-files in asar are likely to result in the same compressed binary chunks in the resultant optimized .zip file.

Installation

npm install -g @indutny/rezip-electron

Usage

rezip-electron optimize app.zip -o app.opt.zip

Example

Before optimization:

$ rezip-electron compare signal-desktop-mac-arm64-6.48.0.zip \
    signal-desktop-mac-arm64-6.48.1.zip
# ...A lot of changed files...
Total Download Size: 10.00mb

After optimization:

$ rezip-electron compare signal-desktop-mac-arm64-6.48.0.opt.zip \
    signal-desktop-mac-arm64-6.48.1.opt.zip
# ...Way less changed files...
Total Download Size: 2.87mb

LICENSE

This software is licensed under the MIT License.