Remove sourcemaps from add-on?

[pdehaan]

I downloaded and extracted the XPI and it looks like the directory is ~12MB (per du -sh).

I did a bit of digging and it looks like we have around 7.2MB of *.map files, and around 1.3MB of *.woff* files.

node file-lint.js

.map    => 7,234.466 KB
.woff   => 714.438 KB
.woff2  => 578.016 KB

const fs = require("fs");
const glob = require("globby");

main([".map", ".woff", ".woff2"]);

async function main(exts=[]) {
  for (const ext of exts) {
    const files = await glob(`*${ext}`);
    const extSize = files.reduce((acc, file) => acc += fs.statSync(file).size, 0);
    console.log(`${ext}\t=> ${Number(extSize / 1024).toLocaleString()} KB`);
  }
}

[pdehaan]

Actually, I revised my script to scan all files in the signed XPI at any depth and try and summarize by file extension:

EXT	FILES	SIZE
.html	5	1 KB
.jpg	8	794 KB
.js	9	2,390 KB
.json	5	9 KB
.map	8	7,234 KB
.png	7	31 KB
.svg	3	8 KB
.woff	31	714 KB
.woff2	31	578 KB

[motin]

Thanks @pdehaan. This is very useful. Personally I like the idea of having sourcemaps included in the bundle since it makes it more transparent how the executable code links up with the package js bundles, but this can also be verified by users/developers by rebuilding the sourcemaps from source, and having a smaller add-on bundle is of course positive. The difference in compressed package size between package with and without sourcemaps would be an important factor.

[pdehaan]

OK, I think I deleted files and re-saved the XPI correctly:

# ls -l regre*.xpi
-rw-r--r--  1 pdehaan  staff  2794327 12 Oct 08:23 regretsreporter-1.0.1-fx (1) copy.xpi
-rw-r--r--@ 1 pdehaan  staff  4663671 12 Oct 08:21 regretsreporter-1.0.1-fx (1).xpi

Or, with prettier file sizes...

# ls -lh regre*.xpi
5464 -rw-r--r--    1 pdehaan  staff   2.7M 12 Oct 08:23 regretsreporter-1.0.1-fx (1) copy.xpi
9112 -rw-r--r--@   1 pdehaan  staff   4.4M 12 Oct 08:21 regretsreporter-1.0.1-fx (1).xpi

Looks like the XPI from https://addons.mozilla.org/firefox/addon/regretsreporter/ is ~4.4MB, but if I edit the archive, delete the .map files and resave, it drops to ~2.7MB (roughly 1.7MB difference -- or 38.63% of the current XPI filesize is sourcemaps).

[motin]

This is very informative, thanks @pdehaan