Add postinstall hook to remove the webworker-threads module

[jasonrudolph]

In an attempt to resolve the problem described in #67 (comment), this pull request adds a postinstall hook to delete the webworker-threads module as described in #67 (comment).

This is admittedly a hack, and I'm not certain that it will resolve the issue, but we'll give it a shot.

If this does resolve the issue, we can consider it a temporary workaround, and we can remove this workaround when the spelling-manager module no longer depends on the natural module (#67 (comment)), or when the natural module makes the webworker-threads module a peer dependency (NaturalNode/natural#368) instead of an optional dependency.

/fyi @dmoonfire @maxbrunsfeld

[jasonrudolph]

I've tested this on macOS, Windows 10, and Ubuntu as a sanity check regarding cross-platform compatibility. In each case, I did the following:

git clone https://github.com/atom/spell-check
cd spell-check
apm link
apm install

Then, verify that node_modules/webworker-threads is present.

Then:

git checkout jr-investigate-67
apm install

Then, verify that node_modules/webworker-threads is not present.

Then, open Atom and run the "Spell Check: Toggle" command on a file to verify that spell check is still working.

[jasonrudolph]

It doesn't seem like this change is going to have the desired effect. 😩 While the approach in this pull request successfully removed the webworker-threads module in the scenario described in #244 (comment), it doesn't seem to remove the module when bundling the spell-check package as part of a full Atom build.

I published a patch version of this package (0.73.2) and updated atom/atom to use that version (atom/atom@282fd85). I then downloaded resulting atom-mac.zip built by CI for that commit. Unfortunately, webworker-threads is still present:

$ tree /Applications/Atom.app/Contents/Resources/app.asar.unpacked/node_modules/webworker-threads
/Applications/Atom.app/Contents/Resources/app.asar.unpacked/node_modules/webworker-threads
└── build
    └── Release
        └── WebWorkerThreads.node

2 directories, 1 file

I'll see if I can find an approach that will meet our needs. If anyone has ideas, definitely let me know. 😅🙏

[dmoonfire]

I added an issue to spelling-manager to get rid of the dependency: dmoonfire/spelling-manager-js#4.