fix: reading data from spawned process

[VitaliyR]

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Summary

Spawned processes might return a random data, while ipc.js, when filters messages, expects it to be in array format.

When process sends non-array object, it produces the uncaught error and stops the build.

I've discovered this when started netlify dev with plugin-visual-editor on the site with astro and sanity. Plugin-visual-editor launches stackbit dev, which imports a content-engine, which calls process.send(/* OBJECT */) and crashes the build.

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[github-actions]

This pull request adds or modifies JavaScript (.js, .cjs, .mjs) files.
Consider converting them to TypeScript.

[serhalp]

LGTM, thanks for adding a fixture!

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud