Windows builds fail intermittently due to Rollup Terser worker crashes and OOM

[Shreyas2004wagh]

Description

On Windows, monorepo/workspace builds intermittently fail during Rollup minification with errors such as:

• Call retries were exceeded
• spawn UNKNOWN
• JavaScript heap out of memory

This instability affects package builds (notably @embeddedchat/markups, @embeddedchat/react, @embeddedchat/ui-elements, and @embeddedchat/ui-kit) and blocks reliable local builds and CI on Windows.

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Steps to reproduce

1. Use Windows 10/11
2. Node.js v16.19.0
3. Yarn v3.6.4
4. Run one of the following:
   • yarn workspace @embeddedchat/markups build
   • yarn workspace @embeddedchat/react build
   • or yarn build at repo root
5. Observe intermittent Rollup failures during minification

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Expected behavior

Workspace and monorepo builds should complete consistently on Windows without worker crashes or memory-related failures.

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Actual behavior

Builds intermittently fail during Rollup minification with worker process crashes and OOM errors, even when no code changes are made.

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Root cause

rollup-plugin-terser defaults to spawning multiple worker processes.
For large bundles in this monorepo, this creates excessive process and memory pressure on Windows, leading to instability.

Additionally, direct source imports (e.g. @embeddedchat/markups/src) cause Storybook parsing failures in some environments.

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Proposed fix

• Throttle Terser workers in Rollup configs:

  terser({ numWorkers: 1 })

[Shreyas2004wagh]

I’ve opened a PR addressing this: #1138