medium
node•Jan 8, 2026
node.js Worker thread with Typescript
A frustrating error encountered since updating to Node.js 20 can be resolved by using Vite's vite-node and a wrapper strategy to run .ts files using Worker.
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Original source
Key summary
A solution for running .ts files using Worker in Node.js 20 is presented, leveraging Vite's vite-node and a wrapper strategy to bridge the gap between Node.js Worker's expected .js or .mjs extensions and TypeScript files.
TL;DR
- Node.js 20 update causes a frustrating error when running .ts files with Worker.
- Vite's vite-node provides a solution to run scripts within the Vite environment.
- A wrapper strategy is needed to bridge the gap between Node.js Worker's expected .js or .mjs extensions and TypeScript files.
- The solution involves using vite-node's programmatic API to load and execute the TypeScript worker.
- A wrapper file (worker_wrapper.mjs) is used to point the Worker instance to the actual target path via workerData.
- The actual worker logic lives in the TypeScript file, but must follow real chunk path for after-built worker.
- This solution is particularly useful for those using Vite in their environment.
This content is automatically summarized using AI. For full context, always refer to the original article.
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