# UNSAFE_DYNAMIC_SCRIPT: Component runs a script built at run time

> Component runs a script built at run time

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| Severity | Fault                         | Stage        |
| -------- | ----------------------------- | ------------ |
| error    | customer (the source package) | build output |

## What it means

The component starts code that is not in the published bundle: a JavaScript Blob, a Worker or SharedWorker, importScripts, a service worker, a worklet module or WebAssembly. That code escapes every check of the build, and its source map annotations escape the neutralization of the stored bytes (rule dynamic-script).

## How to fix

Do the work in the component's own code, on the main thread; heavy computing belongs on a server the component calls.