[BUG] Javascript generated SDK

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

JavaScript generated SDKs do not include Intellisense for the built product. The un-built files in the src file include intellisense and work for autocomplete, but the dist folder after building does not.

openapi-generator version

5.0.0

OpenAPI declaration file content or url

N/A

Generation Details

Steps to reproduce

openapi-generator-cli generate -i /path/to/opeanpi.yaml -g javascript -o /path/to/outputfolder --additional-properties=usePromises=true

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/issues/1046

Suggest a fix

Start with the provided openapi-generator-cli command and compare the generated JavaScript SDK's src and dist folders after building. Confirm that the built dist output preserves the IntelliSense and autocomplete behavior present in src, using issue 1046 as related context.