[BUG] Javascript generated SDK

Created by: mattknappchhj

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