[BUG] [TS] typescript-axios: Ambient declaration `custom.d.ts` not included in build

[alavkx]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
  4.1.3
• Have you search for related issues/PRs?
• What's the actual output vs expected output?

Expected: Consumed in typescript with no build errors
Actual:

Description

Generates typescript files (api.ts, etc) with a relative ref to a custom.d.ts file. tsc ignores declaration files—when the compiled output is moved to dist, the custom.d.ts does not come along for the ride and the relative references now point to src/custom.d.ts. This is problematic when the code is distributed to npm and used in another typescript file.

openapi-generator version

4.1.3

Command line used for generation

openapi-generator generate -i dist/spec.json -o src/gen_client -g typescript-axios

Steps to reproduce

1. Generate new project with openapi-generator generate -i dist/spec.json -o src/gen_client -g typescript-axios

Suggest a fix

Generate a custom.ts instead of a custom.d.ts
Upgrade node and/or @types/node and get ride of the custom.d.ts file altogether

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