Steps to reproduce

1. generate apiclient for typescript-node
2. check defaultHeaders property in apiclient class: it's not possible to get or set it

version of OpenAPI Generator used: Master (4.2.3-SNAPSHOT)

Actual output
protected defaultHeaders : any = {};
let localVarHeaderParams: any = (Object).assign({}, this.defaultHeaders);

Expected output
protected _defaultHeaders : any = {};
set defaultHeaders(defaultHeaders: any) {
this._defaultHeaders = defaultHeaders;
}
get defaultHeaders() {
return this._defaultHeaders;
}
let localVarHeaderParams: any = (Object).assign({}, this._defaultHeaders);

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?
• [+] Have you search for related issues/PRs?
• [+] What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

openapi-generator version

OpenAPI declaration file content or url

Command line used for generation

Steps to reproduce

Related issues/PRs

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