[BUG][Typescript-axios] Typescript 4.0.x: the operand of a 'delete' operator must be optional

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

Upgrading to TypeScript 4.0.x now causes issues within the AxiosParamCreator function. It will complain about:

generated/api.ts:149:20 - error TS2790: The operand of a 'delete' operator must be optional.

Further reference: https://devblogs.microsoft.com/typescript/announcing-typescript-4-0/#operands-for-delete-must-be-optional

openapi-generator version

v5.0.0-beta

OpenAPI declaration file content or url

https://github.com/sebas2day/typescript-axios-error

Generation Details

typescript-axios

Steps to reproduce

1. wget https://repo1.maven.org/maven2/org/openapitools/openapi-generator-cli/5.0.0-beta/openapi-generator-cli-5.0.0-beta.jar
2. yarn
3. java -jar openapi-generator-cli-5.0.0-beta.jar generate -i spec.yaml -g typescript-axios -o generated
4. yarn tsc -b -f

Outcome:

generated/api.ts:71:20 - error TS2790: The operand of a 'delete' operator must be optional.

71             delete localVarUrlObj.search;
                      ~~~~~~~~~~~~~~~~~~~~~


Found 1 error.

error Command failed with exit code 1.

Related issues/PRs

NA

Suggest a fix

Instead of using delete it would be better to assign it with null.

[macjohnny]

@luixal this should be fixed in 5.0.0 beta

[sapphi-red]

@sebas2day I think that is a typescript issue. (https://github.com/DefinitelyTyped/DefinitelyTyped/issues/34960)