proposal: Define config types and validate those

[peaceiris]

Is your feature request related to a problem? Please describe.

Validate config file at first.

Describe the solution you'd like

• Dynamic type validation in TypeScript - LogRocket Blog

Libraries

• ajv-validator/ajv: The fastest JSON schema Validator. Supports JSON Schema draft-04/06/07/2019-09/2020-12 and JSON Type Definition (RFC8927)
• sideway/joi: The most powerful data validation library for JS
• imbrn/v8n: ☑️ JavaScript fluent validation library
• ansman/validate.js: A declarative validation library written javascript

Describe alternatives you've considered

Additional context

[github-actions]

Thank you @peaceiris for suggesting this.

Log | Bot Usage

[Andre601]

export interface Labeled {
    issue: Issue;
    pr?:   Issue;
}

This wonders me... Would this make issue required? SInce it lacks the ? which to my basic ts knowledge makes it optional/nullable?

[peaceiris]

That is a simple example generated with yaml-to-typescript. In order to avoid misunderstandings, I have deleted that and added some useful libraries for validation.