Description

This PR introduces method's arguments validation.

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• the pull request targets the default branch of the repository (develop)
• the code follows the established code style of the repository
  • npm run prettier:check passes
  • npm run lint:check passes
• tests are added for the changes I made (if any source code was modified)
• documentation added or updated
• I have run the project locally and verified that there are no errors

Fixes

#115

This is a naive implementation that can be extended if needed.

How it works:

1. IsNotEmptyArgument argument decorator "registers" validation in the target object (just an array of strings like <methodName>:<parameterIndex>:<validatorName>)
2. ValidateArguments method decorator reads all registered validations and executes them.

This scheme with 2 decorators instead of just one argument decorator is only needed because argument level decorator can't access actual argument value (it's weird)

Usage example:

export class MyClass {
    @ValidateArguments
    async myMethod(@IsNotEmptyArgument test: string): Promise<void> {
        ...
    }
}