The parameter names and positions of an overridden method must match its ancestor's

[mlhaufe]

There is no native API in the current version of ECMAScript (ECMAScript 2020) for accessing function parameters. There is only someFunction.length which is also imperfect. The alternative is to parse the string representation of the function. A regular expression is no longer sufficient though due to the new patterns and default values allowed in method declarations. Example:

class Foo {
  method({size = 'big', coords = {x: 0, y: 0}, radius = 25} = {}){ ... }
}

Sadly there is no native parser in the language either. The closest is the SpiderMonkey specific extension Reflect.parse(...) which is not currently on the standards track. The 3rd party option is the acorn library. This would effectively double the size of the contracts library or more if used...

Extending the Babel or TypeScript compiler is out of scope as the desire is to keep this library standards compliant and not extend the language itself

This should be a deferred requirement...

[mlhaufe]

TypeScript 4.3 has added an override keyword.
This should be compatible but would be syntactically redundant in TypeScript usage.

class SomeClass extends BaseClass {
  @override
  override method(a,b,c){ ... }
}

The pro/cons are:

override	@override
Compile Time	Runtime
TypeScript Only	TypeScript and JavaScript
Enforces type constraints	Enforces parameter count constraint