class merge generic parameters

[lzxb]

Suggestion

class Component<Props extends {}> {
    public constructor (props: Props) {
        Object.assign(this, props);
    }
}

class App extends Component<{ name: string }> {
    public init() {
        // Property 'name' does not exist on type 'App'.ts(2339)
        this.name
    }
}

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✅ Viability Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

⭐ Suggestion

📃 Motivating Example

💻 Use Cases

[lzxb]

Is there a way to make the above code work

[MartinJohns]

Duplicate of #26792.