Set context of this keyword in definition file

Search Terms

set this context in typescript definition file

Suggestion

A way to change the context of this keyword in a type definition file. This is admittedly a weird feature since, to my knowledge, it doesn't really align with how modules work. Perhaps there is another way to achieve this use case.

Use Cases

Here's a video of how my application works - https://vimeo.com/315553984

I have an application that allows users to write code which will then be executed via the Function API - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function
Here's a simplified version of how the app works at its core -

const userCode = `
  console.log(this, foo, bar);
`;
const func = Function('foo', 'bar', userCode);
func.call({myThis: 'hello'}, 'fooString', 'barString');

My app allows users to write their code in Monaco editor and I've successfully added type definitions for the foo and bar variables via the addExtraLib method - https://microsoft.github.io/monaco-editor/api/interfaces/monaco.languages.typescript.languageservicedefaults.html

So when the user starts to type foo intellisense informs them that it is a string. I'd like to do the same for the this keyword.

Examples

See use cases ^

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, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

Commencez par examiner comment les fichiers de définition TypeScript représentent le mot-clé this et comment ces informations parviennent au service de langage de Monaco via addExtraLib. Utilisez l’exemple de l’API Function comme cas d’utilisation cible et vérifiez qu’IntelliSense de l’éditeur peut déduire le contexte this demandé sans modifier le comportement d’exécution de JavaScript.