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.

Bắt đầu bằng việc xem xét cách các tệp định nghĩa TypeScript biểu diễn từ khóa this và cách thông tin đó đến được language service của Monaco thông qua addExtraLib. Sử dụng ví dụ về API Function làm trường hợp sử dụng mục tiêu, và xác minh rằng IntelliSense của trình soạn thảo có thể suy luận ngữ cảnh this được yêu cầu mà không thay đổi hành vi runtime của JavaScript.