callback-this-type

Provide a Type for this in Callbacks if It's Part of Their API

When a library calls a user-provided callback with a specific this context, that context is part of the API. TypeScript allows you to type this as the first parameter of a function, even though it's not a real parameter. This documents and enforces the expected context.

Type this as the first parameter when it's part of your callback API. This documents the expected context and enables autocompletion.

当回调使用它时使用。当 API 提供此上下文时使用。在键入事件处理程序时使用。当库在回调中设置此项时使用。在记录回调上下文时使用。 来源：marius-townhouse/effective-typescript-skills。