language service suggestion for Declare property '...' in constructor argument

Search Terms

• typescript declare property in constructor
• typescript language service declare property in constructor

Suggestion

When a non-existing property x is accessed on this in a class method, one of the fixes that ts language service currently suggests, is:

Declare property x

Which adds property x to the class.
It would be nice to also have Declare property x in constructor arguments.
It can use private access modifier by default.

Use Cases

While it's generally useful, it becomes especially handy when developing applications with DI frameworks like Angular that use constructor injection to wire dependencies together.

Examples

-

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. new expression-level syntax)

既存の TypeScript language-service の「Declare property x」提案から始め、その code-fix のエントリーポイントとテスト（存在する場合）を追跡します。constructor arguments で x を宣言し、private をデフォルトの修飾子とする要求された代替案を追加し、説明されている class-method のケースと生成される結果で提案を検証します。