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

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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)

从现有的 TypeScript language-service 对“Declare property x”的建议开始，追踪其 code-fix 入口点及测试（如果存在）。添加所要求的替代方案：在构造函数参数中声明 x，并将 private 作为默认修饰符；然后在所描述的类方法场景中验证该建议及其生成的结果。