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: * [x] This wouldn't be a breaking change in existing TypeScript / JavaScript code * [x] This wouldn't change the runtime behavior of existing JavaScript code * [x] This could be implemented without emitting different JS based on the types of the expressions * [x] This isn't a runtime feature (e.g. new expression-level syntax)