Support readonly types with inference

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readonly without type

Today, in order to use a readonly type with inference you need to know typeof exists

const user = {
  name: "orta"
}

const readonlyUsers: readonly typeof user[] = [user]

It would be nice to support shorthand syntax for this:

const user = {
  name: "orta"
}

const readonlyUsers: readonly = [user]

Where the lack of a definition outside of readonly implies you want to keep the inferred type.

Making it cheaper syntactically to use readonly more often without using slightly more esoteric typescript features.

Could be negated by these though:

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.