add codefix for extracting an interface from an object literal

[zpdDG4gta8XKpMCd]

given an anonimous object literal, allow extracting interface by looking at the effective types of the values of the properties

[basarat]

I've used json2dts in the past e.g in alm.tools

But I too would like something better that's language service driven ❤️

Quick question: Can you write code before, trigger point, code after. I imagine a Add type annotation would be really useful:

// before
const foo = {hello:'world'};
//       ^  trigger anywhere in variable name "Add type annotation"

// after
const foo:{hello: string} = {hello:'world'};

🌹

[DanielRosenwasser]

@basarat sounds like you might want #13199.