`keyof` for Map

[fregante]

Context: https://stackoverflow.com/q/60737502

const obj = {first: 'First Name', last: 'Last Name'};
type Keys = keyof typeof obj; // first | last

const map = new Map([
	[first, 'First Name'],
	[last: 'Last Name']
]);
type Keys = ????????

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[fregante]

• Related/similar: https://github.com/sindresorhus/type-fest/issues/115