nulltier/create-union-type-from-array.ts

## create-union-type-from-array.ts
/*
    The source of the solution
    https://stackoverflow.com/questions/45251664/typescript-derive-union-type-from-tuple-array-values
*/

const listOfLetters = ['a', 'b', 'c'] as const;
type Letter = typeof list[number]; // 'a'|'b'|'c';
let itIsOk: Letter = 'a';
let itIsNot: Letter = 'd';
	/*
	The source of the solution
	https://stackoverflow.com/questions/45251664/typescript-derive-union-type-from-tuple-array-values
	*/

	const listOfLetters = ['a', 'b', 'c'] as const;
	type Letter = typeof list[number]; // 'a'\|'b'\|'c';
	let itIsOk: Letter = 'a';
	let itIsNot: Letter = 'd';