nulltier · July 20, 2019 22:17
diff --git a/create-union-type-from-array.ts b/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';