TS2322: Type '[number, number] | null' is not assignable to type 'void | [number, number]'

[jantimon]

the shortestEdit function return type is [number, number] | void however it returns null in line 335:

json-delta/index.ts

Lines 300 to 336 in 41275a6

	let shortestEdit: [number, number] | void = (function() {
	for (var d = 0; d <= tolerance; ++d) {
	for (var k = -d; k <= d; k += 2) {
	let aIdx: number;
	let takeB = aOfDiagonal[k + 1 + tolerance];
	let takeA = aOfDiagonal[k - 1 + tolerance];
	if (k === -d || (k !== d && takeA < takeB)) {
	aIdx = takeB;
	} else {
	aIdx = takeA + 1;
	}
	let bIdx = aIdx - k;
	while (
	aIdx < aLen &&
	bIdx < bLen &&
	deepEqual(a[aIdx], b[bIdx])
	) {
	aIdx++;
	bIdx++;
	}
	aOfDiagonal[k + tolerance] = aIdx;
	if (aIdx >= aLen && bIdx >= bLen) {
	aOfDiagonalForEditSize[d] = aOfDiagonal.slice();
	return [d, k] as [number, number];
	}
	}
	aOfDiagonalForEditSize[d] = aOfDiagonal.slice();
	}
	return null;
	})();

I can prepare a PR if it helps