Function normalizeExtensions

src/cm/themes/index.js:48–59

(value, target = [])

const warnedInvalidThemes = new Set();

function normalizeExtensions(value, target = []) {
	if (Array.isArray(value)) {
		value.forEach((item) => normalizeExtensions(item, target));
		return target;
	}

	if (value !== null && value !== undefined) {
		target.push(value);
	}

	return target;
}

function toExtensionGetter(getExtension) {
	if (typeof getExtension === "function") {