Function isConcreteThemeName

site/src/theme/index.ts:50–54

(
	value: unknown,
)

const concreteThemeSet = new Set<string>(CONCRETE_THEMES);

export const isConcreteThemeName = (
	value: unknown,
): value is ConcreteThemeName => {
	return typeof value === "string" && concreteThemeSet.has(value);
};

type LegacyAutoSync = {
	mode: "sync";