Function normalize

src/chart/lines/linesVisual.ts:28–33

(a: string | number | (string | number)[])

function normalize(a: string | string[]): string[];
function normalize(a: number | number[]): number[];
function normalize(a: string | number | (string | number)[]): (string | number)[] {
    if (!(a instanceof Array)) {
        a = [a, a];
    }
    return a;
}

const linesVisual: StageHandler = {
    seriesType: 'lines',