Function ensureScaleStore

src/coord/scaleRawExtentInfo.ts:487–493

* NOTE: `associateSeriesWithAxis` is not necessarily called, e.g., when * an axis is not used by any series.

(axisLike: {scale: Scale})

 * an axis is not used by any series.
 */
function ensureScaleStore(axisLike: {scale: Scale}) {
    const store = scaleInner(axisLike.scale);
    if (!store.extent) {
        store.extent = initExtentForUnion();
    }
    return store;
}

/**
 * This supports union extent on case like: pie (or other similar series)