Method prepareSource

src/data/helper/sourceManager.ts:186–193

* Always return a source instance. Otherwise throw error.

()

     * Always return a source instance. Otherwise throw error.
     */
    prepareSource(): void {
        // For the case that call `setOption` multiple time but no data changed,
        // cache the result source to prevent from repeating transform.
        if (this._isDirty()) {
            this._createSource();
            this._dirty = false;
        }
    }

    private _createSource(): void {
        this._setLocalSource([], []);