Function normalizeRegister

src/core/echarts.ts:3243–3287

(
    targetList: StageHandler[],
    priority: number | StageHandler | StageHandlerOverallReset,
    fn: StageHandler | StageHandlerOverallReset,
    defaultPriority: number,
    visualType?: StageHandlerInternal['visualType'],
    checkBlock?: boolean
)

const registeredTasks: (StageHandler | StageHandlerOverallReset)[] = [];

function normalizeRegister(
    targetList: StageHandler[],
    priority: number | StageHandler | StageHandlerOverallReset,
    fn: StageHandler | StageHandlerOverallReset,
    defaultPriority: number,
    visualType?: StageHandlerInternal['visualType'],
    checkBlock?: boolean
): void {
    if (isFunction(priority) || isObject(priority)) {
        fn = priority as (StageHandler | StageHandlerOverallReset);
        priority = defaultPriority;
    }

    if (__DEV__) {
        if (isNaN(priority) || priority == null) {
            throw new Error('Illegal priority');
        }
        // Check duplicate
        each(targetList, function (wrap) {
            assert((wrap as StageHandlerInternal).__raw !== fn);
        });
    }

    // Already registered
    if (indexOf(registeredTasks, fn) >= 0) {
        return;
    }
    registeredTasks.push(fn);

    const stageHandler = Scheduler.wrapStageHandler(fn, visualType);

    stageHandler.__prio = priority;
    stageHandler.__raw = fn;
    targetList.push(stageHandler);

    if (__DEV__) {
        if (checkBlock) {
            assert(
                !stageHandler.dirtyOnOverallProgress,
                `dirtyOnOverallProgress is not allowed in ${visualType} stage;`
                + ' otherwise progressive rendering is disabled on all series.'
            );
        }
    }
}

export function registerLoading(
    name: string,