export default function mutator()

in src/mutator.ts [10:34]

• 20 lines of code
• 2 McCabe index (conditional complexity)

export default function mutator<TAction extends ActionMessage, TReturn>(
    actionCreator: ActionCreator<TAction>,
    target: MutatorFunction<TAction, TReturn>
): MutatorFunction<TAction, TReturn> {
    let actionId = getPrivateActionId(actionCreator);
    if (!actionId) {
        throw new Error('Mutators can only subscribe to action creators.');
    }

    // Wrap the callback in a MobX action so it can modify the store
    const actionType = getPrivateActionType(actionCreator);
    let wrappedTarget = action(actionType, (actionMessage: TAction) => {
        try {
            getGlobalContext().currentMutator = actionType;
            target(actionMessage);
        } finally {
            getGlobalContext().currentMutator = null;
        }
    });

    // Subscribe to the action
    subscribe(actionId, wrappedTarget);

    return target;
}