@spartacus/core
Version:
Spartacus - the core framework
44 lines • 6.75 kB
JavaScript
export const initialLoaderState = {
loading: false,
error: false,
success: false,
value: undefined,
};
/**
* Higher order reducer that adds generic loading flag to chunk of the state
*
* Utilizes "loader" meta field of actions to set specific flags for specific
* action (LOAD, SUCCESS, FAIL, RESET)
*/
export function loaderReducer(entityType, reducer) {
return (state = initialLoaderState, action) => {
if (action.meta &&
action.meta.loader &&
action.meta.entityType === entityType) {
const entity = action.meta.loader;
if (entity.load) {
return Object.assign(Object.assign({}, state), { loading: true, value: reducer ? reducer(state.value, action) : state.value });
}
else if (entity.error) {
return Object.assign(Object.assign({}, state), { loading: false, error: true, success: false, value: reducer ? reducer(state.value, action) : undefined });
}
else if (entity.success) {
return Object.assign(Object.assign({}, state), { value: reducer ? reducer(state.value, action) : action.payload, loading: false, error: false, success: true });
}
else {
// reset state action
return Object.assign(Object.assign({}, initialLoaderState), { value: reducer
? reducer(initialLoaderState.value, action)
: initialLoaderState.value });
}
}
if (reducer) {
const newValue = reducer(state.value, action);
if (newValue !== state.value) {
return Object.assign(Object.assign({}, state), { value: newValue });
}
}
return state;
};
}
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