33 lines
1023 B
JavaScript
33 lines
1023 B
JavaScript
|
// @flow
|
||
|
|
|
||
|
|
import { getAppProp } from '../app';
|
||
|
|
import { toState } from '../redux';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Gets the value of a specific feature flag.
|
||
|
|
*
|
||
|
|
* @param {Function|Object} stateful - The redux store or {@code getState}
|
||
|
|
* function.
|
||
|
|
* @param {string} flag - The name of the React {@code Component} prop of
|
||
|
|
* the currently mounted {@code App} to get.
|
||
|
|
* @param {*} defaultValue - A default value for the flag, in case it's not defined.
|
||
|
|
* @returns {*} The value of the specified React {@code Compoennt} prop of the
|
||
|
|
* currently mounted {@code App}.
|
||
|
|
*/
|
||
|
|
export function getFeatureFlag(stateful: Function | Object, flag: string, defaultValue: any) {
|
||
|
|
const state = toState(stateful)['features/base/flags'];
|
||
|
|
|
||
|
|
if (state) {
|
||
|
|
const value = state[flag];
|
||
|
|
|
||
|
|
if (typeof value !== 'undefined') {
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Maybe the value hasn't made it to the redux store yet, check the app props.
|
||
|
|
const flags = getAppProp(stateful, 'flags') || {};
|
||
|
|
|
||
|
|
return flags[flag] || defaultValue;
|
||
|
|
}
|