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