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import React from "react"; import PropTypes from "prop-types"; import invariant from "tiny-invariant"; import Lifecycle from "./Lifecycle.js"; import RouterContext from "./RouterContext.js"; /** * The public API for prompting the user before navigating away from a screen. */ function Prompt({ message, when = true }) { return ( <RouterContext.Consumer> {context => { invariant(context, "You should not use <Prompt> outside a <Router>"); if (!when || context.staticContext) return null; const method = context.history.block; return ( <Lifecycle onMount={self => { self.release = method(message); }} onUpdate={(self, prevProps) => { if (prevProps.message !== message) { self.release(); self.release = method(message); } }} onUnmount={self => { self.release(); }} message={message} /> ); }} </RouterContext.Consumer> ); } if (__DEV__) { const messageType = PropTypes.oneOfType([PropTypes.func, PropTypes.string]); Prompt.propTypes = { when: PropTypes.bool, message: messageType.isRequired }; } export default Prompt;
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