profiling.js (1362B)
1'use strict'; 2 3function checkDCE() { 4 /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */ 5 if ( 6 typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ === 'undefined' || 7 typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.checkDCE !== 'function' 8 ) { 9 return; 10 } 11 if (process.env.NODE_ENV !== 'production') { 12 // This branch is unreachable because this function is only called 13 // in production, but the condition is true only in development. 14 // Therefore if the branch is still here, dead code elimination wasn't 15 // properly applied. 16 // Don't change the message. React DevTools relies on it. Also make sure 17 // this message doesn't occur elsewhere in this function, or it will cause 18 // a false positive. 19 throw new Error('^_^'); 20 } 21 try { 22 // Verify that the code above has been dead code eliminated (DCE'd). 23 __REACT_DEVTOOLS_GLOBAL_HOOK__.checkDCE(checkDCE); 24 } catch (err) { 25 // DevTools shouldn't crash React, no matter what. 26 // We should still report in case we break this code. 27 console.error(err); 28 } 29} 30 31if (process.env.NODE_ENV === 'production') { 32 // DCE check should happen before ReactDOM bundle executes so that 33 // DevTools can report bad minification during injection. 34 checkDCE(); 35 module.exports = require('./cjs/react-dom.profiling.min.js'); 36} else { 37 module.exports = require('./cjs/react-dom.development.js'); 38}