How to create a global variable in javascript (using webpack) -

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i'm using react js webpack, webpack-dev-server , ecmascript 6. have undeclared variable in file named data.js. however, cannot modify data.js file since standard. there way can make variable global js file? tried declaring window.myvarnamein file data.js referenced using import statement still giving error uncaught referenceerror: myvarname not defined

define object in file below 

var data={    myvarname:""  };

and call want

data.myvarname;


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