lib/getImportGlobalsSrc.js
function getImportGlobalsSrc(ignore) {
    var key,
        value,
        src = "",
        globalObj = typeof global === "undefined"? window: global;

    ignore = ignore || [];
    // global itself can't be overridden because it's the only reference to our real global objects
    ignore.push("global");
    // ignore 'module', 'exports' and 'require' on the global scope, because otherwise our code would
    // shadow the module-internal variables
    // @see https://github.com/jhnns/rewire-webpack/pull/6
    ignore.push("module", "exports", "require");

    for (key in globalObj) { /* jshint forin: false */
        if (ignore.indexOf(key) !== -1) {
            continue;
        }
        value = globalObj[key];

        // key may be an invalid variable name (e.g. 'a-b')
        try {
          eval("var " + key + ";");
          src += "var " + key + " = global." + key + "; ";
        } catch(e) {}
    }

    return src;
}
function getImportGlobalsSrc(ignore) {
    var key,
        value,
        src = "",
        globalObj = typeof global === "undefined"? window: global;

    ignore = ignore || [];
    // global itself can't be overridden because it's the only reference to our real global objects
    ignore.push("global");
    // ignore 'module', 'exports' and 'require' on the global scope, because otherwise our code would
    // shadow the module-internal variables
    // @see https://github.com/jhnns/rewire-webpack/pull/6
    ignore.push("module", "exports", "require");

    for (key in globalObj) { /* jshint forin: false */
        if (ignore.indexOf(key) !== -1) {
            continue;
        }
        value = globalObj[key];

        // key may be an invalid variable name (e.g. 'a-b')
        try {
          eval("var " + key + ";");
          src += "var " + key + " = global." + key + "; ";
        } catch(e) {}
    }

    return src;
}
function getImportGlobalsSrc ( ignore ) { var key , value , src = "" , globalObj = typeof global === "undefined" ? window : global ; ignore = ignore || [ ] ; // global itself can't be overridden because it's the only reference to our real global objects ignore . push ( "global" ) ; // ignore 'module', 'exports' and 'require' on the global scope, because otherwise our code would // shadow the module-internal variables // @see https://github.com/jhnns/rewire-webpack/pull/6 ignore . push ( "module" , "exports" , "require" ) ; for ( key in globalObj ) { /* jshint forin: false */ if ( ignore . indexOf ( key ) !== - 1 ) { continue ; } value = globalObj [ key ] ; // key may be an invalid variable name (e.g. 'a-b') try { eval ( "var " + key + ";" ) ; src += "var " + key + " = global." + key + "; " ; } catch ( e ) { } } return src ; }
Declares all globals with a var and assigns the global object. Thus you're able to
override globals without changing the global object itself.

Returns something like
"var console = global.console; var process = global.process; ..."

@return {String}
Declares all globals with a var and assigns the global object . Thus you re able to override globals without changing the global object itself .