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/**
* 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}
*/
function getImportGlobalsSrc(ignore) {
var key,
src = "",
globalObj = typeof global === "undefined"? window: global;
ignore = ignore || [];
ignore.push(
// global itself can't be overridden because it's the only reference to our real global objects
"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
"module", "exports", "require",
// strict mode doesn't allow to (re)define 'undefined', 'eval' & 'arguments'
"undefined", "eval", "arguments",
// 'GLOBAL' and 'root' are deprecated in Node
// (assigning them causes a DeprecationWarning)
"GLOBAL", "root",
// 'NaN' and 'Infinity' are immutable
// (doesn't throw an error if you set 'var NaN = ...', but doesn't work either)
"NaN", "Infinity",
);
const globals = Object.getOwnPropertyNames(globalObj);
for (key of globals) {
if (ignore.indexOf(key) !== -1) {
continue;
}
// key may be an invalid variable name (e.g. 'a-b')
try {
eval("var " + key + ";");
src += "var " + key + " = global." + key + "; ";
} catch(e) {}
}
return src;
}
module.exports = getImportGlobalsSrc;
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