src/closure-externs/modularize-externs.js - external/github.com/kripken/emscripten - Git at Google

 // In MODULARIZE mode the JS code may be executed later, after `document.currentScript` is gone, so we store
 // it to `_scriptName` outside the wrapper function. Therefore, it cannot be minified.
 // In EXPORT_ES6 mode we use `import.meta.url` and for Node.js CommonJS builds we use `__filename`.

 /**
  * @suppress {duplicate, undefinedVars}
  */
 var _scriptName;
	// In MODULARIZE mode the JS code may be executed later, after `document.currentScript` is gone, so we store
	// it to `_scriptName` outside the wrapper function. Therefore, it cannot be minified.
	// In EXPORT_ES6 mode we use `import.meta.url` and for Node.js CommonJS builds we use `__filename`.

	/**
	* @suppress {duplicate, undefinedVars}
	*/
	var _scriptName;