isProvided(exportName) {
		return ModuleGraph.getModuleGraphForModule(
			this,
			"Module.usedExports",
			"DEP_WEBPACK_MODULE_USED_EXPORTS"
		).isExportProvided(this, exportName);
	}
@param {string} exportName a name of an export
@returns {boolean | null} true, if the export is provided why the module.
null, if it's unknown.
false, if it's not provided.