preProcessing method
Implementation
Future<void> preProcessing(double contextId, {bool isModule = false}) async {
if (isJavascript && data != null && isPageAlive(contextId)) {
assert(isValidUTF8String(data!), 'JavaScript code is not UTF-8 encoded.');
data = await dumpQuickjsByteCode(contextId, data!, url: _uri.toString(), isModule: isModule);
_contentType = webfBc1ContentType;
}
}