getClassFieldValue function
Implementation
String getClassFieldValue(ClassElement clazz, FieldElement field) {
var session = field.session!;
ParsedLibraryResult parsedLibResult =
session.getParsedLibraryByElement(clazz.library) as ParsedLibraryResult;
ElementDeclarationResult declaration =
parsedLibResult.getElementDeclaration(field)!;
return declaration.node.toSource().split("=").last;
}