I have created my own custom blocks using Block factory. Now I need to restrict the connections between certain custom blocks. How do I achieve it?

Thanks in advance.

See this documentation: https://developers.google.com/blockly/custom-blocks/type-checks

And this thread: https://groups.google.com/forum/#!searchin/blockly/type/blockly/7eu9pFl_z9Q/chiJozu8hm4J Or: https://groups.google.com/forum/#!topic/blockly/-DpcBDPTc6U