Use instanceof to distinguish between blocks and workspaces.
Use instanceof to distinguish between blocks and workspaces.

google/blockly,lzairdking/blockly,daarond/blockly,google/blockly-devtools,trinketapp/blockly,markocelan/blockly-minecraft,InspectorWidget/blockly,rachel-fenichel/blockly,lzairdking/blockly,gengshenghong/scratch-blocks,LLK/scratch-blocks,mark-friedman/blockly,markocelan/blockly-minecraft,jstnhuang/blockly,gengshenghong/scratch-blocks,joshlory/blockly,joshlory/blockly,nickmain/blockly,picklesrus/blockly,jstnhuang/blockly,twodee/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,aravart/speech-blocks,twodee/blockly,jano42/blockly,InspectorWidget/blockly,lzairdking/blockly,groklearning/blockly,picklesrus/blockly,LLK/scratch-blocks,rachel-fenichel/blockly,trinketapp/blockly,sclements/scratch-blocks,hkoi/blockly,hkoi/blockly,twodee/blockly,trinketapp/blockly,gengshenghong/scratch-blocks,twodee/blockly,jstnhuang/blockly,trinketapp/blockly,rachel-fenichel/blockly,jstnhuang/blockly,trodi/blockly,trodi/blockly,InspectorWidget/blockly,griffpatch/scratch-blocks,google/blockly,mark-friedman/blockly,markocelan/blockly-minecraft,griffpatch/scratch-blocks,carlosperate/blockly,rachel-fenichel/blockly,picklesrus/blockly,dhalupa/blockly,mark-friedman/blockly,carlosperate/blockly,sclements/scratch-blocks,daarond/blockly,google/blockly,groklearning/blockly,griffpatch/scratch-blocks,dhalupa/blockly,dhalupa/blockly,mark-friedman/blockly,nickmain/blockly,daarond/blockly,sclements/scratch-blocks,aravart/speech-blocks,google/blockly,google/blockly,hkoi/blockly,nickmain/blockly,trodi/blockly,sclements/scratch-blocks,LLK/scratch-blocks,griffpatch/scratch-blocks,mark-friedman/blockly,LLK/scratch-blocks,mark-friedman/blockly,rachel-fenichel/blockly,groklearning/blockly,sclements/scratch-blocks,carlosperate/blockly,jano42/blockly,lzairdking/blockly,nickmain/blockly,markocelan/blockly-minecraft,griffpatch/scratch-blocks,google/blockly,google/blockly-devtools,carlosperate/blockly,gengshenghong/scratch-blocks,gengshenghong/scratch-blocks,nickmain/blockly,LLK/scratch-blocks,trodi/blockly,twodee/blockly,google/blockly,groklearning/blockly,twodee/blockly,jano42/blockly,nickmain/blockly,joshlory/blockly,jano42/blockly