node_modules/node-blockly/blockly/msg/json/constants.json

{"MATH_HUE": "230", "LOOPS_HUE": "120", "LISTS_HUE": "260", "LOGIC_HUE": "210", "VARIABLES_HUE": "330", "TEXTS_HUE": "160", "PROCEDURES_HUE": "290", "COLOUR_HUE": "20", "VARIABLES_DYNAMIC_HUE": "310"}