Why is Blockly not generating code for custom blocks?

Question

While generating code for custom blocks in blockly, i am getting error

Error: Language "Python" does not know how to generate  code for block type "import_block".

when logging in console.

Following is the code for block creation

Blockly.Blocks['import_block'] = {
      init: function() {
        this.appendDummyInput()
            .appendField("import")
            .appendField(new Blockly.FieldTextInput("default"), "import_name");   
        this.setOutput(true, null);
        this.setColour(230);
     this.setTooltip("");
     this.setHelpUrl("");
      }
    };

The code generation code is

    let code = (Blockly as any).Python.workspaceToCode(Blockly.mainWorkspace);
    console.log(code);

The block is visible in UI. Also the code gets generated for default blocks present in blockly but shows error for custom blocks.

Can anyone help me with this

Answer 1

Since you didn't show the code you wrote for actually transforming your block into code I can only assume that it's missing. Usually you'd do something like

Blockly.Python["import_block"] = function (block) {
    return "<your code>";
}

Have a look at the official docs!