How to use the scratch-vm/src/extension-support/block-type.CONDITIONAL function in scratch-vm

domToMutation: function (xmlElement) {
        const blockInfoText = xmlElement.getAttribute('blockInfo');
        if (!blockInfoText) return;
        if (!this.needsBlockInfoUpdate) {
            throw new Error('Attempted to update block info twice');
        }
        delete this.needsBlockInfoUpdate;
        this.blockInfoText = blockInfoText;
        const blockInfo = JSON.parse(blockInfoText);

        switch (blockInfo.blockType) {
        case BlockType.COMMAND:
        case BlockType.CONDITIONAL:
        case BlockType.LOOP:
            this.setOutputShape(ScratchBlocks.OUTPUT_SHAPE_SQUARE);
            this.setPreviousStatement(true);
            this.setNextStatement(!blockInfo.isTerminal);
            break;
        case BlockType.REPORTER:
            this.setOutput(true);
            this.setOutputShape(ScratchBlocks.OUTPUT_SHAPE_ROUND);
            if (!blockInfo.disableMonitor) {
                this.setCheckboxInFlyout(true);
            }
            break;
        case BlockType.BOOLEAN:
            this.setOutput(true);
            this.setOutputShape(ScratchBlocks.OUTPUT_SHAPE_HEXAGONAL);
            break;