Add bullet of text to Master

Hi, I want to add bullet of text to Master. but I can't change the fontsize, the word font size always 18. below is my code. please help me. My import js is: /PptxGenJS/libs/jquery.min.js /PptxGenJS/libs/jszip.min.js /PptxGenJS/libs/promise.min.js /PptxGenJS/dist/pptxgen.js /PptxGenJS/dist/pptxgen.shapes.js

-------- my code is below ------------

pptx.defineSlideMaster({
    title: 'MASTER_BACKUP',
    bkgd: 'FFFFFF',
    margin:  [ 0, 0, 0, 0 ],
    objects: [
                { 'text':  { text:
                            [
            { text:'Bullet one',     options:{ fontSize:24, bullet:true, color:'99ABCC'                } },
            { text:'Indent-Level 1', options:{ fontSize:32, bullet:true, color:'FFFF00', indentLevel:1 } },
            { text:'Indent-Level 2', options:{ fontSize:42, bullet:true, color:'0088CC', indentLevel:2 } },
            { text:'Indent-Level 3', options:{ fontSize:48, bullet:true, color:'CC88BB', indentLevel:3 } },
            { text:'Indent-Level 3', options:{ fontSize:48, bullet:true, color:'CC88BB', indentLevel:3 } },
            { text:'Indent-Level 2', options:{ fontSize:42, bullet:true, color:'0088CC', indentLevel:2 } },
            { text:'Indent-Level 2', options:{ fontSize:42, bullet:true, color:'0088CC', indentLevel:2 } },
            { text:'Indent-Level 1', options:{ fontSize:32, bullet:true, color:'FFFF00', indentLevel:1 } },
            { text:'Bullet no indent', options:{ fontSize:24, bullet:true, color:'99ABCC'                } },
            { text:'Bullet Last',    options:{ fontSize:24, bullet:true, color:'99ABCC'                } }
        ], 
                            options:{ x:0, y:0.5, w:'100%',h:6.0,fontFace:'Arial',fontSize:24}
                           } 
                }
            ]
});

该提问来源于开源项目：gitbrent/PptxGenJS