After compare all file in node-module/fabric and my custom build. and I got that both are same. So I put this answer for help.
Step :

1. install letest fabric js using cmd : npm install fabric --save
2. download custom build from fabric js site : http://fabricjs.com/build/
3. open : ionic-project-folder/node modules/fabric/
4. replace dist folder Placed inside above path with downloaded custom build (dist folder)
5. re-serve project.
   If any other solution is possible (like publishing into npm and install) then Please mention.

这是一个指向Ionic的API的链接，用于与Crashlytics工具包交互：https://ionicframework.com/docs/v3/native/crashlytics/。这应该有让你的离子应用程序与Crashlytics集成所需的说明。

通过npm安装

npm i fabric

更多详细信息请访问
https://www.npmjs.com/package/fabric

对于我的情况，我使用一个自定义构建结构js版本5.2.4和一个Ionic 6应用程序。
1.如果使用npm uninstall fabric将fabric js安装在项目中，请卸载它
1.从Fabric js站点下载您的自定义构建：http://fabricjs.com/build/
1.将下载的文件添加到public目录下，例如public/libs/fabric/fabric.min.js
1.在App.js处

useEffect(() => {
        const script = document.createElement('script');
        // You may have to replace this code with your path.
        script.src = "libs/fabric/fabric.min.js";
        script.async = true;
        document.body.appendChild(script);
        return () => {
            document.body.removeChild(script);
        }
    }, []);

1.重新服务项目。
1.现在fabric应该可以从window.fabric获得
注意。
编辑器还添加了一些代码到我的tsconfig.json

"include": [
    "src",
    "public/libs" // This code
  ]

我不知道它是做什么的，但它工作正常，所以我离开了它。