在Angular6项目中ng-alain自定义图表中g2-custom使用G2库时编译错误

[TerryCan]

• [ ] I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

https://ng-alain.com/chart/custom/zh

Steps to reproduce

[图片]

Environment	Info
g2	4.1.1
System	macOS 10.15.7
Browser	chrome版本 86.0.4240.198（正式版本）

[hustcc]

看起来是 gl-matrix 三方库的类型定义问题。