forced require of non-existant buffer

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.8.0
• Cross-platform modules: 6.5.15
• Android Runtime: 6.5.3
• iOS Runtime: 6.5.2

Describe the bug
After updating the node_modules in my project including js-base64, starting the app resulted in an exception on trying to require the module buffer, which was never anywhere explicitly required.

According to the author (https://github.com/dankogai/js-base64/issues/126#issuecomment-674838031) the new version does check for existence of the Buffer object to maybe use it if available.

Expected behavior

Either do not add the require('buffer') or add buffer to the dependencies if not already there.

首先，使用列出的 NativeScript 版本复现应用启动，并检查从 js-base64 到不可用的 buffer 模块的依赖路径。检查 CLI 的依赖声明和启动处理；当应用不再尝试执行不可用的 require 时即完成，无论是因为依赖可用，还是因为没有引入 require。