webpack 升级Getting error: configuration.resolve.extensions[0] should not be empty

webpack 升级后，extensions 数组中不能使用空字符串，需要使用* 代替。
否则报错

Getting error: configuration.resolve.extensions[0] should not be empty 

参考文档：https://github.com/webpack/webpack/issues/3043

I am not sure that this is correct but after a series of trial an error I have tried using the * symbol instead of an empty string. This seems to have fixed the problem.So final syntax for the extensions attribute:

extensions: [‘*’, ‘js’, ‘ts’]

Hope this is the intended way to do it
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