Support ESModules for proxy.config file

[ranwahle]

🚀 Feature request

Command (mark with an x)

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Description

Angular CLI now supports proxy configuration for both .json and .js extensions, however, trying to have a proxy with .mjs file, in order to have the javascript file importing other modules, produces an error message.

A clear and concise description of the problem or missing capability...

Describe the solution you'd like

I've discovered that using dynamic import instead of require on addProxyConfig function on dev-server.ts file, does this work.

If you have a solution in mind, please describe it.

Describe alternatives you've considered

I have searched for some flags that will allow me to do so and haven't found any, and the only solution I can find is to go to require.

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