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Just started learning React js and then I found this enterprise-level react application framework called Umi. Since I am just a beginner with Node js too, I am having a hard time understanding what really happened after I typed 'umi dev' in the command line.

I spent some time digging into the source code. My current guess is that somehow umi used another js library called 'webpack-dev-server' to actually run an express server locally. However, I am still confused on how the 'umi dev' command makes all these things happen. Is 'dev' a command? Or is it a class? What should people do if they want a new command like 'umi my-own-command'?

P Varga
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NJUHOBBY
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  • This seems to be only the 2nd question here about UmiJS, so I think you're unlikely to get an answer. It's worth asking in Umi's support channels directly – P Varga May 04 '19 at 09:33
  • Anyhow, by running `which umi`, you will see the path for the `umi` script, likely it is a JavaScript script which parses its command-line options like "dev" and acts accordingly – P Varga May 04 '19 at 09:38

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umi is installed by yarn global add umi

i think, you can take a look about ~/.config/yarn/global/node_modules/umi
There's an introduction to umi

there is a file package.json
directorys lib, bin, scripts. and so on

i hope this helps you

zichen0422
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