What is the problem with webpack packaging?

enter webpack runoob1.js bundle.js Packaging Command prompt

E:\Smallcase>webpack runoob1.js bundle.js
 command: The input provided did not match any known commands or existing files:
            runoob1.js bundle.js

how should I modify it?
directory structure

Aug.03,2021

if wepack is installed in the global environment, the source file path is correct

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