How to compile pipeline steps as regular groovy file???

[TInaTinaTian L]

When invoked from Jenkinsfile, pipeline steps work fine and all. But when I want to compile a library with pipeline steps, compilation fails.

package com.company;

def read(fileName) {
  return libraryResource(fileName)
}

return this

 How to compile the above code as regular .groovy code?

Which packages do I have to import???

Which classes do I have to mixin???

Which class does the "libraryResource()" method come from???

Thanks!