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        eh = exthelper.exthelper()

        # As needed (failure to do this will mean your registration will not
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        configtable = eh.configtable
        filesetpredicate = eh.filesetpredicate
        revsetpredicate = eh.revsetpredicate
        templatekeyword = eh.templatekeyword

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        uisetup = eh.finaluisetup
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        reposetup = eh.finalreposetup
        uipopulate = eh.finaluipopulate

        @eh.command(b'mynewcommand',
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        def newcommand(ui, repo, *revs, **opts):
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        @eh.filesetpredicate(b'lfs()')
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        @eh.revsetpredicate(b'hidden')
        def revsetbabar(repo, subset, x):
            args = revset.getargs(x, 0, 0, b'babar accept no argument')
            return [r for r in subset if b'babar' in repo[r].description()]

        @eh.templatekeyword(b'babar')
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                ui.note(b'Barry!')
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            uisetup = eh.finaluisetup

            @eh.wrapfunction(discovery, b'checkheads')
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