(CommandList
  children: [
    (C {(set)} {(-e)})
    (Assignment
      keyword: Assign_None
      pairs: [
        (assign_pair
          lhs: (LhsName name:JS_DIR spids:[58])
          op: Equal
          rhs: {(${ VSub_Name TRAVIS_BUILD_DIR) (/js)}
          spids: [58]
        )
      ]
      spids: [58]
    )
    (C {(pushd)} {($ VSub_Name '$JS_DIR')})
    (C {(npm)} {(run)} {(validate)})
    (C {(popd)})
  ]
)