# myutils.tcl
package provide ::myapp::utils 1.0

namespace eval ::myapp::utils {
  namespace export test
}

proc ::myapp::utils::test {value} {
  return $value
}

# mytest.tcl
package require ::myapp::utils 1.0

set x [::myapp::utils::test "A"]

puts $x

#pkgIndex.tcl
if {![package vsatisfies [package provide Tcl] 8.5]} {return}

package ifneeded ::myapp::utils 1.0 [list source [file join $dir myutils.tcl]