nextflow MWE 2177

main.nf

nextflow.enable.dsl=2

process foo {
    publishDir "output"

    input:
    val(prefix)

    output:
    path "${prefix}_foo"
    path "${prefix}_foo/bar.txt"

    stub:
    """
    mkdir -p ${prefix}_foo
    echo "contents" >> ${prefix}_foo/bar.txt
    """
}

workflow foowf {
    take:
    prefix

    main:
    foo(prefix)
}

workflow {
    ip = Channel.fromList([1,2,3,4,5,6,7,8,9,10])
    foowf(ip)
}