export function from zsh to bash for use in gnu parallel

Based on that other guy's answer. You can write a function that export a zsh function that already defined to bash

function exportf (){
    export $(echo $1)="`whence -f $1 | sed -e "s/$1 //" `"
}

Usage

function my_func(){
    echo $1;
    echo "hello";
}

exportf my_func
parallel "my_func {}" :::  1 2

zsh does not have a concept of exporting functions. export -f somefunc will print the function definition, it will not export a function.

Instead, you can rely on the fact that bash functions are exported as regular variables starting with ():

export my_func='() { echo "$1"; }'
parallel --gnu "my_func {}" ::: 1 2

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