npm test "Error: Cannot find module" solution - this shell script installs all missing npm packages

npm depedencies

#!/bin/sh
# npm test wouldn't run due to missing or unresolved packages.
# This script installs all missing packages from error messages.

# Fix missing packages
missing_package="$(
    npm test 2>&1 |
    grep 'Cannot find module' |
    cut -d\' -f2)"
while [ -n "${missing_package}" ] ; do         # while missing packages
    echo "[+] installing ${missing_package}"   # report what is installing
    npm install "${missing_package}"           # install the package
    missing_package="$(                        # update missing_package for loop
        npm test 2>&1 |
        grep 'Cannot find module' |
        cut -d\' -f2)"
done

# Fix unresolved packages
missing_package="$(
    npm test 2>&1 |
    grep "Can't resolve" |
    cut -d\' -f3)"
while [ -n "${missing_package}" ] ; do         # while missing packages
    echo "[+] installing ${missing_package}"   # report what is installing
    npm install "${missing_package}"           # install the package
    missing_package="$(                        # update missing_package for loop
        npm test 2>&1 |
        grep "Can't resolve" |
        cut -d\' -f3)"
done