Bash: Export Environment Variable from Script file and Discoverable by Node process.env

Question

Goal: Set Environment variable from Bash script file and discoverable via Node process.env

Following effort works from macOS console, as would be expected:

I have created the following typescript file process.env.ts that outputs to console environment variable TEST_ENV_VALUE:

declare let process: {
    env: {
        TEST_ENV_VALUE: string;
    };
};

console.log('process.env.TEST_ENV_VALUE', process.env.TEST_ENV_VALUE);

package.json script contains:

  "scripts": {
    "test:process": "ts-node test/process.env.ts"
  },

When I perform the following directly within macOS console, environment variable TEST_ENV_VALUE is discoverable by process.env.ts:

$ unset TEST_ENV_VALUE
$ export TEST_ENV_VALUE="FOO"
$ echo $TEST_ENV_VALUE
FOO
$ npm run test:process
> ts-node test/process.env.ts

process.env.TEST_ENV_VALUE FOO

Success shows that process.env.TEST_ENV_VALUE returns value of FOO.

Attempt creating Bash Script File with same console script

The following bash script file set_env_variable.sh is attempting to replicate what was able to be performed within macOS console:

#!/usr/bin/env bash

USAGE="\nUsage: $0\n
[-h|--help]\n
--value\n
"

usage() { echo -e ${USAGE} 1>&2; exit 1; }

# read the options
OPTS=`getopt -o h --long help,value: -n 'set_env_variable.sh' -- "$@"`
if [ $? != 0 ] ; then echo "Failed parsing options." >&2 ; usage ; exit 1 ; fi
eval set -- "$OPTS"

HELP=false
TEST_ENV_VALUE="TEST"

while true; do
  case "$1" in
    -h | --help )       usage ;;
    --value )           TEST_ENV_VALUE="$2" ; shift; shift ;;
    -- )                shift; break ;;
    * )                 break ;;
  esac
done

echo -e '\n-------------------------\n'
echo TEST_ENV_VALUE="${TEST_ENV_VALUE}"
echo -e '\n-------------------------\n'
unset TEST_ENV_VALUE
export TEST_ENV_VALUE="${TEST_ENV_VALUE}"

npm run test:process

However, when set_env_variable.sh executed, environment variable TEST_ENV_VALUE is not discoverable by process.env.ts:

$ unset TEST_ENV_VALUE
$ ./set_env_variable.sh --value "BAR"
-------------------------
TEST_ENV_VALUE=BAR
-------------------------
> [email protected] test:process /Users/jeffrey.tanner/github/ACT/act-qa
> ts-node test/process.env.ts

process.env.TEST_ENV_VALUE

In other words, process.env.TEST_ENV_VALUE returns undefined.

Assistance appreciated in creating a bash script that will export an environment variable that is discoverable by node process.env. Thank you

What happens when you run the script as #!/bin/bash as opposed to /usr/bin/env? — Raman Sailopal
– Raman Sailopal, Commented Dec 14, 2020 at 21:15
@RamanSailopal Thank you for your reply. Good idea. Same results. process.env.TEST_ENV_VALUE returns undefined — Jeff
– Jeff, Commented Dec 15, 2020 at 13:32

Kurtis Rader · Accepted Answer · 2020-12-15 18:22:15Z

1

Why are you unsetting the variable then exporting it again?

unset TEST_ENV_VALUE
export TEST_ENV_VALUE="${TEST_ENV_VALUE}"

That, by definition, is exporting an empty string. Remove those two lines and replace

TEST_ENV_VALUE="TEST"

with

export TEST_ENV_VALUE="TEST"

answered Dec 15, 2020 at 18:22

Kurtis Rader

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Jeff · Accepted Answer · 2020-12-31 01:07:50Z

0

@KurisRader

I reworked based on your suggestion:

HELP=false
VALUE=""

while true; do
  case "$1" in
    -h | --help )       usage ;;
    --value )           VALUE="$2" ; shift; shift ;;
    -- )                shift; break ;;
    * )                 break ;;
  esac
done

echo -e '\n-------------------------\n'
echo TEST_ENV_VALUE="${VALUE}"
echo -e '\n-------------------------\n'

unset TEST_ENV_VALUE
export TEST_ENV_VALUE="${VALUE}"

answered Dec 31, 2020 at 1:07

Jeff

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