How can i use a pre-commit hook to exclude changes to a javascript file "cypress.config.js" that defines an object that has a key "env". Env must never define keys that aren't "environment"
You can use a pre-commit hook to exclude changes to the cypress.config.js file that defines an object with a key of "env". The hook can check the contents of the file and reject any changes that define keys that are not "environment".
How can i use a pre-commit hook to exclude changes to a javascript file "cypress.config.js" that defines an object that has a key "env". Env must never define keys that aren't "environment" or "baseUrl".

To achieve this, you can create a pre-commit Git hook using a script that checks the changes to the "cypress.config.js" file and ensures the "env" object only contains the allowed keys "environment" and "baseUrl". Here's an example using a bash script:

1. Navigate to the root directory of your repository.

2. Create a new file named `.git/hooks/pre-commit` (create the directories if they don't exist).

3. Open the pre-commit file in a text editor and paste the following content:

```bash
#!/bin/sh

# Skip if the cypress.config.js file is not modified
if git diff --cached --diff-filter=AM cypress.config.js | grep -q '^A cypress.config.js'; then
    exit 0
fi

# Check if the env object exists and only contains allowed keys
if grep -q 'env: {' cypress.config.js; then
    env_object=$(grep 'env:' cypress.config.js | sed 's/^.*env: {\(.*\)\}$/\1/')
    allowed_keys='environment baseUrl'

    for key in $allowed_keys; do
        if ! echo "$