Deduplication for husky.add()

[SevenOutman]

It's a common use case that we use husky API to build something like a mrm task, e.g. mrm-task-lint-staged. The script adds npx lint-staged into pre-commit hook using husky.add() API. But if the script was run multiple times, there would also be multiple duplicated lines of npx lint-staged inside pre-commit script. I believe it would be really helpful if husky.add() supports deduplication.

Expected behavior

1. Avoid duplication in form of exact same line. For example, given .husky/pre-commit script as shown below:

#!/bin/sh
. "$(dirname "$0")/_/husky.sh"

npx lint-staged

Calling husky.add('.husky/pre-commit', 'npx lint-staged') should not take effect because there is already a line with exact same content.

2. Furthermore, avoid duplication in a sequence of commands. For example, given .husky/pre-commit script as shown below:

#!/bin/sh
. "$(dirname "$0")/_/husky.sh"

echo 'Haha' && npx lint-staged

Calling husky.add('.husky/pre-commit', 'npx lint-staged') should not take effect because there is already a line with the same command called in a sequence.

[typicode]

There may be some cases where people would really want to have two times the same command:

date
# some long command
date

I prefer to keep husky simple and not too smart about it. There's husky set ... (husky.set()) on the other side which completely replaces the hook.

If checking for duplication is really needed, I'd use an if and some regexp maybe before calling husky.add :)

[SevenOutman]

If checking for duplication is really needed, I'd use an if and some regexp maybe before calling husky.add :)

Then what about something like a husky.exists method? That way users don't have to read/write husky files with a single fs API.