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# Migrate from v4
If you were calling `package.json` scripts using `npm` or `yarn`, **you can simply copy your commands** from your config file to the corresponding hook:
Husky v4
```json
// package.json
{
"hooks": {
"pre-commit": "npm test && npm run foo" // [!code hl]
}
}
```
Husky v9
```shell
# .husky/pre-commit
# Note that you can now have commands on multiple lines
npm test // [!code hl]
npm run foo // [!code hl]
```
If you were calling locally installed binaries, **you need to run them via your package manager now**:
::: code-group
```js [.huskyrc.json (v4)]
{
"hooks": {
"pre-commit": "jest"
}
}
```
```shell [.husky/pre-commit (v9)]
jest
```
:::
`HUSKY_GIT_PARAMS` environment variable is replaced now by native params `$1`, `$2`, etc.
::: code-group
```js [.huskyrc.json (v4)]
{
"hooks": {
"commit-msg": "commitlint -E HUSKY_GIT_PARAMS"
}
}
```
```shell [.husky/commit-msg (v9)]
commitlint --edit $1
```
:::
Other environment variables changes:
- `HUSKY_SKIP_HOOKS` is replaced by `HUSKY`.
- `HUSKY_SKIP_INSTALL` is replaced by `HUSKY`.
- `HUSKY_GIT_PARAMS` is removed. Instead Git parameters should be used directly in scripts (e.g. `$1`).
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