How to run a postinstall script after

Question

I am migrating from yarn version 1.22 to yarn v3.2.3. I have a prepare script that was running automatically after install.

My prepare script generates some files (FIY Nuxt 3 generated files).

It does not run anymore on yarn 3, and how can I get the same effect? I don't find it on https://yarnpkg.com/advanced/lifecycle-scripts. Maybe I am misreading.

Deberadeberry

Did you ever resolve this? I'm running into the same issue. – Ruscher

@Ruscher I posted it – Deberadeberry

Answer 1

I have finally found a solution:

1. Install the Yarn plugin after install: yarn plugin import https://raw.githubusercontent.com/mhassan1/yarn-plugin-after-install/v0.3.1/bundles/@yarnpkg/plugin-after-install.js.

• See the command in the README to get the latest version.

2. In a .yarnrc.yml at the root of your project, add your command: afterInstall: <your-command>

Deberadeberry

is there anything similar for pre-install? – Dismissive

@AkshayGundewar I found a way to essentially add a preinstall script: Simply create an empty NodeJS script somewhere (no exports needed), then reference it in .yarnrc.yml as a plugin: plugins: [".yarn/plugins/preinstall.js"]. Then just put your preinstall logic in that js file. Yarn imports from this script (looking for a plugin configuration) early enough in the process that, eg. if you make changes to the package.json file, those changes are applied before yarn reads from it. (or at least before it does the contents read for then modifying the contents and re-saving it) – Seraphine

Oh, if you want to make sure the preinstall script only runs before an actual install, wrap your preinstall code in this if condition: if (process.argv[2] == "install" || process.argv[2] == null) { ... } – Seraphine