No way to opt out of post-install only

[dziamid]

While yarn install --ignore-scripts ignores post-install scripts, it also prevents the Building fresh packages... stage of the install.

How do I ignore post-install while keeping the building of fresh packages ?
Or how do I invoke building of fresh packages manually? I haven't found a command that does that.

[phra]

still no way to do that?

[twang2218]

I have the same issue here, my use case is for Dockerfile. Here is the Dockerfile:

FROM node:8 as builder

## Prepare dependencies
WORKDIR /app/
COPY package.json /app/
COPY yarn.lock /app/
RUN yarn --ignore-scripts

## Build
COPY . /app/
RUN yarn build

I want to install the dependencies as a layer, then build the package later as another layer, just followed the Dockerfile best practice. And I don't want to execute postinstall script in current package for the dependencies installation layer, but I definitely do not want to stop the dependencies building.

I tried --ignore-scripts as above, then all the dependencies building process are stopped as well.

For my case, I have pngquant-bin in my dependencies tree (not even in package.json of my package), and it has a postinstall script:

  "scripts": {
    "postinstall": "node lib/install.js",
    "test": "xo && mocha"
  },

So, what can I do if I just want to stop postinstall script defined in my package.json?

[anhkind]

Deleted!

[ipmb]

Here's a workaround:

  "postinstall": "test -n \"$NOYARNPOSTINSTALL\" || yarn run build"

You can now optionally prevent the postinstall script from running with:

$ NOYARNPOSTINSTALL=1 yarn install

[johannesjo]

No update on this? It has been over two years now...

[akoidan]

@ipmb so we drop cross-platform support? I guess windows-base OSes don't have test

[rajivshah3]

I needed a cross-platform way to do this as well, so I made skip-postinstall

{
    "scripts": {
        "postinstall": "skip-postinstall || node-gyp rebuild"
    }
}

SKIP_POSTINSTALL=1 yarn install

[merceyz]

If you want to run the postinstalls of dependencies but not your own you should just move that script out of your postinstall and invoke it manually whenever you need it to run

How do I ignore post-install while keeping the building of fresh packages ?

"Building fresh packages" is the postinstalls

---

Or how do I invoke building of fresh packages manually? I haven't found a command that does that.

Closing as fixed in v2 where you can run yarn install --mode skip-build then later do yarn rebuild to trigger them

https://yarnpkg.com/getting-started/migration
https://yarnpkg.com/cli/install#options-mode%20%230
https://yarnpkg.com/cli/rebuild

[leikoilja]

@merceyz, there is no even an option of skip-builds in the latest docs :/

[merceyz]

It was renamed to --mode skip-build, I've updated my comment

[oliverlockwood]

@rajivshah3 I've been making use of your lightweight skip-postinstall package for a few months now (very helpful, thanks!), but now I get warnings and https://www.npmjs.com/package/skip-postinstall says it's deprecated.
I raised issue rajivshah3/skip-postinstall#1 on your project. Are you planning to resolve this or are you considering the mini-project to be abandoned?

[cwtuan]

I want to disable a specific dependency's postinstall. Is that possible?

[devthejo]

Here is my workaround:
https://github.com/devthejo/yarn-plugin-fetch/tree/master#production

[andrew-aladjev]

From my point of view postinstall script will be launched 2 times: during yarn install in current project context and during yarn install in different context (dependency installation). So you have to somehow separate this 2 cases. Also you need to allow user to stop this script. So I've provided the following solution:

"postinstall-script": "sh -c 'if [ -f ./dist/postinstall.js ]; then node ./dist/postinstall.js; fi'",
"postinstall": "sh -c 'if [ ! \"$<PROJECT_NAME>_NO_POST_INSTALL\" ]; then yarn postinstall-script; fi'"

It depends on bash (or other shell), but today bash installation is not a big deal for Windows and OSX.

[leaftail1880]

Easiest cross-platform way:

"postinstall": "node -e \"process.env.NO_POSTINSTALL===1&&process.exit(1)\" || your-script"