[BUG] postinstall not exec when run npm install xxx, but npm install do

[zitup]

Current Behavior:

postinstall don't exec when run npm install xxx, but just run npm install trigger execution
AND, script in node_modules/.hooks/postinstall will exec both in npm install xxx and npm install

Expected Behavior:

postinstall exec too when run npm install xxx

Steps To Reproduce:

package.json

 "scripts": {
    "postinstall": "node script.js"
  },

script

#!/usr/bin/env node

console.log("postinstall...");

console.log("    " + process.env.npm_package_name);

console.log("    " + process.env.PWD);

Environment:

• OS: macOS 10.15.5
• Node: 12.15.0
• npm: 6.13.4

[zitup]

Nobody answered, closed.

[karlhorky]

I think this is known behavior for the npm CLI: https://npm.community/t/preinstall-npm-hook-doesnt-execute-when-installing-a-specific-package/2505

Yarn does run the postinstall after every install (which seems like the better option).

[zitup]

YES, yarn does well, I would love to see npm upgrade :)

And FYI @karlhorky , I discovered this problem when i was developing a module like typesync, but npm's problems stuck me

I mentioned above is one of these, another one is when you install two package use npm install xxx1 xxx2, script in ./hooks/postinstall will only process one, so strange...

In addition, i use exec('npm install @types/xxx') to install types package, but don't know why it executes very slowly, maybe add @types/xxx to package.json and exec npm install is a good idea.

And,

in npm v6, a postinstall hook script, for example, runs once for every package that has been installed. So this means that with a node_modules/.hooks/postinstall script, if you run npm install with your package.json containing 20 dependencies, this script will run at least 20 times, and even more if those dependencies specify transitive dependencies...

It's true...