Neural Prediction Model


    0.2.52 • Public • Published

    chpoom (chpm)

    A CLI tool to run npm scripts with your prefered package manager, as npm, yarn, ied, pnpm or anything configured in the chpoom config. Useful for setups where some team members use npm while others use yarn, especially when Windows and Unix-like systems are used across the team.

    I'm yarpm's little sibling !

    This tool is an experiment over yarpm, which is well maintained and should probably considered, depending on your needs.

    The difference is that chpm has no cli tool for choosing yarn. Instead, if you use chpm directly for command line, the script will look into configuration for an array of prefered packages manager. The first that exist will be used.

    This tool is a helper to run scripts from package.json. Just substitute all npm or yarn calls with chpm and you're good to go:

      "scripts": {
        "start": "chpm run build",
        "build": "tsc index.ts"

    What this tool is not

    This tool is not meant to be an abstraction layer for calling npm or yarn. It will pass all arguments it receives unfiltered to the chosen package manager. So you could create the following package.json and pass the -s flag to chpm to silence npm output:

      "scripts": {
        "start": "chpm run -s build",
        "build": "tsc index.ts"

    This will work if you invoke the script with npm start. Running the script with yarn start will result in the following error:

    yarn run v0.21.3
    error No command specified.

    This is due to the fact that yarn doesn't understand the -s option. This is up to you to write your scripts so that only commands and options available to both npm and yarn are used.


    $ npm install chpm --save-dev
    # or 
    $ yarn add chpm --dev

    CLI Command

    chpm is an in-place substitute for places in package.json where npm or yarn is being used explicitly. It reads the npm_execpath environment variable to determine the path to the currently used package manager. This env var is only set when running chpm as a script. If chpm is used without being embedded in a script, it will first look into the chpoom config or fallback to npm.

    For specifiying your package manager in command line not in the npm environnement, you need either to install chpm globally with npm i -G chpm or with what is you prefered package manager. I personnaly use pnpm.

    The you can just $ chpm install & chpm run anything and it will use your workspace configuration.

    From here, you can just use chpm everywhere you would have use npm in your package.json.

    chpoom config

    This file is there to specify your prefered packages managers, if chpm can't determine if one is already in use. It's just an array of string.

    The configuration is read by cosmiconfig so you can either use an array in package.json as :


    or you can put a file in your workspace :

    • .chpmrc
    • .chpmrc.json
    • .chpmrc.yaml
    • .chpmrc.yml
    • .chpmrc.js
    • chpm.config.js

    Node API

    The chpm package provides a node API.

    const chpm = require('chpm');
    const promise = chpm(argv, options);
    • argv string[] -- The argument list to pass to npm/yarn.
    • options object|undefined
      • options.npmPath string - The path to npm/yarn. Default is process.env.npm_execpath if set, npm otherwise.
      • options.env object - Sets the environment key-value pairs, replaces the default usage of process.env to spawn child process.
      • options.stdin stream.Readable|null -- A readable stream to send messages to stdin of child process. If this is null or undefined, ignores it. If this is process.stdin, inherits it. Otherwise, makes a pipe. Default is null. Set to process.stdin in order to send from stdin.
      • options.stdout stream.Writable|null -- A writable stream to receive messages from stdout of child process. If this is null or undefined, cannot send. If this is process.stdout, inherits it. Otherwise, makes a pipe. Default is null. Set to process.stdout in order to print to stdout.
      • options.stderr stream.Writable|null -- A writable stream to receive messages from stderr of child process. If this is null or undefined, cannot send. If this is process.stderr, inherits it. Otherwise, makes a pipe. Default is null. Set to process.stderr in order to print to stderr.

    chpm returns a promise will be resolved when the spawned process exits, regardless of the exit code. The promise will be rejected in case of an internal error inside of chpm.

    The promise is resolved with an object with the following 2 properties: spawnArgs and code. The spawnArgs property contains the array of parameters that were passed to spawn the sub-process. The code property is the exit code of the sub-process.

    chpm(['install']).then(result => {
      console.log(`${result.spawnArgs} -- ${result.code}`);
      // if executed as a package.json script via yarn: /usr/share/yarn/bin/yarn.js,install -- 0



    Thank you for contributing!

    Bug Reports or Feature Requests

    Please use GitHub Issues.




    npm i chpm

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