Read package version from yarn.lock

README.md

read-yarn-lock

Example:

> npx -q https://gist.github.com/viters/e31bbe6c842f178e6955cae1211e8953 yarn.lock prettier
[email protected]

May be used in scripts such as:

yarn global add $(npx -q https://gist.github.com/viters/e31bbe6c842f178e6955cae1211e8953 yarn.lock prettier)

I use it in CI environment in some jobs to install only portion of dependencies to quicken pipeline.

index.js

#!/usr/bin/env node

const fs = require('fs');
const lockfile = require('@yarnpkg/lockfile');

if (!process.argv[2]) {
  throw Error('Provide path to yarn.lock file');
}

if (!process.argv[3]) {
  throw Error('Provide package name');
}

const file = fs.readFileSync(process.argv[2], 'utf8');
const json = lockfile.parse(file);

const key = Object.keys(json.object).find(a => a.split('@')[0] === process.argv[3]);

if (!key) {
  throw Error(process.argv[3] + ' package not found');
}

console.log(process.argv[3] + '@' + json.object[key].version);

package.json

{
  "name": "read-yarn-lock",
  "version": "1.0.0",
  "description": "Parse yarn.lock and get currently used pkg version",
  "main": "index.js",
  "bin": "index.js",
  "author": "[email protected]",
  "license": "MIT",
  "dependencies": {
    "@yarnpkg/lockfile": "^1.1.0"
  }
}