checkNodeVersion.js

/* eslint-disable no-console */
const fs = require('fs');
const semver = require('semver');
const childProcess = require('child_process');

// checks that current node and npm versions satisfies requirements in package.json
// to run manually:   node check-version.js [verbose]

const VERBOSE_FORCED = false;
const args = process.argv.slice(2);
const VERBOSE = VERBOSE_FORCED || (args.length > 0 && args[0] === 'verbose');

const printErrAndExit = (x) => {
    console.error(x);
    console.error('Aborting');
    process.exit(1);
};

const checkNpmVersion = (npmVersionRequired) => {
    if (!npmVersionRequired) {
        console.log('No required npm version specified');
        return;
    }
    const npmVersion = `${childProcess.execSync('npm -v')}`.trim();
    if (VERBOSE) console.log(`npm required: '${npmVersionRequired}' - current: '${npmVersion}'`);
    if (!semver.satisfies(npmVersion, npmVersionRequired)) {
        printErrAndExit(`Required npm version '${npmVersionRequired}' not satisfied. Current: '${npmVersion}'.`);
    }
};

const checkNodeVersion = (nodeVersionRequired) => {
    if (!nodeVersionRequired) {
        console.log('No required node version specified');
        return;
    }
    const nodeVersion = process.version;
    if (VERBOSE) console.log(`node required: '${nodeVersionRequired}' - current: '${nodeVersion}'`);
    if (!semver.satisfies(nodeVersion, nodeVersionRequired)) {
        printErrAndExit(`Required node version '${nodeVersionRequired}' not satisfied. Current: '${nodeVersion}'.`);
    }
};

const json = JSON.parse(fs.readFileSync('./package.json'));
if (!json.engines) printErrAndExit('no engines entry in package json?');
checkNodeVersion(json.engines.node);
checkNpmVersion(json.engines.npm);