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Node script to check npm version of package (expects piped in versions from npm)
'use strict';
const version = process.argv[2];
// Simple script to exit non-zero if the given version
// usage: npm view [package] versions | node vcheck [version]
// eg: npm view synthetix versions | node vcheck 2.4.1
.on('data', function(data) {
const versions = JSON.parse(data.replace(/'/g, '"'));
if (versions.indexOf(version) >= 0) {
process.stdout.write(`${version} already published.\n`);
process.exitCode = 1;
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