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How to use the prerelease function from semver

Find comprehensive JavaScript semver.prerelease code examples handpicked from public code repositorys.

semver.prerelease is a function in the semver library that returns an array of prerelease components from a version string, if any.

releases.js

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// Include prelease versions, like v1.0.0-rc1 or v1.0.1-dev
if (versionConstraint == 'next') {
  version = releaseVersions[0]
} else if (versionConstraint == 'latest') {
  version = releaseVersions.filter(version => {
    const prereleaseComponents = semver.prerelease(version);
    return prereleaseComponents == null || prereleaseComponents.length == 0
  })[0];
} else if (validVersionConstraint) {
  version = matchVersion(releaseVersions, validVersionConstraint, false);

index.js

GitHub: PalaDrill-Staff/PalaDrill-Launcher

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            event.sender.send('autoUpdateNotification', 'realerror', err)
        })
    break
case 'allowPrereleaseChange':
    if(!data){
        const preRelComp = semver.prerelease(app.getVersion())
        if(preRelComp != null && preRelComp.length > 0){
            autoUpdater.allowPrerelease = true
        } else {
            autoUpdater.allowPrerelease = data

+ 20 other calls in file

How does semver.prerelease work?

semver.prerelease is a function provided by the semver library that allows you to extract the prerelease components from a version string. To use semver.prerelease, you pass in a version string as an argument. The function returns an array containing the prerelease components of the version string, if any. Prerelease components are any additional labels added to a version number beyond the main version number, separated by a hyphen (-). For example, in the version string "1.2.3-beta.1", "beta" and "1" are the prerelease components. If the version string does not contain any prerelease components, semver.prerelease returns null. semver.prerelease is one of many functions provided by the semver library that simplify working with version numbers in JavaScript. It is particularly useful when you need to parse or manipulate version strings that contain prerelease components.

settings.js

GitHub: TGS-Network/TGSLauncher

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 * 
 * @param {string} version The semver version to test.
 * @returns {boolean} True if the version is a prerelease, otherwise false.
 */
function isPrerelease(version){
    const preRelComp = semver.prerelease(version)
    return preRelComp != null && preRelComp.length > 0
}


/**

prepare-release.js

GitHub: bensing-io/bensing-io-portal

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let targetVersion = patchVersion;

// If we're currently in a pre-release we need to manually execute the
// patch bump up to the next version. And we also need to make sure we
// resume the releases at the same pre-release tag.
const currentPrerelease = semver.prerelease(pkg.packageJson.version);
if (currentPrerelease) {
  const parsed = semver.parse(targetVersion);
  parsed.inc('patch');
  parsed.prerelease = currentPrerelease;

Ai Example

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const semver = require("semver");

const versionString = "1.2.3-beta.1";

const prerelease = semver.prerelease(versionString);

console.log(prerelease);

In this example, we first import the semver library and define a version string that contains a prerelease component. We then use semver.prerelease to extract the prerelease components from the version string. The resulting prerelease variable contains an array with the two prerelease components "beta" and "1". Finally, we log the prerelease variable to the console using console.log. When you run this code, you should see an array containing the prerelease components "beta" and "1" logged to the console. This example demonstrates how you can use semver.prerelease to extract the prerelease components from a version string.

semver-intersect.js

GitHub: SumeetOutlook/sumeet-practice

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}


function parseRange(range) {
    var condition = regex.condition.exec(range)[1] || '=';
    var version = regex.version.exec(range)[1];
    var prerelease = semver.prerelease(version);
    return { condition, prerelease, version };
}


function union(a, b) {

release-notes.js

GitHub: Chloedev5/atom-reborn

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  return undefined;
}


function getPreviousRelease(version, allReleases) {
  const versionIsStable = semver.prerelease(version) === null;


  // Make sure versions are sorted before using them
  allReleases.sort((v1, v2) => semver.rcompare(v1.name, v2.name));

utils.js

GitHub: vp2305/AxiomWallet

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 */
function getBrowserVersionMap(platforms, version) {
  const major = semver.major(version);
  const minor = semver.minor(version);
  const patch = semver.patch(version);
  const prerelease = semver.prerelease(version);
  let buildType, buildVersionSummary, buildVersion;
  if (prerelease) {
    [buildType, buildVersionSummary] = prerelease;
    // The version could be version: '10.25.0-beta.1-flask.0',

release-notes.js

GitHub: nhatpham0301/vietmap-ios-sdk

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if (outputMode.isGitHub) {
    templatedReleaseNotes = ejs.render(fs.readFileSync('platform/macos/scripts/release-notes-github.md.ejs', 'utf8'), {
        'CURRENTVERSION': currentVersion,
        'PREVIOUSVERSION': previousVersion,
        'CHANGELOG': currentReleaseNotes.changelog,
        'isPrerelease': semver.prerelease(currentVersion)
    });
}


if (outputMode.isJazzy) {

utils.js

GitHub: microsoft/fluentui

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  acc[cur.packageJson.name] = { replace: cur.packageJson.name };
  return acc;
}

if (isConvergedPackage({ packagePathOrJson: cur.packageJson, projectType: 'library' })) {
  const isPrerelease = semver.prerelease(cur.packageJson.version) !== null;

  acc[cur.packageJson.name] = isPrerelease
    ? { replace: '@fluentui/react-components/unstable' }
    : { replace: '@fluentui/react-components' };

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