minecraft-java-manager/src/checker.js

const childProcess = require("node:child_process")

function getJavaVersionOutput(defaultCommand = "java") {
    try {
        const command = childProcess.spawnSync(defaultCommand, ["-version"], {
            encoding: "utf-8",
            windowsHide: true,
        })

        if (command.error) {
            return null
        }

        return command.stderr || command.stdout || ""
    } catch {
        return null
    }
}

function parseJavaOutput(output) {
    if (!output || typeof output !== "string") {
        return null
    }
    
    const match = output.match(/version\s+"(?:1\.)?(\d+)/i)
    return match ? parseInt(match[1], 10) : null
}

function isJavaCompatible(output, requiredMajor) {
    return parseJavaOutput(output) === requiredMajor
}

module.exports = {
    getJavaVersionOutput,
    isJavaCompatible,
    parseJavaOutput,
}