Baileys/src/WABinary/JidUtils.ts

export const S_WHATSAPP_NET = '@s.whatsapp.net'
export const OFFICIAL_BIZ_JID = '16505361212@c.us'
export const SERVER_JID = 'server@c.us'
export const PSA_WID = '0@c.us';
export const STORIES_JID = 'status@broadcast'

export type JidServer = 'c.us' | 'g.us' | 'broadcast' | 's.whatsapp.net' | 'call'

export const jidEncode = (user: string | number | null, server: JidServer, device?: number, agent?: number) => {
    return `${user || ''}${!!agent ? `_${agent}` : ''}${!!device ? `:${device}` : ''}@${server}`
}

export const jidDecode = (jid: string) => {
    let sepIdx = typeof jid === 'string' ? jid.indexOf('@') : -1
    if(sepIdx < 0) {
        return undefined
    }
    const server = jid.slice(sepIdx+1)
    const userCombined = jid.slice(0, sepIdx)

    const [userAgent, device] = userCombined.split(':')
    const [user, agent] = userAgent.split('_')

    return {
        server,
        user,
        agent: agent ? +agent : undefined,
        device: device ? +device : undefined
    }
}
/** is the jid a user */
export const areJidsSameUser = (jid1: string, jid2: string) => (
    jidDecode(jid1)?.user === jidDecode(jid2)?.user
)
/** is the jid a user */
export const isJidUser = (jid: string) => (jid?.endsWith('@s.whatsapp.net'))
/** is the jid a broadcast */
export const isJidBroadcast = (jid: string) => (jid?.endsWith('@broadcast'))
/** is the jid a broadcast */
export const isJidGroup = (jid: string) => (jid?.endsWith('@g.us'))
/** is the jid the status broadcast */
export const isJidStatusBroadcast = (jid: string) => jid === 'status@broadcast'

export const jidNormalizedUser = (jid: string) => {
    const { user, server } = jidDecode(jid)
    return jidEncode(user, server === 'c.us' ? 's.whatsapp.net' : server as JidServer)
}