@robot.com/better-mqtt/index.cjs.map

A modern, TypeScript-first MQTT client library that provides a better developer experience with async iterators, shared subscriptions, and React hooks. Better MQTT is a wrapper around the excellent [mqtt.js](https://github.com/mqttjs/MQTT.js) library, enh

{"version":3,"sources":["../src/index.ts","../src/match.ts","../src/subs-manager.ts","../src/subscription.ts","../src/generator.ts"],"sourcesContent":["/** biome-ignore-all lint/suspicious/noExplicitAny: I'm sure it is fine */\nimport { EventEmitter } from 'ee-ts'\nimport mqtt, {\n    type ErrorWithReasonCode,\n    type IClientOptions,\n    type MqttClient,\n} from 'mqtt'\nimport { SubscriptionManager } from './subs-manager'\nimport { Subscription } from './subscription'\nimport type { SubscriptionOptions } from './types'\n\nexport * from './subscription'\nexport * from './types'\n\nexport type ConnectArgs =\n    | [brokerUrl: string]\n    | [brokerUrl: string, opts?: IClientOptions]\n    | [opts: IClientOptions]\n\nexport interface BetterMQTTEvents {\n    status(status: 'online' | 'offline'): void\n    error(error: Error | ErrorWithReasonCode): void\n    end(): void\n}\n\nexport type MessageParser<T = string> = (message: Buffer) => T\n\nexport function stringParser(message: Buffer): string {\n    return message.toString('utf8')\n}\n\nexport function jsonParser<T = unknown>(message: Buffer): T {\n    return JSON.parse(message.toString('utf8'))\n}\n\nexport function binaryParser(message: Buffer): Buffer {\n    return message\n}\n\nexport class BetterMQTT extends EventEmitter<BetterMQTTEvents> {\n    readonly client: MqttClient\n    error: Error | ErrorWithReasonCode | null = null\n\n    get status() {\n        return this.client.connected ? 'online' : 'offline'\n    }\n\n    private subscriptions: SubscriptionManager = new SubscriptionManager()\n\n    constructor(client: MqttClient) {\n        super()\n\n        this.client = client\n        this.client.on('offline', () => {\n            this.emit('status', 'offline')\n        })\n\n        this.client.on('connect', () => {\n            this.emit('status', 'online')\n        })\n\n        this.client.on('connect', () => {\n            this.emit('status', 'online')\n        })\n\n        this.client.on('error', (error) => {\n            this.error = error\n            this.emit('error', error)\n        })\n\n        this.client.off('end', () => {\n            this.end(false)\n        })\n\n        this.client.on('message', (topic, message, packet) => {\n            this.subscriptions.handleMessage(topic, message, packet)\n        })\n    }\n\n    publish(\n        topic: string,\n        message: string | Buffer,\n        opts?: { qos?: 0 | 1 | 2; dup?: boolean; retain?: boolean },\n    ) {\n        this.client.publish(topic, message, {\n            qos: opts?.qos ?? 2,\n            dup: opts?.dup,\n            retain: opts?.retain,\n        })\n    }\n\n    async publishAsync(\n        topic: string,\n        message: string | Buffer,\n        opts?: { qos?: 0 | 1 | 2; dup?: boolean; retain?: boolean },\n    ): Promise<void> {\n        await this.client.publishAsync(topic, message, {\n            qos: opts?.qos ?? 2,\n            dup: opts?.dup,\n            retain: opts?.retain,\n        })\n    }\n\n    publishJson<T>(topic: string, message: T) {\n        this.publish(topic, JSON.stringify(message))\n    }\n\n    async publishJsonAsync<T>(topic: string, message: T): Promise<void> {\n        await this.publishAsync(topic, JSON.stringify(message))\n    }\n\n    unsubscribe(sub: Subscription<unknown>) {\n        sub.emit('end')\n        const group = this.subscriptions.remove(sub)\n        if (group?.isEmpty()) {\n            this.client.unsubscribe(group.topic)\n        }\n    }\n\n    subscribe<T>(\n        topic: string,\n        parser: MessageParser<T>,\n        options?: Partial<SubscriptionOptions>,\n    ): Subscription<T> {\n        const sub = new Subscription<T>({ mqtt: this, topic, parser, options })\n\n        const { resubscribe, group } = this.subscriptions.add(sub)\n\n        if (resubscribe) {\n            this.client.subscribe(sub.topic, {\n                qos: sub.options.qos,\n                rh: sub.options.rh,\n                rap: sub.options.rap,\n                nl: sub.options.nl,\n                properties: {\n                    subscriptionIdentifier: group.id,\n                },\n            })\n        }\n\n        return sub\n    }\n\n    subscribeString(\n        topic: string,\n        options?: Partial<SubscriptionOptions>,\n    ): Subscription<string> {\n        return this.subscribe(topic, stringParser, options)\n    }\n\n    subscribeJson<T>(\n        topic: string,\n        options?: Partial<SubscriptionOptions>,\n    ): Subscription<T> {\n        return this.subscribe<T>(topic, jsonParser, options)\n    }\n\n    // TODO: Subscribe zod\n\n    subscribeBinary(\n        topic: string,\n        options?: Partial<SubscriptionOptions>,\n    ): Subscription<Buffer> {\n        return this.subscribe(topic, binaryParser, options)\n    }\n\n    async unsubscribeAsync(sub: Subscription<unknown>) {\n        sub.emit('end')\n        const group = this.subscriptions.remove(sub)\n        if (group?.isEmpty()) {\n            await this.client.unsubscribeAsync(group.topic)\n        }\n    }\n\n    async subscribeAsync<T>(\n        topic: string,\n        parser: MessageParser<T>,\n        options?: Partial<SubscriptionOptions>,\n    ): Promise<Subscription<T>> {\n        const sub = new Subscription<T>({ mqtt: this, topic, parser, options })\n\n        const { resubscribe, group } = this.subscriptions.add(sub)\n\n        if (resubscribe) {\n            await this.client.subscribeAsync(sub.topic, {\n                qos: sub.options.qos,\n                rh: sub.options.rh,\n                rap: sub.options.rap,\n                nl: sub.options.nl,\n                properties: {\n                    subscriptionIdentifier: group.id,\n                },\n            })\n        }\n\n        return sub\n    }\n\n    async subscribeStringAsync(\n        topic: string,\n        options?: Partial<SubscriptionOptions>,\n    ): Promise<Subscription<string>> {\n        return this.subscribeAsync(topic, stringParser, options)\n    }\n\n    async subscribeJsonAsync<T>(\n        topic: string,\n        options?: Partial<SubscriptionOptions>,\n    ): Promise<Subscription<T>> {\n        return this.subscribeAsync<T>(topic, jsonParser, options)\n    }\n\n    async subscribeBinaryAsync(\n        topic: string,\n        options?: Partial<SubscriptionOptions>,\n    ): Promise<Subscription<Buffer>> {\n        return this.subscribeAsync(topic, binaryParser, options)\n    }\n\n    static async connectAsync(...args: ConnectArgs): Promise<BetterMQTT> {\n        const client = await mqtt.connectAsync(...(args as [any, any]))\n        return new BetterMQTT(client)\n    }\n\n    static connect(...args: ConnectArgs): BetterMQTT {\n        const client = mqtt.connect(...(args as [any, any]))\n        return new BetterMQTT(client)\n    }\n\n    end(endClient = true) {\n        const subs = this.subscriptions.all()\n        for (const sub of subs) {\n            sub.emit('end')\n            if (endClient) {\n                this.unsubscribe(sub)\n            }\n        }\n\n        if (endClient) {\n            this.client.end()\n        }\n\n        this.emit('end')\n    }\n\n    async endAsync(endClient = true) {\n        const subs = this.subscriptions.all()\n        for (const sub of subs) {\n            sub.emit('end')\n        }\n\n        if (endClient) {\n            await Promise.all(subs.map((sub) => this.unsubscribeAsync(sub)))\n            await this.client.endAsync()\n        }\n\n        this.emit('end')\n    }\n}\n","// lib.ts\n\n/**\n * Matches an MQTT topic against a subscription pattern and extracts the wildcard parameters.\n *\n * @param topic The topic string to test (e.g., \"system/events/ev123\").\n * @param pattern The subscription pattern (e.g., \"system/events/+\").\n * @returns An array of the captured parameter strings, or `null` if the topic does not match or the pattern is invalid.\n */\nexport function matchTopic(\n    topic: string,\n    pattern: string,\n): { params: string[] } | null {\n    if (!topic || !pattern) {\n        return null\n    }\n\n    const topicSegments = topic.split('/')\n    const patternSegments = pattern.split('/')\n\n    // Handle MQTT shared subscriptions\n    if (patternSegments[0] === '$share') {\n        if (patternSegments.length < 3) {\n            return null // Invalid $share pattern\n        }\n        patternSegments.splice(0, 2) // Remove $share and group-name\n    } else if (patternSegments[0] === '$queue') {\n        if (patternSegments.length < 2) {\n            return null // Invalid $queue pattern\n        }\n        patternSegments.shift() // Remove $queue\n    }\n\n    const params: string[] = []\n    const patternLen = patternSegments.length\n    const topicLen = topicSegments.length\n\n    for (let i = 0; i < patternLen; i++) {\n        const patternSegment = patternSegments[i]\n\n        if (patternSegment === '#') {\n            // # must be the last segment\n            if (i !== patternLen - 1) {\n                return null\n            }\n            // Capture the rest of the topic\n            params.push(topicSegments.slice(i).join('/'))\n            return { params }\n        }\n\n        // If we ran out of topic segments but pattern still has more (and not #), no match\n        if (i >= topicLen) {\n            return null\n        }\n\n        const topicSegment = topicSegments[i]\n\n        if (patternSegment === '+') {\n            params.push(topicSegment)\n        } else if (patternSegment !== topicSegment) {\n            return null\n        }\n    }\n\n    // If pattern finished but topic has more segments, no match (unless handled by # above)\n    if (topicLen > patternLen) {\n        return null\n    }\n\n    return { params }\n}\n","import type { IPublishPacket } from 'mqtt'\nimport { matchTopic } from './match'\nimport type { Subscription } from './subscription'\nimport type { BetterMQTTMessage, SubscriptionOptions } from './types'\n\n/**\n * This is a group of virtual subscriptions (`Subscription` class).\n * Multiple subscriptions can be grouped together if they have the same topic.\n *\n * There is a single SubscriptionGroup per topic.\n * This is due to the fact that MQTT protocol does not allow for\n * multiple subscriptions with the same topic, even if they have different options.\n */\nclass SubscriptionGroup {\n    topic: string\n    id: number\n    subs: Set<Subscription<unknown>>\n    options: SubscriptionOptions\n\n    retainedMessage: BetterMQTTMessage<Buffer<ArrayBufferLike>> | null = null\n\n    constructor(topic: string, id: number, options: SubscriptionOptions) {\n        this.topic = topic\n        this.id = id\n        this.subs = new Set()\n        this.options = options\n    }\n\n    handleMessage(\n        topic: string,\n        message: Buffer<ArrayBufferLike>,\n        _packet: IPublishPacket,\n        params?: string[],\n    ) {\n        const match = params ? { params } : matchTopic(topic, this.topic)\n\n        if (!match) {\n            return\n        }\n\n        if (this.options.rh < 2) {\n            this.retainedMessage = {\n                topic,\n                content: message,\n                params: match.params,\n            }\n        }\n\n        for (const sub of this.subs) {\n            sub.handleMessage(message, topic, match.params)\n        }\n    }\n\n    add(sub: Subscription<unknown>): boolean {\n        this.subs.add(sub)\n\n        // If we have a retained message, we need to send it to the new subscription\n        if (this.retainedMessage) {\n            sub.handleMessage(\n                this.retainedMessage.content,\n                this.retainedMessage.topic,\n                this.retainedMessage.params,\n            )\n        }\n\n        if (sub.options.qos !== this.options.qos) {\n            return true\n        }\n\n        if (sub.options.rh !== this.options.rh) {\n            return true\n        }\n\n        if (sub.options.rap !== this.options.rap) {\n            return true\n        }\n\n        if (sub.options.nl !== this.options.nl) {\n            return true\n        }\n\n        return false\n    }\n\n    remove(sub: Subscription<unknown>) {\n        this.subs.delete(sub)\n    }\n\n    isEmpty() {\n        return this.subs.size === 0\n    }\n}\n\ntype SubscriptionAddResult = {\n    group: SubscriptionGroup\n    resubscribe: boolean\n}\n\nexport class SubscriptionManager {\n    private nextSubIdentifier = 0\n\n    /**\n     * Subscription groups by subscription identifier\n     */\n    private subsById = new Map<number, SubscriptionGroup>()\n\n    /**\n     * Subscription groups by topic\n     */\n    private subsByTopic = new Map<string, SubscriptionGroup>()\n\n    nextId() {\n        return ++this.nextSubIdentifier\n    }\n\n    add(sub: Subscription<unknown>): SubscriptionAddResult {\n        const entry = this.subsByTopic.get(sub.topic)\n        // Existing group found\n        if (entry) {\n            // Add subscription to group\n            return {\n                resubscribe: entry.add(sub),\n                group: entry,\n            }\n        }\n\n        const id = this.nextId()\n        const group = new SubscriptionGroup(sub.topic, id, sub.options)\n        this.subsById.set(id, group)\n        this.subsByTopic.set(sub.topic, group)\n        group.add(sub)\n        return {\n            resubscribe: true,\n            group,\n        }\n    }\n\n    remove(sub: Subscription<unknown>) {\n        const group = this.subsByTopic.get(sub.topic)\n\n        // Subscription not registered\n        if (!group) {\n            return null\n        }\n\n        // Remove subscription from group\n        group.remove(sub)\n\n        // If group is empty, remove it\n        if (group.isEmpty()) {\n            this.subsById.delete(group.id)\n            this.subsByTopic.delete(group.topic)\n            return group\n        }\n\n        return group\n    }\n\n    handleMessage(\n        topic: string,\n        message: Buffer<ArrayBufferLike>,\n        packet: IPublishPacket,\n    ) {\n        const subId = packet.properties?.subscriptionIdentifier\n        if (!subId) {\n            // Fallback if no subscription identifier is present\n            for (const [subTopic, group] of this.subsByTopic.entries()) {\n                const match = matchTopic(topic, subTopic)\n                if (!match) {\n                    continue\n                }\n\n                group.handleMessage(topic, message, packet)\n            }\n\n            return\n        }\n\n        const subsIds = Array.isArray(subId) ? subId : [subId]\n        for (const id of subsIds) {\n            const group = this.subsById.get(id)\n            if (!group) {\n                continue\n            }\n\n            group.handleMessage(topic, message, packet)\n        }\n    }\n\n    all() {\n        const subs: Subscription<unknown>[] = []\n        for (const group of this.subsById.values()) {\n            for (const sub of group.subs) {\n                subs.push(sub)\n            }\n        }\n\n        return subs\n    }\n}\n","import { EventEmitter } from 'ee-ts'\nimport type { BetterMQTT } from '.'\nimport { createAsyncGenerator } from './generator'\nimport type { BetterMQTTMessage, SubscriptionOptions } from './types'\n\nexport interface SubscriptionEvents<T> {\n    message(message: BetterMQTTMessage<T>): void\n    end(): void\n    error(error: Error): void\n}\n\nexport class Subscription<T = string> extends EventEmitter<\n    SubscriptionEvents<T>\n> {\n    private mqtt: BetterMQTT\n\n    private generator: AsyncGenerator<BetterMQTTMessage<T>>\n\n    topic: string\n\n    /** Subscription options */\n    options: SubscriptionOptions\n\n    parser: (message: Buffer) => T\n\n    constructor(opts: {\n        mqtt: BetterMQTT\n        topic: string\n        parser: (message: Buffer) => T\n        options?: Partial<SubscriptionOptions>\n    }) {\n        super()\n\n        this.mqtt = opts.mqtt\n        this.topic = opts.topic\n        this.options = {\n            qos: opts.options?.qos ?? 2,\n            rh: opts.options?.rh ?? 2,\n            rap: opts.options?.rap ?? false,\n            nl: opts.options?.nl ?? false,\n        }\n        this.parser = opts.parser\n\n        const { generator, push, end, throwError } =\n            createAsyncGenerator<BetterMQTTMessage<T>>()\n\n        this.on('message', (message) => {\n            push(message)\n        })\n\n        this.on('end', () => {\n            end()\n        })\n\n        this.on('error', (error) => {\n            throwError(error)\n        })\n\n        this.generator = generator\n    }\n\n    handleMessage(\n        message: Buffer<ArrayBufferLike>,\n        topic: string,\n        params: string[],\n    ) {\n        const parsedMessage = this.parser(message)\n        this.emit('message', { topic, content: parsedMessage, params })\n    }\n\n    // The method that makes the class async iterable\n    [Symbol.asyncIterator](): AsyncGenerator<BetterMQTTMessage<T>> {\n        return this.generator\n    }\n\n    end() {\n        this.mqtt.unsubscribe(this)\n    }\n}\n","export interface AsyncGeneratorWithPush<T> {\n    push: (value: T) => void\n    throwError: (error: Error) => void\n    end: () => void\n    generator: AsyncGenerator<T>\n}\n\ntype QueueItem<T> =\n    | { type: 'value'; value: T }\n    | { type: 'error'; error: Error }\n    | { type: 'done' }\n\nexport function createAsyncGenerator<T>(): AsyncGeneratorWithPush<T> {\n    let resolve: () => void = () => undefined\n    // 'reject' is removed as it's not used\n    let promise: Promise<void> = new Promise((res) => {\n        resolve = res\n        // No 'rej' needed as errors are handled via the queue\n    })\n\n    const queue: QueueItem<T>[] = []\n    let closed = false\n\n    const push = (value: T): void => {\n        if (closed) {\n            // console.warn('Attempted to push to a closed generator.')\n            return\n        }\n        queue.push({ type: 'value', value })\n        resolve()\n        // Create a new promise for the next signal\n        promise = new Promise((res) => {\n            resolve = res\n        })\n    }\n\n    const throwError = (error: Error): void => {\n        if (closed) {\n            // console.warn('Attempted to throw error to a closed generator.')\n            return\n        }\n        queue.push({ type: 'error', error })\n        resolve()\n        // Create a new promise for the next signal\n        promise = new Promise((res) => {\n            resolve = res\n        })\n    }\n\n    const end = (): void => {\n        if (closed) {\n            // console.warn('Attempted to end a closed generator.')\n            return\n        }\n        closed = true\n        queue.push({ type: 'done' })\n        resolve()\n    }\n\n    async function* generator(): AsyncGenerator<T> {\n        while (true) {\n            if (queue.length > 0) {\n                const item = queue.shift() as QueueItem<T>\n\n                if (item.type === 'value') {\n                    yield item.value\n                } else if (item.type === 'error') {\n                    closed = true\n                    throw item.error\n                } else if (item.type === 'done') {\n                    break\n                }\n            } else {\n                await promise // Wait for a new value or a signal\n            }\n        }\n\n        closed = true\n    }\n\n    return { push, throwError, end, generator: generator() 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