matterbridge-dyson-robot/dist/decorator-changed.js

A Matterbridge plugin that connects Dyson robot vacuums and air treatment devices to the Matter smart home ecosystem via their local or cloud MQTT APIs.

// Matterbridge plugin for Dyson robot vacuum and air treatment devices
// Copyright © 2025-2026 Alexander Thoukydides
import { isDeepStrictEqual } from 'util';
import { formatList } from './utils.js';
export class Changed {
    log;
    // The previous values
    prevValues = new Map();
    // Construct a new value change tracker
    constructor(log) {
        this.log = log;
    }
    // Check if the value has changed
    isChanged(key, newValue) {
        const oldValue = this.prevValues.get(key);
        const changed = !isDeepStrictEqual(oldValue, newValue);
        if (changed) {
            this.log.debug(`${String(key)} changed: ${diffChanged(oldValue, newValue)}`);
            this.setLast(key, newValue);
        }
        return changed;
    }
    // Set the last value
    setLast(key, value) {
        this.prevValues.set(key, structuredClone(value));
    }
    // Flush previous values, so anything new is considered a change
    flush(key) {
        if (key)
            this.prevValues.delete(key);
        else
            this.prevValues.clear();
    }
}
// Decorator to only invoke method if the parameter value has changed
export function ifValueChanged(originalMethod, context) {
    function replacementMethod(value) {
        if (this.changed.isChanged(context.name, value)) {
            return originalMethod.call(this, value);
        }
        // Must return a Promise in async context, but also safe when R is void
        return Promise.resolve();
    }
    return replacementMethod;
}
// Diff two values (that are not equal)
function diffChanged(oldValue, newValue) {
    const isObject = (value) => typeof value === 'object' && value !== null;
    const stringify = (value) => JSON.stringify(value);
    // Handle non-object comparisons
    if (!isObject(oldValue) || !isObject(newValue)) {
        return `${stringify(oldValue)} → ${stringify(newValue)}`;
    }
    // Compare the individual properties of objects
    const oldObj = oldValue;
    const newObj = newValue;
    const diffs = [...new Set([...Object.keys(oldObj), ...Object.keys(newObj)])]
        .filter(key => !isDeepStrictEqual(oldObj[key], newObj[key]))
        .map(key => `${key}: ${stringify(oldObj[key])} → ${stringify(newObj[key])}`);
    return formatList(diffs);
}
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