trading-signals/dist/trend/EMA/EMA.js

Technical indicators to run technical analysis with JavaScript / TypeScript.

import { MovingAverage } from '../MA/MovingAverage.js';
import { NotEnoughDataError } from '../../error/index.js';
export class EMA extends MovingAverage {
    #pricesCounter = 0;
    #weightFactor;
    interval;
    constructor(interval) {
        super(interval);
        this.interval = interval;
        this.#weightFactor = 2 / (this.interval + 1);
    }
    getRequiredInputs() {
        return this.interval;
    }
    update(price, replace) {
        if (!replace) {
            this.#pricesCounter++;
        }
        else if (replace && this.#pricesCounter === 0) {
            this.#pricesCounter++;
        }
        if (replace && this.previousResult !== undefined) {
            return this.setResult(price * this.#weightFactor + this.previousResult * (1 - this.#weightFactor), replace);
        }
        return this.setResult(price * this.#weightFactor + (this.result !== undefined ? this.result : price) * (1 - this.#weightFactor), replace);
    }
    getResultOrThrow() {
        if (this.#pricesCounter < this.interval) {
            throw new NotEnoughDataError(this.getRequiredInputs());
        }
        return this.result;
    }
    get isStable() {
        try {
            this.getResultOrThrow();
            return true;
        }
        catch {
            return false;
        }
    }
}
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