flipper-plugin/lib/utils/LowPassFilter.js

Flipper Desktop plugin SDK and components

"use strict";
/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 */
Object.defineProperty(exports, "__esModule", { value: true });
class LowPassFilter {
    constructor(smoothing = 0.9) {
        this._nextReduce = (last, current) => {
            return this.smoothing * current + (1 - this.smoothing) * last;
        };
        this.smoothing = smoothing;
        this.buffer = [];
        this.bufferMaxSize = 5;
    }
    hasFullBuffer() {
        return this.buffer.length === this.bufferMaxSize;
    }
    push(value) {
        let removed = 0;
        if (this.hasFullBuffer()) {
            const tmp = this.buffer.shift();
            if (tmp === undefined)
                throw new Error('Invariant violation: Buffer reported full but shift returned nothing.');
            removed = tmp;
        }
        this.buffer.push(value);
        return removed;
    }
    next(nextValue) {
        // push new value to the end, and remove oldest one
        const removed = this.push(nextValue);
        // smooth value using all values from buffer
        const result = this.buffer.reduce(this._nextReduce, removed);
        // replace smoothed value
        this.buffer[this.buffer.length - 1] = result;
        return result;
    }
}
exports.default = LowPassFilter;
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