Lightstar/node_modules/motion-utils/dist/cjs/index.js

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

function addUniqueItem(arr, item) {
    if (arr.indexOf(item) === -1)
        arr.push(item);
}
function removeItem(arr, item) {
    const index = arr.indexOf(item);
    if (index > -1)
        arr.splice(index, 1);
}
// Adapted from array-move
function moveItem([...arr], fromIndex, toIndex) {
    const startIndex = fromIndex < 0 ? arr.length + fromIndex : fromIndex;
    if (startIndex >= 0 && startIndex < arr.length) {
        const endIndex = toIndex < 0 ? arr.length + toIndex : toIndex;
        const [item] = arr.splice(fromIndex, 1);
        arr.splice(endIndex, 0, item);
    }
    return arr;
}

exports.warning = () => { };
exports.invariant = () => { };
if (process.env.NODE_ENV !== "production") {
    exports.warning = (check, message) => {
        if (!check && typeof console !== "undefined") {
            console.warn(message);
        }
    };
    exports.invariant = (check, message) => {
        if (!check) {
            throw new Error(message);
        }
    };
}

const MotionGlobalConfig = {
    skipAnimations: false,
    useManualTiming: false,
};

/*#__NO_SIDE_EFFECTS__*/
function memo(callback) {
    let result;
    return () => {
        if (result === undefined)
            result = callback();
        return result;
    };
}

/*#__NO_SIDE_EFFECTS__*/
const noop = (any) => any;

/*
  Progress within given range

  Given a lower limit and an upper limit, we return the progress
  (expressed as a number 0-1) represented by the given value, and
  limit that progress to within 0-1.

  @param [number]: Lower limit
  @param [number]: Upper limit
  @param [number]: Value to find progress within given range
  @return [number]: Progress of value within range as expressed 0-1
*/
/*#__NO_SIDE_EFFECTS__*/
const progress = (from, to, value) => {
    const toFromDifference = to - from;
    return toFromDifference === 0 ? 1 : (value - from) / toFromDifference;
};

class SubscriptionManager {
    constructor() {
        this.subscriptions = [];
    }
    add(handler) {
        addUniqueItem(this.subscriptions, handler);
        return () => removeItem(this.subscriptions, handler);
    }
    notify(a, b, c) {
        const numSubscriptions = this.subscriptions.length;
        if (!numSubscriptions)
            return;
        if (numSubscriptions === 1) {
            /**
             * If there's only a single handler we can just call it without invoking a loop.
             */
            this.subscriptions[0](a, b, c);
        }
        else {
            for (let i = 0; i < numSubscriptions; i++) {
                /**
                 * Check whether the handler exists before firing as it's possible
                 * the subscriptions were modified during this loop running.
                 */
                const handler = this.subscriptions[i];
                handler && handler(a, b, c);
            }
        }
    }
    getSize() {
        return this.subscriptions.length;
    }
    clear() {
        this.subscriptions.length = 0;
    }
}

/**
 * Converts seconds to milliseconds
 *
 * @param seconds - Time in seconds.
 * @return milliseconds - Converted time in milliseconds.
 */
/*#__NO_SIDE_EFFECTS__*/
const secondsToMilliseconds = (seconds) => seconds * 1000;
/*#__NO_SIDE_EFFECTS__*/
const millisecondsToSeconds = (milliseconds) => milliseconds / 1000;

/*
  Convert velocity into velocity per second

  @param [number]: Unit per frame
  @param [number]: Frame duration in ms
*/
function velocityPerSecond(velocity, frameDuration) {
    return frameDuration ? velocity * (1000 / frameDuration) : 0;
}

const warned = new Set();
function hasWarned(message) {
    return warned.has(message);
}
function warnOnce(condition, message, element) {
    if (condition || warned.has(message))
        return;
    console.warn(message);
    if (element)
        console.warn(element);
    warned.add(message);
}

exports.MotionGlobalConfig = MotionGlobalConfig;
exports.SubscriptionManager = SubscriptionManager;
exports.addUniqueItem = addUniqueItem;
exports.hasWarned = hasWarned;
exports.memo = memo;
exports.millisecondsToSeconds = millisecondsToSeconds;
exports.moveItem = moveItem;
exports.noop = noop;
exports.progress = progress;
exports.removeItem = removeItem;
exports.secondsToMilliseconds = secondsToMilliseconds;
exports.velocityPerSecond = velocityPerSecond;
exports.warnOnce = warnOnce;