bun.sh/test/integration/vite-build/the-test-app/app/lib/utils.ts

import { clsx, type ClassValue } from "clsx";
import dayjs from "dayjs";
import isToday from "dayjs/plugin/isToday";
import isYesterday from "dayjs/plugin/isYesterday";
import localizedFormat from "dayjs/plugin/localizedFormat";
import relativeTime from "dayjs/plugin/relativeTime";
import _slugify from "slugify";
import { cubicOut } from "svelte/easing";
import type { TransitionConfig } from "svelte/transition";
import { twMerge } from "tailwind-merge";

_slugify.extend({ ".": "-", _: "-", "+": "-" });

dayjs.extend(localizedFormat);
dayjs.extend(relativeTime);
dayjs.extend(isToday);
dayjs.extend(isYesterday);

export const cn = (...inputs: ClassValue[]) => {
  return twMerge(clsx(inputs));
};

type FlyAndScaleParams = {
  y?: number;
  x?: number;
  start?: number;
  duration?: number;
};

export const flyAndScale = (
  node: Element,
  params: FlyAndScaleParams = { y: -8, x: 0, start: 0.95, duration: 150 },
): TransitionConfig => {
  const style = getComputedStyle(node);
  const transform = style.transform === "none" ? "" : style.transform;

  const scaleConversion = (
    valueA: number,
    scaleA: [number, number],
    scaleB: [number, number],
  ) => {
    const [minA, maxA] = scaleA;
    const [minB, maxB] = scaleB;

    const percentage = (valueA - minA) / (maxA - minA);
    const valueB = percentage * (maxB - minB) + minB;

    return valueB;
  };

  const styleToString = (
    style: Record<string, number | string | undefined>,
  ): string => {
    return Object.keys(style).reduce((str, key) => {
      if (style[key] === undefined) return str;
      return str + `${key}:${style[key]};`;
    }, "");
  };

  return {
    duration: params.duration ?? 200,
    delay: 0,
    css: (t) => {
      const y = scaleConversion(t, [0, 1], [params.y ?? 5, 0]);
      const x = scaleConversion(t, [0, 1], [params.x ?? 0, 0]);
      const scale = scaleConversion(t, [0, 1], [params.start ?? 0.95, 1]);

      return styleToString({
        transform: `${transform} translate3d(${x}px, ${y}px, 0) scale(${scale})`,
        opacity: t,
      });
    },
    easing: cubicOut,
  };
};