cal.pub0.org/packages/ui/components/button/Button.tsx

import Link, { LinkProps } from "next/link";
import React, { forwardRef } from "react";
import { Icon } from "react-feather";

import classNames from "@calcom/lib/classNames";

import Tooltip from "../../v2/core/Tooltip";

export type ButtonBaseProps = {
  /* Primary: Signals most important actions at any given point in the application.
       Secondary: Gives visual weight to actions that are important
       Minimal: Used for actions that we want to give very little significane to */
  color?: keyof typeof variantClassName;
  /**Default: H = 36px (default)
       Large: H = 38px (Onboarding, modals)
       Icon: Makes the button be an icon button */
  size?: "base" | "lg" | "icon";
  /**Signals the button is loading */
  loading?: boolean;
  /** Disables the button from being clicked */
  disabled?: boolean;
  /** Action that happens when the button is clicked */
  onClick?: (event: React.MouseEvent<HTMLElement, MouseEvent>) => void;
  /**Left aligned icon*/
  StartIcon?: Icon | React.ElementType;
  /**Right aligned icon */
  EndIcon?: Icon;
  shallow?: boolean;
  /**Tool tip used when icon size is set to small */
  tooltip?: string;
  /** @deprecated This has now been replaced by button group. */
  combined?: boolean;
  flex?: boolean;
};
export type ButtonProps = ButtonBaseProps &
  (
    | (Omit<JSX.IntrinsicElements["a"], "href" | "onClick" | "ref"> & LinkProps)
    | (Omit<JSX.IntrinsicElements["button"], "onClick" | "ref"> & { href?: never })
  );

const variantClassName = {
  primary:
    "border border-transparent text-white bg-brand-500 hover:bg-brand-400 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-brand-500",
  secondary: "border border-gray-200 text-brand-900 bg-white hover:bg-gray-100",
  minimal:
    "text-gray-700 bg-transparent hover:bg-gray-100 focus:outline-none focus:ring-offset-1 focus:bg-gray-100 focus:ring-brand-900 dark:text-darkgray-900 hover:dark:text-gray-50",
  minimalSecondary:
    "text-gray-700 bg-transparent hover:bg-gray-100 dark:hover:bg-darkgray-200 focus:outline-none focus:ring-2 focus:ring-offset-1 focus:bg-gray-100 focus:ring-brand-900 dark:text-darkgray-900 hover:dark:text-gray-50 border border-transparent hover:border-gray-300 dark:hover:border-darkgray-300",
  destructive:
    "text-gray-900 focus:text-red-700 bg-transparent hover:bg-red-100 hover:text-red-700 focus:outline-none focus:ring-2 focus:ring-offset-1 focus:bg-red-100 focus:ring-red-700",
};
const variantDisabledClassName = {
  primary: "border border-transparent bg-brand-500 bg-opacity-20 text-white",
  secondary: "border border-gray-200 text-brand-900 bg-white opacity-30",
  minimal: "text-gray-400 bg-transparent",
  minimalSecondary: "text-gray-400 bg-transparent",
  destructive: "text-red-700 bg-transparent opacity-30",
};

export const Button = forwardRef<HTMLAnchorElement | HTMLButtonElement, ButtonProps>(function Button(
  props: ButtonProps,
  forwardedRef
) {
  const {
    loading = false,
    color = "primary",
    size = "base",
    type = "button",
    StartIcon,
    EndIcon,
    shallow,
    combined = false,
    // attributes propagated from `HTMLAnchorProps` or `HTMLButtonProps`
    ...passThroughProps
  } = props;
  // Buttons are **always** disabled if we're in a `loading` state
  const disabled = props.disabled || loading;
  // If pass an `href`-attr is passed it's `<a>`, otherwise it's a `<button />`
  const isLink = typeof props.href !== "undefined";
  const elementType = isLink ? "a" : "button";
  const element = React.createElement(
    elementType,
    {
      ...passThroughProps,
      disabled,
      type: !isLink ? type : undefined,
      ref: forwardedRef,
      className: classNames(
        // base styles independent what type of button it is
        "inline-flex items-center text-sm font-medium relative",
        // different styles depending on size
        size === "base" && "h-9 px-4 py-2.5  ",
        size === "lg" && "h-[36px] px-4 py-2.5 ",
        size === "icon" && "flex justify-center min-h-[36px] min-w-[36px] ",
        combined ? "" : "rounded-md",
        // different styles depending on color
        // set not-allowed cursor if disabled
        disabled ? variantDisabledClassName[color] : variantClassName[color],
        loading ? "cursor-wait" : disabled ? "cursor-not-allowed" : "",
        props.className
      ),
      // if we click a disabled button, we prevent going through the click handler
      onClick: disabled
        ? (e: React.MouseEvent<HTMLElement, MouseEvent>) => {
            e.preventDefault();
          }
        : props.onClick,
    },
    <>
      {StartIcon && (
        <StartIcon
          className={classNames("inline-flex", size === "icon" ? "h-4 w-4 " : "mr-2 h-4 w-4 stroke-[1.5px]")}
        />
      )}
      {props.children}
      {loading && (
        <div className="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 transform">
          <svg
            className={classNames(
              "mx-4 h-5 w-5 animate-spin",
              color === "primary" ? "text-white dark:text-black" : "text-black"
            )}
            xmlns="http://www.w3.org/2000/svg"
            fill="none"
            viewBox="0 0 24 24">
            <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
            <path
              className="opacity-75"
              fill="currentColor"
              d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
            />
          </svg>
        </div>
      )}
      {EndIcon && <EndIcon className="-mr-1 inline h-5 w-5 ltr:ml-2 rtl:mr-2" />}
    </>
  );

  return props.href ? (
    <Link passHref href={props.href} shallow={shallow && shallow}>
      {element}
    </Link>
  ) : (
    <Wrapper tooltip={props.tooltip}>{element}</Wrapper>
  );
});

const Wrapper = ({ children, tooltip }: { tooltip?: string; children: React.ReactNode }) => {
  if (!tooltip) {
    return <>{children}</>;
  }

  return <Tooltip content={tooltip}>{children}</Tooltip>;
};