plane/packages/ui/src/form-fields/textarea.tsx

import * as React from "react";

export interface TextAreaProps
  extends React.TextareaHTMLAttributes<HTMLTextAreaElement> {
  mode?: "primary" | "transparent";
  hasError?: boolean;
  className?: string;
}

// Updates the height of a <textarea> when the value changes.
const useAutoSizeTextArea = (
  textAreaRef: HTMLTextAreaElement | null,
  value: any
) => {
  React.useEffect(() => {
    if (textAreaRef) {
      // We need to reset the height momentarily to get the correct scrollHeight for the textarea
      textAreaRef.style.height = "0px";
      const scrollHeight = textAreaRef.scrollHeight;

      // We then set the height directly, outside of the render loop
      // Trying to set this with state or a ref will product an incorrect value.
      textAreaRef.style.height = scrollHeight + "px";
    }
  }, [textAreaRef, value]);
};

const TextArea = React.forwardRef<HTMLTextAreaElement, TextAreaProps>(
  (props, ref) => {
    const {
      id,
      name,
      value = "",
      rows = 1,
      cols = 1,
      mode = "primary",
      hasError = false,
      className = "",
      ...rest
    } = props;

    const textAreaRef = React.useRef<any>(ref);

    ref && useAutoSizeTextArea(textAreaRef?.current, value);

    return (
      <textarea
        id={id}
        name={name}
        ref={textAreaRef}
        value={value}
        rows={rows}
        cols={cols}
        className={`no-scrollbar w-full bg-transparent placeholder-custom-text-400 px-3 py-2 outline-none ${
          mode === "primary"
            ? "rounded-md border border-custom-border-200"
            : mode === "transparent"
            ? "rounded border-none bg-transparent ring-0 transition-all focus:ring-1 focus:ring-theme"
            : ""
        } ${hasError ? "border-red-500" : ""} ${
          hasError && mode === "primary" ? "bg-red-100" : ""
        } ${className}`}
        {...rest}
      />
    );
  }
);

export { TextArea };