next-mdx-remote v4 (#737)

components/CopyButton/CopyButton.module.css

@@ -0,0 +1,19 @@
+.copy {
+  position: absolute;
+  top: 0;
+  right: 0;
+  padding: 0.65em;
+  line-height: 1;
+  color: var(--medium-dark);
+  background-color: var(--background-inner);
+  border: 1px solid var(--kinda-light);
+  cursor: pointer;
+}
+
+.copy:hover {
+  color: var(--link);
+}
+
+.success {
+  color: var(--success) !important;
+}

components/CopyButton/CopyButton.tsx

@@ -0,0 +1,61 @@
+import { useState, useEffect } from "react";
+import classNames from "classnames/bind";
+import copy from "copy-to-clipboard";
+import innerText from "react-innertext";
+import { ClipboardOcticon, CheckOcticon } from "../Icons";
+import type { ReactNode } from "react";
+
+import styles from "./CopyButton.module.css";
+const cx = classNames.bind(styles);
+
+type Props = {
+  source: ReactNode;
+  timeout?: number;
+};
+
+const CopyButton = ({ source, timeout = 2000 }: Props) => {
+  const [copied, setCopied] = useState(false);
+
+  const handleCopy = (e) => {
+    // prevent unintentional double-clicks by unfocusing button
+    e.target.blur();
+
+    // send plaintext to the clipboard
+    const didCopy = copy(innerText(source));
+
+    // indicate success
+    setCopied(didCopy);
+  };
+
+  useEffect(() => {
+    // reset to original icon after given ms (defaults to 2 seconds)
+    if (copied) {
+      const reset = setTimeout(() => {
+        setCopied(false);
+      }, timeout);
+
+      return () => clearTimeout(reset);
+    }
+
+    // eslint-disable-next-line @typescript-eslint/no-empty-function
+    return () => {};
+  }, [timeout, copied]);
+
+  return (
+    <button
+      className={cx({ copy: true, success: !!copied })}
+      title="Copy to clipboard"
+      aria-label="Copy to clipboard"
+      onClick={handleCopy}
+      disabled={!!copied}
+    >
+      {copied ? (
+        <CheckOcticon className="icon" fill="currentColor" />
+      ) : (
+        <ClipboardOcticon className="icon" fill="currentColor" />
+      )}
+    </button>
+  );
+};
+
+export default CopyButton;