facebook/lexical · warning

Minified Lexical warning #${code}; visit ${url.toString()} f

Error message

Minified Lexical warning #${code}; visit ${url.toString()} for the full message or use the non-minified dev environment for full errors and additional helpful warnings.

What it means

In production builds Lexical replaces verbose developer warnings with minified codes to keep bundle size down. formatProdWarningMessage prints this message with a URL (error-codes lookup) that embeds the code and the original arguments as query params, so developers can decode the full warning text.

Source

Thrown at packages/lexical-internal/src/formatProdWarningMessage.ts:21

 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */

export default function formatProdWarningMessage(
  code: string,
  ...args: string[]
): void {
  const url = new URL('https://lexical.dev/docs/error');
  const params = new URLSearchParams();
  params.append('code', code);
  for (const arg of args) {
    params.append('v', arg);
  }
  url.search = params.toString();

  console.warn(
    `Minified Lexical warning #${code}; visit ${url.toString()} for the full message or use the non-minified dev environment for full errors and additional helpful warnings.`,
  );
}

View on GitHub (pinned to 76a22dcba9)

Solutions

1. Open the URL in the message (with code and v params) to see the full decoded warning.
2. Build/run with the development (non-minified) Lexical bundle to get the complete message and extra warnings inline.
3. Keep dev/prod builds consistent while debugging: use `pnpm run build` (dev) artifacts or source-condition imports.
4. Check the scripts/error-codes/codes.json mapping if you need the warning text offline.

Example fix

null

null

null

const origWarn = console.warn;
console.warn = (...args) => {
  const m = String(args[0]);
  if (m.startsWith('Minified Lexical warning #')) {
    origWarn('Lexical warning:', decodeLexicalWarning(m)); // resolve the URL
  } else { origWarn(...args); }
};

When it happens

Trigger: Any console.warn surfaced through Lexical's warning infra in a __DEV__-false (minified production) build — the raw dev warning text is replaced by this message containing warning number `code`.

Common situations: Running the minified production bundle during development/debugging; a stale-prod build shipped to staging; users reporting warnings that look opaque.

Related errors

• Minified Lexical error #${code}; visit ${url.toString()} for

AI-assisted analysis of facebook/lexical@76a22dcba9 (2026-08-31). Data as JSON: /api/errors/4cef2f28f259fd6f. Report an issue: GitHub.