GoogleChrome/lighthouse · error · Error

${pluginName} has unrecognized ${objectName}properties: [${k

Error message

${pluginName} has unrecognized ${objectName}properties: [${keys}]

What it means

Error "${pluginName} has unrecognized ${objectName}properties: [${keys}]" thrown in GoogleChrome/lighthouse.

Source

Thrown at core/config/config-plugin.js:59

  return arr.every(objectIsGatherMode);
}

/**
 * Asserts that obj has no own properties, throwing a nice error message if it does.
 * Plugin and object name are included for nicer logging.
 * @param {Record<string, unknown>} obj
 * @param {string} pluginName
 * @param {string=} objectName
 */
function assertNoExcessProperties(obj, pluginName, objectName = '') {
  if (objectName) {
    objectName += ' ';
  }

  const invalidKeys = Object.keys(obj);
  if (invalidKeys.length > 0) {
    const keys = invalidKeys.join(', ');
    throw new Error(`${pluginName} has unrecognized ${objectName}properties: [${keys}]`);
  }
}

/**
 * A set of methods for extracting and validating a Lighthouse plugin config.
 */
class ConfigPlugin {
  /**
   * Extract and validate the list of AuditDefns added by the plugin (or undefined
   * if no additional audits are being added by the plugin).
   * @param {unknown} auditsJson
   * @param {string} pluginName
   * @return {Array<{path: string}>|undefined}
   */
  static _parseAuditsList(auditsJson, pluginName) {
    // Plugin audits aren't required (relying on LH default audits) so fall back to [].
    if (auditsJson === undefined) {
      return undefined;

View on GitHub (pinned to 9515cd4e58)

Solutions

1. Remove the unrecognized properties from the plugin object.
2. Check the plugin documentation for the list of supported properties (audits, category, groups, supportedModes).

When it happens

Trigger: Thrown when a plugin object contains properties Lighthouse does not recognize.

Common situations: See trigger scenarios.

AI-assisted analysis of GoogleChrome/lighthouse@9515cd4e58 (2026-08-13). Data as JSON: /api/errors/a0e859cf36d7a43f. Report an issue: GitHub.