linshenkx/prompt-optimizer · error · FavoriteValidationError

Invalid function mode in import data: functionMode=${functio

Error message

Invalid function mode in import data: functionMode=${functionMode}, optimizationMode=${optimizationMode}, imageSubMode=${imageSubMode}

What it means

Each imported favorite's mode combination must pass TypeMapper.validateMapping for { functionMode, optimizationMode, imageSubMode }. Defaults are applied first (functionMode 'basic', optimizationMode 'system' for non-image modes, imageSubMode 'text2image' for image), so this only fires when explicit values are invalid or inconsistent.

Source

Thrown at packages/core/src/services/favorite/manager.ts:1355

        const favoritesToImport = Array.isArray(importData.favorites) ? importData.favorites : [];

        favoritesToImport.forEach((favorite: any) => {
          try {
            if (!favorite || typeof favorite.content !== 'string' || !favorite.content.trim()) {
              throw new FavoriteValidationError('Import data contains favorite with empty content');
            }

            const functionMode = favorite.functionMode || 'basic';
            const optimizationMode =
              favorite.optimizationMode ||
              (functionMode !== 'image' ? 'system' : undefined);
            const imageSubMode =
              favorite.imageSubMode ||
              (functionMode === 'image' ? 'text2image' : undefined);

            const mapping = { functionMode, optimizationMode, imageSubMode };
            if (!TypeMapper.validateMapping(mapping)) {
              throw new FavoriteValidationError(
                `Invalid function mode in import data: functionMode=${functionMode}, optimizationMode=${optimizationMode}, imageSubMode=${imageSubMode}`
              );
            }

            const category = categoryMapping[favorite.category] || favorite.category;
            const tags = sanitizeTags(favorite.tags);
            const createdAt = parseTimestamp(favorite.createdAt, baseTimestamp + timestampOffset);
            const updatedAt = parseTimestamp(favorite.updatedAt, createdAt);
            const useCount = typeof favorite.useCount === 'number' && favorite.useCount >= 0
              ? favorite.useCount
              : 0;

            const existingFavorite = existingFavoritesMap.get(favorite.content);

            if (existingFavorite) {
              if (mergeStrategy === 'skip') {
                result.skipped++;
                return;

View on GitHub (pinned to 3e677b1d9f)

Solutions

1. Check the library's supported functionMode/optimizationMode/imageSubMode values and fix the offending entries (the error message names the exact invalid triple)
2. Upgrade or pin the library to the version whose TypeMapper knows the modes in your export
3. Normalize legacy mode names to current ones before importing

Example fix

// before
const fav = { content: 'x', functionMode: 'img', optimizationMode: 'system' };

// after
const fav = { content: 'x', functionMode: 'image', imageSubMode: 'text2image' };

import { TypeMapper } from '<lib>';
const ok = parsed.favorites.every((f: any) =>
  TypeMapper.validateMapping({
    functionMode: f.functionMode || 'basic',
    optimizationMode: f.optimizationMode || (f.functionMode !== 'image' ? 'system' : undefined),
    imageSubMode: f.imageSubMode || (f.functionMode === 'image' ? 'text2image' : undefined),
  })
);

const isValidModes = (f: any): boolean =>
  TypeMapper.validateMapping({
    functionMode: f.functionMode || 'basic',
    optimizationMode: f.optimizationMode || (f.functionMode !== 'image' ? 'system' : undefined),
    imageSubMode: f.imageSubMode || (f.functionMode === 'image' ? 'text2image' : undefined),
  });

try {
  await manager.importFavorites(data);
} catch (e) {
  if (e instanceof FavoriteValidationError && /Invalid function mode/.test(e.message)) {
    // message names the invalid triple; normalize or drop the offending entries and retry
  }
}

When it happens

Trigger: Importing a favorite with an unknown functionMode, an invalid optimizationMode, or an image-mode entry whose imageSubMode/optimizationMode combination is not a registered mapping.

Common situations: Exports produced by a newer or older library version with renamed/added modes, manually edited mode strings, or data from a different product line with its own mode vocabulary.

Related errors

• Invalid import data format
• Import data contains favorite with empty content
• CONTEXT_ERROR_CODES.STORAGE_ERROR
• CONTEXT_ERROR_CODES.IMPORT_FORMAT_ERROR
• DATA_ERROR_CODES.ELECTRON_API_UNAVAILABLE

AI-assisted analysis of linshenkx/prompt-optimizer@3e677b1d9f (2026-08-27). Data as JSON: /api/errors/7ea4759531d2b704. Report an issue: GitHub.