linshenkx/prompt-optimizer · warning · FavoriteValidationError

Target tag cannot be empty

Error message

Target tag cannot be empty

What it means

FavoriteValidationError thrown by mergeTags when targetTag is falsy — the destination tag for the merge must be a non-empty string.

Source

Thrown at packages/core/src/services/favorite/manager.ts:1046

          return tagsList;
        });
      }

      await this.updateStats();
      return affectedCount;
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : String(error);
      throw new FavoriteStorageError(`Failed to rename tag: ${errorMessage}`);
    }
  }

  async mergeTags(sourceTags: string[], targetTag: string): Promise<number> {
    if (!sourceTags || sourceTags.length === 0) {
      throw new FavoriteValidationError('Source tag list cannot be empty');
    }

    if (!targetTag) {
      throw new FavoriteValidationError('Target tag cannot be empty');
    }

    let affectedCount = 0;

    try {
      // 1. 更新独立标签库:删除所有源标签,确保目标标签存在
      await this.storageProvider.updateData(this.STORAGE_KEYS.TAGS, (tags: FavoriteTag[] | null) => {
        const tagsList = tags || [];

        // 删除所有源标签
        const filteredTags = tagsList.filter(t => !sourceTags.includes(t.tag));

        // 确保目标标签存在
        const hasTargetTag = filteredTags.some(t => t.tag === targetTag);
        if (!hasTargetTag) {
          filteredTags.push({
            tag: targetTag,
            createdAt: Date.now()

View on GitHub (pinned to 3e677b1d9f)

Solutions

1. Validate targetTag is a non-empty string before merging
2. Default the target to one of the source tags in UI flows

Example fix

// before
await manager.mergeTags(sources, target);

// after
if (sources.length && target) {
  await manager.mergeTags(sources, target);
}

if (targetTag) await manager.mergeTags(sourceTags, targetTag);

When it happens

Trigger: Calling mergeTags(['a'], '') or passing null/undefined as targetTag.

Common situations: Merge dialog with an unset target; target cleared by user before submission.

Related errors

• Source tag list cannot be empty
• Tag name cannot be empty
• Failed to merge tags: ${errorMessage}
• Cannot delete the last prompt asset version
• Cannot delete the current prompt asset version

AI-assisted analysis of linshenkx/prompt-optimizer@3e677b1d9f (2026-08-27). Data as JSON: /api/errors/9c408ef4da0a3f35. Report an issue: GitHub.