Build Error with Bun After Upgrading to Next.js 15

I recently upgraded my project to Next.js 15 and now encounter a build error when using bun run build, although the local development environment works fine.

Below is the error message I'm seeing:
enter image description here

My current project setup is as follows:

TYPESCRIPTCopied
import { getBlogPosts } from "@/app/db/posts";
import { Tag } from "@/components/tag";
import { nonAccentVietnamese } from "@/lib/non-accent-vietnamese";
import { getAllTags, getPostsByTagSlug, sortTagsByCount } from "@/lib/tags";
import { Metadata } from "next";
import WritingList from "@/components/writing-list";
import { getItemsByYear } from "@/lib/utils";
import PageHeader from "@/components/page-header";

interface TagPageProps {
  params: {
    tag: string;
  };
}

export async function generateMetadata({
  params,
}: TagPageProps): Promise<Metadata> {
  const { tag } = params;
  const siteUrl = `/tags/${tag}`;
  const seoTitle = `Topic "${tag}"`
  const seoDescription = `Posts on the topic of ${tag}`

  return {
    title: seoTitle,
    description: seoDescription,
    keywords: [
      seoTitle,
      seoDescription
    ],
    openGraph: {
      title: seoTitle,
      description: seoDescription,
      url: siteUrl,
      images: siteUrl + "/og.png",
    },
    alternates: {
      canonical: siteUrl,
    },
  };
}

export const generateStaticParams = async () => {
  const posts = await getBlogPosts();
  const tags = getAllTags(posts);
  const paths = Object.keys(tags).map((tag) => ({ tag: nonAccentVietnamese(tag) }));
  return paths;
};

export default function TagPage({ params }: TagPageProps) {
  const { tag } = params;
  const title = tag.split("-").join(" ");
  const posts = getBlogPosts();
  const allPosts = getPostsByTagSlug(posts, tag);
  const displayPosts = allPosts.filter(post => post.metadata.publishedAt);
  const tags = getAllTags(posts);
  const sortedTags = sortTagsByCount(tags);

  const itemsByYear = getItemsByYear(displayPosts);
  const years = Object.keys(itemsByYear).map(Number).sort(
    (a, b) => b - a,
  );

  return (
    <section>
      <PageHeader
        title={`Topic: ${title}`}
        description={`Posts on the topic of ${tag}`}
      />
        <div className="mb-8 flex flex-wrap gap-2">
          {sortedTags?.map((t, index) => (
            <Tag tag={t} key={index} count={tags[t]} current={nonAccentVietnamese(t) === tag} />
          ))}
        </div>
        {displayPosts?.length > 0 ? (
          <WritingList
            getItemsByYear={itemsByYear}
            years={years}
            url={"blog"}
          />
        ) : (
          <p>No posts available for the tag <strong>{title}</strong>.</p>
        )
      }
    </section>
  );
}

Folder structure:

PLAINTEXTCopied
...
  app
   |__(single-page)
          |__tags
               |__[tag]
                    |__page.tsx
       
  components
  ...

What I’ve tried:

• Verified that all dependencies are compatible with Next.js 15.
• Reviewed the Next.js 15 release notes for breaking changes.
• Ran bun install to ensure all packages are correctly installed.

Despite these checks, the error persists during the build process.

I would appreciate any insights into what might be causing the issue and suggestions for resolving it. Please let me know if additional details are needed.

Thank you!