facebook/docusaurus · error · Error

Processing of blog source file path=${blogSourceFile} failed

Error message

Processing of blog source file path=${blogSourceFile} failed.

What it means

Wrapper error thrown by doProcessBlogSourceFile when the underlying processBlogSourceFile rejects for any reason. The original error is attached via {cause: err}. The message identifies the blog source file path that failed, so you can locate the offending post even though the inner cause carries the specifics.

Source

Thrown at packages/docusaurus-plugin-content-blog/src/blogUtils.ts:416

  }

  const blogSourceFiles = await Globby(include, {
    cwd: contentPaths.contentPath,
    ignore: exclude,
  });

  async function doProcessBlogSourceFile(blogSourceFile: string) {
    try {
      return await processBlogSourceFile(
        blogSourceFile,
        contentPaths,
        context,
        options,
        tagsFile,
        authorsMap,
      );
    } catch (err) {
      throw new Error(
        `Processing of blog source file path=${blogSourceFile} failed.`,
        {cause: err},
      );
    }
  }

  const blogPosts = (
    await Promise.all(blogSourceFiles.map(doProcessBlogSourceFile))
  ).filter(Boolean) as BlogPost[];

  blogPosts.sort(
    (a, b) => b.metadata.date.getTime() - a.metadata.date.getTime(),
  );

  if (options.sortPosts === 'ascending') {
    return blogPosts.reverse();
  }
  return blogPosts;

View on GitHub (pinned to 3f483e80e3)

Solutions

Read err.cause for the real underlying error and fix that.
Open the blog source file printed in the message.
After fixing, re-run the build; processing is parallel so multiple posts may fail independently.

Defensive patterns

Strategy: try-catch

Try / catch

try {
  await processBlogSourceFile(...);
} catch (err) {
  const cause = (err as Error & {cause?: Error}).cause;
  console.error('Blog file failed:', cause ?? err);
  // fix per cause.message, then retry this file only
}

Prevention

Always read err.cause for wrapped processing errors.
Lint blog front matter locally before pushing.

When it happens

Trigger: Any failure while processing a single blog markdown/mdx file: bad front matter, missing author key, invalid slug, parse error, or a thrown validation error from authors/tags normalization. All such failures are funneled through this wrapper.

Common situations: A newly added blog post with malformed YAML, a removed author key referenced in front matter, or an invalid date/slug. CI fails with this message and the actual cause is in err.cause.

Related errors

AI-assisted analysis of facebook/docusaurus@3f483e80e3 (2026-08-12). Data as JSON: /api/errors/3831d6dd7f967cd6. Report an issue: GitHub.