Egonex-AI/Understand-Anything · error

File disappeared while preparing incremental update: ${fileP

Error message

File disappeared while preparing incremental update: ${filePath}

What it means

analyzeInventoryChanges compares git-changed paths against the freshly captured fingerprint scan. Every path the diff reports as changed must exist in currentFingerprints; if it is absent the file vanished between the diff and the scan, making the incremental delta unsound, so the tool aborts rather than produce a wrong graph.

Source

Thrown at understand-anything-plugin/skills/understand/prepare-incremental.mjs:343

function analyzeInventoryChanges({
  currentChangedPaths,
  currentFingerprints,
  oldFingerprints,
  oldInventory,
  deletedFiles,
}) {
  const oldInventorySet = new Set(oldInventory);
  const fileChanges = [];
  const newFiles = [];
  const structurallyChangedFiles = [];
  const cosmeticOnlyFiles = [];
  const unchangedFiles = [];

  for (const filePath of currentChangedPaths) {
    const current = currentFingerprints.files[filePath];
    if (!current) {
      throw new Error(`File disappeared while preparing incremental update: ${filePath}`);
    }
    const previous = oldFingerprints.files[filePath];
    if (!oldInventorySet.has(filePath)) {
      newFiles.push(filePath);
      fileChanges.push({ filePath, changeLevel: 'STRUCTURAL', details: ['new file'] });
      continue;
    }
    if (!previous) {
      structurallyChangedFiles.push(filePath);
      fileChanges.push({
        filePath,
        changeLevel: 'STRUCTURAL',
        details: ['no fingerprint baseline — conservative classification'],
      });
      continue;
    }
    const result = compareFingerprints(previous, current);
    fileChanges.push(result);

View on GitHub (pinned to 07edf82a04)

Solutions

1. Re-run prepare-incremental.mjs — the race is usually transient
2. Commit or clean up any in-flight file deletions/moves before running
3. Ensure no other process (build, formatter, sync tool) mutates the working tree during preparation
4. If the file was genuinely deleted, use a fresh full analysis instead of incremental

Example fix

// before
if (!current) {
  throw new Error(`File disappeared while preparing incremental update: ${filePath}`);
}
// after
if (!current) {
  console.warn(`Skipping vanished file: ${filePath}`);
  continue;
}

const changedPaths = getChangedPaths(baseCommit);
const missing = changedPaths.filter(p => !fs.existsSync(path.join(projectRoot, p)));
if (missing.length > 0) throw new Error(`Files vanished before incremental prep: ${missing.join(', ')}`);

function fileInScan(scan, filePath) { return Boolean(scan?.files && Object.prototype.hasOwnProperty.call(scan.files, filePath)); }

try {
  await prepareIncremental(args);
} catch (err) {
  if (String(err.message).startsWith('File disappeared')) {
    await new Promise(r => setTimeout(r, 1000));
    return prepareIncremental(args); // retry once, files may have settled
  }
  throw err;
}

When it happens

Trigger: A file is listed in currentChangedPaths (from the git diff) but is missing from currentFingerprints.files — typically because the file was deleted or renamed on disk after the diff was captured but before/while fingerprinting, or an exclude pattern mismatch removed it from the scan.

Common situations: Concurrent edits by another process/IDE during incremental preparation, running the tool while a build or formatter is actively deleting/moving files, or a race between git diff and the file scan in a large repo.

Understand the failure class

Background: "File not found" and ENOENT errors: why libraries can't find a file that should exist — this error's family across 50 libraries.

Related errors

• Unable to remove temporary benchmark artifacts
• Repository path does not exist: ${repoValue}
• Repository path is not a directory: ${repoValue}
• --output must be outside the subject repository
• Markdown report path must be outside the subject repository

AI-assisted analysis of Egonex-AI/Understand-Anything@07edf82a04 (2026-09-07). Data as JSON: /api/errors/8508a220b7250678. Report an issue: GitHub.