oven-sh/bun · error · Error

Mismatch

Error message

Mismatch

What it means

A discovered workspace member's package.json has no usable "name": the `name` key is missing or its value is not a string (src/install/lockfile/Package/WorkspaceMap.rs:147-153). Every directory matched by the workspaces globs must expose a named package.json.

Source

Thrown at bench/scanner/scan.node-esbuild.mjs:22

const ITERATIONS = parseInt(process.env.ITERATIONS || "1") || 1;

const opts = {
  metafile: true,
  format: "esm",
  platform: "neutral",
  write: false,
  logLevel: "silent",
  stdin: {
    contents: readFileSync("remix-route.ts", "utf8"),
    loader: "ts",
    sourcefile: "remix-route.js",
  },
};

const getExports = ({ metafile }) => {
  for (let i = 0; i < fixture.length; i++) {
    if (fixture[i] !== metafile.outputs["stdin.js"].exports[i]) {
      throw new Error("Mismatch");
    }
  }
};

console.time("Get exports");

if (!process.env.SYNC) {
  var promises = new Array(ITERATIONS);
  for (let i = 0; i < ITERATIONS; i++) {
    promises[i] = build(opts).then(getExports);
  }

  await Promise.all(promises);
} else {
  for (let i = 0; i < ITERATIONS; i++) {
    getExports(buildSync(opts));
  }
}

View on GitHub (pinned to 8c5296ac45)

Solutions

1. Add a unique string `name` to the offending workspace's package.json (the install log names the file)
2. Or narrow the workspaces glob so the folder is not matched
3. Or remove/rename the stray package.json if the folder is not a workspace

Example fix

// before (apps/docs/package.json)
{ "private": true }

// after
{ "name": "@acme/docs", "private": true }

import { readFileSync } from "node:fs";
function workspacesAreNamed(globs) {
  for (const g of globs) {
    for (const dir of new Bun.Glob(g.replace(/\/package\.json$/, "")).scanSync(".")) {
      const pkg = JSON.parse(readFileSync(`${dir}/package.json`, "utf8"));
      if (typeof pkg.name !== "string" || pkg.name === "") return false;
    }
  }
  return true;
}

const isNamedWorkspace = (pkg) => typeof pkg?.name === "string" && pkg.name.length > 0;

When it happens

Trigger: `bun install` scanning workspaces globs that match a folder whose package.json lacks `name` (e.g. a leftover scaffolding dir, an examples/docs folder, or a name set to a non-string).

Common situations: Adding broad globs like "apps/*" or "**" that sweep in folders not meant to be workspaces; committing half-created packages; JSON with `"name": 123`.

Related errors

• blob.text() failed
• page-cache eviction failed for ${path}; results would be war
• size mismatch
• not called
• not 200

AI-assisted analysis of oven-sh/bun@8c5296ac45 (2026-08-16). Data as JSON: /api/errors/72d6d42a49fdd44d. Report an issue: GitHub.