oven-sh/bun · error · Error

Expected packages to be an array

Error message

Expected packages to be an array

What it means

Error "Expected packages to be an array" thrown in oven-sh/bun.

Source

Thrown at src/install/PackageManager/scanner-entry.ts:50

// Read packages JSON from fd 4 (reads until EOF when parent closes the pipe)
let packages: Bun.Security.Package[];
let packagesJson: string = "";

try {
  packagesJson = await Bun.file(IPC_INPUT_FD).text();
} catch (error) {
  const message = `Failed to read packages from FD ${IPC_INPUT_FD}: ${error instanceof Error ? error.message : String(error)}`;
  sendAndExit({
    type: "error",
    code: "SCAN_FAILED",
    message,
  });
}

try {
  packages = JSON.parse(packagesJson);
  if (!Array.isArray(packages)) {
    throw new Error("Expected packages to be an array");
  }
} catch (error) {
  const message = `Failed to parse packages JSON: ${error instanceof Error ? error.message : String(error)}`;
  sendAndExit({
    type: "error",
    code: "SCAN_FAILED",
    message,
  });
}

let scanner: Bun.Security.Scanner;

try {
  scanner = (await import(scannerModuleName)).scanner;
} catch (error) {
  if (typeof error === "object" && error !== null && "code" in error && error.code === "ERR_MODULE_NOT_FOUND") {
    if (!suppressError) {
      const msg = `\x1b[31merror: \x1b[0mFailed to import security scanner: \x1b[1m'${scannerModuleName}'`;

View on GitHub (pinned to 8c5296ac45)

When it happens

Trigger: Thrown at src/install/PackageManager/scanner-entry.ts:50 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of oven-sh/bun@8c5296ac45 (2026-08-16). Data as JSON: /api/errors/bf59d2a9dec1197b. Report an issue: GitHub.