Runtime evidence / smoke tested

socket.io4.8.4

Observed 2026-10-09 14:49 UTC · Linux amd64 / glibc

Download JSON

Version summary · Observation 0 · Report history · Maintainer tools (coming soon)

Passed

All applicable planned loading observations completed.

This is loading evidence. It does not establish functional correctness or package safety.

Runtime matrix

4 pinned runtimes · production_ab51508deb208994caf81cb80f14b800

Loading outcomes by runtime and consumer mode
Runtime	Root import	Root require	Subpath imports	Subpath requires
Node.js24.21.0	Passed	Passed	Not applicable0 passed · 0 failed	Not applicable0 passed · 0 failed
Node.js26.10.0	Passed	Passed	Not applicable0 passed · 0 failed	Not applicable0 passed · 0 failed
Bun1.4.2	Passed	Passed	Not applicable0 passed · 0 failed	Not applicable0 passed · 0 failed
Deno2.9.7	Passed	Passed	Not applicable0 passed · 0 failed	Not applicable0 passed · 0 failed

Node.js 24.21.0

Root importPassed

Root requirePassed

Subpath importsNot applicable0 passed · 0 failed

Subpath requiresNot applicable0 passed · 0 failed

Node.js 26.10.0

Root importPassed

Root requirePassed

Subpath importsNot applicable0 passed · 0 failed

Subpath requiresNot applicable0 passed · 0 failed

Bun 1.4.2

Root importPassed

Root requirePassed

Subpath importsNot applicable0 passed · 0 failed

Subpath requiresNot applicable0 passed · 0 failed

Deno 2.9.7

Root importPassed

Root requirePassed

Subpath importsNot applicable0 passed · 0 failed

Subpath requiresNot applicable0 passed · 0 failed

Import uses ESM; require uses CommonJS. Root modes use fresh sandboxes. Subpath batches share module caches and globals. Select a result to inspect its evidence.

Does socket.io work in Node.js, Bun and Deno?

All applicable planned loading checks completed. The runtimes used the same installed dependency snapshot. Test environment: Linux amd64 / glibc, with install scripts and execution networking disabled. Successful import or require does not prove that package functions, native features or your application work.

Does socket.io work with Node.js?

socket.io@4.8.4 passed the applicable loading checks in Node.js 24.21.0. 2 passed · 0 failed.

socket.io@4.8.4 passed the applicable loading checks in Node.js 26.10.0. 2 passed · 0 failed.

Does socket.io work with Bun?

socket.io@4.8.4 passed the applicable loading checks in Bun 1.4.2. 2 passed · 0 failed.

Does socket.io work with Deno?

socket.io@4.8.4 passed the applicable loading checks in Deno 2.9.7. 2 passed · 0 failed.

Compare npm package compatibility across Node.js, Bun and Deno · Browse observed runtime loading failures

Shared preparation

Passed

21 installed packages · 0 optional dependencies omitted · lifecycle scripts disabled

The omitted count covers locked optional dependencies. Optional peers are separate and are not automatically installed.

Static manifest, native and script observations

Static indicators are context; their presence alone does not establish a prerequisite or failure.

{
  "native": {
    "count": 0,
    "paths": [],
    "buildIndicators": [],
    "prerequisiteProven": false
  },
  "declared": {
    "main": "./dist/index.js",
    "type": "commonjs",
    "engines": {
      "node": ">=10.2.0"
    },
    "exports": {
      ".": {
        "types": "./dist/index.d.ts",
        "import": "./wrapper.mjs",
        "require": "./dist/index.js"
      },
      "./package.json": "./package.json"
    },
    "scripts": {
      "test": "npm run format:check && npm run compile && npm run test:types && npm run test:unit",
      "compile": "rimraf ./dist && tsc",
      "prepack": "npm run compile",
      "test:unit": "nyc mocha --import=tsx --reporter spec --slow 200 --bail --timeout 10000 test/index.ts",
      "format:fix": "prettier --write \"lib/**/*.ts\" \"test/**/*.ts\"",
      "test:types": "exit 0",
      "format:check": "prettier --check \"lib/**/*.ts\" \"test/**/*.ts\""
    },
    "dependencies": {
      "cors": "~2.8.5",
      "debug": "~4.4.1",
      "accepts": "~1.3.4",
      "engine.io": "~6.6.0",
      "socket.io-parser": "~4.2.4",
      "socket.io-adapter": "~2.5.2"
    }
  },
  "platform": {
    "os": true,
    "cpu": true,
    "libc": true
  },
  "evidenceLevel": "static_only",
  "lifecycleScripts": []
}

Coverage and evidence

Node.js 24.21.0 · Root · ESM importPassed

1 passed · 0 failed · 1 observed of 1 planned

Evidence JSON

Node.js 24.21.0 · Root · CommonJS requirePassed

1 passed · 0 failed · 1 observed of 1 planned

Evidence JSON

Node.js 24.21.0 · Subpaths · ESM importNot applicable

0 passed · 0 failed · 0 observed of 0 planned

Evidence JSON

Node.js 24.21.0 · Subpaths · CommonJS requireNot applicable

0 passed · 0 failed · 0 observed of 0 planned

Evidence JSON

Node.js 26.10.0 · Root · ESM importPassed

1 passed · 0 failed · 1 observed of 1 planned

Evidence JSON

Node.js 26.10.0 · Root · CommonJS requirePassed

1 passed · 0 failed · 1 observed of 1 planned

Evidence JSON

Node.js 26.10.0 · Subpaths · ESM importNot applicable

0 passed · 0 failed · 0 observed of 0 planned

Evidence JSON

Node.js 26.10.0 · Subpaths · CommonJS requireNot applicable

0 passed · 0 failed · 0 observed of 0 planned

Evidence JSON

Bun 1.4.2 · Root · ESM importPassed

1 passed · 0 failed · 1 observed of 1 planned

Evidence JSON

Bun 1.4.2 · Root · CommonJS requirePassed

1 passed · 0 failed · 1 observed of 1 planned

Evidence JSON

Bun 1.4.2 · Subpaths · ESM importNot applicable

0 passed · 0 failed · 0 observed of 0 planned

Evidence JSON

Bun 1.4.2 · Subpaths · CommonJS requireNot applicable

0 passed · 0 failed · 0 observed of 0 planned

Evidence JSON

Deno 2.9.7 · Root · ESM importPassed

1 passed · 0 failed · 1 observed of 1 planned

Evidence JSON

Deno 2.9.7 · Root · CommonJS requirePassed

1 passed · 0 failed · 1 observed of 1 planned

Evidence JSON

Deno 2.9.7 · Subpaths · ESM importNot applicable

0 passed · 0 failed · 0 observed of 0 planned

Evidence JSON

Deno 2.9.7 · Subpaths · CommonJS requireNot applicable

0 passed · 0 failed · 0 observed of 0 planned

Evidence JSON

Planner omissions

pattern: 0
non executable: 1
not exported: 0
invalid subpath: 0
coverage limit: 0

./package.json — non executable

Reproduce these inputs

Download the recorded inputs and exact dependency lock. These files do not include the CLI, runtime images or installed packages.

Reproduction inputs Exact package lock

Local replay requires setup. The CLI currently runs from the CompatLab source repository on a qualified Linux amd64/runsc host. Hosted runtime images are not yet distributed for public download; an operator must supply the exact images named in this report. A fresh image build does not substitute for them. CLI setup and replay requirements

Command for a configured host

Run from the built CompatLab repository with both downloads in that directory and the exact runtime images loaded. Rebuilding creates a new snapshot generation.

sudo "$(command -v node)" apps/cli/dist/bin.js reproduce ./10855437-f1f8-47c5-8174-8f3bb2326d9c-reproduction.json --rebuild --lockfile ./package-lock.json --json

The original worker last reported its sealed snapshot as available. Verified reuse requires those actual bytes in your local state directory.

Exact provenance

artifact: socket.io@4.8.4
integrity: sha512-9ZV9zg8vN8hO3Y25DhR7nUkJ1VDnBhq5O/JrXhFT9s6+F0gqytSASTHVfCFc2mJXaTfARroErplXlzFWwETZqQ==
tarball: https://registry.npmjs.org/socket.io/-/socket.io-4.8.4.tgz
snapshot: 4a07339c-01d7-419e-9e63-25f073eba08e
generation: 82bad1e1-628e-4d9c-a5f7-c83ce02bfbc3
lockDigest: 24de355b2c54b05ce93e924edd2c8927fc9a36af1c7ad70fb3721cdc78553e8b
treeDigest: ad1aa164d64296fe127f5a2bcae08f8168083882ba086b7460c0c3df5242b5e1
installerImage: node:24.21.0-bookworm-slim@sha256:5cbc7caba8c2c0f0bca675d1b61b9f2857e1cf1853c6164ee9dd409501a936e7
preparationProfile: npm_11_19_0_linux_amd64_v2
harness: load_v2
planner: explicit_exports_v1
policy: runtime_limits_v2
classifier: classifier_v2
classifiedAt: 2026-10-09T14:49:05.582Z

node_24_21_0

sha256:f2fcbb4dfbd6d5f57f4e43de97e70182d9982ac7cc0cc063dfff2cf1759a411d

Built 2026-10-04 15:20 UTC · runtime_image_v1

node_26_10_0

sha256:9c1c93cc35d1408d26a61c4efccbde37c35425e362a2e723b885c3333d2be073

Built 2026-10-04 15:20 UTC · runtime_image_v1

bun_1_4_2

sha256:2343363679fb92d59a395ff081b783b5514f06295b1bc6d61baaeef17e793789

Built 2026-10-04 15:21 UTC · runtime_image_v1

deno_2_9_7

sha256:4292bb23555f98fb9dfc30fb447daa1c301686d89264fd8643ccb86bc0d53c29

Built 2026-10-04 15:21 UTC · runtime_image_v1

Evidence limitations

Only installation and loading were observed; functional correctness and package safety are not established.
Subpath batches share module caches and globals; root modes use separate fresh sandboxes.
Package-visible harness observations can be tampered with. They are not adversarial attestation.
Evidence applies to these exact artifacts, dependency snapshot, runtime images and Linux amd64/glibc policy.
Runtime error codes are captured observations and can also be thrown by package code.