Cross Runtime Tests

This repository contains a curated collection of reproducible test cases that expose behavioral differences across JavaScript runtimes such as:

• Node.js
• Bun
• Deno

The goal is to document and validate discovered cross runtime inconsistencies, especially edge cases that often surface in real-world applications but are inconsistently implemented across runtimes.

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Purpose

Modern JavaScript runtimes often diverge in subtle but important ways:

• Error timing (sync vs async)
• Node API compatibility gaps
• File system semantics
• Networking edge cases
• Crypto and encoding behavior
• Stream and buffer handling

This repository captures those differences, that were reported as actual issues to runtime maintainers.

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Structure

Each test file:

• Is self-contained
• Demonstrates a single behavioral difference
• Includes expected vs actual output
• Can be executed independently across runtimes
• Contains a link to actual reported issue

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Working

1. Navigate to tests/
2. Install relevant packages using npm install command
3. You are good to go. Run all tests using:

node --test
deno test -A
bun test

OR

Run individual tests using:

node --test <filename>
deno test -A <filename>
bun test <filename>