In this article, we review attw script in CopilotKit codebase. You will learn:

1. What is attw?

2. attw script in CopilotKit

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What is attw?

attw is a CLI for arethetypeswrong.github.io..This project attempts to analyze npm package contents for issues with their TypeScript types, particularly ESM-related module resolution issues. The following kinds of problems can be detected in the node10, node16, and bundler module resolution modes:

💀 Resolution failed.

❌ No types.

🎭 Masquerading as CJS.

👺 Masquerading as ESM.

⚠️ ESM (dynamic import only).

🐛 Used fallback condition.

🤨 CJS default export.

❗️ Incorrect default export.

❓ Missing export =.

🚭 Unexpected module syntax.

🥴 Internal resolution error.

🕵️‍♂️ Named exports.

Below is a check I ran on my npm package, thinkthroo and these were the issues found

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attw script in CopilotKit

Since now that we understand what attw does, let’s review how CopilotKit uses this in the package.json script.

I the CopilotKit/packages/agentcore-runner/package.json,. you will find the below code nsippet:

"scripts": {
 ...
 "attw": "attw --pack . --profile node16"
 },

This has two arguments/options/flags passed.

• pack

Specify a directory to run npm pack in (instead of specifying a tarball filename), analyze the resulting tarball, and delete it afterwards.

attw --pack .

• profile

Profiles select a set of resolution modes to require/ignore. All are evaluated but failures outside of those required are ignored.

The available profiles are:

• strict - requires all resolutions

• node16 - ignores node10 resolution failures

• esm-only - ignores CJS resolution failures

In the CLI: --profile

The script in CopilotKit ignores the node10 resolution failures.

About me:

Hey, my name is ramunarasinga. Email: ramunarasinga@gmail.com

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References:

1. package/@arethetypeswrong/cli.

2. CopilotKit/packages/agentcore-runner/package.json#L27.

3. arethetypeswrong.github.io.