iiinova — where your digital self keeps evolving

Chris Cook @zirkelc.dev · 28/07/2025

TIL you can use `@entity.Attributes.Lambda.Function` to group messages from multiple different log groups. Useful when you need to analyze cold starts from many Lambdas with a single cloudwatch query.

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Chris Cook @zirkelc.dev · 26/07/2025

Thanks for the article, I learned so many new things! I noticed you're using Date.now() for measuring; maybe using Node.js performance hooks will give you even more accurate numbers? nodejs.org/api/perf_hoo...

nodejs.org

Performance measurement APIs | Node.js v24.4.1 Documentation

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Chris Cook @zirkelc.dev · 10/07/2025

I'm already working on improvements like auto-generated tags and summaries, and tougher CSP work-arounds. Check out the code and give it a star! ⭐ github.com/zirkelc/lambdalet

github.com

GitHub - zirkelc/lambdalet: Lambdalet.AI: Reinventing the bookmarklet.

Lambdalet.AI: Reinventing the bookmarklet. Contribute to zirkelc/lambdalet development by creating an account on GitHub.

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Chris Cook @zirkelc.dev · 10/07/2025

Flow in a nutshell: 1️⃣ Lambda #1 uploads the HTML to S3 and queues requests 2️⃣ SQS FIFO for async processing and deduplication 3️⃣ Lambda #2 downloads HTML, converts to Markdown, extracts content via Bedrock and saves to Notion

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Chris Cook @zirkelc.dev · 10/07/2025

Bookmarklets are back! 🔖 It uses a small JS snippet saved as a bookmark to POST the current page's HTML to an API Gateway. If a site’s CSP blocks fetch, the code falls back to an old-school form submit in a temp window. Simple trick, but it works on most pages.

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Chris Cook @zirkelc.dev · 10/07/2025

Here's Lambdalet.AI - an AI-powered bookmarking and read-it-later service. It saves any page you're reading into your own Notion database — full text, fully searchable, zero fuss. I built this for the AWS Lambda Hackathon!

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Chris Cook @zirkelc.dev · 18/06/2025

If your using JSONata instead of JSONPath for your AWS Step Function workflow, here's how you can flatten an array of arrays:

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Chris Cook @zirkelc.dev · 11/06/2025

It would be nice if there was a way to pause Lambdas while waiting for a HTTP response. Like fire of a few requests, the Lambda goes into hibernate and automatically resumes when all requests have concluded.

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Chris Cook @zirkelc.dev · 09/06/2025

Using a reasoning model for coding feels like driving a sports car in stop-and-go traffic

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Chris Cook @zirkelc.dev · 27/05/2025

Long lived AWS IAM credentials for the management console would be nice

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Chris Cook @zirkelc.dev · 20/04/2025

In 2011, there was an proposal to change the type of null `typeof null === null` Too bad it didn't get accepted web.archive.org/web/20160331...

web.archive.org

harmony:typeof_null [ES Wiki]

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Chris Cook @zirkelc.dev · 11/04/2025

Cool, I always skipped over this section in the docs. Would be nice if it were possible to configure on a complete test() block like test.soft()

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Chris Cook @zirkelc.dev · 18/03/2025

Found this TODO in my codebase 😄 If I make a PR, will @vitest.dev accept it? 👀

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Chris Cook @zirkelc.dev · 12/03/2025

I started a discussion for a new asymmetric matcher for @vitest.dev that checks if a property does not exist. Basically, the opposite of `expect.anything()`, could be named `expect.nothing()` Would love to get some feedback 🙏 github.com/vitest-dev/v...

github.com

Asymmetric matcher for property NOT exists (opposite of `anything`) · vitest-dev vitest · Discussion #7324

Hey, is there a way check if an object does not have a certain property? Basically, the opposite of expect.anything(): import { expect, test } from 'vitest' test('object has "apples" key', () => { ...

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Chris Cook @zirkelc.dev · 02/02/2025

TIL `$*` captures all positional arguments into a space separated string You can abuse this for a Git alias to avoid typing the commit message in double quotes: `gc my commit message`

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Chris Cook @zirkelc.dev · 31/01/2025

I can't emphasize enough how great this post about quantization is!

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Chris Cook @zirkelc.dev · 29/01/2025

It's funny, @sindresorhus.bsky.social has a package for literally everything I search for. I should probably prefix my Google searches with "site:github.com/sindresorhus/"

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Chris Cook @zirkelc.dev · 29/01/2025

Is distilling the same as fine-tuning? Sounds like the only difference is that in distillation, the data comes from a bigger model instead of a human

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Chris Cook @zirkelc.dev · 29/01/2025

I hope they will win at the end

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Chris Cook @zirkelc.dev · 28/01/2025

Great explanation! 🙏

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Chris Cook @zirkelc.dev · 27/01/2025

Building and deploying a React app to a static hosting service like Amazon S3 and CloudFront is a good example for a CLI in TypeScript. Adding Listr2 and Execa to create an easily extensible CLI with `build` and `deploy` command. asciinema.org/a/DFlVSxmoWD...

asciinema.org

untitled

Recorded by zirkelc

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Chris Cook @zirkelc.dev · 24/01/2025

It’s like Turborepo?

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Chris Cook @zirkelc.dev · 24/01/2025

It's so funny how confident LLMs are when they make mistakes. The model generates invalid code. You specifically ask them about lines of code. The model confidently explains how it works. You give them the error. The model is like "Ah, you're absolutely right - I apologize for my mistake!"

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Chris Cook @zirkelc.dev · 24/01/2025

I also noticed this awhile ago and couldn’t wrap my head around it 😄 but it’s great that it works

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Chris Cook @zirkelc.dev · 23/01/2025

What if `expect(obj).toMatchPrompt("...")` was a thing It's probably a stupid idea, but I couldn't resist and quickly implemented @vitest.dev custom matcher

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Chris Cook @zirkelc.dev · 21/01/2025

What's the reason for switching?

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Chris Cook @zirkelc.dev · 20/01/2025

I wish VSCode would accept S3 URLs Cmd+P, paste S3 URL, enter and it opens the file

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Chris Cook @zirkelc.dev · 18/01/2025

I love how you can use TypeScripts' unique symbols as a parking spot for types 👀 Here's a simple query helper function to attach the result type to an object and infer it back later I've shared a complete example on @dev.to: dev.to/zirkelc/uniq...

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Chris Cook @zirkelc.dev · 18/01/2025

What you do with TypeScript is pure magic 😄

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Chris Cook @zirkelc.dev · 16/01/2025

First time I heard the term „Chat-driven“ development 😄

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Chris Cook @zirkelc.dev · 16/01/2025

Linkt to the repo: github.com/vercel/ms/bl...

github.com

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Chris Cook @zirkelc.dev · 16/01/2025

I noticed that Vercels' popular `ms` pkg for converting time units to milliseconds uses 365.25 as a multiplier for the days in a year. I know this is to account for leap years, but is that the right assumption to make here? Effectively this means that `ms(1y) != ms(365d)` without ppl knowing it

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Chris Cook @zirkelc.dev · 15/01/2025

Here's @tkdodo.eu original post where I saw this pattern for the first time. It's also the first time that using TypeScripts' `unqiue symbol` has made any sense to me. tkdodo.eu/blog/the-que...

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Chris Cook @zirkelc.dev · 15/01/2025

Inspired by React Query's `queryOptions()`, I made a little helper to add the type of the parameter and the return type to the query definition (yes, I know about ORM). The next step would be to use template literal types to parse the parameters and return type from the query string.

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Chris Cook @zirkelc.dev · 15/01/2025

I just stumbled upon `unbuild` from @unjs.io Bundling for ESM and CJS is already super easy thanks to `tsup`, but `unbuild` looks even nicer! github.com/unjs/unbuild

github.com

GitHub - unjs/unbuild: 📦 A unified JavaScript build system

📦 A unified JavaScript build system. Contribute to unjs/unbuild development by creating an account on GitHub.

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Chris Cook @zirkelc.dev · 13/01/2025

Oh that’s actually a great idea!

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