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Developer weekly update June 18, 2025

June 18, 2025

Hello developers, and welcome to this week's developer weekly update! This week, there are new releases of the stable-structures library and Canbench, plus a new feature for auto-adding cycles to calls to the management canister. Let's get started!

stable-structures v0.6.9​

A new release of the stable-structures library has been published! This release includes dozens of changes and updates. Here are some of the highlights:

  • Performance improvements for read-heavy cases other smaller performance upgrades.

  • New BTreeSet structure.

  • Initial publication of the Stable Structures Book.

  • Improved benchmarks.

  • CI and codebase improvements.

Read the full release notes.

Canbench v0.2.0​

Alongside the new stable-structures library, a new version of Canbench has also been released. Highlights of v0.2.0 include:

  • Cleaner benchmark output.

  • Summary reports that show final status, total benchmarks, improvements, regressions, etc.

  • Support for CSV reports through --csv flag.

  • GitHub CI integration scripts.

Read the full details on the developer forum.

Automatic cycles attachment to management canister calls​

Motoko package ic v2.1.0 has an exciting new feature: Automatic cycle calculation!

For example, instead of hardcoding cycles amounts:

await (with cycles = 230_949_972_000) IC.http_request(args)

Now, you can use:

import IC "mo:ic/Call";
...
await IC.httpRequest(args)

This will calculate the minimum amount of cycles needed and automatically attach them to the call.

Learn more in the ic Mops package documentation.

That'll wrap up this week. Tune back in next week for more developer updates!

-DFINITY