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WebAssembly
WASI
Rust2019–2026
WebAssembly / WASI

WASI

WebAssembly System Interface

52Distinct people
57Mentions
0Explicit recommenders
5.8KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

WebAssembly System Interface

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

Mentioned in the same Hacker News threads. That is not proof they are substitutes.

This week on Hacker News

Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 4:00:59 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year57 dated mentions

Observed mentions: 2019-06-01 02:23:09 UTC to 2026-08-13 14:37:56 UTC.

0510152019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 4 mentions; 0 submissions, 4 comments20192020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 7 mentions; 0 submissions, 7 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 3 mentions; 1 submissions, 2 comments2022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 14 mentions; 0 submissions, 14 comments20222023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 10 mentions; 1 submissions, 9 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 7 mentions; 1 submissions, 6 comments2025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 7 mentions; 0 submissions, 7 comments2026-01-01 00:00:00 UTC to 2027-01-01 00:00:00 UTC (exclusive): 5 mentions; 2 submissions, 3 comments. Incomplete calendar period.2026*

* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC404
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC707
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC312
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC14014
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC1019
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC716
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC707
2026 (partial)2026-01-01 00:00:00 UTC2027-01-01 00:00:00 UTC523

From the project README

An excerpt from the repository, fetched Nov 13, 2026.

Read the project’s introduction
WebAssembly System Interface The WebAssembly System Interface (WASI) is a set of APIs for WASI being developed for eventual standardization by the WASI Subgroup, which is a subgroup of the WebAssembly Community Group. WASI started with launching what is now called Preview 1, an API using the witx IDL, and it is now widely used. Its major influences are POSIX and CloudABI. WASI 0.2 (Preview 2) is a modular collection of APIs defined with the Wit IDL, incorporating many of the lessons learned from WASI 0.1, including support for a wider range of source languages, modularity, a more expressive type system, and virtualizability. WASI 0.3 (Preview 3) is the current preview. It builds on WASI 0.2, replacing the earlier explicit streams and polling interfaces with the component model's native, composable async functionality via the future and stream types. Find the APIs Development of each API happens in its own repo, which you can access from the proposals list. This repo is for general discussion, as well as documenting how we work and high-level goals. Propose a new API If you would like to create a new proposal, get started with our Contributing guide. All new API proposals should use the new format and the new repo structure that is shown in the proposal template. See the Wit in WASI document for more information about using Wit for WASI proposals.
Read the full README on GitHub

What Hacker News says

7 sources
Since I have your ear, in hindsight do you think the promotion of IndexedDB over SQLite/WebSQL was a good move? I think persistent SQLite is on the verge of returning to the browser via WebAssembly but it needs a proper POSIX-like WASI [1] (WebAssembly System Interface) implementation in the browser. If you are looking for (very) small footholds in the market for Brave, a WASI implementation supporting a SQLite VFS [2] extension has my vote. [1] https://github.com/WebAssembly/WASI [2] https://www.sqlite.org/vfs.html
In Firefox Was Always Enough
Er... did you reply with your sock puppet by accident [1] [2]? If so that's kind of frowned on here, especially if you were using it to vote. I'm totally willing to entertain arguments that the Bytecode Alliance are also acting in bad faith. It's a harsh world and open source is not all unicorns and rainbows. But you can't just brush off the trademark issue by claiming it was unintentional. Especially when what you write here doesn't fit well with what you've written elsewhere [3]. I've gotten trademarks through lawyers before and the level of detail was an intense experience. You seem to be claiming your lawyers independently decided to trademark WebAssembly and you signed the pages without reading them? At least that's what I can put together from your vague writing about it. If you're not willing to give a concrete step by step post mo
Read the rest
rtem of how such a clusterfuck happened, the community should (and I'm sure does) feel at liberty to not believe you in the slightest. You don't owe them an explanation, they don't owe you their trust. You're clearly good at technology, better than me I'm sure, and I'm no slouch. You're doing impressive work and I have no wish to downplay that. But you appear to be quite bad at getting along with people. Maybe you can make your business work without developing that skill, and if that's your plan then best of luck to you. Sincerely. [1] https://i.imgur.com/TPBH9EH.png [2] https://news.ycombinator.com/item?id=19515476 [3] https://github.com/WebAssembly/WASI/issues/3#issuecomment-71...
In Fastly hires entire Wasmtime team from Mozilla
Some context from that thread I find important (I’m a bystander not involved in any way): > We would need to work with a lawyer to determine the IP issues around this. It’s possible that just using the same policy as for the WebAssembly logo works, but I know that various organizations have grown more concerned about IP in this space since then. > This is in no small part because your company, Wasmer, attempted to register “WebAssembly” and “Wasm” as trademarks. The USPTO rejected the application, but I don’t think we can assume that attempts to register a brandmark for a WASI logo would be similarly rejected. This doesn’t seem to be a he said she said situation; gp had the chance to defend himself and all he could come up was a very weak “The trademark requests were driven by our lawyers” (and what came after that was even more shameless
Read the rest
if you ask me): https://github.com/WebAssembly/WASI/issues/3#issuecomment-71... Given that context, I’d say the gp comment (especially the “personal bias” part) is likely motivated smearing. Bottom line: don’t make up your mind just because it’s the top comment of an HN thread, or because the discrimination/racism card is played (racism card isn’t played here, it’s in the linked GH issue). If you want to form an opinion, read the other side first.
In Fastly hires entire Wasmtime team from Mozilla
I have mixed feelings about this. In one side, I'm happy that some of the people affected by the Mozilla layoffs have now secured a job. On the other side, now almost all the power of the WASI standard is concentrated into the Fastly corporation (with wider penetration thanks to the WASI integration in Rust). The main and only player of the Bytecode Alliance becomes Fastly as well (as Mozilla is out of the server-side Wasm game). So... how this could be bad? The Bytecode Alliance has been biased since their inception, blocking any attempt of collaboration from Wasmer based on personal bias (I work at Wasmer) and other external entities out of their control [1] [2] [3]. This move is conceding them now a full-control over a standard such as WASI, placing the whole standard at risk [4] [1] https://twitter.com/syrusakbary/status/1202351432050
Read the rest
In Fastly hires entire Wasmtime team from Mozilla

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