Zarrita-compatible codec implementations shared across projects:

• Blosc2Codec — blosc2 / numcodecs.blosc2 bytes-to-bytes codec, decoding Blosc2 chunks by reframing them as Blosc1 and delegating to zarrita's built-in blosc codec
• Fletcher32Codec — numcodecs.fletcher32 checksum codec
• GribscanRawGribCodec — numcodecs.gribscan.rawgrib raw GRIB1/GRIB2 decoder
• LogBinsCodec — numcodecs.log_bins array-to-array quantization codec

Only decode() (reading) is implemented; write-operations via encode() are currently not supported.

Register the codecs on a zarrita registry the same way you would any other codec:

import { registry } from "zarrita";
import {
  Blosc2Codec,
  Fletcher32Codec,
  GribscanRawGribCodec,
  LogBinsCodec,
} from "codecita";

registry.set("blosc2", async () => Blosc2Codec);
registry.set("numcodecs.blosc2", async () => Blosc2Codec);
registry.set("numcodecs.fletcher32", async () => Fletcher32Codec);
registry.set("numcodecs.gribscan.rawgrib", async () => GribscanRawGribCodec);
registry.set("numcodecs.log_bins", async () => LogBinsCodec);

Each codec also has its own entry point, so you can load it without importing the other codecs:

import { Blosc2Codec } from "codecita/blosc2";
import { Fletcher32Codec } from "codecita/fletcher32";
import { GribscanRawGribCodec } from "codecita/gribscan";
import { LogBinsCodec } from "codecita/logBins";

The blosc2 entry point requires zarrita at runtime. The other codec entry points do not import zarrita at runtime.

Use a dynamic import to load a codec when zarrita requests it:

import { registry } from "zarrita";

registry.set(
  "numcodecs.fletcher32",
  async () => (await import("codecita/fletcher32")).Fletcher32Codec
);

• npm run build — compiles src to dist
• npm test — runs the vitest suite against src
• npm run lint / npm run lint:fix — eslint
• npm run format / npm run format:check — prettier
• npm run typecheck — tsc --noEmit

• Blosc2Codec reframes chunks per the Blosc2 chunk format documented by the Blosc development team.
• LogBinsCodec is a TypeScript port of the log_bins codec from the Chalmers Cloud Ice Climatology (CCIC) project.
• GribscanRawGribCodec reimplements the raw GRIB1/GRIB2 decoding used by gribscan/gribscan.

All codec implementations are mostly vibe coded.