tonhowtf/omniget · error · Error

CompressionStream indisponível neste runtime

Error message

CompressionStream indisponível neste runtime

What it means

Capability guard in compressForUrl: the globalThis.CompressionStream API is missing in the current runtime (older browser or non-secure context), so the PlantUML text cannot be deflate-compressed for an encoded server URL.

Solutions

1. Feature-detect CompressionStream before offering the encoded-URL rendering path
2. Fall back to sending the raw (uncompressed) PlantUML source to the server
3. Polyfill CompressionStream (e.g. via a wasm deflate implementation) for runtimes that lack it

When it happens

Trigger: Thrown at src/lib/study-components/notes/PlantumlView.svelte:119 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tonhowtf/omniget@8600b91f42 (2026-09-12). Data as JSON: /api/errors/b0af1f7e0e2ddeaa. Report an issue: GitHub.

Appendix: source

Thrown at src/lib/study-components/notes/PlantumlView.svelte:119

      const c1 = b1 >> 2;
      const c2 = ((b1 & 0x3) << 4) | (b2 >> 4);
      const c3 = ((b2 & 0xf) << 2) | (b3 >> 6);
      const c4 = b3 & 0x3f;
      result +=
        PLANT_ALPHABET[c1 & 0x3f] +
        PLANT_ALPHABET[c2 & 0x3f] +
        PLANT_ALPHABET[c3 & 0x3f] +
        PLANT_ALPHABET[c4 & 0x3f];
    }
    return result;
  }

  async function compressForUrl(text: string): Promise<string> {
    const G = globalThis as unknown as {
      CompressionStream?: new (format: string) => GenericTransformStream;
    };
    if (!G.CompressionStream) {
      throw new Error("CompressionStream indisponível neste runtime");
    }
    const ds = new G.CompressionStream("deflate-raw");
    const stream = new Blob([text]).stream().pipeThrough(ds);
    const compressed = await new Response(stream).arrayBuffer();
    return deflateBase64(new Uint8Array(compressed));
  }

  async function renderRemote(src: string) {
    const token = ++renderToken;
    const trimmed = src.trim();
    if (!trimmed) return;
    renderState = { kind: "remote-rendering" };
    try {
      const encoded = await compressForUrl(trimmed);
      if (token !== renderToken) return;
      const url = `https://www.plantuml.com/plantuml/svg/~1${encoded}`;
      const resp = await fetch(url);
      if (!resp.ok) {

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