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Monorepo for Tangled tangled.org
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849import { Worker } from "node:worker_threads";import { describe, expect, it } from "vitest";
// shiki's js regex engine backtracks without end on this go struct literal. on the// server each blob page with it pinned an instance's event loop for good; highlights'// hand-written lexers have no regex engine to run awayconst BACKTRACKING_GO = 'pp := struct {\n\t}{t(*p), strings.TrimSuffix(p.URL.String(), "/")}\n';
// a runaway regex can't be interrupted on its own thread, so this tokenizes in a// worker and terminates it at the deadlineconst WORKER = `const { parentPort, workerData } = require("node:worker_threads");import(workerData.pierre).then(async ({ getSharedHighlighter, registerCustomCSSVariableTheme }) => { registerCustomCSSVariableTheme("test", { background: "#ffffff", foreground: "#000000" }); const highlighter = await getSharedHighlighter({ themes: ["test"], langs: ["go"], preferredHighlighter: "highlights" }); highlighter.codeToTokens(workerData.code, { lang: "go", theme: "test" }); parentPort.postMessage("done");});`;
const tokenizesWithin = (code: string, ms: number): Promise<boolean> => new Promise((resolve, reject) => { const worker = new Worker(WORKER, { eval: true, workerData: { pierre: import.meta.resolve("@pierre/diffs"), code } }); const finish = (done: boolean) => { clearTimeout(timer); void worker.terminate(); resolve(done); }; const timer = setTimeout(() => finish(false), ms); worker.once("message", () => finish(true)); worker.once("error", (err) => { clearTimeout(timer); reject(err); }); });
describe("shared highlighter on the server", () => { it("tokenizes the backtracking go literal with highlights", async () => { expect(await tokenizesWithin(BACKTRACKING_GO, 10_000)).toBe(true); }, 15_000);});