Something went wrong. Try again.
Monorepo for Tangled tangled.org
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748import { 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 goodconst 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: "shiki-js" }); 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("uses oniguruma even when a caller asks for the js engine", async () => { expect(await tokenizesWithin(BACKTRACKING_GO, 10_000)).toBe(true); }, 15_000);});