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fix(telegram): chunk long html outbound messages (#42240)

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Merged via squash.

Prepared head SHA: 4d79c41ddf
Co-authored-by: obviyus <22031114+obviyus@users.noreply.github.com>
Co-authored-by: obviyus <22031114+obviyus@users.noreply.github.com>
Reviewed-by: @obviyus
This commit is contained in:
Ayaan Zaidi
2026-03-10 22:53:04 +05:30
committed by GitHub
parent 8bf64f219a
commit 3b582f1d54
5 changed files with 519 additions and 48 deletions
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24
src/telegram/format.test.ts
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@@ -1,5 +1,5 @@
import { describe, expect, it } from "vitest";
import { markdownToTelegramHtml } from "./format.js";
import { markdownToTelegramHtml, splitTelegramHtmlChunks } from "./format.js";
describe("markdownToTelegramHtml", () => {
it("handles core markdown-to-telegram conversions", () => {
@@ -112,4 +112,26 @@ describe("markdownToTelegramHtml", () => {
expect(res).toContain("<tg-spoiler>secret</tg-spoiler>");
expect(res).toContain("trailing ||");
});
it("splits long multiline html text without breaking balanced tags", () => {
const chunks = splitTelegramHtmlChunks(`<b>${"A\n".repeat(2500)}</b>`, 4000);
expect(chunks.length).toBeGreaterThan(1);
expect(chunks.every((chunk) => chunk.length <= 4000)).toBe(true);
expect(chunks[0]).toMatch(/^<b>[\s\S]*<\/b>$/);
expect(chunks[1]).toMatch(/^<b>[\s\S]*<\/b>$/);
});
it("fails loudly when a leading entity cannot fit inside a chunk", () => {
expect(() => splitTelegramHtmlChunks(`A&amp;${"B".repeat(20)}`, 4)).toThrow(/leading entity/i);
});
it("treats malformed leading ampersands as plain text when chunking html", () => {
const chunks = splitTelegramHtmlChunks(`&${"A".repeat(5000)}`, 4000);
expect(chunks.length).toBeGreaterThan(1);
expect(chunks.every((chunk) => chunk.length <= 4000)).toBe(true);
});
it("fails loudly when tag overhead leaves no room for text", () => {
expect(() => splitTelegramHtmlChunks("<b><i><u>x</u></i></b>", 10)).toThrow(/tag overhead/i);
});
});