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Pick any line to see why it is the way it is: the commit, the pull request and issue it came from, and what the agent was thinking.

Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate1import { waitUntil } from "cloudflare:workers";
2
Usage, Billing settings and prepaid AI credit; fixes from the UX audit3import type { Comparison } from "@g1t/contracts";
4
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate5import { type SharedCache, contentCache, weightOfLines } from "./content-cache";
6import { type FileHtml, type HighlightedComparison, type HighlightedFile, diffContent, htmlOfFile, withHtml } from "./diff";
Usage, Billing settings and prepaid AI credit; fixes from the UX audit7
Fast pages, required checks on the branch, self-hosted runners, honest incidents8// Shiki and its grammars load on the first file highlighted, not when the
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate9// Worker starts: most requests highlight nothing. The module is asked for
10// once per isolate.
11let shikiModule: Promise<typeof import("./shiki")> | undefined;
12const shiki = () => (shikiModule ??= import("./shiki"));
API and MCP server, Rust identity service, registration, site redesign13
14const MAX_HIGHLIGHT_CHARS = 200_000;
15
16/**
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate17 * Highlighting is most of the work of a file's page (about two thirds of a
18 * small file's, nine tenths of a large one's), and the same text always
19 * highlights the same way. So it is kept by a hash of the text and its
20 * language: in the isolate, and in the data centre's cache for the other
21 * isolates there (lib/content-cache.ts). A file read again on another
22 * branch or commit, through blame, or by the next crawler, is highlighted
23 * once. Bump `HIGHLIGHT_VERSION` when the theme, the grammars, Shiki or
24 * `linesToHtml` change what they make.
API and MCP server, Rust identity service, registration, site redesign25 */
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate26export const HIGHLIGHT_VERSION = "v1";
27
28function dataCentre(): SharedCache | null {
Agents as a team: lifecycle, merge queue, billing and a new shell29 try {
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate30 return (caches as unknown as { default: Cache }).default ?? null;
Agents as a team: lifecycle, merge queue, billing and a new shell31 } catch {
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate32 // No cache (local development).
Agents as a team: lifecycle, merge queue, billing and a new shell33 return null;
34 }
35}
36
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate37function defer(work: Promise<unknown>) {
38 try {
39 waitUntil(work);
40 } catch {
41 // Outside a request: the write finishes or not; nothing waits on it.
42 }
43}
44
Agents as a team: lifecycle, merge queue, billing and a new shell45/**
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate46 * About 8 MB of highlighted lines per isolate (two bytes a character); one
47 * file up to a quarter of that, which a 1,800-line file fits. A pull
48 * request's first screens are at most 40,000 characters of text, about
49 * ten times that highlighted.
50 */
51const linesCache = contentCache<string[]>({
52 name: "highlight-lines",
53 version: HIGHLIGHT_VERSION,
54 maxWeight: 4_000_000,
55 weigh: weightOfLines,
56 shared: dataCentre,
57 defer,
58});
59
60const filesCache = contentCache<FileHtml>({
61 name: "highlight-diff",
62 version: HIGHLIGHT_VERSION,
63 maxWeight: 2_000_000,
64 weigh: (html) => html.reduce((sum, hunk) => sum + weightOfLines(hunk), 0),
65 shared: dataCentre,
66 defer,
67});
68
69/**
Agents as a team: lifecycle, merge queue, billing and a new shell70 * A file's lines as highlighted HTML, one string per line, or null when its
71 * language is unknown or it is too large.
72 */
73export async function highlightLines(path: string, text: string): Promise<string[] | null> {
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate74 const { languageOf } = await shiki();
Agents as a team: lifecycle, merge queue, billing and a new shell75 const lang = languageOf(path);
API and MCP server, Rust identity service, registration, site redesign76 if (!lang || text.length > MAX_HIGHLIGHT_CHARS) return null;
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate77 const code = text.replace(/\n$/, "");
78 return linesCache([lang, code], async () => {
79 const { getHighlighter, linesToHtml } = await shiki();
80 try {
81 return linesToHtml(await getHighlighter(), code, lang);
82 } catch {
83 return null;
84 }
85 });
API and MCP server, Rust identity service, registration, site redesign86}
Usage, Billing settings and prepaid AI credit; fixes from the UX audit87
88/**
89 * How much of a change is highlighted before the page is sent: its first
90 * screens. The rest is highlighted in the browser as it comes near
91 * (components/diff-view.tsx), so a large change never holds the page up.
92 */
93const FIRST_SCREENS_CHARS = 40_000;
94
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate95/** A file's diff highlighted, from the cache when the same lines were highlighted before. */
96async function highlightFileCached(file: Comparison["files"][number]): Promise<HighlightedFile | null> {
97 const { highlightFile, languageOf } = await shiki();
98 const lang = languageOf(file.path);
99 // Nothing to highlight: highlightFile says so without any work.
100 if (!lang || file.binary) return null;
101 const html = await filesCache([lang, diffContent(file)], async () => {
102 const highlighted = await highlightFile(file).catch(() => null);
103 return highlighted ? htmlOfFile(highlighted) : null;
104 });
105 return html ? withHtml(file, html) : null;
106}
107
Usage, Billing settings and prepaid AI credit; fixes from the UX audit108/**
109 * A comparison with its first files' lines highlighted, in order, until
110 * the budget runs out, so what is on screen when the page arrives already
111 * has its colours.
112 */
113export async function highlightFirstFiles(comparison: Comparison): Promise<HighlightedComparison> {
114 let budget = FIRST_SCREENS_CHARS;
115 const files: HighlightedFile[] = [];
116 for (const file of comparison.files) {
117 const size = file.hunks.reduce((sum, hunk) => sum + hunk.lines.reduce((n, line) => n + line.text.length + 1, 0), 0);
118 if (budget <= 0 || size > budget || file.binary) {
119 // Past the first screens: everything after it waits for the browser.
120 budget = 0;
121 files.push(file);
122 continue;
123 }
124 budget -= size;
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate125 files.push((await highlightFileCached(file).catch(() => null)) ?? file);
Usage, Billing settings and prepaid AI credit; fixes from the UX audit126 }
127 return { ...comparison, files };
128}

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