55 lines
2.1 KiB
TypeScript
55 lines
2.1 KiB
TypeScript
// highlight.js's type defs carry `/// <reference lib="dom" />`. SSETransport,
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// mcp/client, ssh, dumpPrompts use DOM types (TextDecodeOptions, RequestInfo)
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// that only typecheck because this file's `typeof import('highlight.js')` pulls
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// lib.dom in. tsconfig has lib: ["ESNext"] only — fixing the actual DOM-type
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// deps is a separate sweep; this ref preserves the status quo.
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/// <reference lib="dom" />
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import { extname } from 'path'
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export type CliHighlight = {
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highlight: typeof import('cli-highlight').highlight
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supportsLanguage: typeof import('cli-highlight').supportsLanguage
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}
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// One promise shared by Fallback.tsx, markdown.ts, events.ts, getLanguageName.
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// The highlight.js import piggybacks: cli-highlight has already pulled it into
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// the module cache, so the second import() is a cache hit — no extra bytes
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// faulted in.
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let cliHighlightPromise: Promise<CliHighlight | null> | undefined
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let loadedGetLanguage: typeof import('highlight.js').getLanguage | undefined
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async function loadCliHighlight(): Promise<CliHighlight | null> {
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try {
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const cliHighlight = await import('cli-highlight')
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// cache hit — cli-highlight already loaded highlight.js
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const highlightJs = await import('highlight.js')
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loadedGetLanguage = highlightJs.getLanguage
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return {
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highlight: cliHighlight.highlight,
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supportsLanguage: cliHighlight.supportsLanguage,
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}
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} catch {
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return null
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}
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}
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export function getCliHighlightPromise(): Promise<CliHighlight | null> {
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cliHighlightPromise ??= loadCliHighlight()
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return cliHighlightPromise
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}
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/**
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* eg. "foo/bar.ts" → "TypeScript". Awaits the shared cli-highlight load,
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* then reads highlight.js's language registry. All callers are telemetry
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* (OTel counter attributes, permission-dialog unary events) — none block
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* on this, they fire-and-forget or the consumer already handles Promise<string>.
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*/
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export async function getLanguageName(file_path: string): Promise<string> {
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await getCliHighlightPromise()
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const ext = extname(file_path).slice(1)
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if (!ext) return 'unknown'
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return loadedGetLanguage?.(ext)?.name ?? 'unknown'
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}
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