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@@ -19,7 +19,7 @@
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*/
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import { createHighlighterCoreSync, createCssVariablesTheme } from 'shiki/core'
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-import { createJavaScriptRegexEngine } from 'shiki/engine/javascript'
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+import { createJavaScriptRegexEngine, defaultJavaScriptRegexConstructor } from 'shiki/engine/javascript'
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import langTs from '@shikijs/langs/typescript'
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import langBash from '@shikijs/langs/shellscript'
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import langJson from '@shikijs/langs/json'
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@@ -140,6 +140,20 @@ const cssVariablesTheme = createCssVariablesTheme({
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fontStyle: true,
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})
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+/**
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+ * The client regex engine compiles each TextMate pattern when its scanner is
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+ * created. Shiki otherwise defers patterns longer than 3,000 characters until
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+ * their first match; that compilation counts against Shiki's 500 ms per-line
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+ * budget and can return a partial token stream under host contention. Eager
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+ * compilation leaves the same budget in place for scanning user content.
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+ */
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+const regexEngine = createJavaScriptRegexEngine({
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+ forgiving: true,
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+ regexConstructor: pattern => defaultJavaScriptRegexConstructor(pattern, {
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+ lazyCompileLength: Number.POSITIVE_INFINITY,
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+ }),
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+})
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+
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let singleton: HighlighterCore | undefined
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/** The synchronous highlighter (one instance per document); pre-warmed below, lazy as the fallback. */
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@@ -147,7 +161,7 @@ function highlighter(): HighlighterCore {
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singleton ??= createHighlighterCoreSync({
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themes: [cssVariablesTheme],
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langs: LANGS,
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- engine: createJavaScriptRegexEngine({ forgiving: true }),
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+ engine: regexEngine,
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})
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return singleton
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}
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Tianyi Cui