ui: reduce per-token render cost when streaming (#26053)
* performance harness - the empirical root Assisted-by: Claude Opus 4.8 * 210.36ms -> 2.67ms per streamed token Assisted-by: Claude Opus 4.8 * 11.58ms -> 0.62ms per streamed token Assisted-by: Claude Opus 4.8 * 22.02ms -> 3.33ms per streamed token Assisted-by: Claude Opus 4.8 * 3.07ms -> 1.36ms per streamed token at 40 messages Assisted-by: Claude Opus 4.8 --------- Co-authored-by: Zach Winter <dmtommy@icloud.com>
This commit is contained in:
Zach Winter
co-authored by
Zach Winter
Zach Winter
parent
96013c5112
commit
555881ebc8
@@ -89,10 +89,15 @@
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</Collapsible.Trigger>
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<Collapsible.Content>
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<div class="pl-1.5 grid min-w-0" style="min-height: var(--min-message-height);">
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<div class="min-w-0 border-l border-muted-foreground/20 pl-4 pb-2 my-2">
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{@render children()}
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<!-- Collapsible.Content renders its children unconditionally and only sets
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`hidden`, so a closed block would keep re-rendering its whole body on
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every streamed token. Gate on `open` so collapsed content costs nothing. -->
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{#if open}
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<div class="pl-1.5 grid min-w-0" style="min-height: var(--min-message-height);">
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<div class="min-w-0 border-l border-muted-foreground/20 pl-4 pb-2 my-2">
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{@render children()}
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</div>
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</div>
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</div>
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{/if}
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</Collapsible.Content>
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</Collapsible.Root>
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@@ -90,8 +90,12 @@
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</Collapsible.Trigger>
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<Collapsible.Content>
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<div class="p-3 pt-1">
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{@render children()}
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</div>
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<!-- See CollapsibleContentBlock: bits-ui keeps closed content mounted, which
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makes a collapsed tool result re-render on every streamed token. -->
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{#if open}
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<div class="p-3 pt-1">
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{@render children()}
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</div>
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{/if}
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</Collapsible.Content>
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</Collapsible.Root>
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@@ -107,6 +107,15 @@
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return null;
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});
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const liveSvgHtml = $derived(streamingSvgCode !== null ? sanitizeSvg(streamingSvgCode) : '');
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// Derived rather than called inline in the template so it only recomputes when
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// the block actually changes. Auto-detection is disabled while streaming: it
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// costs ~38ms a call and re-guesses the language on every chunk.
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const streamingCodeHtml = $derived(
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incompleteCodeBlock
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? highlightCode(incompleteCodeBlock.code, incompleteCodeBlock.language || 'text', false)
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: ''
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);
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let previewDialogOpen = $state(false);
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let previewCode = $state('');
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let previewLanguage = $state('text');
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@@ -903,10 +912,7 @@
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>
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<pre class="streaming-code-pre"><code
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class="hljs language-{incompleteCodeBlock.language || 'text'}"
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>{@html highlightCode(
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incompleteCodeBlock.code,
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incompleteCodeBlock.language || 'text'
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)}</code
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>{@html streamingCodeHtml}</code
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></pre>
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</div>
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</div>
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@@ -28,6 +28,14 @@ export const LATEX_MATH_AND_CODE_PATTERN =
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/** Regex to capture the content of a $$...\\\\...$$ block (display-formula with line-break) */
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export const LATEX_LINEBREAK_REGEXP = /\$\$([\s\S]*?\\\\[\s\S]*?)\$\$/;
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/**
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* Cheap gate for `preprocessLaTeX`. Every transformation it performs is triggered
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* by a `$` (inline/display math, currency escaping) or a backslash escape
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* (`\(`, `\[`, `\ce{`, `\pu{`). Text containing neither is returned untouched, so
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* this lets the caller skip the whole protect/restore pipeline.
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*/
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export const LATEX_TRIGGER_REGEXP = /[$\\]/;
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/** map from mchem-regexp to replacement */
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export const MHCHEM_PATTERN_MAP: readonly [RegExp, string][] = [
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[/(\s)\$\\ce{/g, '$1$\\\\ce{'],
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@@ -169,8 +169,21 @@ class ConversationsStore {
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* Updates a message at a specific index in active messages
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*/
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updateMessageAtIndex(index: number, updates: Partial<DatabaseMessage>): void {
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if (index !== -1 && this.activeMessages[index]) {
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this.activeMessages[index] = { ...this.activeMessages[index], ...updates };
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const message = index === -1 ? undefined : this.activeMessages[index];
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if (!message) return;
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// Assign field by field rather than replacing the object. Replacing it
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// changes the array slot, which invalidates every consumer that merely
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// walks the list - notably ChatMessages.displayMessages, which rebuilds
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// entries for every message in the conversation. Deep $state proxies make
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// per-field writes fine-grained, so only readers of the changed field wake.
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const target = message as unknown as Record<string, unknown>;
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for (const [key, value] of Object.entries(updates)) {
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if (target[key] !== value) {
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target[key] = value;
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}
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}
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}
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@@ -30,13 +30,21 @@ function trimCodePadding(code: string): string {
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return code.replace(TRIM_LEADING_PADDING_REGEX, '').replace(TRIM_TRAILING_PADDING_REGEX, '');
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}
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function escapeCode(code: string): string {
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return code.replace(AMPERSAND_REGEX, '&').replace(LT_REGEX, '<').replace(GT_REGEX, '>');
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}
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/**
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* Highlights code using highlight.js
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* @param code - The code to highlight
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* @param language - The programming language
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* @param autoDetect - Fall back to `highlightAuto` when `language` is unknown.
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* Callers rendering a still-streaming block should pass false: auto-detection
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* costs ~38ms per call and re-guesses on every chunk, so the language (and
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* therefore the whole highlight) flickers as the block grows.
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* @returns HTML string with syntax highlighting
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*/
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export function highlightCode(code: string, language: string): string {
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export function highlightCode(code: string, language: string, autoDetect = true): string {
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if (!code) return '';
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const trimmed = trimCodePadding(code);
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@@ -47,15 +55,14 @@ export function highlightCode(code: string, language: string): string {
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if (isSupported) {
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return hljs.highlight(trimmed, { language: lang }).value;
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} else {
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} else if (autoDetect) {
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return hljs.highlightAuto(trimmed).value;
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} else {
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return escapeCode(trimmed);
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}
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} catch {
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// Fallback to escaped plain text
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return trimmed
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.replace(AMPERSAND_REGEX, '&')
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.replace(LT_REGEX, '<')
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.replace(GT_REGEX, '>');
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return escapeCode(trimmed);
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}
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}
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@@ -2,6 +2,7 @@ import {
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CODE_BLOCK_REGEXP,
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LATEX_MATH_AND_CODE_PATTERN,
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LATEX_LINEBREAK_REGEXP,
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LATEX_TRIGGER_REGEXP,
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MHCHEM_PATTERN_MAP
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} from '$lib/constants';
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@@ -148,6 +149,15 @@ export function preprocessLaTeX(content: string): string {
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// See also:
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// https://github.com/danny-avila/LibreChat/blob/main/client/src/utils/latex.ts
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// Every step below keys off a `$` or a backslash escape (\[ \] \( \) \ce{ \pu{).
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// With neither present the protect/restore passes round-trip the input
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// unchanged, so skip them: the step 2 scan is O(n^2) in line length and costs
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// ~90ms on a 26KB single-line message that contains no math at all. This
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// matters during streaming, where the whole message is reprocessed per frame.
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if (!LATEX_TRIGGER_REGEXP.test(content)) {
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return content;
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}
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// Step 0: Temporarily remove blockquote markers (>) to process LaTeX correctly
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// Store the structure so we can restore it later
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const blockquoteMarkers: Map<number, string> = new Map();
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@@ -175,24 +185,31 @@ export function preprocessLaTeX(content: string): string {
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const latexExpressions: string[] = [];
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// Match \S...\[...\] and protect them and insert a line-break.
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content = content.replace(/([\S].*?)\\\[([\s\S]*?)\\\](.*)/g, (match, group1, group2, group3) => {
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// Check if there are characters following the formula (display-formula in a table-cell?)
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if (group1.endsWith('\\')) {
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return match; // Backslash before \[, do nothing.
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}
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const hasSuffix = /\S/.test(group3);
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let optBreak;
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// Guarded: with no `\[` present this pattern still probes every start offset,
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// expanding `.*?` to the end of each line before failing - O(n^2) for nothing.
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if (content.includes('\\[')) {
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content = content.replace(
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/([\S].*?)\\\[([\s\S]*?)\\\](.*)/g,
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(match, group1, group2, group3) => {
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// Check if there are characters following the formula (display-formula in a table-cell?)
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if (group1.endsWith('\\')) {
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return match; // Backslash before \[, do nothing.
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}
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const hasSuffix = /\S/.test(group3);
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let optBreak;
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if (hasSuffix) {
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latexExpressions.push(`\\(${group2.trim()}\\)`); // Convert into inline.
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optBreak = '';
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} else {
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latexExpressions.push(`\\[${group2}\\]`);
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optBreak = '\n';
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}
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if (hasSuffix) {
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latexExpressions.push(`\\(${group2.trim()}\\)`); // Convert into inline.
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optBreak = '';
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} else {
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latexExpressions.push(`\\[${group2}\\]`);
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optBreak = '\n';
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}
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return `${group1}${optBreak}<<LATEX_${latexExpressions.length - 1}>>${optBreak}${group3}`;
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});
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return `${group1}${optBreak}<<LATEX_${latexExpressions.length - 1}>>${optBreak}${group3}`;
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}
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);
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}
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// Match \(...\), \[...\], $$...$$ and protect them
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content = content.replace(
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@@ -0,0 +1,58 @@
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# Agentic thread perf harness
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Two tiers, both reusing the existing vitest projects (see `vite.config.ts`).
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## Tier 1 - `agentic-stream.perf.svelte.test.ts` (project: `client`, real Chromium)
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Mounts `ChatMessageAgenticContent` and replays a stream, replacing the message
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object on each chunk exactly as the real pipeline does:
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- `chat.svelte.ts` `updateStreamingUI()` runs per SSE chunk
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- `conversations.svelte.ts` `updateMessageAtIndex` does `{ ...old, ...updates }`
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That new object identity is the thing under test: it cascades through
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`deriveAgenticSections` (which returns fresh `AgenticSection` objects) into every
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tool-call block in the message, including completed ones.
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```
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npx vitest --project=client --run tests/client/agentic-stream.perf.svelte.test.ts
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```
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### Reading the output
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- `mean` / `p95` / `max` - the synchronous window per token: prop write,
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`await tick()`, then a forced `offsetHeight` read so style and layout are
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included rather than deferred.
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- `sync` - sum of those windows. This is the number to optimize.
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- `wall` - the whole run including work `MarkdownContent` defers into its own
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`requestAnimationFrame`. It carries a ~16.7ms/token idle floor because the
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harness yields a frame each iteration, so compare `wall` **across fixtures**,
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never against `sync`.
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### The knobs, and what each one discriminates
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The point of the harness is the _scaling curve_, not any single number.
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| Knob | Reads on |
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| --------------------------- | ---------------------------------------------------------------------------------------------------- |
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| `priorToolCalls` (0/1/5/20) | the reactive fan-out. Flat => no fan-out. Linear => confirmed. |
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| `toolResultBytes` | whole-blob string scans (`extractSearchResults`, `parseToolResultWithImages`, `classifyToolResult`). |
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| `editFileEdits` | `computeLineDiff`, the O(m\*n) LCS. |
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| `openCodeFence` | `hljs.highlightAuto` on partial code. |
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Deliberately no hard assertions: CI timing is noisy and the value here is the
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before/after delta, not a gate.
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### Caveat
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This measures one message's subtree. In the real app `ChatMessages.svelte`
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rebuilds its whole `displayMessages` list per token, so multiply by the number
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of rendered messages to get the conversation-level cost.
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## Tier 2 - `../unit/agentic-hotpath.bench.ts` (project: `unit`, node)
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Per-call costs for the pure functions the curve implicates.
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```
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npx vitest bench --project=unit --run tests/unit/agentic-hotpath.bench.ts
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```
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@@ -0,0 +1,410 @@
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// Tier 1 perf harness for the agentic thread.
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//
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// Drives ChatMessageAgenticContent the way the real streaming pipeline does:
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// chat.svelte.ts -> conversations.svelte.ts:184 replaces the message object per
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// SSE chunk (`{ ...old, ...updates }`), which changes prop identity and cascades
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// through deriveAgenticSections into every tool-call block in the message.
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//
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// The fixture is parameterized so the *scaling curve* identifies the culprit -
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// a single number would not. See tests/client/README-perf.md.
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//
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// Run: npx vitest --project=client --run tests/client/agentic-stream.perf.svelte.test.ts
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import { describe, it } from 'vitest';
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import { render } from 'vitest-browser-svelte';
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import { tick } from 'svelte';
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import AgenticPerfWrapper from './components/AgenticPerfWrapper.svelte';
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import ChatMessagesPerfWrapper from './components/ChatMessagesPerfWrapper.svelte';
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import { perfState } from './components/agentic-perf-state.svelte';
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import { conversationsStore } from '$lib/stores/conversations.svelte';
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import type { DatabaseMessage } from '$lib/types';
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import { MessageRole } from '$lib/enums';
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// --- fixture construction -------------------------------------------------
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interface FixtureOpts {
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/** Completed tool-call sections preceding the streaming text. */
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priorToolCalls: number;
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/** Size of each tool result blob. */
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toolResultBytes: number;
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/** Number of edit_file calls (each a 400x400-line diff). */
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editFileEdits: number;
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/** Leave an unclosed ``` fence at the end of the streamed content. */
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openCodeFence: boolean;
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/**
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* Emit a blank line every N chunks so the content forms real markdown
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* blocks. 0 = one unbroken paragraph, which defeats MarkdownContent's
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* stable-block cache entirely (worst case). Typical prose has breaks.
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*/
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paragraphEvery: number;
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}
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const DEFAULTS: FixtureOpts = {
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priorToolCalls: 0,
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toolResultBytes: 1024,
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editFileEdits: 0,
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openCodeFence: false,
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paragraphEvery: 0
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};
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function blob(bytes: number, seed: string): string {
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const line = `${seed} output line with some representative width to it`;
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const n = Math.max(1, Math.ceil(bytes / (line.length + 1)));
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const out: string[] = [];
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for (let i = 0; i < n; i++) out.push(`${line} ${i}`);
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return out.join('\n');
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}
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function diffLines(n: number, seed: string): string {
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const out: string[] = [];
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for (let i = 0; i < n; i++) out.push(`${seed} line ${i} const value_${i} = compute(${i});`);
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return out.join('\n');
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}
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let msgSeq = 0;
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function baseMessage(overrides: Partial<DatabaseMessage>): DatabaseMessage {
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return {
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id: `m${msgSeq++}`,
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convId: 'perf-conv',
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type: 'text',
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timestamp: 0,
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role: MessageRole.ASSISTANT,
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content: '',
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parent: null,
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children: [],
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...overrides
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} as DatabaseMessage;
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}
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function buildFixture(opts: FixtureOpts): {
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message: DatabaseMessage;
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toolMessages: DatabaseMessage[];
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} {
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const toolCalls: unknown[] = [];
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const toolMessages: DatabaseMessage[] = [];
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for (let i = 0; i < opts.priorToolCalls; i++) {
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const id = `call_${i}`;
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toolCalls.push({
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id,
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type: 'function',
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function: {
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name: 'exec_shell_command',
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arguments: JSON.stringify({ command: `grep -rn "thing_${i}" src/` })
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}
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});
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toolMessages.push(
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baseMessage({
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role: MessageRole.TOOL,
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toolCallId: id,
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content: `${blob(opts.toolResultBytes, `t${i}`)}\n[exit code: 0]`
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})
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);
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}
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for (let i = 0; i < opts.editFileEdits; i++) {
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const id = `edit_${i}`;
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toolCalls.push({
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id,
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type: 'function',
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function: {
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name: 'edit_file',
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arguments: JSON.stringify({
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path: `/src/file_${i}.ts`,
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edits: [{ old_text: diffLines(400, 'old'), new_text: diffLines(400, 'new') }]
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})
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}
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});
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toolMessages.push(
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baseMessage({
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role: MessageRole.TOOL,
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toolCallId: id,
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content: JSON.stringify({ result: 'ok', edits_applied: 1 })
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})
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);
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}
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const message = baseMessage({
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toolCalls: toolCalls.length > 0 ? JSON.stringify(toolCalls) : undefined,
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content: ''
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});
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return { message, toolMessages };
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}
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// --- the driver -----------------------------------------------------------
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interface Sample {
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label: string;
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tokens: number;
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mean: number;
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p95: number;
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max: number;
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/** Sum of the synchronous per-token windows. */
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total: number;
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/** Wall-clock for the whole run incl. deferred rAF work, then settle. */
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wall: number;
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}
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function nextFrame(): Promise<void> {
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return new Promise((resolve) => requestAnimationFrame(() => resolve()));
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}
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const results: Sample[] = [];
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|
||||
/**
|
||||
* Replays `tokens` streamed chunks, replacing the message object each time
|
||||
* exactly as conversations.svelte.ts:184 does, flushing Svelte and forcing
|
||||
* layout so the measurement includes render + style/layout, not just script.
|
||||
*/
|
||||
async function measure(label: string, partial: Partial<FixtureOpts>, tokens = 60) {
|
||||
const opts = { ...DEFAULTS, ...partial };
|
||||
const { message, toolMessages } = buildFixture(opts);
|
||||
|
||||
perfState.message = message;
|
||||
perfState.toolMessages = toolMessages;
|
||||
perfState.isStreaming = true;
|
||||
|
||||
// Every wrapper reads the same module state, so a leftover mount from a
|
||||
// previous fixture would re-render on each mutation and fold its cost into
|
||||
// this measurement. Tear down explicitly between fixtures.
|
||||
const { unmount } = render(AgenticPerfWrapper);
|
||||
|
||||
await tick();
|
||||
|
||||
const CHUNK = 'The quick brown fox jumps over the lazy dog. ';
|
||||
let accumulated = opts.openCodeFence ? '```notalanguage\n' : '';
|
||||
const durations: number[] = [];
|
||||
|
||||
const wallStart = performance.now();
|
||||
|
||||
for (let i = 0; i < tokens; i++) {
|
||||
accumulated += CHUNK;
|
||||
if (opts.paragraphEvery > 0 && (i + 1) % opts.paragraphEvery === 0) {
|
||||
accumulated += '\n\n';
|
||||
}
|
||||
|
||||
const t0 = performance.now();
|
||||
// Mirrors updateMessageAtIndex: a brand-new object identity per chunk.
|
||||
perfState.message = { ...perfState.message!, content: accumulated };
|
||||
await tick();
|
||||
void document.body.offsetHeight; // force style + layout
|
||||
durations.push(performance.now() - t0);
|
||||
|
||||
// MarkdownContent coalesces its parse into a rAF, so that work lands
|
||||
// outside the window above. Yield a frame each iteration so it is
|
||||
// captured in `wall` - the gap between `wall` and `total` is the
|
||||
// deferred cost.
|
||||
await nextFrame();
|
||||
}
|
||||
|
||||
// Let any trailing coalesced work drain before stopping the clock.
|
||||
await nextFrame();
|
||||
await nextFrame();
|
||||
const wall = performance.now() - wallStart;
|
||||
|
||||
await unmount();
|
||||
|
||||
durations.sort((a, b) => a - b);
|
||||
const total = durations.reduce((a, b) => a + b, 0);
|
||||
|
||||
results.push({
|
||||
label,
|
||||
tokens,
|
||||
mean: total / durations.length,
|
||||
p95: durations[Math.floor(durations.length * 0.95)],
|
||||
max: durations[durations.length - 1],
|
||||
total,
|
||||
wall
|
||||
});
|
||||
}
|
||||
|
||||
function report() {
|
||||
const pad = (s: string, n: number) => s.padEnd(n);
|
||||
const num = (n: number) => n.toFixed(2).padStart(8);
|
||||
|
||||
const header = `${pad('fixture', 40)}${pad('tok', 5)}${'mean'.padStart(8)}${'p95'.padStart(8)}${'max'.padStart(8)}${'sync'.padStart(9)}${'wall'.padStart(9)}`;
|
||||
const lines = [
|
||||
'',
|
||||
'=== Tier 1: ms per streamed token (agentic content subtree) ===',
|
||||
'mean/p95/max = synchronous window per token (script + style + layout).',
|
||||
'sync = sum of those windows.',
|
||||
'wall = whole run, incl. work MarkdownContent defers into its own rAF.',
|
||||
' NOTE: wall carries a ~16.7ms/token idle floor from the harness',
|
||||
' yielding a frame each iteration (60 tokens => ~1000ms floor).',
|
||||
' Compare wall ACROSS fixtures / against the baseline row,',
|
||||
' never against sync.',
|
||||
'',
|
||||
header,
|
||||
'-'.repeat(header.length)
|
||||
];
|
||||
|
||||
for (const r of results) {
|
||||
lines.push(
|
||||
`${pad(r.label, 40)}${pad(String(r.tokens), 5)}${num(r.mean)}${num(r.p95)}${num(r.max)}${num(r.total)}${num(r.wall)}`
|
||||
);
|
||||
}
|
||||
|
||||
lines.push('');
|
||||
console.log(lines.join('\n'));
|
||||
}
|
||||
|
||||
// --- conversation-level driver --------------------------------------------
|
||||
// The per-message driver above cannot see the fan-out in ChatMessages: a single
|
||||
// token mutation invalidates `displayMessages`, which rebuilds a fresh
|
||||
// toolMessages array for EVERY message in the conversation. Drive the real
|
||||
// store through the real list component to measure that.
|
||||
|
||||
async function measureConversation(
|
||||
label: string,
|
||||
priorMessages: number,
|
||||
tokens = 60,
|
||||
/**
|
||||
* Give each prior assistant turn a resolved tool call, so the fixture pays
|
||||
* `hasAgenticContent`'s JSON.parse and the tool-message grouping walk that a
|
||||
* real agent thread would - plain prose messages skip both.
|
||||
*/
|
||||
agentic = false
|
||||
) {
|
||||
const history: DatabaseMessage[] = [];
|
||||
for (let i = 0; i < priorMessages; i++) {
|
||||
const isAssistant = i % 2 !== 0;
|
||||
|
||||
if (isAssistant && agentic) {
|
||||
const id = `prior_call_${i}`;
|
||||
history.push(
|
||||
baseMessage({
|
||||
role: MessageRole.ASSISTANT,
|
||||
content: `Message ${i}`,
|
||||
toolCalls: JSON.stringify([
|
||||
{
|
||||
id,
|
||||
type: 'function',
|
||||
function: {
|
||||
name: 'exec_shell_command',
|
||||
arguments: JSON.stringify({ command: `grep -rn "thing_${i}" src/` })
|
||||
}
|
||||
}
|
||||
])
|
||||
})
|
||||
);
|
||||
history.push(
|
||||
baseMessage({
|
||||
role: MessageRole.TOOL,
|
||||
toolCallId: id,
|
||||
content: `${blob(1024, `r${i}`)}\n[exit code: 0]`
|
||||
})
|
||||
);
|
||||
continue;
|
||||
}
|
||||
|
||||
history.push(
|
||||
baseMessage({
|
||||
role: isAssistant ? MessageRole.ASSISTANT : MessageRole.USER,
|
||||
content: `Message ${i}: ${blob(512, `m${i}`)}`
|
||||
})
|
||||
);
|
||||
}
|
||||
|
||||
const streaming = baseMessage({ role: MessageRole.ASSISTANT, content: '' });
|
||||
history.push(streaming);
|
||||
|
||||
conversationsStore.activeMessages = history;
|
||||
|
||||
const { unmount } = render(ChatMessagesPerfWrapper);
|
||||
await tick();
|
||||
|
||||
const idx = conversationsStore.findMessageIndex(streaming.id);
|
||||
const CHUNK = 'The quick brown fox jumps over the lazy dog. ';
|
||||
let accumulated = '';
|
||||
const durations: number[] = [];
|
||||
const wallStart = performance.now();
|
||||
|
||||
for (let i = 0; i < tokens; i++) {
|
||||
accumulated += CHUNK;
|
||||
|
||||
const t0 = performance.now();
|
||||
// The real path: chat.svelte.ts -> conversations.svelte.ts.
|
||||
conversationsStore.updateMessageAtIndex(idx, { content: accumulated });
|
||||
await tick();
|
||||
void document.body.offsetHeight;
|
||||
durations.push(performance.now() - t0);
|
||||
|
||||
await nextFrame();
|
||||
}
|
||||
|
||||
await nextFrame();
|
||||
await nextFrame();
|
||||
const wall = performance.now() - wallStart;
|
||||
|
||||
await unmount();
|
||||
conversationsStore.activeMessages = [];
|
||||
|
||||
durations.sort((a, b) => a - b);
|
||||
const total = durations.reduce((a, b) => a + b, 0);
|
||||
|
||||
results.push({
|
||||
label,
|
||||
tokens,
|
||||
mean: total / durations.length,
|
||||
p95: durations[Math.floor(durations.length * 0.95)],
|
||||
max: durations[durations.length - 1],
|
||||
total,
|
||||
wall
|
||||
});
|
||||
}
|
||||
|
||||
// --- the matrix -----------------------------------------------------------
|
||||
// Sequential, in one test, so the table prints together and the samples do not
|
||||
// interleave with other suites competing for the main thread.
|
||||
|
||||
describe('agentic streaming perf', () => {
|
||||
it('scales', { timeout: 600_000 }, async () => {
|
||||
// Baseline: plain text streaming, nothing agentic.
|
||||
await measure('baseline: no tool calls', {});
|
||||
|
||||
// Knob: priorToolCalls. Flat => no fan-out. Linear => fan-out confirmed.
|
||||
await measure('priorToolCalls=1 (1KB results)', { priorToolCalls: 1 });
|
||||
await measure('priorToolCalls=5 (1KB results)', { priorToolCalls: 5 });
|
||||
await measure('priorToolCalls=20 (1KB results)', { priorToolCalls: 20 });
|
||||
|
||||
// Knob: toolResultBytes, at fixed section count.
|
||||
await measure('5 calls x 200KB results', {
|
||||
priorToolCalls: 5,
|
||||
toolResultBytes: 200 * 1024
|
||||
});
|
||||
|
||||
// Knob: editFileEdits (computeLineDiff, 400x400 LCS).
|
||||
await measure('3 edit_file calls (400x400 diff)', { editFileEdits: 3 });
|
||||
|
||||
// Knob: openCodeFence (hljs highlightAuto on partial code).
|
||||
await measure('open code fence, unknown language', { openCodeFence: true });
|
||||
|
||||
// Conversation level: does streaming one message cost more as the
|
||||
// conversation grows? Flat => no fan-out. Linear => confirmed.
|
||||
await measureConversation('convo: 1 prior message', 1);
|
||||
await measureConversation('convo: 10 prior messages', 10);
|
||||
await measureConversation('convo: 40 prior messages', 40);
|
||||
|
||||
// Same, but each prior assistant turn carries a resolved tool call.
|
||||
await measureConversation('convo: 10 prior, agentic', 10, 60, true);
|
||||
await measureConversation('convo: 40 prior, agentic', 40, 60, true);
|
||||
|
||||
// Message length: MarkdownContent re-parses the whole accumulated string
|
||||
// each frame, so per-token cost should climb as the response grows.
|
||||
// A rising mean across these three rows means O(n^2) over the stream.
|
||||
// One unbroken paragraph: worst case, stable-block cache never applies.
|
||||
await measure('len 60tok 1-para (worst case)', {}, 60);
|
||||
await measure('len 250tok 1-para (worst case)', {}, 250);
|
||||
await measure('len 600tok 1-para (worst case)', {}, 600);
|
||||
|
||||
// Same lengths, broken into paragraphs every 8 chunks: the typical shape,
|
||||
// where only the trailing paragraph should be unstable.
|
||||
await measure('len 60tok paras (typical)', { paragraphEvery: 8 }, 60);
|
||||
await measure('len 250tok paras (typical)', { paragraphEvery: 8 }, 250);
|
||||
await measure('len 600tok paras (typical)', { paragraphEvery: 8 }, 600);
|
||||
|
||||
report();
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,37 @@
|
||||
// Guards the lazy-body behaviour of the shared collapsible wrappers.
|
||||
//
|
||||
// bits-ui's Collapsible.Content renders its children unconditionally and only
|
||||
// sets `hidden`, so before this was gated a collapsed tool result kept its whole
|
||||
// body in the DOM and re-rendered it on every streamed token (measured at
|
||||
// ~41ms/section/token for a 200KB result). These tests pin the fix: closed means
|
||||
// not rendered, and opening still mounts the body.
|
||||
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { render } from 'vitest-browser-svelte';
|
||||
import { tick } from 'svelte';
|
||||
import CollapsibleLazyBodyHarness from './components/CollapsibleLazyBodyHarness.svelte';
|
||||
|
||||
const MARKER = 'collapsible-body-marker';
|
||||
|
||||
describe('collapsible wrappers render their body lazily', () => {
|
||||
for (const variant of ['content', 'terminal'] as const) {
|
||||
it(`${variant}: body is absent while closed and present once open`, async () => {
|
||||
const screen = render(CollapsibleLazyBodyHarness, { variant, open: false });
|
||||
await tick();
|
||||
|
||||
expect(document.body.textContent).not.toContain(MARKER);
|
||||
|
||||
await screen.rerender({ variant, open: true });
|
||||
await tick();
|
||||
|
||||
expect(document.body.textContent).toContain(MARKER);
|
||||
|
||||
// And it unmounts again on close, so a collapsed block stops costing
|
||||
// anything during streaming.
|
||||
await screen.rerender({ variant, open: false });
|
||||
await tick();
|
||||
|
||||
expect(document.body.textContent).not.toContain(MARKER);
|
||||
});
|
||||
}
|
||||
});
|
||||
@@ -0,0 +1,16 @@
|
||||
<script lang="ts">
|
||||
import * as Tooltip from '$lib/components/ui/tooltip';
|
||||
import ChatMessageAgenticContent from '$lib/components/app/chat/ChatMessages/ChatMessageAgenticContent.svelte';
|
||||
import { perfState } from './agentic-perf-state.svelte';
|
||||
</script>
|
||||
|
||||
<Tooltip.Provider>
|
||||
{#if perfState.message}
|
||||
<ChatMessageAgenticContent
|
||||
message={perfState.message}
|
||||
toolMessages={perfState.toolMessages}
|
||||
isStreaming={perfState.isStreaming}
|
||||
isLastAssistantMessage
|
||||
/>
|
||||
{/if}
|
||||
</Tooltip.Provider>
|
||||
@@ -0,0 +1,12 @@
|
||||
<script lang="ts">
|
||||
// Mounts the real ChatMessages list against the real conversations store, so
|
||||
// the harness exercises `displayMessages` (which rebuilds every message's
|
||||
// toolMessages array) rather than a single message subtree.
|
||||
import * as Tooltip from '$lib/components/ui/tooltip';
|
||||
import ChatMessages from '$lib/components/app/chat/ChatMessages/ChatMessages.svelte';
|
||||
import { conversationsStore } from '$lib/stores/conversations.svelte';
|
||||
</script>
|
||||
|
||||
<Tooltip.Provider>
|
||||
<ChatMessages messages={conversationsStore.activeMessages} />
|
||||
</Tooltip.Provider>
|
||||
@@ -0,0 +1,21 @@
|
||||
<script lang="ts">
|
||||
import CollapsibleContentBlock from '$lib/components/app/content/CollapsibleContentBlock.svelte';
|
||||
import CollapsibleTerminalBlock from '$lib/components/app/content/CollapsibleTerminalBlock.svelte';
|
||||
|
||||
interface Props {
|
||||
variant: 'content' | 'terminal';
|
||||
open: boolean;
|
||||
}
|
||||
|
||||
let { variant, open }: Props = $props();
|
||||
</script>
|
||||
|
||||
{#if variant === 'content'}
|
||||
<CollapsibleContentBlock {open} title="Block">
|
||||
<span>collapsible-body-marker</span>
|
||||
</CollapsibleContentBlock>
|
||||
{:else}
|
||||
<CollapsibleTerminalBlock {open} title="Block">
|
||||
<span>collapsible-body-marker</span>
|
||||
</CollapsibleTerminalBlock>
|
||||
{/if}
|
||||
@@ -0,0 +1,17 @@
|
||||
// Shared reactive fixture state for the Tier 1 perf harness.
|
||||
//
|
||||
// The wrapper component reads this module directly rather than taking props,
|
||||
// so the driver can mutate it without depending on how the test renderer
|
||||
// forwards props.
|
||||
|
||||
import type { DatabaseMessage } from '$lib/types';
|
||||
|
||||
export const perfState = $state<{
|
||||
message: DatabaseMessage | null;
|
||||
toolMessages: DatabaseMessage[];
|
||||
isStreaming: boolean;
|
||||
}>({
|
||||
message: null,
|
||||
toolMessages: [],
|
||||
isStreaming: true
|
||||
});
|
||||
@@ -0,0 +1,64 @@
|
||||
// Pins the contract that makes streaming cheap: updateMessageAtIndex mutates the
|
||||
// existing message object instead of replacing it.
|
||||
//
|
||||
// Replacing it (`{ ...old, ...updates }`) changes the array slot, which
|
||||
// invalidates every consumer that merely walks the list - ChatMessages'
|
||||
// `displayMessages` rebuilds entries for EVERY message in the conversation. That
|
||||
// made per-token cost scale with conversation length (1.26ms at 1 prior message
|
||||
// -> 3.07ms at 40). Mutating in place keeps it flat.
|
||||
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { conversationsStore } from '$lib/stores/conversations.svelte';
|
||||
import type { DatabaseMessage } from '$lib/types';
|
||||
import { MessageRole } from '$lib/enums';
|
||||
|
||||
function makeMessage(id: string): DatabaseMessage {
|
||||
return {
|
||||
id,
|
||||
convId: 'c1',
|
||||
type: 'text',
|
||||
timestamp: 0,
|
||||
role: MessageRole.ASSISTANT,
|
||||
content: '',
|
||||
parent: null,
|
||||
children: []
|
||||
} as DatabaseMessage;
|
||||
}
|
||||
|
||||
describe('conversationsStore.updateMessageAtIndex', () => {
|
||||
it('mutates in place, preserving object identity', () => {
|
||||
conversationsStore.activeMessages = [makeMessage('a'), makeMessage('b')];
|
||||
const before = conversationsStore.activeMessages[1];
|
||||
|
||||
conversationsStore.updateMessageAtIndex(1, { content: 'hello' });
|
||||
|
||||
expect(conversationsStore.activeMessages[1].content).toBe('hello');
|
||||
expect(conversationsStore.activeMessages[1]).toBe(before);
|
||||
|
||||
conversationsStore.activeMessages = [];
|
||||
});
|
||||
|
||||
it('leaves other messages and unrelated fields untouched', () => {
|
||||
conversationsStore.activeMessages = [makeMessage('a'), makeMessage('b')];
|
||||
const untouched = conversationsStore.activeMessages[0];
|
||||
|
||||
conversationsStore.updateMessageAtIndex(1, { content: 'x', model: 'm1' });
|
||||
|
||||
expect(conversationsStore.activeMessages[0]).toBe(untouched);
|
||||
expect(conversationsStore.activeMessages[0].content).toBe('');
|
||||
expect(conversationsStore.activeMessages[1].model).toBe('m1');
|
||||
expect(conversationsStore.activeMessages[1].id).toBe('b');
|
||||
|
||||
conversationsStore.activeMessages = [];
|
||||
});
|
||||
|
||||
it('is a no-op for an index of -1 or out of range', () => {
|
||||
conversationsStore.activeMessages = [makeMessage('a')];
|
||||
|
||||
expect(() => conversationsStore.updateMessageAtIndex(-1, { content: 'x' })).not.toThrow();
|
||||
expect(() => conversationsStore.updateMessageAtIndex(9, { content: 'x' })).not.toThrow();
|
||||
expect(conversationsStore.activeMessages[0].content).toBe('');
|
||||
|
||||
conversationsStore.activeMessages = [];
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,248 @@
|
||||
// Microbenchmarks for the functions on the agentic-thread streaming hot path.
|
||||
//
|
||||
// Every function here is invoked from a `$derived` that is invalidated on each
|
||||
// streamed token, for every tool-call section in the message. These numbers give
|
||||
// the per-call cost; multiply by (tokens x sections) for the real damage.
|
||||
//
|
||||
// Run: npx vitest bench --project=unit tests/unit/agentic-hotpath.bench.ts
|
||||
|
||||
import { bench, describe } from 'vitest';
|
||||
|
||||
import { remark } from 'remark';
|
||||
import remarkBreaks from 'remark-breaks';
|
||||
import remarkGfm from 'remark-gfm';
|
||||
import remarkMath from 'remark-math';
|
||||
import remarkRehype from 'remark-rehype';
|
||||
import rehypeKatex from 'rehype-katex';
|
||||
import rehypeHighlight from 'rehype-highlight';
|
||||
import rehypeStringify from 'rehype-stringify';
|
||||
import { all as lowlightAll } from 'lowlight';
|
||||
|
||||
import { computeLineDiff } from '$lib/utils/compute-line-diff';
|
||||
import { extractSearchResults, extractSearchQuery } from '$lib/utils/search-results';
|
||||
import { parsePartialJsonArgs } from '$lib/utils/parse-partial-json-args';
|
||||
import { highlightCode, detectIncompleteCodeBlock } from '$lib/utils/code';
|
||||
import { classifyToolResult, parseToolResultWithImages } from '$lib/utils/agentic';
|
||||
import { preprocessLaTeX } from '$lib/utils/latex-protection';
|
||||
|
||||
// --- fixtures -------------------------------------------------------------
|
||||
|
||||
function lines(n: number, seed: string): string {
|
||||
const out: string[] = [];
|
||||
for (let i = 0; i < n; i++) out.push(`${seed} line ${i} const value_${i} = compute(${i});`);
|
||||
return out.join('\n');
|
||||
}
|
||||
|
||||
const SHELL_OUTPUT_1KB = lines(12, 'out');
|
||||
const SHELL_OUTPUT_200KB = lines(2600, 'out');
|
||||
const SHELL_OUTPUT_2MB = lines(26000, 'out');
|
||||
|
||||
// Realistic exec_shell_command result: the exit-code marker is the final line,
|
||||
// which is what the un-anchored EXIT_CODE regex has to scan the whole blob for.
|
||||
const SHELL_2MB_WITH_EXIT = `${SHELL_OUTPUT_2MB}\n[exit code: 0]`;
|
||||
|
||||
const EDIT_OLD_400 = lines(400, 'old');
|
||||
const EDIT_NEW_400 = lines(400, 'new');
|
||||
const EDIT_OLD_50 = lines(50, 'old');
|
||||
const EDIT_NEW_50 = lines(50, 'new');
|
||||
|
||||
const WRITE_FILE_ARGS = JSON.stringify({
|
||||
path: '/src/lib/thing.ts',
|
||||
content: lines(1500, 'src')
|
||||
});
|
||||
|
||||
const MARKDOWN_50KB = Array.from(
|
||||
{ length: 400 },
|
||||
(_, i) =>
|
||||
`## Section ${i}\n\nSome **bold** prose with a [link](https://example.com) and \`inline\` code.\n\n- bullet one\n- bullet two\n\n\`\`\`ts\nconst x${i} = ${i};\n\`\`\`\n`
|
||||
).join('\n');
|
||||
|
||||
const CODE_BLOCK_5KB = lines(60, 'code');
|
||||
|
||||
// --- A: computeLineDiff (O(m*n) LCS, allocates a full matrix) --------------
|
||||
|
||||
describe('computeLineDiff', () => {
|
||||
bench('50 x 50 lines', () => {
|
||||
computeLineDiff(EDIT_OLD_50, EDIT_NEW_50);
|
||||
});
|
||||
|
||||
bench('400 x 400 lines', () => {
|
||||
computeLineDiff(EDIT_OLD_400, EDIT_NEW_400);
|
||||
});
|
||||
});
|
||||
|
||||
// --- B: the unified processor, rebuilt per call ---------------------------
|
||||
// Mirrors MarkdownContent.svelte:144-176. The local rehype/remark plugins are
|
||||
// omitted (they pull in browser-only modules); rehypeHighlight + lowlightAll is
|
||||
// the dominant term, so this is a lower bound on the real cost.
|
||||
|
||||
function buildProcessor() {
|
||||
// eslint-disable-next-line @typescript-eslint/no-explicit-any
|
||||
let proc: any = remark().use(remarkGfm);
|
||||
proc = proc.use(remarkMath).use(remarkBreaks).use(remarkRehype).use(rehypeKatex);
|
||||
return proc.use(rehypeHighlight, { languages: lowlightAll }).use(rehypeStringify, {
|
||||
allowDangerousHtml: true
|
||||
});
|
||||
}
|
||||
|
||||
describe('markdown processor', () => {
|
||||
bench('build processor (per processMarkdown call, x2)', () => {
|
||||
buildProcessor();
|
||||
});
|
||||
|
||||
const prebuilt = buildProcessor();
|
||||
|
||||
bench('parse 50KB markdown with a prebuilt processor', () => {
|
||||
prebuilt.parse(MARKDOWN_50KB);
|
||||
});
|
||||
});
|
||||
|
||||
// Isolates the O(n^2) term measured in Tier 1: processMarkdown re-parses the
|
||||
// WHOLE accumulated string every frame, while only the last block can have
|
||||
// changed. If parse() dominates at these sizes, incremental parsing (re-parsing
|
||||
// only the tail after the last stable block) is the fix; if not, the cost is
|
||||
// downstream in transform/stringify/DOM.
|
||||
describe('markdown parse scaling (whole-string reparse per frame)', () => {
|
||||
const proc = buildProcessor();
|
||||
const prose = (kb: number) =>
|
||||
Array.from(
|
||||
{ length: Math.ceil((kb * 1024) / 64) },
|
||||
(_, i) => `The quick brown fox jumps over the lazy dog. Sentence ${i}.`
|
||||
).join(' ');
|
||||
|
||||
const MD_3KB = prose(3);
|
||||
const MD_11KB = prose(11);
|
||||
const MD_26KB = prose(26);
|
||||
|
||||
bench('parse 3KB', () => {
|
||||
proc.parse(MD_3KB);
|
||||
});
|
||||
|
||||
bench('parse 11KB', () => {
|
||||
proc.parse(MD_11KB);
|
||||
});
|
||||
|
||||
bench('parse 26KB', () => {
|
||||
proc.parse(MD_26KB);
|
||||
});
|
||||
|
||||
bench('parse only a 200-char tail (proposed incremental)', () => {
|
||||
proc.parse(MD_26KB.slice(-200));
|
||||
});
|
||||
});
|
||||
|
||||
// processMarkdown runs these over the WHOLE accumulated string every frame too,
|
||||
// before parse() even starts. Measure them before assuming parse is the target.
|
||||
describe('other whole-string passes per frame', () => {
|
||||
const prose = (kb: number) =>
|
||||
Array.from(
|
||||
{ length: Math.ceil((kb * 1024) / 64) },
|
||||
(_, i) => `The quick brown fox jumps over the lazy dog. Sentence ${i}.`
|
||||
).join(' ');
|
||||
|
||||
const MD_3KB = prose(3);
|
||||
const MD_11KB = prose(11);
|
||||
const MD_26KB = prose(26);
|
||||
const MD_26KB_LATEX = `${MD_26KB} and some math $x^2 + y^2 = z^2$ inline.`;
|
||||
|
||||
bench('preprocessLaTeX 3KB (no latex present)', () => {
|
||||
preprocessLaTeX(MD_3KB);
|
||||
});
|
||||
|
||||
bench('preprocessLaTeX 11KB (no latex present)', () => {
|
||||
preprocessLaTeX(MD_11KB);
|
||||
});
|
||||
|
||||
bench('preprocessLaTeX 26KB (no latex present)', () => {
|
||||
preprocessLaTeX(MD_26KB);
|
||||
});
|
||||
|
||||
bench('preprocessLaTeX 26KB (latex present)', () => {
|
||||
preprocessLaTeX(MD_26KB_LATEX);
|
||||
});
|
||||
|
||||
bench('detectIncompleteCodeBlock 26KB', () => {
|
||||
detectIncompleteCodeBlock(MD_26KB);
|
||||
});
|
||||
});
|
||||
|
||||
// --- C: extractSearchResults, run for EVERY tool of every type ------------
|
||||
|
||||
describe('extractSearchResults (only .length > 0 is consumed)', () => {
|
||||
bench('1KB non-search tool result', () => {
|
||||
extractSearchResults(SHELL_OUTPUT_1KB);
|
||||
});
|
||||
|
||||
bench('200KB non-search tool result', () => {
|
||||
extractSearchResults(SHELL_OUTPUT_200KB);
|
||||
});
|
||||
|
||||
bench('2MB non-search tool result', () => {
|
||||
extractSearchResults(SHELL_OUTPUT_2MB);
|
||||
});
|
||||
});
|
||||
|
||||
describe('extractSearchQuery', () => {
|
||||
bench('write_file args (throws on the JSON.parse path)', () => {
|
||||
extractSearchQuery(WRITE_FILE_ARGS);
|
||||
});
|
||||
});
|
||||
|
||||
// --- E: the un-anchored exit-code regex -----------------------------------
|
||||
// Reproduced inline so the bench is independent of the current call site.
|
||||
|
||||
const EXIT_CODE_TAIL = /\[exit code: (-?\d+)\]\s*$/;
|
||||
|
||||
describe('exit-code regex', () => {
|
||||
bench('whole 2MB blob (current behaviour)', () => {
|
||||
SHELL_2MB_WITH_EXIT.match(EXIT_CODE_TAIL);
|
||||
});
|
||||
|
||||
bench('last 64 chars only (proposed)', () => {
|
||||
SHELL_2MB_WITH_EXIT.slice(-64).match(EXIT_CODE_TAIL);
|
||||
});
|
||||
});
|
||||
|
||||
// --- per-line result parsers ----------------------------------------------
|
||||
|
||||
describe('parseToolResultWithImages', () => {
|
||||
bench('1KB', () => {
|
||||
parseToolResultWithImages(SHELL_OUTPUT_1KB, []);
|
||||
});
|
||||
|
||||
bench('200KB', () => {
|
||||
parseToolResultWithImages(SHELL_OUTPUT_200KB, []);
|
||||
});
|
||||
|
||||
bench('2MB', () => {
|
||||
parseToolResultWithImages(SHELL_OUTPUT_2MB, []);
|
||||
});
|
||||
});
|
||||
|
||||
describe('classifyToolResult', () => {
|
||||
bench('200KB plain text (falls through to looksLikeMarkdown)', () => {
|
||||
classifyToolResult(SHELL_OUTPUT_200KB);
|
||||
});
|
||||
});
|
||||
|
||||
describe('parsePartialJsonArgs', () => {
|
||||
bench('write_file args, ~60KB (char-by-char scan)', () => {
|
||||
parsePartialJsonArgs(WRITE_FILE_ARGS);
|
||||
});
|
||||
});
|
||||
|
||||
// --- F / I: highlight.js ---------------------------------------------------
|
||||
|
||||
describe('highlightCode', () => {
|
||||
bench('short bash command (title row, per token)', () => {
|
||||
highlightCode('grep -rn "foo" src/ | head -50', 'bash');
|
||||
});
|
||||
|
||||
bench('5KB known language', () => {
|
||||
highlightCode(CODE_BLOCK_5KB, 'typescript');
|
||||
});
|
||||
|
||||
bench('5KB unknown language -> highlightAuto', () => {
|
||||
highlightCode(CODE_BLOCK_5KB, 'not-a-language');
|
||||
});
|
||||
});
|
||||
@@ -79,4 +79,25 @@ describe('highlightCode', () => {
|
||||
const framed = highlightCode('\nfunction foo() {}\n', 'javascript');
|
||||
expect(framed).toBe(trimmed);
|
||||
});
|
||||
|
||||
it('auto-detects an unknown language by default', () => {
|
||||
const html = highlightCode('const answer = 42;', 'not-a-language');
|
||||
expect(html).toContain('hljs-');
|
||||
});
|
||||
|
||||
it('escapes instead of auto-detecting when autoDetect is false', () => {
|
||||
const html = highlightCode('const answer = 42;', 'not-a-language', false);
|
||||
expect(html).not.toContain('hljs-');
|
||||
expect(html).toBe('const answer = 42;');
|
||||
});
|
||||
|
||||
it('still highlights a known language when autoDetect is false', () => {
|
||||
const html = highlightCode('const answer = 42;', 'javascript', false);
|
||||
expect(html).toContain('hljs-');
|
||||
});
|
||||
|
||||
it('escapes html metacharacters when falling back to plain text', () => {
|
||||
const html = highlightCode('<script>a && b</script>', 'not-a-language', false);
|
||||
expect(html).toBe('<script>a && b</script>');
|
||||
});
|
||||
});
|
||||
|
||||
@@ -374,3 +374,41 @@ $$\n\\pi_n(\\mathbb{S}^3) = \\begin{cases}
|
||||
expect(output).toBe('Regular text with $x^2$.\n\n> Quote with $y^2$.\n\nMore text with $z^2$.');
|
||||
});
|
||||
});
|
||||
|
||||
// The fast path skips the whole protect/restore pipeline when the content has
|
||||
// neither `$` nor a backslash. These pin the assumption it relies on: such
|
||||
// content is returned byte-for-byte unchanged, and anything carrying a trigger
|
||||
// character still goes through the full pipeline.
|
||||
describe('preprocessLaTeX fast path', () => {
|
||||
const untouched = [
|
||||
['plain prose', 'The quick brown fox jumps over the lazy dog.'],
|
||||
['headings and lists', '# Title\n\n- one\n- two\n\n## Sub\n\n1. first\n2. second'],
|
||||
['fenced code without escapes', '```ts\nconst x = 1;\n```'],
|
||||
['inline code and emphasis', 'Use `npm run build` with **bold** and _italic_.'],
|
||||
['blockquotes', '> quoted line\n> another line'],
|
||||
['tables', '| a | b |\n| --- | --- |\n| 1 | 2 |'],
|
||||
['brackets and parens without escapes', 'array[0] and call(arg) and [link](/url)'],
|
||||
['multi-paragraph prose', 'First para.\n\nSecond para.\n\nThird para.']
|
||||
];
|
||||
|
||||
for (const [label, input] of untouched) {
|
||||
test(`returns ${label} unchanged`, () => {
|
||||
expect(preprocessLaTeX(input)).toBe(input);
|
||||
});
|
||||
}
|
||||
|
||||
test('still processes content once a trigger character is present', () => {
|
||||
expect(preprocessLaTeX('inline \\(x^2\\) here')).toBe('inline $x^2$ here');
|
||||
expect(preprocessLaTeX('Price: $5')).toBe('Price: \\$5');
|
||||
});
|
||||
|
||||
test('fast path result matches the full pipeline for trigger-free content', () => {
|
||||
// Appending a trigger char forces the slow path; stripping it back off
|
||||
// must agree with what the fast path returned for the same prefix.
|
||||
const body = 'Plain paragraph with no math.\n\nAnother paragraph here.';
|
||||
const viaFastPath = preprocessLaTeX(body);
|
||||
const viaFullPipeline = preprocessLaTeX(`${body}\n\n\\(z\\)`);
|
||||
|
||||
expect(viaFullPipeline.startsWith(viaFastPath)).toBe(true);
|
||||
});
|
||||
});
|
||||
|
||||
Reference in New Issue
Block a user