fix(trajectory): bound work during long streams
This commit is contained in:
_Kerman
@@ -0,0 +1,235 @@
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// Synthetic long-chat history for browser behavior contracts. The fixture is
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// generated through Session so pagination exercises the same event shapes as
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// persisted conversations, while unique markers identify semantic rows
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// without depending on CSS-module names or virtualizer DOM positions.
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import {
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CallId,
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createAssistantMessage,
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createToolResultMessage,
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createUserMessage,
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} from '@deepseek-ai/dsh-llm'
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import {
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SESSION_FORMAT_VERSION,
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Session,
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SessionId,
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} from '@deepseek-ai/dsh-session'
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// Carries the session/title event declaration into this fixture builder.
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import type {} from '@deepseek-ai/dsh-session-title'
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/** Options for one deterministic long-chat fixture. */
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export interface ChatScrollFixtureOptions {
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/** Marker namespace, used when two sessions share one browser world. */
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readonly markerPrefix: string
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/** Searchable title projected into the sidebar. */
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readonly title: string
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/** Number of closed turns to generate. */
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readonly turns?: number
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}
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/** Semantic marker helpers returned with a generated fixture. */
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interface ChatScrollMarkers {
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/** Marker painted in the human message for a turn. */
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user(turn: number): string
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/** Marker painted in the final assistant message for a turn. */
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assistant(turn: number): string
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/** Marker painted in one seeded bash call and result. */
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tool(turn: number, index: number): string
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}
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/** Generated JSONL plus the stable facts browser scenarios assert. */
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export interface ChatScrollFixture {
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readonly log: string
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readonly markers: ChatScrollMarkers
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readonly title: string
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readonly turns: number
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}
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const DEFAULT_TURNS = 88
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const TOOL_INTERVAL = 8
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const CODE_INTERVAL = 11
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function text(value: string): { type: 'text'; text: string }[] {
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return [{ type: 'text', text: value }]
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}
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function suffix(turn: number): string {
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return String(turn).padStart(3, '0')
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}
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function markerHelpers(prefix: string): ChatScrollMarkers {
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return {
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user: turn => `CHAT_SCROLL_${prefix}_USER_${suffix(turn)}`,
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assistant: turn => `CHAT_SCROLL_${prefix}_ASSISTANT_${suffix(turn)}`,
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tool: (turn, index) => `CHAT_SCROLL_${prefix}_TOOL_${suffix(turn)}_${String(index)}`,
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}
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}
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function appendRequestHeader(session: Session, turn: number, step: number): void {
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session.append('request/header', {
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header: {
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config: { provider: 'deepseek-official', model: 'deepseek-v4-flash' },
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system: `Synthetic chat-scroll request for turn ${String(turn)}, step ${String(step)}.`,
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},
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reason: turn === 1 && step === 1 ? 'initial' : 'change',
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})
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}
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function appendAssistant(session: Session, turn: number, step: number, body: string): void {
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session.append('assistant/message', {
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turn,
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step,
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message: createAssistantMessage({
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content: text(body),
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source: { provider: 'deepseek-official', model: 'deepseek-v4-flash' },
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}),
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usage: {
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inputTokens: 2_000 + turn * 7,
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outputTokens: 180 + step * 20,
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},
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}, { surfaceOp: 'append' })
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}
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function codeBlock(turn: number): string {
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if (turn % CODE_INTERVAL !== 0) return ''
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const lines = Array.from(
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{ length: 30 },
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(_, index) => `const scroll_case_${suffix(turn)}_${String(index).padStart(2, '0')} = ${String(turn + index)}`,
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)
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return `\n\n\`\`\`ts\n${lines.join('\n')}\n\`\`\``
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}
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function appendToolStep(
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session: Session,
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markers: ChatScrollMarkers,
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turn: number,
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): void {
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const calls = [1, 2].map((index) => {
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const marker = markers.tool(turn, index)
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const callId = CallId(`chat-scroll-${suffix(turn)}-${String(index)}`)
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const args = JSON.stringify({
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command: `printf '${marker}\\n'`,
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description: marker,
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})
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return { args, callId, marker }
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})
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session.append('assistant/message', {
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turn,
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step: 1,
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message: createAssistantMessage({
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content: [
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{ type: 'reasoning', text: `Inspecting two scroll fixtures for turn ${String(turn)}.` },
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...calls.map(call => ({
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type: 'tool-call' as const,
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id: call.callId,
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name: 'bash',
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arguments: call.args,
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})),
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],
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source: { provider: 'deepseek-official', model: 'deepseek-v4-flash' },
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}),
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usage: { inputTokens: 2_000 + turn * 7, outputTokens: 240, reasoningTokens: 30 },
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}, { surfaceOp: 'append' })
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for (const call of calls) {
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const source = session.append('tool/call', {
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turn,
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step: 1,
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callId: call.callId,
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name: 'bash',
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arguments: call.args,
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})
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session.append('tool/result', {
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turn,
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step: 1,
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message: createToolResultMessage({
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callId: call.callId,
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content: text(Array.from(
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{ length: 12 },
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(_, line) => `${call.marker} output line ${String(line + 1).padStart(2, '0')}`,
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).join('\n')),
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isError: false,
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}),
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}, { surfaceOp: 'append', sourceEventSeqs: [source.seq] })
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}
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}
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function fixtureLog(session: Session): string {
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return [
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JSON.stringify({
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type: 'session',
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version: SESSION_FORMAT_VERSION,
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id: '{{sessionId}}',
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createdAt: Date.now() - 60_000,
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cwd: '{{cwd}}',
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delegationDepth: 0,
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}),
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...session.events.map(event => JSON.stringify(event)),
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'',
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].join('\n')
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}
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/**
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* Build a multi-page conversation with prose, fenced code, and paired bash
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* calls/results. Every turn is closed, so cold resume cannot repair or mutate
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* the seed before the browser observes it.
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* @param options - Fixture identity and optional turn count.
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* @returns Canonical JSONL and semantic marker helpers.
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*/
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export function createChatScrollFixture(options: ChatScrollFixtureOptions): ChatScrollFixture {
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const turns = options.turns ?? DEFAULT_TURNS
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const markers = markerHelpers(options.markerPrefix)
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const session = new Session(SessionId(`chat-scroll-${options.markerPrefix.toLowerCase()}-template`))
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for (let turn = 1; turn <= turns; turn += 1) {
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session.append('turn/start', {
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turn,
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trigger: { kind: 'message', source: { kind: 'user' } },
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})
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const user = session.append('user/message', createUserMessage({
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content: text(
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`${markers.user(turn)} Review the long-running conversation state for turn ${String(turn)}. `
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+ 'Keep the visible message stable while history, tools, and new output change around it.',
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),
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source: { kind: 'user' },
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}), { surfaceOp: 'append' })
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if (turn === 1) {
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session.append('session/title', {
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title: options.title,
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messageSeqs: [user.seq],
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source: { kind: 'fallback' },
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})
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}
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session.append('step/start', { turn, step: 1 })
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appendRequestHeader(session, turn, 1)
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if (turn % TOOL_INTERVAL === 0) {
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appendToolStep(session, markers, turn)
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session.append('step/end', { turn, step: 1 })
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session.append('step/start', { turn, step: 2 })
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appendRequestHeader(session, turn, 2)
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appendAssistant(
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session,
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turn,
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2,
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`${markers.assistant(turn)} Both tool results are accounted for. `
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+ `This settled response keeps turn ${String(turn)} identifiable after paging.${codeBlock(turn)}`,
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)
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session.append('step/end', { turn, step: 2 })
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} else {
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appendAssistant(
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session,
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turn,
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1,
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`${markers.assistant(turn)} The conversation remains readable after several paragraphs.\n\n`
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+ `Turn ${String(turn)} deliberately carries enough prose to wrap at narrower viewport widths. `
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+ 'The semantic marker stays near the start so geometry probes can find the same rendered row.\n\n'
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+ `The closing paragraph makes this a realistic assistant response rather than a one-line list item.${codeBlock(turn)}`,
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)
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session.append('step/end', { turn, step: 1 })
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}
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session.append('turn/end', { turn, reason: { kind: 'completed' } })
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}
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return { log: fixtureLog(session), markers, title: options.title, turns }
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}
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