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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960import assert from "node:assert/strict"import test from "node:test"import { PassThrough } from "node:stream"import { setImmediate as immediate } from "node:timers/promises"import { createElement } from "react"import { render } from "ink"import headless from "@xterm/headless"import type { ChatClient, StreamEvent } from "../client.js"import { ChatScreen } from "./chat.js"import { terminalRendering } from "./terminal-rendering.js"
test("incremental terminal output survives reflow with its composer and history anchor intact", async t => { const terminal = new headless.Terminal({ cols: 100, rows: 30, allowProposedApi: true, convertEol: true }) const stdin = Object.assign(new PassThrough(), { isTTY: true, setRawMode: () => stdin, ref: () => stdin, unref: () => stdin }) as unknown as NodeJS.ReadStream const stdout = Object.assign(new PassThrough(), { isTTY: true, columns: 100, rows: 30 }) as unknown as NodeJS.WriteStream stdout.on("data", (data: Buffer) => terminal.write(data)) let emit!: (event: StreamEvent) => void let connect!: () => void const connected = new Promise<void>(resolve => { connect = resolve }) const transport: ChatClient = { send: async () => ({ ok: true }), getStatus: async () => ({ running: false, idle: true }), stream: async ({ onEvent, signal, onOpen }) => { emit = onEvent; onOpen?.(); connect() await new Promise<void>(resolve => signal?.addEventListener("abort", () => resolve(), { once: true })) }, } const app = render(createElement(ChatScreen, { transport, agentName: "niri", workspace: "/a/very/long/workspace/path", model: "openai-codex/gpt-5.6-luna", onBack() {}, onQuit() {}, settleMs: 100_000, }), { stdin, stdout, patchConsole: false, exitOnCtrlC: false, ...terminalRendering }) t.after(() => { app.unmount(); terminal.dispose() }) const flush = async () => { await immediate(); await app.waitUntilRenderFlush(); await immediate(); await app.waitUntilRenderFlush() await new Promise<void>(resolve => terminal.write("", resolve)) } const frame = () => Array.from({ length: terminal.rows }, (_, row) => terminal.buffer.active.getLine(terminal.buffer.active.viewportY + row)!.translateToString(true)) await connected for (let id = 0; id < 100; id++) emit({ type: "message", role: "assistant", text: `record ${id}\n` + "context and behavior remain unchanged. ".repeat(4) }) await flush() stdin.write("\x1b[5~"); await flush() stdin.write("draft remains"); await flush() const anchor = frame().join("\n").match(/record \d+/)?.[0] assert.ok(anchor) for (const [width, height] of [[52, 30], [80, 40], [40, 20], [100, 30]] as const) { terminal.resize(width, height) stdout.columns = width stdout.rows = height stdout.emit("resize") await flush() const lines = frame() assert.match(lines[0]!, /niri/, `header at ${width}: ${lines.join("\n")}`) assert.equal(lines[1], "", "reflowed old content cannot survive in the header gap") assert.match(lines[height - 2]!, /› draft remains/, `composer at ${width}: ${lines.join("\n")}`) assert.match(lines[height - 1]!, /\/ commands/) assert.equal(lines.join("\n").match(/record \d+/)?.[0], anchor, `history anchor at ${width}`) stdin.write("\x1b[<64;10;8M\x1b[<65;10;8M"); await flush() assert.match(frame()[height - 2]!, /› draft remains/, "unchanged rows still occupy their correct positions") }})