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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106import assert from "node:assert/strict"import test from "node:test"import { stripVTControlCharacters as strip } from "node:util"import { color, wrap, renderToolProgress, renderEntry, type Entry } from "./transcript.js"const flags = { thinking: true, tools: false }const tool = (result: string): Entry => ({ kind: "tool", name: "python", args: { code: 'print("hi")' }, result })
test("a single huge python repr is capped by wrapped terminal rows, not source lines", () => { const entry = tool("x".repeat(1_000)) const rows = renderEntry(entry, flags, "niri", 40).map(strip) assert.equal(rows[0], "python · 1 line") assert.equal(rows.length, 5) assert.match(rows[4]!, /22 rows hidden/) assert.ok(rows.every(row => row.length <= 40)) assert.ok(renderEntry(entry, { ...flags, tools: true }, "niri", 40).length > 25)})
test("ansi and wide characters wrap within the preview budget, and errors keep their tail", () => { const rows = renderEntry(tool("\x1b[32m" + "界".repeat(60) + "\x1b[0m"), flags, "niri", 20).map(strip) assert.equal(rows.slice(1, 4).join(""), "界".repeat(30)) const error = renderEntry(tool("error:\n" + "noise\n".repeat(20) + "final failure"), flags, "niri", 60).map(strip) assert.match(error[0]!, /failed/) assert.equal(error.at(-1), "final failure")})
test("execution evidence replaces raw repr with actions and bounded per-cell diffs", () => { const entry: Entry = { ...tool("raw python repr"), kind: "tool", name: "python", args: {}, result: "raw python repr", trace: { activities: [{ kind: "read", target: "src/app.ts" }, { kind: "search", target: "timer in src" }], changes: [{ kind: "diff", path: "app.ts", added: 12, removed: 1, diff: "@@ -1 +1 @@\n-old\n" + "+new\n".repeat(12).trimEnd() }], } } const rows = renderEntry(entry, flags, "niri", 80).map(strip) assert.deepEqual(rows, ["read src/app.ts", "search timer in src", "edited app.ts +12 −1"]) assert.equal(rows.includes("raw python repr"), false) const expanded = renderEntry(entry, { ...flags, tools: true }, "niri", 80).map(strip) assert.ok(expanded.includes("raw python repr")) assert.equal(expanded.some(row => row.includes("+new")), false) const diffs = renderEntry(entry, { ...flags, diffs: true }, "niri", 80).map(strip) assert(diffs.some(row => row.includes("new")))})
test("read and edit of the same file share one compact row", () => { const entry: Entry = { kind: "tool", name: "python", args: {}, result: "ok", trace: { activities: [{ kind: "read", target: "file.py" }], changes: [{ kind: "diff", path: "file.py", diff: "-old\n+new", added: 1, removed: 1 }], } } assert.deepEqual(renderEntry(entry, flags, "albedo", 80).map(strip), ["read + edited file.py +1 −1"]) assert(renderEntry(entry, { ...flags, tools: true }, "albedo", 80).map(strip).includes(" read file.py")) assert(!renderEntry(entry, { ...flags, tools: true }, "albedo", 80).map(strip).some(row => row.includes("+new"))) assert(renderEntry(entry, { ...flags, tools: true, diffs: true }, "albedo", 80).map(strip).some(row => row.includes("new")))})
test("compact edits stay one row while expanded diffs preserve ANSI, tabs and wrapping", () => { const diff = ["@@ -1 +1 @@", "-old", "+short", "+\tindented", "+" + "界".repeat(40), "+\x1b[1mbold\x1b[0m", ...Array.from({ length: 40 }, (_, i) => `+line ${i} ` + "x".repeat(i))].join("\n") const entry: Entry = { kind: "tool", name: "python", args: {}, result: "ok", trace: { activities: [], changes: [{ kind: "diff", path: "file", diff, added: 45, removed: 1 }], } } for (const width of [1, 20, 96]) { const compact: string[] = renderEntry(entry, flags, "niri", width).map(strip) assert.equal(compact.length, 1) assert(compact[0]!.length <= width) if (width === 96) assert.equal(compact[0], "edited file +45 −1") const expanded = renderEntry(entry, { ...flags, diffs: true }, "niri", width).map(strip) assert(expanded.length > compact.length) if (width === 96) { assert(expanded.some(row => row.includes("1 - old"))) assert(expanded.some(row => row.includes("1 + short"))) assert(expanded.some(row => row.includes("indented"))) } }})
test("live actions occupy exactly one bounded row, including wide filenames and controls", () => { const progress = { callId: "1", name: "python", phase: "generating" as const, intent: { kind: "write" as const, target: "页面".repeat(50) + "\n\x1b[31m.html" } } const row = strip(renderToolProgress(progress, 30)) assert.equal(row.split("\n").length, 1) assert.match(row, /^writing /) assert.match(row, /…$/) assert.equal(strip(renderToolProgress(progress, 1)), "…")})
test("message clocks sit at the viewport edge without widening body text", async () => { const { default: stringWidth } = await import("string-width") const { messageHeading } = await import("./transcript.js") const timestamp = new Date(2026, 8, 21, 0, 58, 30).getTime() const rows = renderEntry({ kind: "assistant", text: "word ".repeat(40), timestamp }, flags, "albedo", 40, 120) assert.equal(strip(rows[0]!).slice(-8), "00:58:30") assert.equal(stringWidth(rows[0]!), 120) assert(rows.slice(1).every(row => stringWidth(row) <= 40)) assert.equal(strip(messageHeading("you", 96, 120)), "you") assert.equal(strip(messageHeading("you", 96, 120, NaN)), "you") for (const width of [1, 8, 11, 20, 120]) { const heading = messageHeading("界é👩💻".repeat(12), 96, width, timestamp) assert(stringWidth(heading) <= width) assert(!strip(heading).includes("\n")) }})
test("images a tool returned are listed by metadata after its output", () => { const entry: Entry = { kind: "tool", name: "python", args: {}, result: "ok", images: [{ mimeType: "image/png", width: 640, height: 480, bytes: 2048 }] } const rows = renderEntry(entry, flags, "niri", 60).map(strip) assert.equal(rows.at(-1), "image PNG 640×480 · 2 KB")})