fix(coding-agent): align stripAnsi with strip-ansi

packages/coding-agent/test/ansi-utils.test.ts

@@ -1,7 +1,95 @@
 import { describe, expect, it } from "vitest";
 import { stripAnsi } from "../src/utils/ansi.js";
 
+function referenceAnsiRegex(): RegExp {
+	const ST = "(?:\\u0007|\\u001B\\u005C|\\u009C)";
+	const osc = `(?:\\u001B\\][\\s\\S]*?${ST})`;
+	const csi = "[\\u001B\\u009B][[\\]()#;?]*(?:\\d{1,4}(?:[;:]\\d{0,4})*)?[\\dA-PR-TZcf-nq-uy=><~]";
+	return new RegExp(`${osc}|${csi}`, "g");
+}
+
+const referenceRegex = referenceAnsiRegex();
+
+function referenceStripAnsi(value: string): string {
+	if (!value.includes("\u001B") && !value.includes("\u009B")) {
+		return value;
+	}
+	return value.replace(referenceRegex, "");
+}
+
+function getCompatibilityInputs(): string[] {
+	const inputs = [
+		"plain",
+		"a\x1b[31mred\x1b[0mz",
+		"a\x1b]8;;https://example.com\x07link\x1b]8;;\x07z",
+		"a\x1b]unterminated",
+		"a\x1b]funterminated",
+		"a\x1bPabc\x1b\\z",
+		"a\x1b^abc\x07z",
+		"a\x1b_abc\x9cz",
+		"a\x90abc\x9cz",
+		"a\x9dabc\x9cz",
+		"a\x9b31mred",
+		"a\x1b(0x",
+		"a\x1b*0x",
+		"a\x1b+c",
+		"a\x1b/0x",
+		"a\x1bcok",
+		"a\x1b\\ok",
+	];
+	const chars = [
+		"a",
+		"f",
+		"0",
+		"1",
+		";",
+		":",
+		"[",
+		"]",
+		"(",
+		")",
+		"#",
+		"?",
+		"m",
+		"P",
+		"_",
+		"\\",
+		"\x07",
+		"\x1b",
+		"\x9b",
+		"\x9c",
+		"\x90",
+		"\x9d",
+	];
+
+	for (const char of chars) {
+		inputs.push(`x\x1b${char}y`);
+		inputs.push(`x\x9b${char}y`);
+		for (let index = 0; index < chars.length; index += 3) {
+			inputs.push(`x\x1b${char}${chars[index]}y`);
+		}
+	}
+
+	return inputs;
+}
+
 describe("stripAnsi", () => {
+	it("matches chalk strip-ansi for generated compatibility inputs", () => {
+		for (const input of getCompatibilityInputs()) {
+			expect(stripAnsi(input)).toBe(referenceStripAnsi(input));
+		}
+	});
+
+	it("throws the same TypeError as chalk strip-ansi for non-string values", () => {
+		const stripAnsiUnknown = stripAnsi as (value: unknown) => string;
+
+		for (const value of [undefined, null, 123, {}, Object("x")]) {
+			const message = `Expected a \`string\`, got \`${typeof value}\``;
+			expect(() => stripAnsiUnknown(value)).toThrow(TypeError);
+			expect(() => stripAnsiUnknown(value)).toThrow(message);
+		}
+	});
+
 	it("strips RIS without leaking the final byte", () => {
 		expect(stripAnsi("\x1bcdone")).toBe("done");
 	});