fix(site): improve check-compiler.mjs quality and fix bugs (#23812)

site/scripts/check-compiler.test.mjs

@@ -0,0 +1,95 @@
+import { describe, expect, it } from "vitest";
+import {
+	deduplicateDiagnostics,
+	shortPath,
+	shortenMessage,
+} from "./check-compiler.mjs";
+
+describe("shortenMessage", () => {
+	it("strips Error: prefix and takes first sentence", () => {
+		expect(
+			shortenMessage(
+				"Error: Ref values are not allowed. Use ref types instead.",
+			),
+		).toBe("Ref values are not allowed");
+	});
+
+	it("strips trailing URL references", () => {
+		expect(
+			shortenMessage("Mutating a value returned from a hook(https://react.dev/reference)"),
+		).toBe("Mutating a value returned from a hook");
+	});
+
+	it("preserves dotted property paths", () => {
+		expect(
+			shortenMessage("Cannot destructure props.foo because it is null"),
+		).toBe("Cannot destructure props.foo because it is null");
+	});
+
+	it("coerces non-string values", () => {
+		expect(shortenMessage(42)).toBe("42");
+		expect(shortenMessage({ toString: () => "Error: obj. detail" })).toBe("obj");
+	});
+
+	it("normalizes trailing periods", () => {
+		expect(shortenMessage("Single sentence.")).toBe("Single sentence");
+	});
+
+	it("returns (unknown) for empty input", () => {
+		expect(shortenMessage("")).toBe("");
+		expect(shortenMessage("(unknown)")).toBe("(unknown)");
+	});
+});
+
+describe("deduplicateDiagnostics", () => {
+	it("removes duplicates with same line and message", () => {
+		const input = [
+			{ line: 1, short: "error A" },
+			{ line: 1, short: "error A" },
+			{ line: 2, short: "error B" },
+		];
+		expect(deduplicateDiagnostics(input)).toEqual([
+			{ line: 1, short: "error A" },
+			{ line: 2, short: "error B" },
+		]);
+	});
+
+	it("keeps diagnostics with same message on different lines", () => {
+		const input = [
+			{ line: 1, short: "error A" },
+			{ line: 2, short: "error A" },
+		];
+		expect(deduplicateDiagnostics(input)).toEqual(input);
+	});
+
+	it("keeps diagnostics with same line but different messages", () => {
+		const input = [
+			{ line: 1, short: "error A" },
+			{ line: 1, short: "error B" },
+		];
+		expect(deduplicateDiagnostics(input)).toEqual(input);
+	});
+
+	it("returns empty array for empty input", () => {
+		expect(deduplicateDiagnostics([])).toEqual([]);
+	});
+});
+
+describe("shortPath", () => {
+	const dirs = ["src/pages/AgentsPage", "src/pages/Other"];
+
+	it("strips matching target dir prefix", () => {
+		expect(shortPath("src/pages/AgentsPage/components/Chat.tsx", dirs))
+			.toBe("components/Chat.tsx");
+	});
+
+	it("strips first matching prefix when multiple match", () => {
+		expect(shortPath("src/pages/Other/index.tsx", dirs))
+			.toBe("index.tsx");
+	});
+
+	it("returns file unchanged when no prefix matches", () => {
+		expect(shortPath("src/utils/helper.ts", dirs))
+			.toBe("src/utils/helper.ts");
+	});
+});