Move app to apps/web-react in pnpm workspace layout

apps/web-react/app/modules/csv.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, test } from "vitest";
+import * as CSV from "./csv";
+
+describe("CSV.serialize", () => {
+	test("joins cells with commas and rows with CRLF", () => {
+		expect(
+			CSV.serialize([
+				["a", "b"],
+				["c", "d"],
+			]),
+		).toBe("a,b\r\nc,d");
+	});
+
+	test("quotes cells containing the delimiter", () => {
+		expect(CSV.serialize([["a,b", "c"]])).toBe('"a,b",c');
+	});
+
+	test("escapes quotes by doubling them", () => {
+		expect(CSV.serialize([['say "hi"']])).toBe('"say ""hi"""');
+	});
+
+	test("quotes cells containing line breaks", () => {
+		expect(CSV.serialize([["line1\nline2"]])).toBe('"line1\nline2"');
+		expect(CSV.serialize([["line1\rline2"]])).toBe('"line1\rline2"');
+	});
+
+	test("leaves plain cells unquoted", () => {
+		expect(CSV.serialize([["plain", "text"]])).toBe("plain,text");
+	});
+
+	test("handles empty input", () => {
+		expect(CSV.serialize([])).toBe("");
+	});
+
+	test("neutralizes formula injection by prefixing a quote", () => {
+		expect(CSV.serialize([["=1+1"]])).toBe("'=1+1");
+		expect(CSV.serialize([["+1"]])).toBe("'+1");
+		expect(CSV.serialize([["@SUM(A1)"]])).toBe("'@SUM(A1)");
+		expect(CSV.serialize([["=HYPERLINK(1,2)"]])).toBe('"\'=HYPERLINK(1,2)"');
+	});
+
+	test("does not treat negative numbers as formulas", () => {
+		expect(CSV.serialize([["-5"]])).toBe("-5");
+		expect(CSV.serialize([["-5.5"]])).toBe("-5.5");
+	});
+
+	test("guards a leading minus that is not numeric", () => {
+		expect(CSV.serialize([["-cmd"]])).toBe("'-cmd");
+	});
+});