fix(rules): `no-trailing-whitespace` handles CRLF (windows) newlines

fixes #93

src/rules/no-trailing-whitespace.spec.ts

@@ -10,34 +10,48 @@ describe("rule no-trailing-whitespace", () => {
 		});
 	});
 
-	it("should not report when there is no trailing whitespace", () => {
-		expect.assertions(1);
-		const report = htmlvalidate.validateString("<div>\n  foo\n</div>");
-		expect(report).toBeValid();
-	});
+	describe.each`
+		newline   | description
+		${"\n"}   | ${"LR"}
+		${"\r\n"} | ${"CRLF"}
+	`("$description", ({ newline }) => {
+		it("should not report when there is no trailing whitespace", () => {
+			expect.assertions(1);
+			const report = htmlvalidate.validateString(
+				`<div>${newline}  foo${newline}</div>`
+			);
+			expect(report).toBeValid();
+		});
 
-	it("should report error when tag have trailing whitespace", () => {
-		expect.assertions(2);
-		const report = htmlvalidate.validateString("<p>  \n</p>");
-		expect(report).toBeInvalid();
-		expect(report).toHaveError("no-trailing-whitespace", "Trailing whitespace");
-	});
+		it("should report error when tag have trailing whitespace", () => {
+			expect.assertions(2);
+			const report = htmlvalidate.validateString(`<p>  ${newline}</p>`);
+			expect(report).toBeInvalid();
+			expect(report).toHaveError(
+				"no-trailing-whitespace",
+				"Trailing whitespace"
+			);
+		});
 
-	it("should report error when empty line have trailing whitespace", () => {
-		expect.assertions(2);
-		const report = htmlvalidate.validateString("<p>\n  \n</p>");
-		expect(report).toBeInvalid();
-		expect(report).toHaveError("no-trailing-whitespace", "Trailing whitespace");
-	});
+		it("should report error when empty line have trailing whitespace", () => {
+			expect.assertions(2);
+			const report = htmlvalidate.validateString(`<p>${newline}  \n</p>`);
+			expect(report).toBeInvalid();
+			expect(report).toHaveError(
+				"no-trailing-whitespace",
+				"Trailing whitespace"
+			);
+		});
 
-	it("should report error for both tabs and spaces", () => {
-		expect.assertions(2);
-		const report = htmlvalidate.validateString("<p>\n  \n\t\n</p>");
-		expect(report).toBeInvalid();
-		expect(report).toHaveErrors([
-			["no-trailing-whitespace", "Trailing whitespace"],
-			["no-trailing-whitespace", "Trailing whitespace"],
-		]);
+		it("should report error for both tabs and spaces", () => {
+			expect.assertions(2);
+			const report = htmlvalidate.validateString("<p>\n  \n\t\n</p>");
+			expect(report).toBeInvalid();
+			expect(report).toHaveErrors([
+				["no-trailing-whitespace", "Trailing whitespace"],
+				["no-trailing-whitespace", "Trailing whitespace"],
+			]);
+		});
 	});
 
 	it("smoketest", () => {

src/rules/no-trailing-whitespace.ts

@@ -12,7 +12,7 @@ export default class NoTrailingWhitespace extends Rule {
 
 	public setup(): void {
 		this.on("whitespace", (event: WhitespaceEvent) => {
-			if (event.text.match(/^[ \t]+\n$/)) {
+			if (event.text.match(/^[ \t]+\r?\n$/)) {
 				this.report(undefined, "Trailing whitespace", event.location);
 			}
 		});