diff --git a/packages/astro/src/core/build/generate.ts b/packages/astro/src/core/build/generate.ts
index 2f70b9bf5f..406186a21d 100644
--- a/packages/astro/src/core/build/generate.ts
+++ b/packages/astro/src/core/build/generate.ts
@@ -240,14 +240,21 @@ interface GeneratePathOptions {
 	renderers: SSRLoadedRenderer[];
 }
 
-function shouldAppendForwardSlash(trailingSlash: AstroConfig['trailingSlash'], buildFormat: AstroConfig['build']['format']): boolean {
-	switch(trailingSlash) {
-		case 'always': return true;
-		case 'never': return false;
+function shouldAppendForwardSlash(
+	trailingSlash: AstroConfig['trailingSlash'],
+	buildFormat: AstroConfig['build']['format']
+): boolean {
+	switch (trailingSlash) {
+		case 'always':
+			return true;
+		case 'never':
+			return false;
 		case 'ignore': {
-			switch(buildFormat) {
-				case 'directory': return true;
-				case 'file': return false;
+			switch (buildFormat) {
+				case 'directory':
+					return true;
+				case 'file':
+					return false;
 			}
 		}
 	}
@@ -256,9 +263,9 @@ function shouldAppendForwardSlash(trailingSlash: AstroConfig['trailingSlash'], b
 function addPageName(pathname: string, opts: StaticBuildOptions): void {
 	const trailingSlash = opts.astroConfig.trailingSlash;
 	const buildFormat = opts.astroConfig.build.format;
-	const pageName = shouldAppendForwardSlash(trailingSlash, buildFormat) ?
-		pathname.replace(/\/?$/, '/').replace(/^\//, '') :
-		pathname.replace(/^\//, '')
+	const pageName = shouldAppendForwardSlash(trailingSlash, buildFormat)
+		? pathname.replace(/\/?$/, '/').replace(/^\//, '')
+		: pathname.replace(/^\//, '');
 	opts.pageNames.push(pageName);
 }
 
diff --git a/packages/integrations/sitemap/test/test-utils.js b/packages/integrations/sitemap/test/test-utils.js
index 22c1d19197..31d40de9ef 100644
--- a/packages/integrations/sitemap/test/test-utils.js
+++ b/packages/integrations/sitemap/test/test-utils.js
@@ -19,12 +19,12 @@ export function loadFixture(inlineConfig) {
 
 export function readXML(fileOrPromise) {
 	const parseString = xml2js.parseString;
-	return Promise.resolve(fileOrPromise).then(xml => {
+	return Promise.resolve(fileOrPromise).then((xml) => {
 		return new Promise((resolve, reject) => {
 			parseString(xml, function (err, result) {
-				if(err) return reject(err);
+				if (err) return reject(err);
 				resolve(result);
+			});
 		});
-		})
 	});
 }
diff --git a/packages/integrations/sitemap/test/trailing-slash.test.js b/packages/integrations/sitemap/test/trailing-slash.test.js
index 6b6aa3a352..b5b7dd6c15 100644
--- a/packages/integrations/sitemap/test/trailing-slash.test.js
+++ b/packages/integrations/sitemap/test/trailing-slash.test.js
@@ -12,12 +12,12 @@ describe('Trailing slash', () => {
 					root: './fixtures/trailing-slash/',
 					trailingSlash: 'ignore',
 					build: {
-						format: 'directory'
-					}
+						format: 'directory',
+					},
 				});
 				await fixture.build();
 			});
-		
+
 			it('URLs end with trailing slash', async () => {
 				const data = await readXML(fixture.readFile('/sitemap-0.xml'));
 				const urls = data.urlset.url;
@@ -31,15 +31,15 @@ describe('Trailing slash', () => {
 					root: './fixtures/trailing-slash/',
 					trailingSlash: 'ignore',
 					build: {
-						format: 'file'
-					}
+						format: 'file',
+					},
 				});
 				await fixture.build();
 			});
-		
+
 			it('URLs do not end with trailing slash', async () => {
 				const data = await readXML(fixture.readFile('/sitemap-0.xml'));
-				const urls = data.urlset.url;	
+				const urls = data.urlset.url;
 				expect(urls[0].loc[0]).to.equal('http://example.com/one');
 			});
 		});
@@ -53,7 +53,7 @@ describe('Trailing slash', () => {
 			});
 			await fixture.build();
 		});
-	
+
 		it('URLs do no end with trailing slash', async () => {
 			const data = await readXML(fixture.readFile('/sitemap-0.xml'));
 			const urls = data.urlset.url;
@@ -69,7 +69,7 @@ describe('Trailing slash', () => {
 			});
 			await fixture.build();
 		});
-	
+
 		it('URLs end with trailing slash', async () => {
 			const data = await readXML(fixture.readFile('/sitemap-0.xml'));
 			const urls = data.urlset.url;