diff --git a/docs/src/pages/reference/cli-reference.md b/docs/src/pages/reference/cli-reference.md
index 26b165f489..0665b35a04 100644
--- a/docs/src/pages/reference/cli-reference.md
+++ b/docs/src/pages/reference/cli-reference.md
@@ -27,7 +27,7 @@ This command is meant for local testing only, and is not designed to be run in p
 
 ### `astro check`
 
-Runs diagnostics (such as type-checking) against your project and reports errors to the console. If any errors are found the process will exit with a code of __1__.
+Runs diagnostics (such as type-checking) against your project and reports errors to the console. If any errors are found the process will exit with a code of **1**.
 
 This command is intended to be used in CI workflows.
 
diff --git a/packages/astro/src/check.ts b/packages/astro/src/check.ts
index 22bccd4f91..6df689d35c 100644
--- a/packages/astro/src/check.ts
+++ b/packages/astro/src/check.ts
@@ -7,25 +7,19 @@ import * as path from 'path';
 import { pathToFileURL } from 'url';
 import * as fs from 'fs';
 
-async function openAllDocuments(
-  workspaceUri: URL,
-  filePathsToIgnore: string[],
-  checker: AstroCheck
-) {
+async function openAllDocuments(workspaceUri: URL, filePathsToIgnore: string[], checker: AstroCheck) {
   const files = await glob('**/*.astro', {
-      cwd: workspaceUri.pathname,
-      ignore: ['node_modules/**'].concat(filePathsToIgnore.map((ignore) => `${ignore}/**`))
+    cwd: workspaceUri.pathname,
+    ignore: ['node_modules/**'].concat(filePathsToIgnore.map((ignore) => `${ignore}/**`)),
   });
   const absFilePaths = files.map((f) => path.resolve(workspaceUri.pathname, f));
 
   for (const absFilePath of absFilePaths) {
-      const text = fs.readFileSync(absFilePath, 'utf-8');
-      checker.upsertDocument(
-          {
-              uri: pathToFileURL(absFilePath).toString(),
-              text
-          }
-      );
+    const text = fs.readFileSync(absFilePath, 'utf-8');
+    checker.upsertDocument({
+      uri: pathToFileURL(absFilePath).toString(),
+      text,
+    });
   }
 }
 
@@ -34,17 +28,17 @@ interface Result {
   warnings: number;
 }
 
-function offsetAt({ line, character }: { line: number, character: number; }, text: string) {
+function offsetAt({ line, character }: { line: number; character: number }, text: string) {
   let i = 0;
   let l = 0;
   let c = 0;
-  while(i < text.length) {
-    if(l === line && c === character) {
+  while (i < text.length) {
+    if (l === line && c === character) {
       break;
     }
 
     let char = text[i];
-    switch(char) {
+    switch (char) {
       case '\n': {
         l++;
         c = 0;
@@ -66,9 +60,7 @@ function pad(str: string, len: number) {
   return Array.from({ length: len }, () => str).join('');
 }
 
-export async function run() {
-
-}
+export async function run() {}
 
 export async function check(astroConfig: AstroConfig) {
   const root = astroConfig.projectRoot;
@@ -79,18 +71,18 @@ export async function check(astroConfig: AstroConfig) {
 
   let result: Result = {
     errors: 0,
-    warnings: 0
+    warnings: 0,
   };
 
-  diagnostics.forEach(diag => {
-    diag.diagnostics.forEach(d => {
-      switch(d.severity) {
+  diagnostics.forEach((diag) => {
+    diag.diagnostics.forEach((d) => {
+      switch (d.severity) {
         case DiagnosticSeverity.Error: {
           console.error(`${bold(cyan(path.relative(root.pathname, diag.filePath)))}:${bold(yellow(d.range.start.line))}:${bold(yellow(d.range.start.character))} - ${d.message}`);
           let startOffset = offsetAt({ line: d.range.start.line, character: 0 }, diag.text);
           let endOffset = offsetAt({ line: d.range.start.line + 1, character: 0 }, diag.text);
           let str = diag.text.substring(startOffset, endOffset - 1);
-          const lineNumStr = (d.range.start.line).toString();
+          const lineNumStr = d.range.start.line.toString();
           const lineNumLen = lineNumStr.length;
           console.error(`${bgWhite(black(lineNumStr))}  ${str}`);
           let tildes = pad('~', d.range.end.character - d.range.start.character);
@@ -107,10 +99,10 @@ export async function check(astroConfig: AstroConfig) {
     });
   });
 
-  if(result.errors) {
-    console.error(`Found ${result.errors} errors.`)
+  if (result.errors) {
+    console.error(`Found ${result.errors} errors.`);
   }
 
   const exitCode = result.errors ? 1 : 0;
   return exitCode;
-}
\ No newline at end of file
+}
diff --git a/packages/astro/src/cli.ts b/packages/astro/src/cli.ts
index d49381520e..5c82f3af49 100644
--- a/packages/astro/src/cli.ts
+++ b/packages/astro/src/cli.ts
@@ -134,7 +134,7 @@ const cmdMap = new Map<string, (a: AstroConfig, opts?: any) => Promise<any>>([
   ['dev', devServer],
   ['preview', preview],
   ['reload', reloadAndExit],
-  ['check', checkAndExit]
+  ['check', checkAndExit],
 ]);
 
 /** The primary CLI action */