diff --git a/.editorconfig b/.editorconfig
index 9495107..83c1115 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -6,4 +6,4 @@ end_of_line = lf
 insert_final_newline = true
 indent_style = space
 indent_size = 2
-trim_trailing_whitespace = true
\ No newline at end of file
+trim_trailing_whitespace = true
diff --git a/.gitignore b/.gitignore
index 233829b..d69a4c0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 deno.d.ts
 .vscode
-.local
\ No newline at end of file
+.local
diff --git a/run b/run
index ada1af1..74d1c6d 100755
--- a/run
+++ b/run
@@ -16,4 +16,4 @@ else
 fi
 
 denoargs="$(cat config/$denocmd.flags 2> /dev/null) $denoargs $@"
-exec deno $denocmd $denoargs
\ No newline at end of file
+exec deno $denocmd $denoargs
diff --git a/src/normalize.ts b/src/normalize.ts
index 41cc129..f513f50 100755
--- a/src/normalize.ts
+++ b/src/normalize.ts
@@ -42,6 +42,13 @@ export class ProjectNormalizer {
     await this.formatPath(path);
   }
 
+  async writeLines(path: string, lines: string[]) {
+    await this.sys.writeTextFile(
+      path,
+      lines.concat("").join("\n"),
+    );
+  }
+
   async formatPath(path: string) {
     await this.sys.run({
       cmd: ["./run", "fmt", "-q", path],
@@ -49,7 +56,7 @@ export class ProjectNormalizer {
   }
 
   async updateRunScript() {
-    await this.sys.writeTextFile(
+    await this.writeLines(
       "run",
       [
         `#!/bin/sh`,
@@ -71,7 +78,7 @@ export class ProjectNormalizer {
         ``,
         `denoargs="$(cat config/$denocmd.flags 2> /dev/null) $denoargs $@"`,
         `exec deno $denocmd $denoargs`,
-      ].join("\n"),
+      ],
     );
     await this.sys.chmod("run", 0o755);
   }
@@ -86,7 +93,7 @@ export class ProjectNormalizer {
   }
 
   async updateEditorConfig() {
-    await this.sys.writeTextFile(
+    await this.writeLines(
       ".editorconfig",
       [
         `root = true`,
@@ -98,7 +105,7 @@ export class ProjectNormalizer {
         `indent_style = space`,
         `indent_size = 2`,
         `trim_trailing_whitespace = true`,
-      ].join("\n"),
+      ],
     );
   }
 
@@ -168,25 +175,25 @@ export class ProjectNormalizer {
   }
 
   async updateGitIgnore() {
-    await this.sys.writeTextFile(
+    await this.writeLines(
       ".gitignore",
       [
         `deno.d.ts`,
         `.vscode`,
         `.local`,
-      ].join("\n"),
+      ],
     );
   }
 
   async updateGitHooks() {
-    await this.sys.writeTextFile(
+    await this.writeLines(
       ".git/hooks/pre-commit",
       [
         `#!/bin/sh`,
         `set -e`,
         `./run fmt --check`,
         `./run test`,
-      ].join("\n"),
+      ],
     );
     await this.sys.chmod(".git/hooks/pre-commit", 0o755);
   }
@@ -203,13 +210,13 @@ export class ProjectNormalizer {
         }
       }
     }
-    await this.sys.writeTextFile(
+    await this.writeLines(
       "README.md",
       [
         `# typescript/${project}`,
         `[![Build Status](https://thunderk.visualstudio.com/typescript/_apis/build/status/${project}?branchName=master)](https://dev.azure.com/thunderk/typescript/_build?pipelineNameFilter=${project})`,
         sections,
-      ].join("\n"),
+      ],
     );
     await this.formatPath("README.md");
   }