diff --git a/.npmignore b/.npmignore
index 60d2672..570901d 100644
--- a/.npmignore
+++ b/.npmignore
@@ -17,3 +17,7 @@ dist
 /.projenrc.js
 tsconfig.tsbuildinfo
 /.eslintrc.json
+/docs/
+/.editorconfig
+/.prettier*
+/coverage/
diff --git a/.projenrc.js b/.projenrc.js
index b4798aa..57e9b08 100644
--- a/.projenrc.js
+++ b/.projenrc.js
@@ -32,6 +32,13 @@ const project = new typescript.TypeScriptProject({
   minNodeVersion: "14.18.0",
 });
 
+// Docs.
+project.npmignore?.addPatterns("/docs/");
+
+// Lint.
+project.npmignore?.addPatterns("/.editorconfig");
+project.npmignore?.addPatterns("/.prettier*");
+
 // ESM.
 project.addFields({
   type: "module",
@@ -54,6 +61,8 @@ project.compileTask.prependExec(
 );
 
 // Test.
+project.npmignore?.addPatterns("/coverage/");
+
 project.addDevDeps("vitest", "c8");
 project.testTask.exec("vitest test/rules --passWithNoTests --coverage --run");