diff --git a/tools/.eslintrc.js b/tools/.eslintrc.js
deleted file mode 100644
index 620617f..0000000
--- a/tools/.eslintrc.js
+++ /dev/null
@@ -1,5 +0,0 @@
-module.exports = {
-	"env": {
-		"node": true
-	}
-}
diff --git a/tools/rollup-util.js b/tools/rollup-util.js
deleted file mode 100644
index 63c74d6..0000000
--- a/tools/rollup-util.js
+++ /dev/null
@@ -1,76 +0,0 @@
-import { uglify } from "rollup-plugin-uglify";
-import babel from "rollup-plugin-babel";
-import resolve from "rollup-plugin-node-resolve";
-import license from "rollup-plugin-license";
-import fs from "fs";
-
-let buildType = config => {
-	let options = {
-		input: "build/skinview3d.js",
-		output: [],
-		external: [
-			"three"
-		],
-		plugins: [
-			resolve()
-		]
-	};
-
-	switch (config.format) {
-		case "umd":
-			options.output.push({
-				format: "umd",
-				name: "skinview3d",
-				file: `build/skinview3d${config.postfix}.js`,
-				indent: "\t",
-				sourcemap: true,
-				globals: {
-					"three": "THREE"
-				}
-			});
-			break;
-
-		case "es":
-			options.output.push({
-				format: "es",
-				file: `build/skinview3d${config.postfix}.js`,
-				indent: "\t",
-				sourcemap: true,
-			});
-			break;
-
-		default:
-			throw `Unknown format: ${config.format}`;
-	}
-
-	if (config.babel) {
-		options.plugins.push(
-			babel({
-				exclude: "node_modules/**"
-			})
-		);
-	}
-
-	if (config.uglify) {
-		options.plugins.push(
-			uglify({
-				output: {
-					comments: "some"
-				}
-			})
-		);
-	}
-
-	options.plugins.push(
-		license({
-			sourcemap: true,
-			banner: `
-				skinview3d (https://github.com/to2mbn/skinview3d)
-
-				${fs.readFileSync("LICENSE").toString()}
-				`
-		})
-	);
-	return options;
-};
-export { buildType };
diff --git a/tools/rollup.browser.js b/tools/rollup.browser.js
deleted file mode 100644
index 50cfc2d..0000000
--- a/tools/rollup.browser.js
+++ /dev/null
@@ -1,7 +0,0 @@
-import { buildType } from "./rollup-util";
-export default buildType({
-	postfix: ".browser",
-	babel: true,
-	uglify: false,
-	format: "umd"
-});
diff --git a/tools/rollup.browser.min.js b/tools/rollup.browser.min.js
deleted file mode 100644
index 7b40d67..0000000
--- a/tools/rollup.browser.min.js
+++ /dev/null
@@ -1,7 +0,0 @@
-import { buildType } from "./rollup-util";
-export default buildType({
-	postfix: ".browser.min",
-	babel: true,
-	uglify: true,
-	format: "umd"
-});
diff --git a/tools/rollup.module.js b/tools/rollup.module.js
deleted file mode 100644
index 359afc3..0000000
--- a/tools/rollup.module.js
+++ /dev/null
@@ -1,7 +0,0 @@
-import { buildType } from "./rollup-util";
-export default buildType({
-	postfix: ".module",
-	babel: true,
-	uglify: false,
-	format: "es"
-});