Refactor rollup.config.js

Co-authored-by: Shirasawa <764798966@qq.com>

rollup.config.js

@@ -3,48 +3,56 @@ import typescript from "rollup-plugin-typescript2";
 import resolve from "@rollup/plugin-node-resolve";
 import license from "rollup-plugin-license";
 
-const base = {
-	input: "src/skinview3d.ts",
-	output: [
-		{
-			format: "umd",
-			name: "skinview3d",
-			file: "dist/skinview3d.js",
-			indent: "\t",
-			globals: {
-				"three": "THREE"
-			}
-		},
-		{
-			format: "es",
-			file: "dist/skinview3d.module.js",
-			indent: "\t"
-		}
-	],
-	external: [
-		"three"
-	],
-	plugins: [
-		resolve(),
-		typescript(),
-		license({
-			banner: `
+const umd = {
+	format: "umd",
+	name: "skinview3d",
+	indent: "\t",
+	globals: {
+		"three": "THREE"
+	}
+};
+
+const es = {
+	format: "es",
+	indent: "\t"
+};
+
+const licensePlugin = license({
+	banner: `
 				skinview3d (https://github.com/bs-community/skinview3d)
 
 				MIT License
 				`
-		})
+});
+
+const base = {
+	input: "src/skinview3d.ts",
+	external: [
+		"three"
 	]
 };
 
 export default [
-	base,
-	Object.assign({}, base, {
-		output: Object.assign({}, base.output[0], { file: "dist/skinview3d.min.js" }),
-		plugins: (() => {
-			const plugin = base.plugins.slice();
-			plugin.splice(1, 0, terser());
-			return plugin;
-		})()
-	})
+	{
+		...base,
+		output: [
+			{ ...umd, file: "dist/skinview3d.js" },
+			{ ...es, file: "dist/skinview3d.module.js" }
+		],
+		plugins: [
+			resolve(),
+			typescript(),
+			licensePlugin
+		]
+	},
+	{
+		...base,
+		output: { ...umd, file: "dist/skinview3d.min.js" },
+		plugins: [
+			resolve(),
+			typescript(),
+			terser(),
+			licensePlugin
+		]
+	}
 ];