Breaking: drop Node.js 4 support

Author: mysticatea

.travis.yml

@@ -2,7 +2,6 @@ sudo: false
 
 language: node_js
 node_js:
-  - "4"
-  - "6"
+  - "6.5"
   - "8"
-  - "9"
+  - "10"

package.json

@@ -3,7 +3,7 @@
   "version": "1.1.0",
   "description": "Regular expression parser for ECMAScript 2018.",
   "engines": {
-    "node": ">=4.0.0"
+    "node": ">=6.5.0"
   },
   "main": "index",
   "files": [
@@ -14,10 +14,6 @@
     "@types/eslint": "^4.16.0",
     "@types/mocha": "^2.2.48",
     "@types/node": "^9.4.6",
-    "babel-core": "^6.26.0",
-    "babel-plugin-transform-es2015-destructuring": "^6.23.0",
-    "babel-plugin-transform-es2015-parameters": "^6.24.1",
-    "babel-plugin-transform-es2015-spread": "^6.22.0",
     "dts-bundle": "^0.7.3",
     "eslint": "^4.18.0",
     "eslint-config-mysticatea": "^13.0.2",
@@ -28,7 +24,6 @@
     "prettier": "^1.9.2",
     "rimraf": "^2.6.2",
     "rollup": "^0.56.1",
-    "rollup-plugin-babel": "^3.0.3",
     "rollup-plugin-node-resolve": "^3.0.3",
     "rollup-plugin-sourcemaps": "^0.4.2",
     "rollup-watch": "^4.3.1",
@@ -40,8 +35,7 @@
     "prebuild": "npm run -s clean",
     "build": "run-s build:*",
     "build:tsc": "tsc --module es2015 --target es2015",
-    "build:mjs": "rollup -c rollup-mjs.config.js",
-    "build:js": "rollup -c rollup-js.config.js",
+    "build:rollup": "rollup -c",
     "build:dts": "dts-bundle --name regexpp --main .temp/index.d.ts --out ../index.d.ts",
     "clean": "rimraf .temp index.*",
     "lint": "eslint src test tools --ext .ts",

rollup-js.config.js

@@ -0,0 +1,27 @@
+import resolve from "rollup-plugin-node-resolve"
+import sourcemaps from "rollup-plugin-sourcemaps"
+
+export default [
+    {
+        input: ".temp/index.js",
+        output: {
+            file: "index.js",
+            format: "cjs",
+            sourcemap: true,
+            sourcemapFile: "index.js.map",
+            banner: `/*! @author Toru Nagashima <https://github.com/mysticatea> */`,
+        },
+        plugins: [sourcemaps(), resolve()],
+    },
+    {
+        input: ".temp/index.js",
+        output: {
+            file: "index.mjs",
+            format: "es",
+            sourcemap: true,
+            sourcemapFile: "index.mjs.map",
+            banner: `/*! @author Toru Nagashima <https://github.com/mysticatea> */`,
+        },
+        plugins: [sourcemaps(), resolve()],
+    },
+]