Update to use only babel 7 and babel eslint config and prettier

.editorconfig

@@ -1,12 +1,14 @@
 root = true
 
 [*]
-indent_style = tab
-end_of_line = lf
+insert_final_newline = true
 charset = utf-8
 trim_trailing_whitespace = true
-insert_final_newline = true
+end_of_line = lf
 
-[{package.json,*.yml}]
+[*.{js,json}]
 indent_style = space
 indent_size = 2
+
+[*.{md,markdown}]
+trim_trailing_whitespace = false

.eslintignore

@@ -0,0 +1,3 @@
+node_modules
+/test/tmp
+/test/fixtures

.eslintrc.json

@@ -0,0 +1,13 @@
+{
+    "root": true,
+    "extends": "babel",
+    "plugins": ["prettier"],
+    "rules": {
+      "curly": ["error", "multi-line"],
+      "prettier/prettier": "error",
+      "no-case-declarations": "error"
+    },
+    "env": {
+      "node": true
+    }
+  }

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 /test/tmp
+yarn-error.log

.prettierrc

@@ -0,0 +1,12 @@
+{
+    "arrowParens": "avoid",
+    "trailingComma": "es5",
+    "useTabs": false,
+    "semi": true,
+    "singleQuote": false,
+    "bracketSpacing": true,
+    "jsxBracketSameLine": false,
+    "tabWidth": 2,
+    "parser": "babylon",
+    "printWidth": 80
+}

Gruntfile.js

@@ -1,28 +1,28 @@
-'use strict';
-module.exports = function (grunt) {
-	grunt.initConfig({
-		babel: {
-			compile: {
-				options: {
-					sourceMap: true,
-					presets: ['env']
-				},
-				files: {
-					'test/tmp/fixture-compiled.js': 'test/fixtures/fixture.js'
-				}
-			}
-		},
-		nodeunit: {
-			tasks: ['test/test.js']
-		},
-		clean: {
-			test: ['test/tmp/**']
-		}
-	});
+"use strict";
+module.exports = function(grunt) {
+  grunt.initConfig({
+    babel: {
+      compile: {
+        options: {
+          sourceMap: true,
+          presets: ["@babel/preset-env"],
+        },
+        files: {
+          "test/tmp/fixture-compiled.js": "test/fixtures/fixture.js",
+        },
+      },
+    },
+    nodeunit: {
+      tasks: ["test/test.js"],
+    },
+    clean: {
+      test: ["test/tmp/**"],
+    },
+  });
 
-	grunt.loadTasks('tasks');
-	grunt.loadNpmTasks('grunt-contrib-clean');
-	grunt.loadNpmTasks('grunt-contrib-nodeunit');
+  grunt.loadTasks("tasks");
+  grunt.loadNpmTasks("grunt-contrib-clean");
+  grunt.loadNpmTasks("grunt-contrib-nodeunit");
 
-	grunt.registerTask('default', ['clean', 'babel', 'nodeunit', 'clean']);
+  grunt.registerTask("default", ["clean", "babel", "nodeunit", "clean"]);
 };

package.json

@@ -13,7 +13,9 @@
     "node": ">=4"
   },
   "scripts": {
-    "test": "xo && grunt"
+    "lint": "eslint .",
+    "format": "eslint . --fix",
+    "test": "yarn lint && grunt"
   },
   "files": [
     "tasks"
@@ -32,16 +34,21 @@
     "compiler"
   ],
   "peerDependencies": {
-    "babel-core": "^6.0.0 || ^7.0.0-alpha",
+    "@babel/core": "^7.0.0-0",
     "grunt": ">=0.4.0"
   },
   "devDependencies": {
-    "babel-core": "7.0.0-alpha.19",
-    "babel-preset-env": "2.0.0-alpha.19",
+    "@babel/core": "^7.0.0-beta.42",
+    "@babel/preset-env": "^7.0.0-beta.42",
+    "babel-eslint": "^8.0.0",
+    "eslint": "^4.19.0",
+    "eslint-config-babel": "^7.0.2",
+    "eslint-plugin-flowtype": "^2.46.1",
+    "eslint-plugin-prettier": "^2.6.0",
     "grunt": "^1.0.1",
     "grunt-cli": "^1.2.0",
     "grunt-contrib-clean": "^1.0.0",
     "grunt-contrib-nodeunit": "^1.0.0",
-    "xo": "^0.16.0"
+    "prettier": "^1.11.1"
   }
 }

tasks/babel.js

@@ -1,45 +1,42 @@
-'use strict';
-var path = require('path');
-var babel;
-try {
-	babel = require('@babel/core');
-} catch (error) {
-	try{
-		babel = require('babel-core');
-	} catch (errorSub) {
-		console.error('Please install @babel/core or babel-core');
-		throw error;
-	}	
-}
-
-module.exports = function (grunt) {
-	grunt.registerMultiTask('babel', 'Use next generation JavaScript, today', function () {
-		var options = this.options();
-
-		this.files.forEach(function (el) {
-			delete options.filename;
-			delete options.filenameRelative;
-
-			options.sourceFileName = path.relative(path.dirname(el.dest), el.src[0]);
-
-			if (process.platform === 'win32') {
-				options.sourceFileName = options.sourceFileName.replace(/\\/g, '/');
-			}
-
-			options.sourceMapTarget = path.basename(el.dest);
-
-			var res = babel.transformFileSync(el.src[0], options);
-			var sourceMappingURL = '';
-
-			if (res.map) {
-				sourceMappingURL = '\n//# sourceMappingURL=' + path.basename(el.dest) + '.map';
-			}
-
-			grunt.file.write(el.dest, res.code + sourceMappingURL + '\n');
-
-			if (res.map) {
-				grunt.file.write(el.dest + '.map', JSON.stringify(res.map));
-			}
-		});
-	});
+"use strict";
+const path = require("path");
+const babel = require("@babel/core");
+
+module.exports = function(grunt) {
+  grunt.registerMultiTask(
+    "babel",
+    "Use next generation JavaScript, today",
+    function() {
+      const options = this.options();
+
+      this.files.forEach(function(el) {
+        delete options.filename;
+        delete options.filenameRelative;
+
+        options.sourceFileName = path.relative(
+          path.dirname(el.dest),
+          el.src[0]
+        );
+
+        if (process.platform === "win32") {
+          options.sourceFileName = options.sourceFileName.replace(/\\/g, "/");
+        }
+
+        const res = babel.transformFileSync(el.src[0], options);
+        let sourceMappingURL = "";
+
+        if (res.map) {
+          sourceMappingURL =
+            "\n//# sourceMappingURL=" + path.basename(el.dest) + ".map";
+        }
+
+        grunt.file.write(el.dest, res.code + sourceMappingURL + "\n");
+
+        if (res.map) {
+          res.map.file = path.basename(el.dest);
+          grunt.file.write(el.dest + ".map", JSON.stringify(res.map));
+        }
+      });
+    }
+  );
 };

test/test.js

@@ -1,17 +1,17 @@
-'use strict';
-var fs = require('fs');
+"use strict";
+const fs = require("fs");
 
 exports.babel = {
-	compile: function (test) {
-		var code = fs.readFileSync('test/tmp/fixture-compiled.js', 'utf8');
-		test.ok(/function/.test(code));
+  compile: function(test) {
+    const code = fs.readFileSync("test/tmp/fixture-compiled.js", "utf8");
+    test.ok(/function/.test(code));
 
-		var map = fs.readFileSync('test/tmp/fixture-compiled.js.map', 'utf8');
-		var json = JSON.parse(map);
+    const map = fs.readFileSync("test/tmp/fixture-compiled.js.map", "utf8");
+    const json = JSON.parse(map);
 
-		test.deepEqual(json.sources, ['../fixtures/fixture.js']);
-		test.deepEqual(json.file, 'fixture-compiled.js');
-		test.ok(/\/\/# sourceMappingURL=fixture-compiled.js.map\n$/.test(code));
-		test.done();
-	}
+    test.deepEqual(json.sources, ["../fixtures/fixture.js"]);
+    test.deepEqual(json.file, "fixture-compiled.js");
+    test.ok(/\/\/# sourceMappingURL=fixture-compiled.js.map\n$/.test(code));
+    test.done();
+  },
 };