💥 update dependencies and drop Node 4 support

Some dependencies dropped Node 4 support

.eslintignore

@@ -1,2 +1,6 @@
+/.nyc_output
+/coverage
 /dist
-/scripts/babel-register.js
+/node_modules
+
+!.eslintrc.js

.eslintrc.js

@@ -0,0 +1,35 @@
+/**
+ * @author Toru Nagashima <https://github.com/mysticatea>
+ * See LICENSE file in root directory for full license.
+ */
+"use strict"
+
+const { configs, utils } = require("@mysticatea/eslint-plugin")
+
+module.exports = {
+    root: true,
+    extends: ["plugin:@mysticatea/es2015"],
+    rules: {
+        "import/exports-last": "off",
+        "import/first": "off",
+
+        // To reduce size for babel-translation.
+        "no-restricted-syntax": [
+            "error",
+            "ForOfStatement",
+            "BinaryExpression[left.operator='typeof'][right.value='object']",
+        ],
+        "prefer-rest-params": "off",
+        "prefer-spread": "off",
+        "@mysticatea/prefer-for-of": "off",
+    },
+    overrides: [
+        utils.merge({ files: "*.mjs" }, configs["+modules"]),
+        {
+            files: "test/*.mjs",
+            rules: {
+                "new-cap": "off",
+            },
+        },
+    ],
+}

.travis.yml

@@ -1,10 +1,9 @@
-sudo: false
-
 language: node_js
 node_js:
-  - "4"
   - "6"
   - "8"
+  - "10"
+  - "11"
 
 script:
   - npm run -s test:mocha

dist/abort-controller.mjs

@@ -33,9 +33,13 @@ class AbortSignal extends EventTarget {
     get aborted() {
         const aborted = abortedFlags.get(this);
         if (typeof aborted !== "boolean") {
-            throw new TypeError(`Expected 'this' to be an 'AbortSignal' object, but got ${this === null ? "null" : typeof this}`)
+            throw new TypeError(
+                `Expected 'this' to be an 'AbortSignal' object, but got ${
+                    this === null ? "null" : typeof this
+                }`
+            )
         }
-        return Boolean(aborted)
+        return aborted
     }
 
     /**
@@ -54,8 +58,8 @@ Object.defineProperties(AbortSignal.prototype, {
     },
 });
 
-if (typeof Symbol === "function" && typeof Symbol.toStringTag === "symbol") { //eslint-disable-line node/no-unsupported-features
-    Object.defineProperty(AbortSignal.prototype, Symbol.toStringTag, { //eslint-disable-line node/no-unsupported-features
+if (typeof Symbol === "function" && typeof Symbol.toStringTag === "symbol") {
+    Object.defineProperty(AbortSignal.prototype, Symbol.toStringTag, {
         configurable: true,
         value: "AbortSignal",
     });
@@ -102,7 +106,11 @@ const signals = new WeakMap();
 function getSignal(controller) {
     const signal = signals.get(controller);
     if (signal == null) {
-        throw new TypeError(`Expected 'this' to be an 'AbortController' object, but got ${controller === null ? "null" : typeof controller}`)
+        throw new TypeError(
+            `Expected 'this' to be an 'AbortController' object, but got ${
+                controller === null ? "null" : typeof controller
+            }`
+        )
     }
     return signal
 }
@@ -146,8 +154,8 @@ Object.defineProperties(AbortController.prototype, {
     abort: { enumerable: true },
 });
 
-if (typeof Symbol === "function" && typeof Symbol.toStringTag === "symbol") { //eslint-disable-line node/no-unsupported-features
-    Object.defineProperty(AbortController.prototype, Symbol.toStringTag, { //eslint-disable-line node/no-unsupported-features
+if (typeof Symbol === "function" && typeof Symbol.toStringTag === "symbol") {
+    Object.defineProperty(AbortController.prototype, Symbol.toStringTag, {
         configurable: true,
         value: "AbortController",
     });