Update: update no-unsupported-features for Node 7.6 supports async/await (fixes #67)

Author: mysticatea

docs/rules/no-unsupported-features.md

@@ -126,6 +126,7 @@ The `version` option accepts the following version number:
 - `5`
 - `6`
 - `7`
+- `7.6` ... It supports async functions.
 
 ### ignores
 

lib/rules/no-unsupported-features.js

@@ -18,7 +18,7 @@ const getValueIfString = require("../util/get-value-if-string")
 // Helpers
 //------------------------------------------------------------------------------
 
-const VERSIONS = [0.10, 0.12, 4, 5, 6, 7]
+const VERSIONS = [0.10, 0.12, 4, 5, 6, 7, 7.6]
 const OPTIONS = Object.keys(features)
 const FUNC_TYPE = /^(?:Arrow)?Function(?:Declaration|Expression)$/
 const CLASS_TYPE = /^Class(?:Declaration|Expression)$/
@@ -69,11 +69,8 @@ function parseVersion(comparator) {
     const major = comparator.semver.major
     const minor = comparator.semver.minor
 
-    if (major >= 1) {
-        return major
-    }
-    if (minor >= 10) {
-        return parseFloat(`0.${minor}`)
+    if (major >= 1 || minor >= 10) {
+        return parseFloat(`${major}.${minor}`)
     }
     return 0.10
 }
@@ -174,7 +171,7 @@ function parseOptions(options, defaultVersion) {
     }
 
     return Object.freeze({
-        version: version < 1 ? version.toFixed(2) : version.toFixed(0),
+        version: version < 1 ? version.toFixed(2) : String(version),
         features: Object.freeze(OPTIONS.reduce(
             (retv, key) => {
                 const feature = features[key]

lib/util/features.js

@@ -139,7 +139,7 @@ module.exports = {
     "asyncAwait": {
         alias: ["syntax"],
         name: "Async Functions",
-        node: NaN,
+        node: 7.6,
     },
     "trailingCommasInFunctionSyntax": {
         alias: ["syntax"],

tests/fixtures/no-unsupported-features/gte-7.5.0/package.json

@@ -0,0 +1,7 @@
+{
+    "private": true,
+    "name": "test",
+    "engines": {
+        "node": ">=7.5.0"
+    }
+}

tests/fixtures/no-unsupported-features/gte-7.6.0/package.json

@@ -0,0 +1,7 @@
+{
+    "private": true,
+    "name": "test",
+    "engines": {
+        "node": ">=7.6.0"
+    }
+}

tests/lib/rules/no-unsupported-features.js

@@ -17,7 +17,7 @@ const RuleTester = require("eslint").RuleTester
 // Helpers
 //------------------------------------------------------------------------------
 
-const VERSIONS = Object.freeze([0.10, 0.12, 4, 5, 6, 7])
+const VERSIONS = Object.freeze([0.10, 0.12, 4, 5, 6, 7, 7.6])
 
 /**
  * Creates test pattern.
@@ -51,7 +51,7 @@ function convertPattern(retv, pattern) {
 
     // Creates each pattern of Node versions.
     VERSIONS.forEach(version => {
-        const versionText = version < 1 ? version.toFixed(2) : version.toFixed(0)
+        const versionText = version < 1 ? version.toFixed(2) : String(version)
 
         // Skips if ignored
         if (pattern.ignores && pattern.ignores.indexOf(version) !== -1) {
@@ -362,7 +362,7 @@ ruleTester.run("no-unsupported-features", rule, [
             "class A { async foo() { await obj; } };",
         ].join("\n"),
         errors: 10,
-        supported: NaN,
+        supported: 7.6,
         ignores: [0.10, 0.12, 4, 5],
     },
     {
@@ -1041,6 +1041,11 @@ ruleTester.run("no-unsupported-features", rule, [
             parserOptions: {ecmaVersion: 2017},
             options: [{ignores: ["asyncAwait"]}],
         },
+        {
+            filename: fixture("gte-7.6.0/a.js"),
+            code: "var a = async () => 1",
+            parserOptions: {ecmaVersion: 2017},
+        },
     ],
     invalid: [
         {
@@ -1067,5 +1072,11 @@ ruleTester.run("no-unsupported-features", rule, [
             env: {es6: true},
             errors: ["Arrow Functions are not supported yet on Node v0.10."],
         },
+        {
+            filename: fixture("gte-7.5.0/a.js"),
+            code: "var a = async () => 1",
+            parserOptions: {ecmaVersion: 2017},
+            errors: ["Async Functions are not supported yet on Node v7.5."],
+        },
     ],
 }))