From 7c457e5d5d7f805f1d60088b22c901a1e3c9310d Mon Sep 17 00:00:00 2001
From: Simon Fridlund <simon@fridlund.email>
Date: Wed, 13 Dec 2017 00:20:00 +0100
Subject: [PATCH] feat: Add support for arrowParens

---
 package.json           |  2 +-
 src/__tests__/utils.js | 15 ++++++++++++++-
 src/utils.js           | 17 +++++++++++++++++
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/package.json b/package.json
index 182c1023..aa9bc654 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "indent-string": "^3.2.0",
     "lodash.merge": "^4.6.0",
     "loglevel-colored-level-prefix": "^1.0.0",
-    "prettier": "^1.7.1",
+    "prettier": "^1.9.0",
     "pretty-format": "^21.2.1",
     "require-relative": "^0.8.7",
     "typescript": "^2.5.1",
diff --git a/src/__tests__/utils.js b/src/__tests__/utils.js
index 4ed1123a..2f21c0a8 100644
--- a/src/__tests__/utils.js
+++ b/src/__tests__/utils.js
@@ -134,6 +134,18 @@ const getPrettierOptionsFromESLintRulesTests = [
     },
     options: { jsxBracketSameLine: true }
   },
+  {
+    rules: {
+      "arrow-parens": [2, "always"]
+    },
+    options: { arrowParens: "always" }
+  },
+  {
+    rules: {
+      "arrow-parens": [2, "as-needed"]
+    },
+    options: { arrowParens: "avoid" }
+  },
 
   // If an ESLint rule is disabled fall back to prettier defaults.
   { rules: { "max-len": [0, { code: 120 }] }, options: {} },
@@ -152,7 +164,8 @@ const getPrettierOptionsFromESLintRulesTests = [
   { rules: { indent: ["warn", 4] }, options: { tabWidth: 4 } },
   { rules: { indent: ["error", "tab"] }, options: { useTabs: true } },
   { rules: { indent: [2, "tab"] }, options: { useTabs: true } },
-  { rules: { "react/jsx-closing-bracket-location": [0] }, options: {} }
+  { rules: { "react/jsx-closing-bracket-location": [0] }, options: {} },
+  { rules: { "arrow-parens": [0] }, options: {} }
 ];
 
 getPrettierOptionsFromESLintRulesTests.forEach(
diff --git a/src/utils.js b/src/utils.js
index 6e9e7e16..d0db63b0 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -48,6 +48,10 @@ const OPTION_GETTERS = {
     ruleValue: rules =>
       getRuleValue(rules, "react/jsx-closing-bracket-location", "nonEmpty"),
     ruleValueToPrettierOption: getJsxBracketSameLine
+  },
+  arrowParens: {
+    ruleValue: rules => getRuleValue(rules, "arrow-parens"),
+    ruleValueToPrettierOption: getArrowParens
   }
 };
 
@@ -285,9 +289,22 @@ function getJsxBracketSameLine(eslintValue, fallbacks) {
   } else {
     prettierValue = eslintValue;
   }
+
   return makePrettierOption("jsxBracketSameLine", prettierValue, fallbacks);
 }
 
+function getArrowParens(eslintValue, fallbacks) {
+  let prettierValue;
+
+  if (eslintValue === "as-needed") {
+    prettierValue = "avoid";
+  } else {
+    prettierValue = eslintValue;
+  }
+
+  return makePrettierOption("arrowParens", prettierValue, fallbacks);
+}
+
 function extractRuleValue(objPath, name, value) {
   if (objPath) {
     logger.trace(