From 8544ffad99ea877d984d505e7bd7ff2f5d762895 Mon Sep 17 00:00:00 2001
From: Daniel Tschinder <daniel@tschinder.de>
Date: Fri, 16 Jun 2017 18:33:29 +0200
Subject: [PATCH] Only base cache identifier on babel options from pkg.json
 (#468)

---
 .eslintrc               |  1 +
 src/utils/exists.js     |  6 +-----
 src/utils/read.js       | 10 +++++++---
 test/utils/read.test.js |  6 ++++++
 4 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/.eslintrc b/.eslintrc
index e5cddf5d..8ed70799 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -7,6 +7,7 @@
   "plugins": ["prettier"],
   "rules": {
     "arrow-parens": "off",
+    "quotes": "off",
     "prettier/prettier": ["error", { "trailingComma": "all" }]
   }
 }
diff --git a/src/utils/exists.js b/src/utils/exists.js
index c3f79041..1b4372cd 100644
--- a/src/utils/exists.js
+++ b/src/utils/exists.js
@@ -1,13 +1,9 @@
 module.exports = function(fileSystem, filename) {
-  if (!filename) return false;
-
   let exists = false;
 
   try {
     exists = fileSystem.statSync(filename).isFile();
-  } catch (ignoreError) {
-    return false;
-  }
+  } catch (e) {}
 
   return exists;
 };
diff --git a/src/utils/read.js b/src/utils/read.js
index 643666e7..d2d403c0 100644
--- a/src/utils/read.js
+++ b/src/utils/read.js
@@ -1,6 +1,10 @@
-module.exports = function(fileSystem, filename) {
-  if (!filename) {
-    throw new Error("filename must be a string");
+const path = require("path");
+
+module.exports = function readBabelConfig(fileSystem, filename) {
+  if (path.basename(filename) === "package.json") {
+    const pkg = require(filename);
+
+    return JSON.stringify(pkg.babel);
   }
 
   // Webpack `fs` return Buffer
diff --git a/test/utils/read.test.js b/test/utils/read.test.js
index ed8da28c..35f721fc 100644
--- a/test/utils/read.test.js
+++ b/test/utils/read.test.js
@@ -5,6 +5,7 @@ import read from "../../lib/utils/read.js";
 
 const files = {
   existent: path.join(__dirname, "../fixtures/basic.js"),
+  pkg: path.join(__dirname, "../fixtures/package-test/package.json"),
 };
 
 const content = fs.readFileSync(files.existent, "utf8");
@@ -13,3 +14,8 @@ test("should return contents if file exists", t => {
   const realFile = read(fs, files.existent);
   t.is(realFile, content);
 });
+
+test("should only return config from package.json", t => {
+  const realFile = read(fs, files.pkg);
+  t.is(realFile, '{"stage":3}');
+});