From 99a54bafab5710b32fddb90136c7bbf4325ad1c4 Mon Sep 17 00:00:00 2001
From: Brian Ng <bng412@gmail.com>
Date: Thu, 18 Oct 2018 11:46:06 -0500
Subject: [PATCH] Allow `defaults` query in preset-env

---
 packages/babel-preset-env/src/targets-parser.js       | 8 ++++++++
 packages/babel-preset-env/test/targets-parser.spec.js | 9 +++++++++
 2 files changed, 17 insertions(+)

diff --git a/packages/babel-preset-env/src/targets-parser.js b/packages/babel-preset-env/src/targets-parser.js
index c2a446d7ea84..ad165a6d1a65 100644
--- a/packages/babel-preset-env/src/targets-parser.js
+++ b/packages/babel-preset-env/src/targets-parser.js
@@ -50,6 +50,13 @@ const validateBrowsers = browsers => {
     typeof browsers === "undefined" || isBrowsersQueryValid(browsers),
     `Invalid Option: '${browsers}' is not a valid browserslist query`,
   );
+
+  // Since we overwrite browserslist.defaults, let's special case
+  // when a user actually wants `defaults`.
+  if (browsers === "defaults") {
+    return browserslistDefaults;
+  }
+
   return browsers;
 };
 
@@ -176,6 +183,7 @@ const getTargets = (targets: Object = {}, options: Object = {}): Targets => {
 
   // Parse browsers target via browserslist
   const browsersquery = validateBrowsers(targets.browsers);
+
   const shouldParseBrowsers = !!targets.browsers;
   const shouldSearchForConfig =
     !options.ignoreBrowserslistConfig && !Object.keys(targets).length;
diff --git a/packages/babel-preset-env/test/targets-parser.spec.js b/packages/babel-preset-env/test/targets-parser.spec.js
index fe6e2fac314a..f87cc5cfd42f 100644
--- a/packages/babel-preset-env/test/targets-parser.spec.js
+++ b/packages/babel-preset-env/test/targets-parser.spec.js
@@ -20,6 +20,15 @@ describe("getTargets", () => {
     });
   });
 
+  it("allows 'defaults' query", () => {
+    const browserslistDefaults = browserslist.defaults;
+
+    const expected = getTargets({ browsers: browserslistDefaults });
+    const actual = getTargets({ browsers: "defaults" });
+
+    expect(actual).toEqual(expected);
+  });
+
   it("does not clobber browserslists defaults", () => {
     const browserslistDefaults = browserslist.defaults;