From 8d9195f8627557f53a8be06324f553f50acd047b Mon Sep 17 00:00:00 2001
From: Izaak Schroeder <izaak.schroeder@gmail.com>
Date: Tue, 21 Feb 2017 19:13:03 -0800
Subject: [PATCH] Pass `dirname` as extra metadata to preset constructor.
 (#4834)
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* Pass `dirname` as extra metadata to preset constructor.

Sometimes a preset would like to know where it should resolve relative paths from (e.g. https://github.com/tleunen/babel-plugin-module-resolver) and this extra information makes that possible.

* Test for `dirname` passed into preset constructor

This adds a check for `dirname`’s existence and correctness to the
`resolve-addons-relative-to-file` test, and serves as a minimal example
of a path-aware preset.
---
 .../src/transformation/file/options/option-manager.js    | 2 +-
 .../node_modules/addons/preset.js                        | 9 +++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/packages/babel-core/src/transformation/file/options/option-manager.js b/packages/babel-core/src/transformation/file/options/option-manager.js
index f4b25206bc..4746260a36 100644
--- a/packages/babel-core/src/transformation/file/options/option-manager.js
+++ b/packages/babel-core/src/transformation/file/options/option-manager.js
@@ -299,7 +299,7 @@ export default class OptionManager {
             (presetLoc || "a preset") + " which does not accept options.");
         }
 
-        if (typeof val === "function") val = val(context, options);
+        if (typeof val === "function") val = val(context, options, { dirname });
 
         if (typeof val !== "object") {
           throw new Error(`Unsupported preset format: ${val}.`);
diff --git a/packages/babel-core/test/fixtures/resolution/resolve-addons-relative-to-file/node_modules/addons/preset.js b/packages/babel-core/test/fixtures/resolution/resolve-addons-relative-to-file/node_modules/addons/preset.js
index a1af16e41f..e08f4b1c61 100644
--- a/packages/babel-core/test/fixtures/resolution/resolve-addons-relative-to-file/node_modules/addons/preset.js
+++ b/packages/babel-core/test/fixtures/resolution/resolve-addons-relative-to-file/node_modules/addons/preset.js
@@ -1,5 +1,10 @@
-module.exports = {
-  plugins: [plugin],
+module.exports = function preset (context, options, fileContext) {
+  if (/resolve-addons-relative-to-file$/.test(fileContext.dirname)) {
+    return {
+      plugins: [plugin],
+    };
+  }
+  return {};
 };
 
 function plugin () {