From 63bad42d7f10210a2498a1725356d4a28f1777e5 Mon Sep 17 00:00:00 2001
From: Jaideep Bhoosreddy <jbhoosreddy@bloomberg.net>
Date: Fri, 22 Nov 2019 02:46:16 -0500
Subject: [PATCH] Add local babel workflow (#25)

* Add local babel workflow

* update README
---
 README.md                              |  6 ++++++
 lib/run-tests/contextualize-require.js | 13 +++++++++++++
 lib/run-tests/get-babel-plugins.js     | 10 ++++++----
 lib/run-tests/transpile.js             |  5 +++--
 4 files changed, 28 insertions(+), 6 deletions(-)
 create mode 100644 lib/run-tests/contextualize-require.js

diff --git a/README.md b/README.md
index a0b1536..3eef0b5 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,12 @@ If you want to run **all** the tests, run
 node lib/run-tests I_AM_SURE
 ```
 
+If you want to run against a local copy of babel repo (useful for debugging):
+
+```
+BABEL_PATH=../babel node lib/run-tests [pattern]
+```
+
 ## Download babel/babel master test262 artifact
 
 ```
diff --git a/lib/run-tests/contextualize-require.js b/lib/run-tests/contextualize-require.js
new file mode 100644
index 0000000..7ecce87
--- /dev/null
+++ b/lib/run-tests/contextualize-require.js
@@ -0,0 +1,13 @@
+const path = require('path');
+
+const babelPath = process.env.BABEL_PATH ?
+    path.resolve(process.cwd(), process.env.BABEL_PATH) :
+    undefined;
+
+module.exports = function contextualizeRequire(path) {
+    if (!babelPath) {
+        return require(path);
+    }
+    const newPath = `${babelPath}/${path.replace('@babel/', 'packages/babel-')}`;
+    return require(newPath);
+};
diff --git a/lib/run-tests/get-babel-plugins.js b/lib/run-tests/get-babel-plugins.js
index ff360bc..e57d953 100644
--- a/lib/run-tests/get-babel-plugins.js
+++ b/lib/run-tests/get-babel-plugins.js
@@ -1,10 +1,12 @@
 "use strict";
 
+const requireBabel = require('./contextualize-require');
+
 const featuresToPlugins = {
-  "class-fields-public": require("@babel/plugin-proposal-class-properties"),
-  "class-methods-private": require("@babel/plugin-proposal-private-methods"),
-  "numeric-separator-literal": require("@babel/plugin-proposal-numeric-separator"),
-  //"import.meta": require("@babel/plugin-syntax-import-meta"),
+  "class-fields-public": requireBabel("@babel/plugin-proposal-class-properties"),
+  "class-methods-private": requireBabel("@babel/plugin-proposal-private-methods"),
+  "numeric-separator-literal": requireBabel("@babel/plugin-proposal-numeric-separator"),
+  //"import.meta": requireBabel("@babel/plugin-syntax-import-meta"),
 };
 
 const defaultPlugins = [
diff --git a/lib/run-tests/transpile.js b/lib/run-tests/transpile.js
index 113453b..95cb503 100644
--- a/lib/run-tests/transpile.js
+++ b/lib/run-tests/transpile.js
@@ -1,7 +1,8 @@
 "use strict";
 
-const { transformSync, loadOptions } = require("@babel/core");
-const presetEnv = require("@babel/preset-env");
+const requireBabel = require('./contextualize-require');
+const { transformSync, loadOptions } = requireBabel("@babel/core");
+const presetEnv = requireBabel("@babel/preset-env");
 
 const getBabelPlugins = require("./get-babel-plugins");