From fb4422a7b0cdf71448accce468f7c304da44fe16 Mon Sep 17 00:00:00 2001
From: Abdullah <abdullahtariq52@gmail.com>
Date: Thu, 17 Jan 2019 01:00:39 +0500
Subject: [PATCH] added fix for typescript asset invalidation (#2485)

---
 packages/core/parcel-bundler/src/assets/JSAsset.js |  8 +-------
 .../parcel-bundler/src/assets/TypeScriptAsset.js   |  6 ++++++
 .../src/utils/isAccessedVarChanged.js              | 14 ++++++++++++++
 3 files changed, 21 insertions(+), 7 deletions(-)
 create mode 100644 packages/core/parcel-bundler/src/utils/isAccessedVarChanged.js

diff --git a/packages/core/parcel-bundler/src/assets/JSAsset.js b/packages/core/parcel-bundler/src/assets/JSAsset.js
index 413bd1ec019..cc2c0208442 100644
--- a/packages/core/parcel-bundler/src/assets/JSAsset.js
+++ b/packages/core/parcel-bundler/src/assets/JSAsset.js
@@ -37,13 +37,7 @@ class JSAsset extends Asset {
   }
 
   shouldInvalidate(cacheData) {
-    for (let key in cacheData.env) {
-      if (cacheData.env[key] !== process.env[key]) {
-        return true;
-      }
-    }
-
-    return false;
+    return isAccessedVarChanged(cacheData);
   }
 
   mightHaveDependencies() {
diff --git a/packages/core/parcel-bundler/src/assets/TypeScriptAsset.js b/packages/core/parcel-bundler/src/assets/TypeScriptAsset.js
index 7e6795e9914..db301c92e15 100644
--- a/packages/core/parcel-bundler/src/assets/TypeScriptAsset.js
+++ b/packages/core/parcel-bundler/src/assets/TypeScriptAsset.js
@@ -1,10 +1,16 @@
 const Asset = require('../Asset');
 const localRequire = require('../utils/localRequire');
+const isAccessedVarChanged = require('../utils/isAccessedVarChanged');
 
 class TypeScriptAsset extends Asset {
   constructor(name, options) {
     super(name, options);
     this.type = 'js';
+    this.cacheData.env = {};
+  }
+
+  shouldInvalidate(cacheData) {
+    return isAccessedVarChanged(cacheData);
   }
 
   async generate() {
diff --git a/packages/core/parcel-bundler/src/utils/isAccessedVarChanged.js b/packages/core/parcel-bundler/src/utils/isAccessedVarChanged.js
new file mode 100644
index 00000000000..9cd4284b0da
--- /dev/null
+++ b/packages/core/parcel-bundler/src/utils/isAccessedVarChanged.js
@@ -0,0 +1,14 @@
+/*
+  Checks if any of the used variable from process.env is changed
+*/
+function isAccessedVarChanged(cacheData) {
+  for (let key in cacheData.env) {
+    if (cacheData.env[key] !== process.env[key]) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+module.exports = isAccessedVarChanged;