Patch for parcel-bundler which fixes several outstanding issues

parcel-bundler+1.12.4.patch

diff --git a/node_modules/parcel-bundler/src/Resolver.js b/node_modules/parcel-bundler/src/Resolver.js
index 825e45d..471cd26 100755
--- a/node_modules/parcel-bundler/src/Resolver.js
+++ b/node_modules/parcel-bundler/src/Resolver.js
@@ -175,6 +175,10 @@ class Resolver {
     let parts = getModuleParts(filename);
     let root = path.parse(dir).root;
 
+    if (parts[0] === 'core-js') {
+      dir = path.resolve(require.main.children[0].path, '../..');
+    }
+
     while (dir !== root) {
       // Skip node_modules directories
       if (path.basename(dir) === 'node_modules') {
diff --git a/node_modules/parcel-bundler/src/transforms/babel/env.js b/node_modules/parcel-bundler/src/transforms/babel/env.js
index 5dee001..c30b10c 100644
--- a/node_modules/parcel-bundler/src/transforms/babel/env.js
+++ b/node_modules/parcel-bundler/src/transforms/babel/env.js
@@ -51,12 +51,12 @@ async function getEnvPlugins(targets, useBuiltIns = false) {
   const options = {
     targets,
     modules: false,
-    useBuiltIns: useBuiltIns ? 'entry' : false,
+    useBuiltIns: useBuiltIns ? 'usage' : false,
     shippedProposals: true
   };
 
   if (useBuiltIns) {
-    options.corejs = 2;
+    options.corejs = '3.6';
   }
 
   let plugins = presetEnv.default({assertVersion: () => true}, options).plugins;
diff --git a/node_modules/parcel-bundler/src/utils/getTargetEngines.js b/node_modules/parcel-bundler/src/utils/getTargetEngines.js
index 0571b28..c1febb3 100644
--- a/node_modules/parcel-bundler/src/utils/getTargetEngines.js
+++ b/node_modules/parcel-bundler/src/utils/getTargetEngines.js
@@ -25,7 +25,7 @@ async function getTargetEngines(asset, isTargetApp) {
   let engines = pkg && pkg.engines;
   let nodeVersion = engines && getMinSemver(engines.node);
 
-  if (compileTarget === 'node') {
+  if (compileTarget === 'node' && nodeVersion !== undefined) {
     // Use package.engines.node by default if we are compiling for node.
     if (typeof nodeVersion === 'string') {
       targets.node = nodeVersion;
@@ -39,9 +39,13 @@ async function getTargetEngines(asset, isTargetApp) {
     } else if (pkg && pkg.browserslist) {
       targets.browsers = pkg.browserslist;
     } else {
-      let browserslist = await loadBrowserslist(asset, path);
-      if (browserslist) {
-        targets.browsers = browserslist;
+      let browserslistrc = await loadBrowserslist(asset, path);
+      if (browserslistrc) {
+        if (compileTarget === 'node') {
+          targets.node = browserslist(browserslistrc.defaults)[0].split(/\s/)[1];
+        } else {
+          targets.browsers = browserslistrc;
+        }
       } else {
         let babelTargets = await loadBabelrc(asset, path);
         if (babelTargets && babelTargets.browsers) {

Patch for parcel-bundler which fixes several outstanding issues

$ git apply -p2 --directory="node_modules" --unsafe-paths "parcel-bundler+1.12.4.patch"