Merge branch 'hot-module-reload' into release-2.0

# Conflicts:
#	packages/modules-runtime-hot/package.js
#	packages/react-fast-refresh/README.md

packages/modules-runtime-hot/package.js

@@ -1,7 +1,7 @@
 Package.describe({
   name: "modules-runtime-hot",
   version: "0.13.0-rc200.1",
-  summary: "Patches modules-runtime to support Hot Module Reload",
+  summary: "Patches modules-runtime to support Hot Module Replacement",
   git: "https://github.com/benjamn/install",
   documentation: "README.md"
 });

packages/react-fast-refresh/README.md

@@ -1,3 +1,15 @@
 # react-fast-refresh
+[Source code of released version](https://github.com/meteor/meteor/tree/master/packages/react-fast-refresh) | [Source code of development version](https://github.com/meteor/meteor/tree/devel/packages/react-fast-refresh)
+***
 
-Automatically update React components with HMR
+This package updates modified React components in the running app for faster
+feedback after changing a file. To be enabled, your app must:
+
+- Use the `hot-module-replacement` package
+- Use React 16.9.0 or newer
+
+This package is disabled in production. It currently only supports the modern web client.
+
+Learn more in the [React Fast Refresh docs](https://reactnative.dev/docs/fast-refresh)
+
+React Fast Refresh can be disabled by setting the `DISABLE_REACT_FAST_REFRESH` environment variable before starting Meteor.

packages/react-fast-refresh/client-runtime.js

@@ -1,4 +1,6 @@
-if (process.env.NODE_ENV !== 'production' && module.hot) {
+const enabled = __meteor_runtime_config__.reactFastRefreshEnabled;
+
+if (enabled && process.env.NODE_ENV !== 'production' && module.hot) {
   const runtime = require('react-refresh/runtime');
 
   let timeout = null;

packages/react-fast-refresh/package.js

@@ -7,7 +7,7 @@ Package.describe({
 });
 
 Npm.depends({
-  'react-refresh': '0.8.3',
+  'react-refresh': '0.9.0',
    semver: '7.3.4'
 });
 

packages/react-fast-refresh/server.js

@@ -15,6 +15,10 @@ if (enabled) {
   }
 }
 
+if (typeof __meteor_runtime_config__ === 'object') {
+  __meteor_runtime_config__.reactFastRefreshEnabled = enabled;
+}
+
 const babelPlugin = enabled ?
   require('react-refresh/babel') :
   null;

tools/runners/run-app.js

@@ -226,7 +226,9 @@ _.extend(AppProcess.prototype, {
 
     env.METEOR_PRINT_ON_LISTEN = 'true';
 
-    env.METEOR_HMR_SECRET = self.hmrSecret; 
+    if (self.hmrSecret) {
+      env.METEOR_HMR_SECRET = self.hmrSecret;
+    }
 
     return env;
   },