lib: move internalBinding whitelisting into loaders.js

Instead of setting the internalBinding white list in node.js and
wrapping process.binding twice, put it directly in loaders.js
where the user land process.binding is defined.

PR-URL: #24088
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: joyeecheung

lib/internal/bootstrap/loaders.js

@@ -70,12 +70,52 @@
     writable: false
   });
 
+  // internalBindingWhitelist contains the name of internalBinding modules
+  // that are whitelisted for access via process.binding()... this is used
+  // to provide a transition path for modules that are being moved over to
+  // internalBinding.
+  const internalBindingWhitelist = [
+    'cares_wrap',
+    'fs_event_wrap',
+    'icu',
+    'udp_wrap',
+    'uv',
+    'pipe_wrap',
+    'http_parser',
+    'process_wrap',
+    'v8',
+    'tty_wrap',
+    'stream_wrap',
+    'signal_wrap',
+    'crypto',
+    'contextify',
+    'tcp_wrap',
+    'tls_wrap',
+    'util',
+    'async_wrap',
+    'url',
+    'spawn_sync',
+    'js_stream',
+    'zlib',
+    'buffer',
+    'natives',
+    'constants'
+  ];
+  // We will use a lazy loaded SafeSet in internalBindingWhitelistHas
+  // for checking existence in this list.
+  let internalBindingWhitelistSet;
+
   // Set up process.binding() and process._linkedBinding()
   {
     const bindingObj = ObjectCreate(null);
 
     process.binding = function binding(module) {
       module = String(module);
+      // Deprecated specific process.binding() modules, but not all, allow
+      // selective fallback to internalBinding for the deprecated ones.
+      if (internalBindingWhitelistHas(module)) {
+        return internalBinding(module);
+      }
       let mod = bindingObj[module];
       if (typeof mod !== 'object') {
         mod = bindingObj[module] = getBinding(module);
@@ -376,6 +416,14 @@
     NativeModule.require('internal/process/coverage').setup();
   }
 
+  function internalBindingWhitelistHas(name) {
+    if (!internalBindingWhitelistSet) {
+      const { SafeSet } = NativeModule.require('internal/safe_globals');
+      internalBindingWhitelistSet = new SafeSet(internalBindingWhitelist);
+    }
+    return internalBindingWhitelistSet.has(name);
+  }
+
   // This will be passed to the bootstrapNodeJSCore function in
   // bootstrap/node.js.
   return loaderExports;

lib/internal/bootstrap/node.js

@@ -384,47 +384,6 @@
       for (var i = 0; i < arguments.length; i++)
         this.push(arguments[i]);
     }
-
-    // Deprecated specific process.binding() modules, but not all, allow
-    // selective fallback to internalBinding for the deprecated ones.
-    const { SafeSet } = NativeModule.require('internal/safe_globals');
-    const processBinding = process.binding;
-    // internalBindingWhitelist contains the name of internalBinding modules
-    // that are whitelisted for access via process.binding()... this is used
-    // to provide a transition path for modules that are being moved over to
-    // internalBinding.
-    const internalBindingWhitelist =
-      new SafeSet([
-        'cares_wrap',
-        'fs_event_wrap',
-        'icu',
-        'udp_wrap',
-        'uv',
-        'pipe_wrap',
-        'http_parser',
-        'process_wrap',
-        'v8',
-        'tty_wrap',
-        'stream_wrap',
-        'signal_wrap',
-        'crypto',
-        'contextify',
-        'tcp_wrap',
-        'tls_wrap',
-        'util',
-        'async_wrap',
-        'url',
-        'spawn_sync',
-        'js_stream',
-        'zlib',
-        'buffer',
-        'natives',
-        'constants']);
-    process.binding = function binding(name) {
-      return internalBindingWhitelist.has(name) ?
-        internalBinding(name) :
-        processBinding(name);
-    };
   }
 
   function setupGlobalVariables() {