Optimize library_nodepath.js. NFC (#23086)

Author: sbc100

src/closure-externs/node-externs.js

@@ -119,3 +119,15 @@ fs.Stats.prototype.mtimeMs;
  * @type {number}
  */
 fs.Stats.prototype.ctimeMs;
+
+/**
+ * @param {string} p
+ * @return {boolean}
+ * @nosideeffects
+ */
+path.isAbsolute;
+
+/**
+ * @type {Object.<string,*>}
+ */
+path.posix;

src/library_nodepath.js

@@ -12,23 +12,23 @@
 // operations. Hence, using `nodePath` should be safe here.
 
 addToLibrary({
-  $PATH: {
-    isAbs: (path) => nodePath['isAbsolute'](path),
-    normalize: (path) => nodePath['normalize'](path),
-    dirname: (path) => nodePath['dirname'](path),
-    basename: (path) => nodePath['basename'](path),
-    join: (...args) => nodePath['join'](...args),
-    join2: (l, r) => nodePath['join'](l, r),
-  },
+  $PATH: `{
+    isAbs: nodePath.isAbsolute,
+    normalize: nodePath.normalize,
+    dirname: nodePath.dirname,
+    basename: nodePath.basename,
+    join: nodePath.join,
+    join2: nodePath.join,
+  }`,
   // The FS-using parts are split out into a separate object, so simple path
   // usage does not require the FS.
   $PATH_FS__deps: ['$FS'],
   $PATH_FS__docs: '/** @type{{resolve: function(...*)}} */',
   $PATH_FS: {
     resolve: (...paths) => {
       paths.unshift(FS.cwd());
-      return nodePath['posix']['resolve'](...paths);
+      return nodePath.posix.resolve(...paths);
     },
-    relative: (from, to) => nodePath['posix']['relative'](from || FS.cwd(), to || FS.cwd()),
+    relative: (from, to) => nodePath.posix.relative(from || FS.cwd(), to || FS.cwd()),
   }
 });

src/library_noderawfs.js

@@ -40,7 +40,7 @@ addToLibrary({
     },
     lookupPath(path, opts = {}) {
       if (opts.parent) {
-        path = nodePath.dirname(path);
+        path = PATH.dirname(path);
       }
       var st = fs.lstatSync(path);
       var mode = NODEFS.getMode(path);