fs: load dates lazily

Author: anonrig

lib/internal/fs/utils.js

@@ -12,6 +12,7 @@ const {
   NumberIsFinite,
   MathMin,
   MathRound,
+  ObjectDefineProperty,
   ObjectIs,
   ObjectSetPrototypeOf,
   ReflectApply,
@@ -462,15 +463,51 @@ function BigIntStats(dev, mode, nlink, uid, gid, rdev, blksize,
   this.mtimeNs = mtimeNs;
   this.ctimeNs = ctimeNs;
   this.birthtimeNs = birthtimeNs;
-  this.atime = dateFromMs(this.atimeMs);
-  this.mtime = dateFromMs(this.mtimeMs);
-  this.ctime = dateFromMs(this.ctimeMs);
-  this.birthtime = dateFromMs(this.birthtimeMs);
 }
 
 ObjectSetPrototypeOf(BigIntStats.prototype, StatsBase.prototype);
 ObjectSetPrototypeOf(BigIntStats, StatsBase);
 
+ObjectDefineProperty(BigIntStats.prototype, 'atime', {
+  __proto__: null,
+  enumerable: true,
+  get: function() {
+    const value = dateFromMs(this.atimeMs);
+    ObjectDefineProperty(this, 'atime', { __proto__: null, value });
+    return this.atime;
+  },
+});
+
+ObjectDefineProperty(BigIntStats.prototype, 'mtime', {
+  __proto__: null,
+  enumerable: true,
+  get: function() {
+    const value = dateFromMs(this.mtimeMs);
+    ObjectDefineProperty(this, 'mtime', { __proto__: null, value });
+    return this.mtime;
+  },
+});
+
+ObjectDefineProperty(BigIntStats.prototype, 'ctime', {
+  __proto__: null,
+  enumerable: true,
+  get: function() {
+    const value = dateFromMs(this.ctimeMs);
+    ObjectDefineProperty(this, 'ctime', { __proto__: null, value });
+    return this.ctime;
+  },
+});
+
+ObjectDefineProperty(BigIntStats.prototype, 'birthtime', {
+  __proto__: null,
+  enumerable: true,
+  get: function() {
+    const value = dateFromMs(this.birthtimeMs);
+    ObjectDefineProperty(this, 'birthtime', { __proto__: null, value });
+    return this.birthtime;
+  },
+});
+
 BigIntStats.prototype._checkModeProperty = function(property) {
   if (isWindows && (property === S_IFIFO || property === S_IFBLK ||
     property === S_IFSOCK)) {
@@ -488,15 +525,51 @@ function Stats(dev, mode, nlink, uid, gid, rdev, blksize,
   this.mtimeMs = mtimeMs;
   this.ctimeMs = ctimeMs;
   this.birthtimeMs = birthtimeMs;
-  this.atime = dateFromMs(atimeMs);
-  this.mtime = dateFromMs(mtimeMs);
-  this.ctime = dateFromMs(ctimeMs);
-  this.birthtime = dateFromMs(birthtimeMs);
 }
 
 ObjectSetPrototypeOf(Stats.prototype, StatsBase.prototype);
 ObjectSetPrototypeOf(Stats, StatsBase);
 
+ObjectDefineProperty(Stats.prototype, 'atime', {
+  __proto__: null,
+  enumerable: true,
+  get: function() {
+    const value = dateFromMs(this.atimeMs);
+    ObjectDefineProperty(this, 'atime', { __proto__: null, value });
+    return this.atime;
+  },
+});
+
+ObjectDefineProperty(Stats.prototype, 'mtime', {
+  __proto__: null,
+  enumerable: true,
+  get: function() {
+    const value = dateFromMs(this.mtimeMs);
+    ObjectDefineProperty(this, 'mtime', { __proto__: null, value });
+    return this.mtime;
+  },
+});
+
+ObjectDefineProperty(Stats.prototype, 'ctime', {
+  __proto__: null,
+  enumerable: true,
+  get: function() {
+    const value = dateFromMs(this.ctimeMs);
+    ObjectDefineProperty(this, 'ctime', { __proto__: null, value });
+    return this.ctime;
+  },
+});
+
+ObjectDefineProperty(Stats.prototype, 'birthtime', {
+  __proto__: null,
+  enumerable: true,
+  get: function() {
+    const value = dateFromMs(this.birthtimeMs);
+    ObjectDefineProperty(this, 'birthtime', { __proto__: null, value });
+    return this.birthtime;
+  },
+});
+
 // HACK: Workaround for https://github.com/standard-things/esm/issues/821.
 // TODO(ronag): Remove this as soon as `esm` publishes a fixed version.
 Stats.prototype.isFile = StatsBase.prototype.isFile;