Inline various goog.isDef() calls

src/ol/graticule.js

@@ -346,7 +346,7 @@ ol.Graticule.prototype.getMeridian_ = function(lon, minLat, maxLat,
       minLat, maxLat, this.projection_, squaredTolerance);
   goog.asserts.assert(flatCoordinates.length > 0,
       'flatCoordinates cannot be empty');
-  var lineString = goog.isDef(this.meridians_[index]) ?
+  var lineString = this.meridians_[index] !== undefined ?
       this.meridians_[index] : new ol.geom.LineString(null);
   lineString.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
   return lineString;
@@ -382,7 +382,7 @@ ol.Graticule.prototype.getParallel_ = function(lat, minLon, maxLon,
       this.minLon_, this.maxLon_, this.projection_, squaredTolerance);
   goog.asserts.assert(flatCoordinates.length > 0,
       'flatCoordinates cannot be empty');
-  var lineString = goog.isDef(this.parallels_[index]) ?
+  var lineString = this.parallels_[index] !== undefined ?
       this.parallels_[index] : new ol.geom.LineString(null);
   lineString.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
   return lineString;

src/ol/imagetile.js

@@ -126,7 +126,7 @@ ol.ImageTile.prototype.handleImageError_ = function() {
  */
 ol.ImageTile.prototype.handleImageLoad_ = function() {
   if (ol.LEGACY_IE_SUPPORT && ol.IS_LEGACY_IE) {
-    if (!goog.isDef(this.image_.naturalWidth)) {
+    if (this.image_.naturalWidth === undefined) {
       this.image_.naturalWidth = this.image_.width;
       this.image_.naturalHeight = this.image_.height;
     }

src/ol/proj/proj.js

@@ -146,7 +146,7 @@ ol.proj.Projection = function(options) {
   goog.asserts.assert(code !== undefined,
       'Option "code" is required for constructing instance');
   if (ol.ENABLE_PROJ4JS && typeof proj4 == 'function' &&
-      !goog.isDef(projections[code])) {
+      projections[code] === undefined) {
     var def = proj4.defs(code);
     if (def !== undefined) {
       if (def.axis !== undefined && options.axisOrientation === undefined) {

src/ol/render/canvas/canvasreplay.js

@@ -257,11 +257,12 @@ ol.render.canvas.Replay.prototype.replay_ = function(
       case ol.render.canvas.Instruction.BEGIN_GEOMETRY:
         feature = /** @type {ol.Feature} */ (instruction[1]);
         var featureUid = goog.getUid(feature).toString();
-        if (goog.isDef(skippedFeaturesHash[featureUid]) ||
+        if (skippedFeaturesHash[featureUid] !== undefined ||
             !goog.isDefAndNotNull(feature.getGeometry())) {
           i = /** @type {number} */ (instruction[2]);
         } else if (opt_hitExtent !== undefined && !ol.extent.intersects(
-            opt_hitExtent, feature.getGeometry().getExtent())) {
+            /** @type {Array<number>} */ (opt_hitExtent),
+            feature.getGeometry().getExtent())) {
           i = /** @type {number} */ (instruction[2]);
         } else {
           ++i;
@@ -451,7 +452,8 @@ ol.render.canvas.Replay.prototype.replay_ = function(
             '6th instruction should be a number');
         goog.asserts.assert(!goog.isNull(instruction[6]),
             '7th instruction should not be null');
-        var usePixelRatio = goog.isDef(instruction[7]) ? instruction[7] : true;
+        var usePixelRatio = instruction[7] !== undefined ?
+            instruction[7] : true;
         var lineWidth = /** @type {number} */ (instruction[2]);
         context.strokeStyle = /** @type {string} */ (instruction[1]);
         context.lineWidth = usePixelRatio ? lineWidth * pixelRatio : lineWidth;

src/ol/render/webgl/webglreplay.js

@@ -733,7 +733,7 @@ ol.render.webgl.ImageReplay.prototype.drawReplaySkipping_ =
       var feature = this.startIndicesFeature_[featureIndex];
 
       var featureUid = goog.getUid(feature).toString();
-      if (goog.isDef(skippedFeaturesHash[featureUid])) {
+      if (skippedFeaturesHash[featureUid] !== undefined) {
         // feature should be skipped
         if (start !== end) {
           // draw the features so far
@@ -865,10 +865,11 @@ ol.render.webgl.ImageReplay.prototype.drawHitDetectionReplayOneByOne_ =
       feature = this.startIndicesFeature_[featureIndex];
       featureUid = goog.getUid(feature).toString();
 
-      if (!goog.isDef(skippedFeaturesHash[featureUid]) &&
+      if (skippedFeaturesHash[featureUid] === undefined &&
           goog.isDefAndNotNull(feature.getGeometry()) &&
           (opt_hitExtent === undefined || ol.extent.intersects(
-              opt_hitExtent, feature.getGeometry().getExtent()))) {
+              /** @type {Array<number>} */ (opt_hitExtent),
+              feature.getGeometry().getExtent()))) {
         gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
         this.drawElements_(gl, start, end, elementType, elementSize);