Merge pull request #15752 from Snuffleupagus/no-typeof-undefined

Enable the `no-typeof-undefined` ESLint plugin rule

src/display/canvas.js

@@ -1870,8 +1870,7 @@ class CanvasGraphics {
     this.ctx.closePath();
   }
 
-  stroke(consumePath) {
-    consumePath = typeof consumePath !== "undefined" ? consumePath : true;
+  stroke(consumePath = true) {
     const ctx = this.ctx;
     const strokeColor = this.current.strokeColor;
     // For stroke we want to temporarily change the global alpha to the
@@ -1904,8 +1903,7 @@ class CanvasGraphics {
     this.stroke();
   }
 
-  fill(consumePath) {
-    consumePath = typeof consumePath !== "undefined" ? consumePath : true;
+  fill(consumePath = true) {
     const ctx = this.ctx;
     const fillColor = this.current.fillColor;
     const isPatternFill = this.current.patternFill;

src/display/fetch_stream.js

@@ -46,7 +46,7 @@ function createHeaders(httpHeaders) {
   const headers = new Headers();
   for (const property in httpHeaders) {
     const value = httpHeaders[property];
-    if (typeof value === "undefined") {
+    if (value === undefined) {
       continue;
     }
     headers.append(property, value);

src/display/network.js

@@ -82,7 +82,7 @@ class NetworkManager {
     xhr.withCredentials = this.withCredentials;
     for (const property in this.httpHeaders) {
       const value = this.httpHeaders[property];
-      if (typeof value === "undefined") {
+      if (value === undefined) {
         continue;
       }
       xhr.setRequestHeader(property, value);

src/display/node_stream.js

@@ -373,7 +373,7 @@ class PDFNodeStreamRangeReader extends BaseRangeReader {
     this._httpHeaders = {};
     for (const property in stream.httpHeaders) {
       const value = stream.httpHeaders[property];
-      if (typeof value === "undefined") {
+      if (value === undefined) {
         continue;
       }
       this._httpHeaders[property] = value;