Extend the unicorn/logical-assignment-operators rule to if-statements

Please see https://github.com/sindresorhus/eslint-plugin-unicorn/blob/main/docs/rules/logical-assignment-operators.md and https://eslint.org/docs/latest/rules/logical-assignment-operators#enforceforifstatements

eslint.config.mjs

@@ -181,7 +181,7 @@ export default [
       "unicorn/logical-assignment-operators": [
         "error",
         "always",
-        { enforceForIfStatements: false },
+        { enforceForIfStatements: true },
       ],
       "unicorn/prefer-logical-operator-over-ternary": "error",
       "unicorn/prefer-modern-dom-apis": "error",

src/core/annotation.js

@@ -3318,13 +3318,11 @@ class ButtonWidgetAnnotation extends WidgetAnnotation {
       return super.getOperatorList(evaluator, task, intent, annotationStorage);
     }
 
-    if (value === null || value === undefined) {
-      // There is no default appearance so use the one derived
-      // from the field value.
-      value = this.data.checkBox
-        ? this.data.fieldValue === this.data.exportValue
-        : this.data.fieldValue === this.data.buttonValue;
-    }
+    // There is no default appearance, `value === null || value === undefined`,
+    // so use the one derived from the field value.
+    value ??= this.data.checkBox
+      ? this.data.fieldValue === this.data.exportValue
+      : this.data.fieldValue === this.data.buttonValue;
 
     return this.#getOperatorListForAppearance(
       evaluator,
@@ -4716,9 +4714,7 @@ class PolylineAnnotation extends MarkupAnnotation {
       const strokeAlpha = dict.get("CA");
 
       let fillColor = getRgbColor(dict.getArray("IC"), null);
-      if (fillColor) {
-        fillColor = getPdfColorArray(fillColor);
-      }
+      fillColor &&= getPdfColorArray(fillColor);
 
       let operator;
       if (fillColor) {

src/core/ccitt_stream.js

@@ -58,11 +58,9 @@ class CCITTFaxStream extends DecodeStream {
     if (this.eof) {
       return this.buffer;
     }
-    if (!bytes) {
-      bytes = this.stream.isAsync
-        ? (await this.stream.asyncGetBytes()) || this.bytes
-        : this.bytes;
-    }
+    bytes ??= this.stream.isAsync
+      ? (await this.stream.asyncGetBytes()) || this.bytes
+      : this.bytes;
 
     this.buffer = await JBig2CCITTFaxImage.instance.decode(
       bytes,

src/core/cff_parser.js

@@ -775,14 +775,12 @@ class CFFParser {
       } else if (localSubrIndex) {
         localSubrToUse = localSubrIndex;
       }
-      if (valid) {
-        valid = this.parseCharString(
-          state,
-          charstring,
-          localSubrToUse,
-          globalSubrIndex
-        );
-      }
+      valid &&= this.parseCharString(
+        state,
+        charstring,
+        localSubrToUse,
+        globalSubrIndex
+      );
       if (state.width !== null) {
         const nominalWidth = privateDictToUse.getByName("nominalWidthX");
         widths[i] = nominalWidth + state.width;

src/core/colorspace_utils.js

@@ -243,9 +243,7 @@ class ColorSpaceUtils {
           break;
         case "Pattern":
           baseCS = cs[1] || null;
-          if (baseCS) {
-            baseCS = this.#subParse(baseCS, options);
-          }
+          baseCS &&= this.#subParse(baseCS, options);
           return new PatternCS(baseCS);
         case "I":
         case "Indexed":

src/core/fonts_utils.js

@@ -151,9 +151,8 @@ function type1FontGlyphMapping(properties, builtInEncoding, glyphNames) {
       glyphId = glyphNames.indexOf(glyphName);
 
       if (glyphId === -1) {
-        if (!glyphsUnicodeMap) {
-          glyphsUnicodeMap = getGlyphsUnicode();
-        }
+        glyphsUnicodeMap ??= getGlyphsUnicode();
+
         const standardGlyphName = recoverGlyphName(glyphName, glyphsUnicodeMap);
         if (standardGlyphName !== glyphName) {
           glyphId = glyphNames.indexOf(standardGlyphName);

src/core/xfa/factory.js

@@ -160,11 +160,9 @@ class XFAFactory {
       const { html } = result;
       const { attributes } = html;
       if (attributes) {
-        if (attributes.class) {
-          attributes.class = attributes.class.filter(
-            attr => !attr.startsWith("xfa")
-          );
-        }
+        attributes.class &&= attributes.class.filter(
+          attr => !attr.startsWith("xfa")
+        );
         attributes.dir = "auto";
       }
 

src/core/xfa/fonts.js

@@ -31,9 +31,7 @@ class FontFinder {
       this.addPdfFont(pdfFont);
     }
     for (const pdfFont of this.fonts.values()) {
-      if (!pdfFont.regular) {
-        pdfFont.regular = pdfFont.italic || pdfFont.bold || pdfFont.bolditalic;
-      }
+      pdfFont.regular ||= pdfFont.italic || pdfFont.bold || pdfFont.bolditalic;
     }
 
     if (!reallyMissingFonts || reallyMissingFonts.size === 0) {
@@ -72,10 +70,7 @@ class FontFinder {
         property += "italic";
       }
     }
-
-    if (!property) {
-      property = "regular";
-    }
+    property ||= "regular";
 
     font[property] = pdfFont;
   }

src/core/xfa/xfa_object.js

@@ -518,9 +518,7 @@ class XFAObject {
         true /* = dotDotAllowed */,
         false /* = useCache */
       );
-      if (proto) {
-        proto = proto[0];
-      }
+      proto &&= proto[0];
     }
 
     if (!proto) {

src/core/xref.js

@@ -740,9 +740,7 @@ class XRef {
         if (isCmd(obj, "xref")) {
           // Parse end-of-file XRef
           dict = this.processXRefTable(parser);
-          if (!this.topDict) {
-            this.topDict = dict;
-          }
+          this.topDict ||= dict;
 
           // Recursively get other XRefs 'XRefStm', if any
           obj = dict.get("XRefStm");
@@ -762,9 +760,8 @@ class XRef {
             throw new FormatError("Invalid XRef stream");
           }
           dict = this.processXRefStream(obj);
-          if (!this.topDict) {
-            this.topDict = dict;
-          }
+          this.topDict ||= dict;
+
           if (!dict) {
             throw new FormatError("Failed to read XRef stream");
           }

src/display/annotation_layer.js

@@ -1187,10 +1187,8 @@ class LinkAnnotationElement extends AnnotationElement {
     if (data.overlaidText) {
       link.title = data.overlaidText;
     }
+    link.onclick ||= () => false;
 
-    if (!link.onclick) {
-      link.onclick = () => false;
-    }
     this.#setInternalLink();
   }
 

src/display/editor/stamp.js

@@ -488,12 +488,10 @@ class StampEditor extends AnnotationEditor {
   }
 
   copyCanvas(maxDataDimension, maxPreviewDimension, createImageData = false) {
-    if (!maxDataDimension) {
-      // TODO: get this value from Firefox
-      //   (https://bugzilla.mozilla.org/show_bug.cgi?id=1908184)
-      // It's the maximum dimension that the AI can handle.
-      maxDataDimension = 224;
-    }
+    // TODO: get this value from Firefox
+    //   (https://bugzilla.mozilla.org/show_bug.cgi?id=1908184)
+    // It's the maximum dimension that the AI can handle.
+    maxDataDimension ||= 224;
 
     const { width: bitmapWidth, height: bitmapHeight } = this.#bitmap;
     const outputScale = new OutputScale();

src/scripting_api/field.js

@@ -334,17 +334,11 @@ class Field extends PDFObject {
   }
 
   buttonGetCaption(nFace = 0) {
-    if (this._buttonCaption) {
-      return this._buttonCaption[nFace];
-    }
-    return "";
+    return this._buttonCaption ? this._buttonCaption[nFace] : "";
   }
 
   buttonGetIcon(nFace = 0) {
-    if (this._buttonIcon) {
-      return this._buttonIcon[nFace];
-    }
-    return null;
+    return this._buttonIcon ? this._buttonIcon[nFace] : null;
   }
 
   buttonImportIcon(cPath = null, nPave = 0) {
@@ -352,9 +346,7 @@ class Field extends PDFObject {
   }
 
   buttonSetCaption(cCaption, nFace = 0) {
-    if (!this._buttonCaption) {
-      this._buttonCaption = ["", "", ""];
-    }
+    this._buttonCaption ??= ["", "", ""];
     this._buttonCaption[nFace] = cCaption;
     // TODO: send to the annotation layer
     // Right now the button is drawn on the canvas using its appearance so
@@ -363,9 +355,7 @@ class Field extends PDFObject {
   }
 
   buttonSetIcon(oIcon, nFace = 0) {
-    if (!this._buttonIcon) {
-      this._buttonIcon = [null, null, null];
-    }
+    this._buttonIcon ??= [null, null, null];
     this._buttonIcon[nFace] = oIcon;
   }
 

src/scripting_api/util.js

@@ -119,9 +119,7 @@ class Util extends PDFObject {
         }
         cFlags = flags;
 
-        if (nWidth) {
-          nWidth = parseInt(nWidth);
-        }
+        nWidth &&= parseInt(nWidth);
 
         let intPart = Math.trunc(arg);
 
@@ -136,9 +134,7 @@ class Util extends PDFObject {
           return hex;
         }
 
-        if (nPrecision) {
-          nPrecision = parseInt(nPrecision.substring(1));
-        }
+        nPrecision &&= parseInt(nPrecision.substring(1));
 
         nDecSep = nDecSep ? nDecSep.substring(1) : "0";
         const separators = {

test/driver.js

@@ -968,9 +968,7 @@ class Driver {
     if (task.type === "other" || task.enableXfa) {
       return;
     }
-    if (!task._prefetchedLoadingTask) {
-      task._prefetchedLoadingTask = getDocument(this._getDocumentOptions(task));
-    }
+    task._prefetchedLoadingTask ??= getDocument(this._getDocumentOptions(task));
   }
 
   _cleanup() {

test/test.mjs

@@ -801,9 +801,8 @@ async function handleWsBinaryResult(data) {
   if (!taskResults) {
     return;
   }
-  if (!taskResults[round]) {
-    taskResults[round] = [];
-  }
+  taskResults[round] ||= [];
+
   if (taskResults[round][page - 1]) {
     console.error(
       `Results for ${browser}:${id}:${round}:${page - 1} were already submitted`
@@ -1010,9 +1009,7 @@ async function startBrowser({
     protocolTimeout: 0.75 * /* jasmine.DEFAULT_TIMEOUT_INTERVAL = */ 30000,
   };
 
-  if (!tempDir) {
-    tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "pdfjs-"));
-  }
+  tempDir ||= fs.mkdtempSync(path.join(os.tmpdir(), "pdfjs-"));
   const printFile = path.join(tempDir, "print.pdf");
 
   if (browserName === "chrome") {

web/app.js

@@ -2068,11 +2068,9 @@ const PDFViewerApplication = {
     );
     this.secondaryToolbar?.setPageNumber(this.pdfViewer.currentPageNumber);
 
-    if (!this.pdfViewer.currentScaleValue) {
-      // Scale was not initialized: invalid bookmark or scale was not specified.
-      // Setting the default one.
-      this.pdfViewer.currentScaleValue = DEFAULT_SCALE_VALUE;
-    }
+    // Scale was not initialized: invalid bookmark or scale was not specified.
+    // Setting the default one.
+    this.pdfViewer.currentScaleValue ||= DEFAULT_SCALE_VALUE;
   },
 
   /**

web/chromecom.js

@@ -272,11 +272,10 @@ let port;
 // 4. Page: Invoke callback.
 function setReferer(url, callback) {
   dnrRequestId ??= crypto.getRandomValues(new Uint32Array(1))[0] % 0x80000000;
-  if (!port) {
-    // The background page will accept the port, and keep adding the Referer
-    // request header to requests to |url| until the port is disconnected.
-    port = chrome.runtime.connect({ name: "chromecom-referrer" });
-  }
+  // The background page will accept the port, and keep adding the Referer
+  // request header to requests to |url| until the port is disconnected.
+  port ??= chrome.runtime.connect({ name: "chromecom-referrer" });
+
   port.onDisconnect.addListener(onDisconnect);
   port.onMessage.addListener(onMessage);
   // Initiate the information exchange.

web/pdf_thumbnail_viewer.js

@@ -1854,9 +1854,7 @@ class PDFThumbnailViewer {
           break;
         }
       }
-      if (!nextThumbnail) {
-        nextThumbnail = firstWithDifferentY;
-      }
+      nextThumbnail ??= firstWithDifferentY;
     }
     if (nextThumbnail) {
       this.#focusThumbnailElement(nextThumbnail, navigateCheckboxes);