diff --git a/.eslintrc b/.eslintrc
index c38de3598..03dc596df 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -187,6 +187,10 @@
         "selector": "CallExpression[callee.name='isDict'][arguments.length<2]",
         "message": "Use `instanceof Dict` rather than `isDict()` with one argument.",
       },
+      {
+        "selector": "CallExpression[callee.name='isName'][arguments.length<2]",
+        "message": "Use `instanceof Name` rather than `isName()` with one argument.",
+      },
       {
         "selector": "NewExpression[callee.name='Cmd']",
         "message": "Use `Cmd.get()` rather than `new Cmd()`.",
diff --git a/src/core/annotation.js b/src/core/annotation.js
index 4ee78145f..34bbe9257 100644
--- a/src/core/annotation.js
+++ b/src/core/annotation.js
@@ -104,7 +104,7 @@ class AnnotationFactory {
 
     // Determine the annotation's subtype.
     let subtype = dict.get("Subtype");
-    subtype = isName(subtype) ? subtype.name : null;
+    subtype = subtype instanceof Name ? subtype.name : null;
 
     // Return the right annotation object based on the subtype and field type.
     const parameters = {
@@ -128,7 +128,7 @@ class AnnotationFactory {
 
       case "Widget":
         let fieldType = getInheritableProperty({ dict, key: "FT" });
-        fieldType = isName(fieldType) ? fieldType.name : null;
+        fieldType = fieldType instanceof Name ? fieldType.name : null;
 
         switch (fieldType) {
           case "Tx":
@@ -698,7 +698,7 @@ class Annotation {
     // In case the normal appearance is a dictionary, the `AS` entry provides
     // the key of the stream in this dictionary.
     const as = dict.get("AS");
-    if (!isName(as) || !normalAppearanceState.has(as.name)) {
+    if (!(as instanceof Name) || !normalAppearanceState.has(as.name)) {
       return;
     }
     this.appearance = normalAppearanceState.get(as.name);
@@ -912,7 +912,7 @@ class AnnotationBorderStyle {
 
     // Some corrupt PDF generators may provide the width as a `Name`,
     // rather than as a number (fixes issue 10385).
-    if (isName(width)) {
+    if (width instanceof Name) {
       this.width = 0; // This is consistent with the behaviour in Adobe Reader.
       return;
     }
@@ -946,7 +946,7 @@ class AnnotationBorderStyle {
    * @see {@link shared/util.js}
    */
   setStyle(style) {
-    if (!isName(style)) {
+    if (!(style instanceof Name)) {
       return;
     }
     switch (style.name) {
@@ -1055,7 +1055,8 @@ class MarkupAnnotation extends Annotation {
       this.data.inReplyTo = rawIRT instanceof Ref ? rawIRT.toString() : null;
 
       const rt = dict.get("RT");
-      this.data.replyType = isName(rt) ? rt.name : AnnotationReplyType.REPLY;
+      this.data.replyType =
+        rt instanceof Name ? rt.name : AnnotationReplyType.REPLY;
     }
 
     if (this.data.replyType === AnnotationReplyType.GROUP) {
@@ -1265,7 +1266,7 @@ class WidgetAnnotation extends Annotation {
     );
 
     const fieldType = getInheritableProperty({ dict, key: "FT" });
-    data.fieldType = isName(fieldType) ? fieldType.name : null;
+    data.fieldType = fieldType instanceof Name ? fieldType.name : null;
 
     const localResources = getInheritableProperty({ dict, key: "DR" });
     const acroFormResources = params.acroForm.get("DR");
@@ -1306,7 +1307,7 @@ class WidgetAnnotation extends Annotation {
       return formValue
         .filter(item => isString(item))
         .map(item => stringToPDFString(item));
-    } else if (isName(formValue)) {
+    } else if (formValue instanceof Name) {
       return stringToPDFString(formValue.name);
     } else if (isString(formValue)) {
       return stringToPDFString(formValue);
@@ -2321,7 +2322,7 @@ class ButtonWidgetAnnotation extends WidgetAnnotation {
     if (fieldParent instanceof Dict) {
       this.parent = params.dict.getRaw("Parent");
       const fieldParentValue = fieldParent.get("V");
-      if (isName(fieldParentValue)) {
+      if (fieldParentValue instanceof Name) {
         this.data.fieldValue = this._decodeFormValue(fieldParentValue);
       }
     }
@@ -2566,7 +2567,8 @@ class PopupAnnotation extends Annotation {
     }
 
     const parentSubtype = parentItem.get("Subtype");
-    this.data.parentType = isName(parentSubtype) ? parentSubtype.name : null;
+    this.data.parentType =
+      parentSubtype instanceof Name ? parentSubtype.name : null;
     const rawParent = parameters.dict.getRaw("Parent");
     this.data.parentId = rawParent instanceof Ref ? rawParent.toString() : null;
 
diff --git a/src/core/catalog.js b/src/core/catalog.js
index 9ed56f017..edaec0547 100644
--- a/src/core/catalog.js
+++ b/src/core/catalog.js
@@ -529,9 +529,10 @@ class Catalog {
       creator: isString(config.get("Creator"))
         ? stringToPDFString(config.get("Creator"))
         : null,
-      baseState: isName(config.get("BaseState"))
-        ? config.get("BaseState").name
-        : null,
+      baseState:
+        config.get("BaseState") instanceof Name
+          ? config.get("BaseState").name
+          : null,
       on: parseOnOff(config.get("ON")),
       off: parseOnOff(config.get("OFF")),
       order: parseOrder(config.get("Order")),
@@ -667,7 +668,7 @@ class Catalog {
 
         if (labelDict.has("S")) {
           const s = labelDict.get("S");
-          if (!isName(s)) {
+          if (!(s instanceof Name)) {
             throw new FormatError("Invalid style in PageLabel dictionary.");
           }
           style = s.name;
@@ -743,7 +744,7 @@ class Catalog {
     // affect the Scroll mode (continuous/non-continuous) used in Adobe Reader.
     let pageLayout = "";
 
-    if (isName(obj)) {
+    if (obj instanceof Name) {
       switch (obj.name) {
         case "SinglePage":
         case "OneColumn":
@@ -761,7 +762,7 @@ class Catalog {
     const obj = this._catDict.get("PageMode");
     let pageMode = "UseNone"; // Default value.
 
-    if (isName(obj)) {
+    if (obj instanceof Name) {
       switch (obj.name) {
         case "UseNone":
         case "UseOutlines":
@@ -1465,7 +1466,7 @@ class Catalog {
 
     if (action instanceof Dict) {
       const actionType = action.get("S");
-      if (!isName(actionType)) {
+      if (!(actionType instanceof Name)) {
         warn("parseDestDictionary: Invalid type in Action dictionary.");
         return;
       }
@@ -1519,7 +1520,7 @@ class Catalog {
           // NOTE: the destination is relative to the *remote* document.
           let remoteDest = action.get("D");
           if (remoteDest) {
-            if (isName(remoteDest)) {
+            if (remoteDest instanceof Name) {
               remoteDest = remoteDest.name;
             }
             if (isString(url)) {
@@ -1540,7 +1541,7 @@ class Catalog {
 
         case "Named":
           const namedAction = action.get("N");
-          if (isName(namedAction)) {
+          if (namedAction instanceof Name) {
             resultObj.action = namedAction.name;
           }
           break;
@@ -1587,7 +1588,7 @@ class Catalog {
       resultObj.unsafeUrl = url;
     }
     if (dest) {
-      if (isName(dest)) {
+      if (dest instanceof Name) {
         dest = dest.name;
       }
       if (isString(dest) || Array.isArray(dest)) {
diff --git a/src/core/cmap.js b/src/core/cmap.js
index ab2228a9e..2316608ca 100644
--- a/src/core/cmap.js
+++ b/src/core/cmap.js
@@ -20,7 +20,7 @@ import {
   unreachable,
   warn,
 } from "../shared/util.js";
-import { Cmd, EOF, isCmd, isName } from "./primitives.js";
+import { Cmd, EOF, isCmd, Name } from "./primitives.js";
 import { BaseStream } from "./base_stream.js";
 import { Lexer } from "./parser.js";
 import { MissingDataException } from "./core_utils.js";
@@ -901,7 +901,7 @@ const CMapFactory = (function CMapFactoryClosure() {
 
   function parseCMapName(cMap, lexer) {
     const obj = lexer.getObj();
-    if (isName(obj) && isString(obj.name)) {
+    if (obj instanceof Name && isString(obj.name)) {
       cMap.name = obj.name;
     }
   }
@@ -913,7 +913,7 @@ const CMapFactory = (function CMapFactoryClosure() {
         const obj = lexer.getObj();
         if (obj === EOF) {
           break;
-        } else if (isName(obj)) {
+        } else if (obj instanceof Name) {
           if (obj.name === "WMode") {
             parseWMode(cMap, lexer);
           } else if (obj.name === "CMapName") {
@@ -925,7 +925,7 @@ const CMapFactory = (function CMapFactoryClosure() {
             case "endcmap":
               break objLoop;
             case "usecmap":
-              if (isName(previous)) {
+              if (previous instanceof Name) {
                 embeddedUseCMap = previous.name;
               }
               break;
@@ -1024,7 +1024,7 @@ const CMapFactory = (function CMapFactoryClosure() {
       const fetchBuiltInCMap = params.fetchBuiltInCMap;
       const useCMap = params.useCMap;
 
-      if (isName(encoding)) {
+      if (encoding instanceof Name) {
         return createBuiltInCMap(encoding.name, fetchBuiltInCMap);
       } else if (encoding instanceof BaseStream) {
         const parsedCMap = await parseCMap(
diff --git a/src/core/colorspace.js b/src/core/colorspace.js
index 1a5d2826a..145498461 100644
--- a/src/core/colorspace.js
+++ b/src/core/colorspace.js
@@ -21,7 +21,7 @@ import {
   unreachable,
   warn,
 } from "../shared/util.js";
-import { Dict, isName, Name, Ref } from "./primitives.js";
+import { Dict, Name, Ref } from "./primitives.js";
 import { BaseStream } from "./base_stream.js";
 import { MissingDataException } from "./core_utils.js";
 
@@ -378,7 +378,7 @@ class ColorSpace {
    */
   static _parse(cs, xref, resources = null, pdfFunctionFactory) {
     cs = xref.fetchIfRef(cs);
-    if (isName(cs)) {
+    if (cs instanceof Name) {
       switch (cs.name) {
         case "G":
         case "DeviceGray":
@@ -397,7 +397,7 @@ class ColorSpace {
             if (colorSpaces instanceof Dict) {
               const resourcesCS = colorSpaces.get(cs.name);
               if (resourcesCS) {
-                if (isName(resourcesCS)) {
+                if (resourcesCS instanceof Name) {
                   return this._parse(
                     resourcesCS,
                     xref,
diff --git a/src/core/crypto.js b/src/core/crypto.js
index f41831824..4aeddae95 100644
--- a/src/core/crypto.js
+++ b/src/core/crypto.js
@@ -1647,7 +1647,7 @@ const CipherTransformFactory = (function CipherTransformFactoryClosure() {
   }
 
   function buildCipherConstructor(cf, name, num, gen, key) {
-    if (!isName(name)) {
+    if (!(name instanceof Name)) {
       throw new FormatError("Invalid crypt filter name.");
     }
     const cryptFilter = cf.get(name.name);
@@ -1713,7 +1713,7 @@ const CipherTransformFactory = (function CipherTransformFactoryClosure() {
           // Trying to find default handler -- it usually has Length.
           const cfDict = dict.get("CF");
           const streamCryptoName = dict.get("StmF");
-          if (cfDict instanceof Dict && isName(streamCryptoName)) {
+          if (cfDict instanceof Dict && streamCryptoName instanceof Name) {
             cfDict.suppressEncryption = true; // See comment below.
             const handlerDict = cfDict.get(streamCryptoName.name);
             keyLength = (handlerDict && handlerDict.get("Length")) || 128;
diff --git a/src/core/document.js b/src/core/document.js
index cf30f5555..bcef7d875 100644
--- a/src/core/document.js
+++ b/src/core/document.js
@@ -1196,7 +1196,7 @@ class PDFDocument {
           let customValue;
           if (isString(value)) {
             customValue = stringToPDFString(value);
-          } else if (isName(value) || isNum(value) || isBool(value)) {
+          } else if (value instanceof Name || isNum(value) || isBool(value)) {
             customValue = value;
           } else {
             info(`Unsupported value in document info for (custom) "${key}".`);
diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index 7f5e7b911..6b8b907b5 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -124,7 +124,7 @@ function normalizeBlendMode(value, parsingArray = false) {
     return "source-over";
   }
 
-  if (!isName(value)) {
+  if (!(value instanceof Name)) {
     if (parsingArray) {
       return null;
     }
@@ -1450,7 +1450,7 @@ class PartialEvaluator {
     }
     const length = array.length;
     const operator = this.xref.fetchIfRef(array[0]);
-    if (length < 2 || !isName(operator)) {
+    if (length < 2 || !(operator instanceof Name)) {
       warn("Invalid visibility expression");
       return;
     }
@@ -1481,7 +1481,7 @@ class PartialEvaluator {
 
   async parseMarkedContentProps(contentProperties, resources) {
     let optionalContent;
-    if (isName(contentProperties)) {
+    if (contentProperties instanceof Name) {
       const properties = resources.get("Properties");
       optionalContent = properties.get(contentProperties.name);
     } else if (contentProperties instanceof Dict) {
@@ -1527,9 +1527,10 @@ class PartialEvaluator {
         return {
           type: optionalContentType,
           ids: groupIds,
-          policy: isName(optionalContent.get("P"))
-            ? optionalContent.get("P").name
-            : null,
+          policy:
+            optionalContent.get("P") instanceof Name
+              ? optionalContent.get("P").name
+              : null,
           expression: null,
         };
       } else if (optionalContentGroups instanceof Ref) {
@@ -1658,7 +1659,7 @@ class PartialEvaluator {
                 }
 
                 const type = xobj.dict.get("Subtype");
-                if (!isName(type)) {
+                if (!(type instanceof Name)) {
                   throw new FormatError("XObject should have a Name subtype");
                 }
 
@@ -2058,7 +2059,7 @@ class PartialEvaluator {
             // but doing so is meaningless without knowing the semantics.
             continue;
           case OPS.beginMarkedContentProps:
-            if (!isName(args[0])) {
+            if (!(args[0] instanceof Name)) {
               warn(`Expected name for beginMarkedContentProps arg0=${args[0]}`);
               continue;
             }
@@ -2980,7 +2981,7 @@ class PartialEvaluator {
                 }
 
                 const type = xobj.dict.get("Subtype");
-                if (!isName(type)) {
+                if (!(type instanceof Name)) {
                   throw new FormatError("XObject should have a Name subtype");
                 }
 
@@ -3116,7 +3117,7 @@ class PartialEvaluator {
             if (includeMarkedContent) {
               textContent.items.push({
                 type: "beginMarkedContent",
-                tag: isName(args[0]) ? args[0].name : null,
+                tag: args[0] instanceof Name ? args[0].name : null,
               });
             }
             break;
@@ -3132,7 +3133,7 @@ class PartialEvaluator {
                 id: Number.isInteger(mcid)
                   ? `${self.idFactory.getPageObjId()}_mcid${mcid}`
                   : null,
-                tag: isName(args[0]) ? args[0].name : null,
+                tag: args[0] instanceof Name ? args[0].name : null,
               });
             }
             break;
@@ -3215,9 +3216,8 @@ class PartialEvaluator {
       encoding = dict.get("Encoding");
       if (encoding instanceof Dict) {
         baseEncodingName = encoding.get("BaseEncoding");
-        baseEncodingName = isName(baseEncodingName)
-          ? baseEncodingName.name
-          : null;
+        baseEncodingName =
+          baseEncodingName instanceof Name ? baseEncodingName.name : null;
         // Load the differences between the base and original
         if (encoding.has("Differences")) {
           const diffEncoding = encoding.get("Differences");
@@ -3226,7 +3226,7 @@ class PartialEvaluator {
             const data = xref.fetchIfRef(diffEncoding[j]);
             if (isNum(data)) {
               index = data;
-            } else if (isName(data)) {
+            } else if (data instanceof Name) {
               differences[index++] = data.name;
             } else {
               throw new FormatError(
@@ -3235,7 +3235,7 @@ class PartialEvaluator {
             }
           }
         }
-      } else if (isName(encoding)) {
+      } else if (encoding instanceof Name) {
         baseEncodingName = encoding.name;
       } else {
         throw new FormatError("Encoding is not a Name nor a Dict");
@@ -3487,7 +3487,7 @@ class PartialEvaluator {
     if (!cmapObj) {
       return Promise.resolve(null);
     }
-    if (isName(cmapObj)) {
+    if (cmapObj instanceof Name) {
       return CMapFactory.create({
         encoding: cmapObj,
         fetchBuiltInCMap: this._fetchBuiltInCMapBound,
@@ -3639,7 +3639,7 @@ class PartialEvaluator {
       } else {
         // Trying get the BaseFont metrics (see comment above).
         const baseFontName = dict.get("BaseFont");
-        if (isName(baseFontName)) {
+        if (baseFontName instanceof Name) {
           const metrics = this.getBaseFontMetrics(baseFontName.name);
 
           glyphsWidths = this.buildCharCodeToWidth(metrics.widths, properties);
@@ -3737,7 +3737,7 @@ class PartialEvaluator {
   preEvaluateFont(dict) {
     const baseDict = dict;
     let type = dict.get("Subtype");
-    if (!isName(type)) {
+    if (!(type instanceof Name)) {
       throw new FormatError("invalid font Subtype");
     }
 
@@ -3758,7 +3758,7 @@ class PartialEvaluator {
         throw new FormatError("Descendant font is not a dictionary.");
       }
       type = dict.get("Subtype");
-      if (!isName(type)) {
+      if (!(type instanceof Name)) {
         throw new FormatError("invalid font Subtype");
       }
       composite = true;
@@ -3771,13 +3771,13 @@ class PartialEvaluator {
       hash = new MurmurHash3_64();
 
       const encoding = baseDict.getRaw("Encoding");
-      if (isName(encoding)) {
+      if (encoding instanceof Name) {
         hash.update(encoding.name);
       } else if (encoding instanceof Ref) {
         hash.update(encoding.toString());
       } else if (encoding instanceof Dict) {
         for (const entry of encoding.getRawValues()) {
-          if (isName(entry)) {
+          if (entry instanceof Name) {
             hash.update(entry.name);
           } else if (entry instanceof Ref) {
             hash.update(entry.toString());
@@ -3788,7 +3788,7 @@ class PartialEvaluator {
 
             for (let j = 0; j < diffLength; j++) {
               const diffEntry = entry[j];
-              if (isName(diffEntry)) {
+              if (diffEntry instanceof Name) {
                 diffBuf[j] = diffEntry.name;
               } else if (isNum(diffEntry) || diffEntry instanceof Ref) {
                 diffBuf[j] = diffEntry.toString();
@@ -3812,7 +3812,7 @@ class PartialEvaluator {
               stream.end - stream.start
             );
         hash.update(uint8array);
-      } else if (isName(toUnicode)) {
+      } else if (toUnicode instanceof Name) {
         hash.update(toUnicode.name);
       }
 
@@ -3900,7 +3900,7 @@ class PartialEvaluator {
         // FontDescriptor was not required.
         // This case is here for compatibility.
         let baseFontName = dict.get("BaseFont");
-        if (!isName(baseFontName)) {
+        if (!(baseFontName instanceof Name)) {
           throw new FormatError("Base font is not specified");
         }
 
@@ -3996,7 +3996,7 @@ class PartialEvaluator {
     }
     fontName = fontName || baseFont;
 
-    if (!isName(fontName)) {
+    if (!(fontName instanceof Name)) {
       throw new FormatError("invalid font name");
     }
 
@@ -4080,7 +4080,7 @@ class PartialEvaluator {
 
     if (composite) {
       const cidEncoding = baseDict.get("Encoding");
-      if (isName(cidEncoding)) {
+      if (cidEncoding instanceof Name) {
         properties.cidEncoding = cidEncoding.name;
       }
       const cMap = await CMapFactory.create({
diff --git a/src/core/image.js b/src/core/image.js
index 850967185..322903b58 100644
--- a/src/core/image.js
+++ b/src/core/image.js
@@ -14,12 +14,12 @@
  */
 
 import { assert, FormatError, ImageKind, info, warn } from "../shared/util.js";
-import { isName, Name } from "./primitives.js";
 import { BaseStream } from "./base_stream.js";
 import { ColorSpace } from "./colorspace.js";
 import { DecodeStream } from "./decode_stream.js";
 import { JpegStream } from "./jpeg_stream.js";
 import { JpxImage } from "./jpx.js";
+import { Name } from "./primitives.js";
 
 /**
  * Decode and clamp a value. The formula is different from the spec because we
@@ -95,7 +95,7 @@ class PDFImage {
     const dict = image.dict;
 
     const filter = dict.get("F", "Filter");
-    if (isName(filter)) {
+    if (filter instanceof Name) {
       switch (filter.name) {
         case "JPXDecode":
           const jpxImage = new JpxImage();
diff --git a/src/core/parser.js b/src/core/parser.js
index 3b608f373..e3267783d 100644
--- a/src/core/parser.js
+++ b/src/core/parser.js
@@ -22,7 +22,7 @@ import {
   StreamType,
   warn,
 } from "../shared/util.js";
-import { Cmd, Dict, EOF, isCmd, isName, Name, Ref } from "./primitives.js";
+import { Cmd, Dict, EOF, isCmd, Name, Ref } from "./primitives.js";
 import {
   isWhiteSpace,
   MissingDataException,
@@ -128,7 +128,7 @@ class Parser {
         case "<<": // dictionary or stream
           const dict = new Dict(this.xref);
           while (!isCmd(this.buf1, ">>") && this.buf1 !== EOF) {
-            if (!isName(this.buf1)) {
+            if (!(this.buf1 instanceof Name)) {
               info("Malformed dictionary: key must be a name object");
               this.shift();
               continue;
@@ -489,7 +489,7 @@ class Parser {
     const dict = new Dict(this.xref);
     let dictLength;
     while (!isCmd(this.buf1, "ID") && this.buf1 !== EOF) {
-      if (!isName(this.buf1)) {
+      if (!(this.buf1 instanceof Name)) {
         throw new FormatError("Dictionary key must be a name object");
       }
       const key = this.buf1.name;
@@ -506,11 +506,11 @@ class Parser {
     // Extract the name of the first (i.e. the current) image filter.
     const filter = dict.get("F", "Filter");
     let filterName;
-    if (isName(filter)) {
+    if (filter instanceof Name) {
       filterName = filter.name;
     } else if (Array.isArray(filter)) {
       const filterZero = this.xref.fetchIfRef(filter[0]);
-      if (isName(filterZero)) {
+      if (filterZero instanceof Name) {
         filterName = filterZero.name;
       }
     }
@@ -695,7 +695,7 @@ class Parser {
     let filter = dict.get("F", "Filter");
     let params = dict.get("DP", "DecodeParms");
 
-    if (isName(filter)) {
+    if (filter instanceof Name) {
       if (Array.isArray(params)) {
         warn("/DecodeParms should not be an Array, when /Filter is a Name.");
       }
@@ -708,7 +708,7 @@ class Parser {
       const paramsArray = params;
       for (let i = 0, ii = filterArray.length; i < ii; ++i) {
         filter = this.xref.fetchIfRef(filterArray[i]);
-        if (!isName(filter)) {
+        if (!(filter instanceof Name)) {
           throw new FormatError(`Bad filter name "${filter}"`);
         }
 
diff --git a/src/core/struct_tree.js b/src/core/struct_tree.js
index 42fd5b5b1..740ab4499 100644
--- a/src/core/struct_tree.js
+++ b/src/core/struct_tree.js
@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-import { Dict, isName, Ref } from "./primitives.js";
+import { Dict, isName, Name, Ref } from "./primitives.js";
 import { isString, stringToPDFString, warn } from "../shared/util.js";
 import { NumberTree } from "./name_number_tree.js";
 
@@ -42,7 +42,7 @@ class StructTreeRoot {
       return;
     }
     roleMapDict.forEach((key, value) => {
-      if (!isName(value)) {
+      if (!(value instanceof Name)) {
         return;
       }
       this.roleMap.set(key, value.name);
@@ -64,7 +64,7 @@ class StructElementNode {
 
   get role() {
     const nameObj = this.dict.get("S");
-    const name = isName(nameObj) ? nameObj.name : "";
+    const name = nameObj instanceof Name ? nameObj.name : "";
     const { root } = this.tree;
     if (root.roleMap.has(name)) {
       return root.roleMap.get(name);
@@ -123,7 +123,8 @@ class StructElementNode {
       pageObjId = pageRef.toString();
     }
 
-    const type = isName(kidDict.get("Type")) ? kidDict.get("Type").name : null;
+    const type =
+      kidDict.get("Type") instanceof Name ? kidDict.get("Type").name : null;
     if (type === "MCR") {
       if (this.tree.pageDict.objId !== pageObjId) {
         return null;
diff --git a/src/core/writer.js b/src/core/writer.js
index 6a66bb8fb..5d525c961 100644
--- a/src/core/writer.js
+++ b/src/core/writer.js
@@ -14,7 +14,7 @@
  */
 
 import { bytesToString, escapeString, warn } from "../shared/util.js";
-import { Dict, isName, Name, Ref } from "./primitives.js";
+import { Dict, Name, Ref } from "./primitives.js";
 import { escapePDFName, parseXFAPath } from "./core_utils.js";
 import { SimpleDOMNode, SimpleXMLParser } from "./xml_parser.js";
 import { BaseStream } from "./base_stream.js";
@@ -71,7 +71,7 @@ function numberToString(value) {
 }
 
 function writeValue(value, buffer, transform) {
-  if (isName(value)) {
+  if (value instanceof Name) {
     buffer.push(`/${escapePDFName(value.name)}`);
   } else if (value instanceof Ref) {
     buffer.push(`${value.num} ${value.gen} R`);
diff --git a/test/unit/primitives_spec.js b/test/unit/primitives_spec.js
index 07b973597..e2fb10edb 100644
--- a/test/unit/primitives_spec.js
+++ b/test/unit/primitives_spec.js
@@ -470,6 +470,8 @@ describe("primitives", function () {
   });
 
   describe("isName", function () {
+    /* eslint-disable no-restricted-syntax */
+
     it("handles non-names", function () {
       const nonName = {};
       expect(isName(nonName)).toEqual(false);
@@ -493,6 +495,8 @@ describe("primitives", function () {
       expect(isName(emptyName, "")).toEqual(true);
       expect(isName(emptyName, "string")).toEqual(false);
     });
+
+    /* eslint-enable no-restricted-syntax */
   });
 
   describe("isCmd", function () {