Enable the ESLint no-shadow rule

.eslintrc

@@ -119,8 +119,8 @@
     "no-catch-shadow": "error",
     "no-delete-var": "error",
     "no-label-var": "error",
+    "no-shadow": "error",
     "no-shadow-restricted-names": "error",
-    "no-shadow": "off",
     "no-undef-init": "error",
     "no-undef": ["error", { "typeof": true, }],
     "no-unused-vars": ["error", {

external/builder/preprocessor2.js

@@ -289,7 +289,7 @@ function traverseTree(ctx, node) {
   for (var i in node) {
     var child = node[i];
     if (typeof child === "object" && child !== null && child.type) {
-      var result = traverseTree(ctx, child);
+      const result = traverseTree(ctx, child);
       if (result !== child) {
         node[i] = result;
       }
@@ -300,7 +300,7 @@ function traverseTree(ctx, node) {
           childItem !== null &&
           childItem.type
         ) {
-          var result = traverseTree(ctx, childItem);
+          const result = traverseTree(ctx, childItem);
           if (result !== childItem) {
             child[index] = result;
           }

gulpfile.js

@@ -167,8 +167,6 @@ function createStringSource(filename, content) {
 }
 
 function createWebpackConfig(defines, output) {
-  var path = require("path");
-
   var versionInfo = getVersionJSON();
   var bundleDefines = builder.merge(defines, {
     BUNDLE_VERSION: versionInfo.version,
@@ -243,9 +241,9 @@ function createWebpackConfig(defines, output) {
   };
 }
 
-function webpack2Stream(config) {
+function webpack2Stream(webpackConfig) {
   // Replacing webpack1 to webpack2 in the webpack-stream.
-  return webpackStream(config, webpack2);
+  return webpackStream(webpackConfig, webpack2);
 }
 
 function getVersionJSON() {
@@ -378,38 +376,38 @@ function createImageDecodersBundle(defines) {
     .pipe(replaceJSRootName(imageDecodersAMDName, "pdfjsImageDecoders"));
 }
 
-function checkFile(path) {
+function checkFile(filePath) {
   try {
-    var stat = fs.lstatSync(path);
+    var stat = fs.lstatSync(filePath);
     return stat.isFile();
   } catch (e) {
     return false;
   }
 }
 
-function checkDir(path) {
+function checkDir(dirPath) {
   try {
-    var stat = fs.lstatSync(path);
+    var stat = fs.lstatSync(dirPath);
     return stat.isDirectory();
   } catch (e) {
     return false;
   }
 }
 
-function replaceInFile(path, find, replacement) {
-  var content = fs.readFileSync(path).toString();
+function replaceInFile(filePath, find, replacement) {
+  var content = fs.readFileSync(filePath).toString();
   content = content.replace(find, replacement);
-  fs.writeFileSync(path, content);
+  fs.writeFileSync(filePath, content);
 }
 
 function getTempFile(prefix, suffix) {
   mkdirp.sync(BUILD_DIR + "tmp/");
   var bytes = require("crypto")
     .randomBytes(6)
     .toString("hex");
-  var path = BUILD_DIR + "tmp/" + prefix + bytes + suffix;
-  fs.writeFileSync(path, "");
-  return path;
+  var filePath = BUILD_DIR + "tmp/" + prefix + bytes + suffix;
+  fs.writeFileSync(filePath, "");
+  return filePath;
 }
 
 function createTestSource(testsName, bot) {
@@ -527,10 +525,10 @@ gulp.task("buildnumber", function(done) {
 
     var version = config.versionPrefix + buildNumber;
 
-    exec('git log --format="%h" -n 1', function(err, stdout, stderr) {
+    exec('git log --format="%h" -n 1', function(err2, stdout2, stderr2) {
       var buildCommit = "";
-      if (!err) {
-        buildCommit = stdout.replace("\n", "");
+      if (!err2) {
+        buildCommit = stdout2.replace("\n", "");
       }
 
       createStringSource(
@@ -559,9 +557,9 @@ gulp.task("default_preferences-pre", function() {
   function babelPluginReplaceNonWebPackRequire(babel) {
     return {
       visitor: {
-        Identifier(path, state) {
-          if (path.node.name === "__non_webpack_require__") {
-            path.replaceWith(babel.types.identifier("require"));
+        Identifier(curPath, state) {
+          if (curPath.node.name === "__non_webpack_require__") {
+            curPath.replaceWith(babel.types.identifier("require"));
           }
         },
       },
@@ -643,8 +641,8 @@ gulp.task("locale", function() {
   var locales = [];
   for (var i = 0; i < subfolders.length; i++) {
     var locale = subfolders[i];
-    var path = L10N_DIR + locale;
-    if (!checkDir(path)) {
+    var dirPath = L10N_DIR + locale;
+    if (!checkDir(dirPath)) {
       continue;
     }
     if (!/^[a-z][a-z]([a-z])?(-[A-Z][A-Z])?$/.test(locale)) {
@@ -656,7 +654,7 @@ gulp.task("locale", function() {
 
     locales.push(locale);
 
-    if (checkFile(path + "/viewer.properties")) {
+    if (checkFile(dirPath + "/viewer.properties")) {
       viewerOutput +=
         "[" +
         locale +
@@ -1163,9 +1161,9 @@ gulp.task(
     function babelPluginReplaceNonWebPackRequire(babel) {
       return {
         visitor: {
-          Identifier(path, state) {
-            if (path.node.name === "__non_webpack_require__") {
-              path.replaceWith(babel.types.identifier("require"));
+          Identifier(curPath, state) {
+            if (curPath.node.name === "__non_webpack_require__") {
+              curPath.replaceWith(babel.types.identifier("require"));
             }
           },
         },
@@ -1358,9 +1356,9 @@ gulp.task("baseline", function(done) {
     }
 
     exec("git checkout " + baselineCommit, { cwd: workingDirectory }, function(
-      error
+      error2
     ) {
-      if (error) {
+      if (error2) {
         done(new Error("Baseline commit checkout failed."));
         return;
       }

src/core/ccitt.js

@@ -465,6 +465,7 @@ const CCITTFaxDecoder = (function CCITTFaxDecoder() {
    * @param {CCITTFaxDecoderSource} source - The data which should be decoded.
    * @param {Object} [options] - Decoding options.
    */
+  // eslint-disable-next-line no-shadow
   function CCITTFaxDecoder(source, options = {}) {
     if (!source || typeof source.next !== "function") {
       throw new Error('CCITTFaxDecoder - invalid "source" parameter.');

src/core/ccitt_stream.js

@@ -18,6 +18,7 @@ import { CCITTFaxDecoder } from "./ccitt.js";
 import { DecodeStream } from "./stream.js";
 
 var CCITTFaxStream = (function CCITTFaxStreamClosure() {
+  // eslint-disable-next-line no-shadow
   function CCITTFaxStream(str, maybeLength, params) {
     this.str = str;
     this.dict = str.dict;

src/core/cff_parser.js

@@ -217,6 +217,7 @@ var CFFParser = (function CFFParserClosure() {
     { id: "flex1", min: 11, resetStack: true },
   ];
 
+  // eslint-disable-next-line no-shadow
   function CFFParser(file, properties, seacAnalysisEnabled) {
     this.bytes = file.getBytes();
     this.properties = properties;
@@ -964,6 +965,7 @@ var CFFParser = (function CFFParserClosure() {
 
 // Compact Font Format
 var CFF = (function CFFClosure() {
+  // eslint-disable-next-line no-shadow
   function CFF() {
     this.header = null;
     this.names = [];
@@ -1009,6 +1011,7 @@ var CFF = (function CFFClosure() {
 })();
 
 var CFFHeader = (function CFFHeaderClosure() {
+  // eslint-disable-next-line no-shadow
   function CFFHeader(major, minor, hdrSize, offSize) {
     this.major = major;
     this.minor = minor;
@@ -1019,6 +1022,7 @@ var CFFHeader = (function CFFHeaderClosure() {
 })();
 
 var CFFStrings = (function CFFStringsClosure() {
+  // eslint-disable-next-line no-shadow
   function CFFStrings() {
     this.strings = [];
   }
@@ -1054,6 +1058,7 @@ var CFFStrings = (function CFFStringsClosure() {
 })();
 
 var CFFIndex = (function CFFIndexClosure() {
+  // eslint-disable-next-line no-shadow
   function CFFIndex() {
     this.objects = [];
     this.length = 0;
@@ -1078,6 +1083,7 @@ var CFFIndex = (function CFFIndexClosure() {
 })();
 
 var CFFDict = (function CFFDictClosure() {
+  // eslint-disable-next-line no-shadow
   function CFFDict(tables, strings) {
     this.keyToNameMap = tables.keyToNameMap;
     this.nameToKeyMap = tables.nameToKeyMap;
@@ -1205,6 +1211,8 @@ var CFFTopDict = (function CFFTopDictClosure() {
     [[12, 38], "FontName", "sid", null],
   ];
   var tables = null;
+
+  // eslint-disable-next-line no-shadow
   function CFFTopDict(strings) {
     if (tables === null) {
       tables = CFFDict.createTables(layout);
@@ -1238,6 +1246,8 @@ var CFFPrivateDict = (function CFFPrivateDictClosure() {
     [19, "Subrs", "offset", null],
   ];
   var tables = null;
+
+  // eslint-disable-next-line no-shadow
   function CFFPrivateDict(strings) {
     if (tables === null) {
       tables = CFFDict.createTables(layout);
@@ -1255,6 +1265,7 @@ var CFFCharsetPredefinedTypes = {
   EXPERT_SUBSET: 2,
 };
 var CFFCharset = (function CFFCharsetClosure() {
+  // eslint-disable-next-line no-shadow
   function CFFCharset(predefined, format, charset, raw) {
     this.predefined = predefined;
     this.format = format;
@@ -1265,6 +1276,7 @@ var CFFCharset = (function CFFCharsetClosure() {
 })();
 
 var CFFEncoding = (function CFFEncodingClosure() {
+  // eslint-disable-next-line no-shadow
   function CFFEncoding(predefined, format, encoding, raw) {
     this.predefined = predefined;
     this.format = format;
@@ -1275,6 +1287,7 @@ var CFFEncoding = (function CFFEncodingClosure() {
 })();
 
 var CFFFDSelect = (function CFFFDSelectClosure() {
+  // eslint-disable-next-line no-shadow
   function CFFFDSelect(format, fdSelect) {
     this.format = format;
     this.fdSelect = fdSelect;
@@ -1293,6 +1306,7 @@ var CFFFDSelect = (function CFFFDSelectClosure() {
 // Helper class to keep track of where an offset is within the data and helps
 // filling in that offset once it's known.
 var CFFOffsetTracker = (function CFFOffsetTrackerClosure() {
+  // eslint-disable-next-line no-shadow
   function CFFOffsetTracker() {
     this.offsets = Object.create(null);
   }
@@ -1352,6 +1366,7 @@ var CFFOffsetTracker = (function CFFOffsetTrackerClosure() {
 
 // Takes a CFF and converts it to the binary representation.
 var CFFCompiler = (function CFFCompilerClosure() {
+  // eslint-disable-next-line no-shadow
   function CFFCompiler(cff) {
     this.cff = cff;
   }

src/core/cmap.js

@@ -713,6 +713,7 @@ var BinaryCMapReader = (function BinaryCMapReaderClosure() {
     });
   }
 
+  // eslint-disable-next-line no-shadow
   function BinaryCMapReader() {}
 
   BinaryCMapReader.prototype = {

src/core/colorspace.js

@@ -836,6 +836,7 @@ const DeviceCmykCS = (function DeviceCmykCSClosure() {
       k * (-22.33816807309886 * k - 180.12613974708367);
   }
 
+  // eslint-disable-next-line no-shadow
   class DeviceCmykCS extends ColorSpace {
     constructor() {
       super("DeviceCMYK", 4);
@@ -902,6 +903,7 @@ const CalGrayCS = (function CalGrayCSClosure() {
     dest[destOffset + 2] = val;
   }
 
+  // eslint-disable-next-line no-shadow
   class CalGrayCS extends ColorSpace {
     constructor(whitePoint, blackPoint, gamma) {
       super("CalGray", 1);
@@ -1190,6 +1192,7 @@ const CalRGBCS = (function CalRGBCSClosure() {
     dest[destOffset + 2] = sRGBTransferFunction(SRGB[2]) * 255;
   }
 
+  // eslint-disable-next-line no-shadow
   class CalRGBCS extends ColorSpace {
     constructor(whitePoint, blackPoint, gamma, matrix) {
       super("CalRGB", 3);
@@ -1371,6 +1374,7 @@ const LabCS = (function LabCSClosure() {
     dest[destOffset + 2] = Math.sqrt(b) * 255;
   }
 
+  // eslint-disable-next-line no-shadow
   class LabCS extends ColorSpace {
     constructor(whitePoint, blackPoint, range) {
       super("Lab", 3);

src/core/crypto.js

@@ -27,6 +27,7 @@ import { isDict, isName, Name } from "./primitives.js";
 import { DecryptStream } from "./stream.js";
 
 var ARCFourCipher = (function ARCFourCipherClosure() {
+  // eslint-disable-next-line no-shadow
   function ARCFourCipher(key) {
     this.a = 0;
     this.b = 0;
@@ -177,6 +178,7 @@ var calculateMD5 = (function calculateMD5Closure() {
   return hash;
 })();
 var Word64 = (function Word64Closure() {
+  // eslint-disable-next-line no-shadow
   function Word64(highInteger, lowInteger) {
     this.high = highInteger | 0;
     this.low = lowInteger | 0;
@@ -690,6 +692,7 @@ var calculateSHA384 = (function calculateSHA384Closure() {
   return hash;
 })();
 var NullCipher = (function NullCipherClosure() {
+  // eslint-disable-next-line no-shadow
   function NullCipher() {}
 
   NullCipher.prototype = {
@@ -1265,6 +1268,7 @@ var PDF17 = (function PDF17Closure() {
     return true;
   }
 
+  // eslint-disable-next-line no-shadow
   function PDF17() {}
 
   PDF17.prototype = {
@@ -1372,6 +1376,7 @@ var PDF20 = (function PDF20Closure() {
     return k.subarray(0, 32);
   }
 
+  // eslint-disable-next-line no-shadow
   function PDF20() {}
 
   function compareByteArrays(array1, array2) {
@@ -1446,6 +1451,7 @@ var PDF20 = (function PDF20Closure() {
 })();
 
 var CipherTransform = (function CipherTransformClosure() {
+  // eslint-disable-next-line no-shadow
   function CipherTransform(stringCipherConstructor, streamCipherConstructor) {
     this.StringCipherConstructor = stringCipherConstructor;
     this.StreamCipherConstructor = streamCipherConstructor;
@@ -1661,6 +1667,7 @@ var CipherTransformFactory = (function CipherTransformFactoryClosure() {
 
   var identityName = Name.get("Identity");
 
+  // eslint-disable-next-line no-shadow
   function CipherTransformFactory(dict, fileId, password) {
     var filter = dict.get("Filter");
     if (!isName(filter, "Standard")) {