Remove SystemJS usage from the development viewer and the unit-tests

gulpfile.js

@@ -185,6 +185,19 @@ function createWebpackConfig(defines, output) {
     !bundleDefines.TESTING;
   var skipBabel = bundleDefines.SKIP_BABEL;
 
+  // `core-js` (see https://github.com/zloirock/core-js/issues/514),
+  // `web-streams-polyfill` (already using a transpiled file), and
+  // `src/core/{glyphlist,unicode}.js` (Babel is too slow for those when
+  // source-maps are enabled) should be excluded from processing.
+  const babelExcludes = [
+    "node_modules[\\\\\\/]core-js",
+    "node_modules[\\\\\\/]web-streams-polyfill",
+  ];
+  if (enableSourceMaps) {
+    babelExcludes.push("src[\\\\\\/]core[\\\\\\/](glyphlist|unicode)");
+  }
+  const babelExcludeRegExp = new RegExp(`(${babelExcludes.join("|")})`);
+
   // Required to expose e.g., the `window` object.
   output.globalObject = "this";
 
@@ -209,11 +222,7 @@ function createWebpackConfig(defines, output) {
       rules: [
         {
           loader: "babel-loader",
-          // `core-js` (see https://github.com/zloirock/core-js/issues/514),
-          // `web-streams-polyfill` (already using a transpiled file), and
-          // `src/core/{glyphlist,unicode}.js` (Babel is too slow for those)
-          // should be excluded from processing.
-          exclude: /(node_modules[\\\/]core-js|node_modules[\\\/]web-streams-polyfill|src[\\\/]core[\\\/](glyphlist|unicode))/,
+          exclude: babelExcludeRegExp,
           options: {
             presets: skipBabel ? undefined : ["@babel/preset-env"],
             plugins: [

src/core/core_utils.js

@@ -27,6 +27,22 @@ function getLookupTableFactory(initializer) {
   };
 }
 
+function getArrayLookupTableFactory(initializer) {
+  let lookup;
+  return function () {
+    if (initializer) {
+      let arr = initializer();
+      initializer = null;
+      lookup = Object.create(null);
+      for (let i = 0, ii = arr.length; i < ii; i += 2) {
+        lookup[arr[i]] = arr[i + 1];
+      }
+      arr = null;
+    }
+    return lookup;
+  };
+}
+
 class MissingDataException extends BaseException {
   constructor(begin, end) {
     super(`Missing data [${begin}, ${end})`);
@@ -212,6 +228,7 @@ function escapePDFName(str) {
 export {
   escapePDFName,
   getLookupTableFactory,
+  getArrayLookupTableFactory,
   MissingDataException,
   XRefEntryException,
   XRefParseException,