Fix unsafe parameter coercions related to PragmaPseudoMap

Author: ahejlsberg

Diff for: src/compiler/parser.ts

@@ -7784,7 +7784,7 @@ namespace ts {
                     const referencedFiles = context.referencedFiles;
                     const typeReferenceDirectives = context.typeReferenceDirectives;
                     const libReferenceDirectives = context.libReferenceDirectives;
-                    forEach(toArray(entryOrList), (arg: PragmaPseudoMap["reference"]) => {
+                    forEach(toArray(entryOrList) as PragmaPseudoMap["reference"][], arg => {
                         const { types, lib, path } = arg.arguments;
                         if (arg.arguments["no-default-lib"]) {
                             context.hasNoDefaultLib = true;
@@ -7806,8 +7806,8 @@ namespace ts {
                 }
                 case "amd-dependency": {
                     context.amdDependencies = map(
-                        toArray(entryOrList),
-                        (x: PragmaPseudoMap["amd-dependency"]) => ({ name: x.arguments.name, path: x.arguments.path }));
+                        toArray(entryOrList) as PragmaPseudoMap["amd-dependency"][],
+                        x => ({ name: x.arguments.name, path: x.arguments.path }));
                     break;
                 }
                 case "amd-module": {