Fix JSON Modules (#1514)

js/compiler.ts

@@ -137,6 +137,7 @@ export class Compiler
   private readonly _options: ts.CompilerOptions = {
     allowJs: true,
     checkJs: true,
+    esModuleInterop: true,
     module: ts.ModuleKind.ESNext,
     outDir: "$deno$",
     resolveJsonModule: true,

js/compiler_test.ts

@@ -506,6 +506,7 @@ test(function compilerGetCompilationSettings() {
   const expectedKeys = [
     "allowJs",
     "checkJs",
+    "esModuleInterop",
     "module",
     "outDir",
     "resolveJsonModule",

tests/020_json_modules.ts

@@ -1,3 +1,2 @@
-import * as config from "./subdir/config.json";
-// TODO Shouldn't need 'default'
-console.log(JSON.stringify(config["default"]));
+import config from "./subdir/config.json";
+console.log(JSON.stringify(config));