Merge pull request #89 from emberjs/wire-default

bugfix: wire is the default outputFormat

Author: ef4

src/node-main.ts

@@ -56,7 +56,7 @@ async function handleNodeSpecificOptions(opts: Options): Promise<SharedOptions>
   } else if (opts.compiler) {
     assertTemplateCompiler(opts.compiler);
     compiler = opts.compiler;
-  } else if (opts.targetFormat === 'wire') {
+  } else if ((opts.targetFormat ?? 'wire') === 'wire') {
     let mod: any = await cwdImport('ember-source/dist/ember-template-compiler.js');
     assertTemplateCompiler(mod);
     compiler = mod;