[babel 8] Output minimal strings by default (#12675)

Co-authored-by: Justin Ridgewell <justin@ridgewell.name>
Co-authored-by: Justin Ridgewell <jridgewell@google.com>

packages/babel-generator/src/generators/types.js

@@ -203,8 +203,6 @@ export function StringLiteral(node: Object) {
     return;
   }
 
-  // ensure the output is ASCII-safe
-
   const val = jsesc(
     node.value,
     process.env.BABEL_8_BREAKING

packages/babel-generator/src/index.js

@@ -55,6 +55,7 @@ function normalizeOptions(code, opts): Format {
     jsescOption: {
       quotes: "double",
       wrap: true,
+      minimal: true,
       ...opts.jsescOption,
     },
     recordAndTupleSyntaxType: opts.recordAndTupleSyntaxType,
@@ -62,6 +63,7 @@ function normalizeOptions(code, opts): Format {
 
   if (!process.env.BABEL_8_BREAKING) {
     format.jsonCompatibleStrings = opts.jsonCompatibleStrings;
+    delete format.jsescOption.minimal;
   }
 
   if (format.minified) {