only use GeneratorBuffer::space if it's for pretty printing so we can drop all spaces easily

lib/6to5/generation/generators/expressions.js

@@ -112,7 +112,9 @@ exports.LogicalExpression =
 exports.AssignmentPattern =
 exports.AssignmentExpression = function (node, print) {
   print(node.left);
-  this.push(" " + node.operator + " ");
+  this.space();
+  this.push(node.operator);
+  this.space();
   print(node.right);
 };
 

lib/6to5/generation/generators/jsx.js

@@ -63,7 +63,7 @@ exports.JSXOpeningElement = function (node, print) {
   this.push("<");
   print(node.name);
   if (node.attributes.length > 0) {
-    this.space();
+    this.push(" ");
     print.join(node.attributes, { separator: " " });
   }
   this.push(node.selfClosing ? " />" : ">");

lib/6to5/generation/generators/methods.js

@@ -36,7 +36,7 @@ exports._method = function (node, print) {
   }
 
   this._params(value, print);
-  this.space();
+  this.push(" ");
   print(value.body);
 };
 
@@ -45,8 +45,11 @@ exports.FunctionExpression = function (node, print) {
   if (node.async) this.push("async ");
   this.push("function");
   if (node.generator) this.push("*");
-  this.space();
-  if (node.id) print(node.id);
+  this.push(" ");
+  if (node.id) {
+    this.space();
+    print(node.id);
+  }
   this._params(node, print);
   this.space();
   print(node.body);

lib/6to5/generation/generators/statements.js

@@ -15,12 +15,13 @@ exports.IfStatement = function (node, print) {
   this.keyword("if");
   this.push("(");
   print(node.test);
-  this.push(") ");
+  this.push(")");
+  this.space();
 
   print.indentOnComments(node.consequent);
 
   if (node.alternate) {
-    if (this.isLast("}")) this.space();
+    if (this.isLast("}")) this.push(" ");
     this.keyword("else");
     print.indentOnComments(node.alternate);
   }
@@ -34,13 +35,13 @@ exports.ForStatement = function (node, print) {
   this.push(";");
 
   if (node.test) {
-    this.space();
+    this.push(" ");
     print(node.test);
   }
   this.push(";");
 
   if (node.update) {
-    this.space();
+    this.push(" ");
     print(node.update);
   }
 
@@ -87,7 +88,7 @@ var buildLabelStatement = function (prefix, key) {
 
     var label = node[key || "label"];
     if (label) {
-      this.space();
+      this.push(" ");
       print(label);
     }
 
@@ -144,7 +145,9 @@ exports.SwitchStatement = function (node, print) {
   this.keyword("switch");
   this.push("(");
   print(node.discriminant);
-  this.push(") {");
+  this.push(")");
+  this.space();
+  this.push("{");
   print.sequence(node.cases, { indent: true });
   this.push("}");
 };
@@ -203,7 +206,9 @@ exports.PrivateDeclaration = function (node, print) {
 exports.VariableDeclarator = function (node, print) {
   if (node.init) {
     print(node.id);
-    this.push(" = ");
+    this.space();
+    this.push("=");
+    this.space();
     print(node.init);
   } else {
     print(node.id);