Explicitly label standalone tokens and words.

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

@@ -1,6 +1,6 @@
 export function ClassDeclaration(node: Object) {
   this.printJoin(node.decorators, node);
-  this.push("class");
+  this.word("class");
 
   if (node.id) {
     this.push(" ");
@@ -11,7 +11,7 @@ export function ClassDeclaration(node: Object) {
 
   if (node.superClass) {
     this.push(" ");
-    this.push("extends");
+    this.word("extends");
     this.push(" ");
     this.print(node.superClass, node);
     this.print(node.superTypeParameters, node);
@@ -19,7 +19,7 @@ export function ClassDeclaration(node: Object) {
 
   if (node.implements) {
     this.push(" ");
-    this.push("implements");
+    this.word("implements");
     this.push(" ");
     this.printList(node.implements, node);
   }
@@ -31,10 +31,10 @@ export function ClassDeclaration(node: Object) {
 export { ClassDeclaration as ClassExpression };
 
 export function ClassBody(node: Object) {
-  this.push("{");
+  this.token("{");
   this.printInnerComments(node);
   if (node.body.length === 0) {
-    this.push("}");
+    this.token("}");
   } else {
     this.newline();
 
@@ -50,14 +50,14 @@ export function ClassProperty(node: Object) {
   this.printJoin(node.decorators, node);
 
   if (node.static) {
-    this.push("static");
+    this.word("static");
     this.push(" ");
   }
   this.print(node.key, node);
   this.print(node.typeAnnotation, node);
   if (node.value) {
     this.space();
-    this.push("=");
+    this.token("=");
     this.space();
     this.print(node.value, node);
   }
@@ -68,12 +68,12 @@ export function ClassMethod(node: Object) {
   this.printJoin(node.decorators, node);
 
   if (node.static) {
-    this.push("static");
+    this.word("static");
     this.push(" ");
   }
 
   if (node.kind === "constructorCall") {
-    this.push("call");
+    this.word("call");
     this.push(" ");
   }