Explicitly label standalone tokens and words.

packages/babel-generator/src/buffer.js

@@ -98,7 +98,7 @@ export default class Buffer {
    */
 
   semicolon() {
-    this.push(";");
+    this.token(";");
   }
 
   /**
@@ -110,7 +110,7 @@ export default class Buffer {
     if (this.format.minified && !this._lastPrintedIsEmptyStatement) {
       this._removeLast(";");
     }
-    this.push("}");
+    this.token("}");
   }
 
   /**
@@ -118,7 +118,7 @@ export default class Buffer {
    */
 
   keyword(name: string) {
-    this.push(name);
+    this.word(name);
     this.space();
   }
 
@@ -134,6 +134,23 @@ export default class Buffer {
     }
   }
 
+  /**
+   * Writes a token that can't be safely parsed without taking whitespace into account.
+   */
+
+  word(str: string) {
+    this.push(str);
+  }
+
+  /**
+   * Writes a simple token.
+   */
+
+  token(str: string) {
+    this.push(str);
+  }
+
+
   /**
    * Remove the last character.
    */
@@ -180,7 +197,7 @@ export default class Buffer {
     if (state.printed) {
       this.dedent();
       this.newline();
-      this.push(")");
+      this.token(")");
     }
   }
 

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

@@ -12,7 +12,7 @@ export function Program(node: Object) {
 }
 
 export function BlockStatement(node: Object) {
-  this.push("{");
+  this.token("{");
   this.printInnerComments(node);
   if (node.body.length) {
     this.newline();
@@ -27,7 +27,7 @@ export function BlockStatement(node: Object) {
     this.rightBrace();
   } else {
     this.source("end", node.loc);
-    this.push("}");
+    this.token("}");
   }
 }
 

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(" ");
   }
 

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

@@ -21,47 +21,51 @@ export function UnaryExpression(node: Object) {
     needsSpace = false;
   }
 
-  this.push(node.operator);
+  if (node.operator === "void" || node.operator === "delete" || node.operator === "typeof") {
+    this.word(node.operator);
+  } else {
+    this.token(node.operator);
+  }
   if (needsSpace) this.push(" ");
   this.print(node.argument, node);
 }
 
 export function DoExpression(node: Object) {
-  this.push("do");
+  this.word("do");
   this.space();
   this.print(node.body, node);
 }
 
 export function ParenthesizedExpression(node: Object) {
-  this.push("(");
+  this.token("(");
   this.print(node.expression, node);
-  this.push(")");
+  this.token(")");
 }
 
 export function UpdateExpression(node: Object) {
   if (node.prefix) {
-    this.push(node.operator);
+    this.token(node.operator);
     this.print(node.argument, node);
   } else {
     this.print(node.argument, node);
-    this.push(node.operator);
+    this.token(node.operator);
   }
 }
 
 export function ConditionalExpression(node: Object) {
   this.print(node.test, node);
   this.space();
-  this.push("?");
+  this.token("?");
   this.space();
   this.print(node.consequent, node);
   this.space();
-  this.push(":");
+  this.token(":");
   this.space();
   this.print(node.alternate, node);
 }
 
 export function NewExpression(node: Object, parent: Object) {
-  this.push("new");
+  this.word("new");
   this.push(" ");
   this.print(node.callee, node);
   if (node.arguments.length === 0 && this.format.minified &&
@@ -69,9 +73,9 @@ export function NewExpression(node: Object, parent: Object) {
       !t.isMemberExpression(parent) &&
       !t.isNewExpression(parent)) return;
 
-  this.push("(");
+  this.token("(");
   this.printList(node.arguments, node);
-  this.push(")");
+  this.token(")");
 }
 
 export function SequenceExpression(node: Object) {
@@ -79,21 +83,21 @@ export function SequenceExpression(node: Object) {
 }
 
 export function ThisExpression() {
-  this.push("this");
+  this.word("this");
 }
 
 export function Super() {
-  this.push("super");
+  this.word("super");
 }
 
 export function Decorator(node: Object) {
-  this.push("@");
+  this.token("@");
   this.print(node.expression, node);
   this.newline();
 }
 
 function commaSeparatorNewline() {
-  this.push(",");
+  this.token(",");
   this.push("\n");
 }
 
@@ -101,7 +105,7 @@ export function CallExpression(node: Object) {
   this.print(node.callee, node);
   if (node.loc) this.printAuxAfterComment();
 
-  this.push("(");
+  this.token("(");
 
   let isPrettyCall = node._prettyCall && !this.format.retainLines && !this.format.compact;
 
@@ -119,15 +123,15 @@ export function CallExpression(node: Object) {
     this.dedent();
   }
 
-  this.push(")");
+  this.token(")");
 }
 
 function buildYieldAwait(keyword: string) {
   return function (node: Object) {
-    this.push(keyword);
+    this.word(keyword);
 
     if (node.delegate) {
-      this.push("*");
+      this.token("*");
     }
 
     if (node.argument) {
@@ -155,7 +159,7 @@ export function ExpressionStatement(node: Object) {
 export function AssignmentPattern(node: Object) {
   this.print(node.left, node);
   this.space();
-  this.push("=");
+  this.token("=");
   this.space();
   this.print(node.right, node);
 }
@@ -167,7 +171,7 @@ export function AssignmentExpression(node: Object, parent: Object) {
                !n.needsParens(node, parent);
 
   if (parens) {
-    this.push("(");
+    this.token("(");
   }
 
   this.print(node.left, node);
@@ -175,7 +179,11 @@ export function AssignmentExpression(node: Object, parent: Object) {
   let spaces = !this.format.compact || node.operator === "in" || node.operator === "instanceof";
   if (spaces) this.push(" ");
 
-  this.push(node.operator);
+  if (node.operator === "in" || node.operator === "instanceof") {
+    this.word(node.operator);
+  } else {
+    this.token(node.operator);
+  }
 
   if (!spaces) {
     // space is mandatory to avoid outputting <!--
@@ -197,13 +205,13 @@ export function AssignmentExpression(node: Object, parent: Object) {
   this.print(node.right, node);
 
   if (parens) {
-    this.push(")");
+    this.token(")");
   }
 }
 
 export function BindExpression(node: Object) {
   this.print(node.object, node);
-  this.push("::");
+  this.token("::");
   this.print(node.callee, node);
 }
 
@@ -225,9 +233,9 @@ export function MemberExpression(node: Object) {
   }
 
   if (computed) {
-    this.push("[");
+    this.token("[");
     this.print(node.property, node);
-    this.push("]");
+    this.token("]");
   } else {
     if (t.isNumericLiteral(node.object)) {
       let val = this.getPossibleRaw(node.object) || node.object.value;
@@ -236,18 +244,18 @@ export function MemberExpression(node: Object) {
         !SCIENTIFIC_NOTATION.test(val) &&
         !ZERO_DECIMAL_INTEGER.test(val) &&
         !this.endsWith(".")) {
-        this.push(".");
+        this.token(".");
       }
     }
 
-    this.push(".");
+    this.token(".");
     this.print(node.property, node);
   }
 }
 
 export function MetaProperty(node: Object) {
   this.print(node.meta, node);
-  this.push(".");
+  this.token(".");
   this.print(node.property, node);
 }
 

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

@@ -3,39 +3,39 @@
 import * as t from "babel-types";
 
 export function AnyTypeAnnotation() {
-  this.push("any");
+  this.word("any");
 }
 
 export function ArrayTypeAnnotation(node: Object) {
   this.print(node.elementType, node);
-  this.push("[");
-  this.push("]");
+  this.token("[");
+  this.token("]");
 }
 
 export function BooleanTypeAnnotation() {
-  this.push("bool");
+  this.word("bool");
 }
 
 export function BooleanLiteralTypeAnnotation(node: Object) {
-  this.push(node.value ? "true" : "false");
+  this.word(node.value ? "true" : "false");
 }
 
 export function NullLiteralTypeAnnotation() {
-  this.push("null");
+  this.word("null");
 }
 
 export function DeclareClass(node: Object) {
-  this.push("declare");
+  this.word("declare");
   this.push(" ");
-  this.push("class");
+  this.word("class");
   this.push(" ");
   this._interfaceish(node);
 }
 
 export function DeclareFunction(node: Object) {
-  this.push("declare");
+  this.word("declare");
   this.push(" ");
-  this.push("function");
+  this.word("function");
   this.push(" ");
   this.print(node.id, node);
   this.print(node.id.typeAnnotation.typeAnnotation, node);
@@ -43,15 +43,15 @@ export function DeclareFunction(node: Object) {
 }
 
 export function DeclareInterface(node: Object) {
-  this.push("declare");
+  this.word("declare");
   this.push(" ");
   this.InterfaceDeclaration(node);
 }
 
 export function DeclareModule(node: Object) {
-  this.push("declare");
+  this.word("declare");
   this.push(" ");
-  this.push("module");
+  this.word("module");
   this.push(" ");
   this.print(node.id, node);
   this.space();
@@ -59,15 +59,15 @@ export function DeclareModule(node: Object) {
 }
 
 export function DeclareTypeAlias(node: Object) {
-  this.push("declare");
+  this.word("declare");
   this.push(" ");
   this.TypeAlias(node);
 }
 
 export function DeclareVariable(node: Object) {
-  this.push("declare");
+  this.word("declare");
   this.push(" ");
-  this.push("var");
+  this.word("var");
   this.push(" ");
   this.print(node.id, node);
   this.print(node.id.typeAnnotation, node);
@@ -75,31 +75,31 @@ export function DeclareVariable(node: Object) {
 }
 
 export function ExistentialTypeParam() {
-  this.push("*");
+  this.token("*");
 }
 
 export function FunctionTypeAnnotation(node: Object, parent: Object) {
   this.print(node.typeParameters, node);
-  this.push("(");
+  this.token("(");
   this.printList(node.params, node);
 
   if (node.rest) {
     if (node.params.length) {
-      this.push(",");
+      this.token(",");
       this.space();
     }
-    this.push("...");
+    this.token("...");
     this.print(node.rest, node);
   }
 
-  this.push(")");
+  this.token(")");
 
   // this node type is overloaded, not sure why but it makes it EXTREMELY annoying
   if (parent.type === "ObjectTypeProperty" || parent.type === "ObjectTypeCallProperty" || parent.type === "DeclareFunction") {
-    this.push(":");
+    this.token(":");
   } else {
     this.space();
-    this.push("=>");
+    this.token("=>");
   }
 
   this.space();
@@ -108,8 +108,8 @@ export function FunctionTypeAnnotation(node: Object, parent: Object) {
 
 export function FunctionTypeParam(node: Object) {
   this.print(node.name, node);
-  if (node.optional) this.push("?");
-  this.push(":");
+  if (node.optional) this.token("?");
+  this.token(":");
   this.space();
   this.print(node.typeAnnotation, node);
 }
@@ -126,13 +126,13 @@ export function _interfaceish(node: Object) {
   this.print(node.typeParameters, node);
   if (node.extends.length) {
     this.push(" ");
-    this.push("extends");
+    this.word("extends");
     this.push(" ");
     this.printList(node.extends, node);
   }
   if (node.mixins && node.mixins.length) {
     this.push(" ");
-    this.push("mixins");
+    this.word("mixins");
     this.push(" ");
     this.printList(node.mixins, node);
   }
@@ -141,14 +141,14 @@ export function _interfaceish(node: Object) {
 }
 
 export function InterfaceDeclaration(node: Object) {
-  this.push("interface");
+  this.word("interface");
   this.push(" ");
   this._interfaceish(node);
 }
 
 function andSeparator() {
   this.push(" ");
-  this.push("&");
+  this.token("&");
   this.push(" ");
 }
 
@@ -157,11 +157,11 @@ export function IntersectionTypeAnnotation(node: Object) {
 }
 
 export function MixedTypeAnnotation() {
-  this.push("mixed");
+  this.word("mixed");
 }
 
 export function NullableTypeAnnotation(node: Object) {
-  this.push("?");
+  this.token("?");
   this.print(node.typeAnnotation, node);
 }
 
@@ -171,56 +171,56 @@ export {
 } from "./types";
 
 export function NumberTypeAnnotation() {
-  this.push("number");
+  this.word("number");
 }
 
 export function StringTypeAnnotation() {
-  this.push("string");
+  this.word("string");
 }
 
 export function ThisTypeAnnotation() {
-  this.push("this");
+  this.word("this");
 }
 
 export function TupleTypeAnnotation(node: Object) {
-  this.push("[");
+  this.token("[");
   this.printList(node.types, node);
-  this.push("]");
+  this.token("]");
 }
 
 export function TypeofTypeAnnotation(node: Object) {
-  this.push("typeof");
+  this.word("typeof");
   this.push(" ");
   this.print(node.argument, node);
 }
 
 export function TypeAlias(node: Object) {
-  this.push("type");
+  this.word("type");
   this.push(" ");
   this.print(node.id, node);
   this.print(node.typeParameters, node);
   this.space();
-  this.push("=");
+  this.token("=");
   this.space();
   this.print(node.right, node);
   this.semicolon();
 }
 
 export function TypeAnnotation(node: Object) {
-  this.push(":");
+  this.token(":");
   this.space();
-  if (node.optional) this.push("?");
+  if (node.optional) this.token("?");
   this.print(node.typeAnnotation, node);
 }
 
 export function TypeParameter(node: Object) {
   if (node.variance === "plus") {
-    this.push("+");
+    this.token("+");
   } else if (node.variance === "minus") {
-    this.push("-");
+    this.token("-");
   }
 
-  this.push(node.name);
+  this.word(node.name);
 
   if (node.bound) {
     this.print(node.bound, node);
@@ -228,26 +228,26 @@ export function TypeParameter(node: Object) {
 
   if (node.default) {
     this.space();
-    this.push("=");
+    this.token("=");
     this.space();
     this.print(node.default, node);
   }
 }
 
 export function TypeParameterInstantiation(node: Object) {
-  this.push("<");
+  this.token("<");
   this.printList(node.params, node, {
     iterator: (node: Object) => {
       this.print(node.typeAnnotation, node);
     }
   });
-  this.push(">");
+  this.token(">");
 }
 
 export { TypeParameterInstantiation as TypeParameterDeclaration };
 
 export function ObjectTypeAnnotation(node: Object) {
-  this.push("{");
+  this.token("{");
   let props = node.properties.concat(node.callProperties, node.indexers);
 
   if (props.length) {
@@ -266,12 +266,12 @@ export function ObjectTypeAnnotation(node: Object) {
     this.space();
   }
 
-  this.push("}");
+  this.token("}");
 }
 
 export function ObjectTypeCallProperty(node: Object) {
   if (node.static) {
-    this.push("static");
+    this.word("static");
     this.push(" ");
   }
   this.print(node.value, node);
@@ -279,29 +279,29 @@ export function ObjectTypeCallProperty(node: Object) {
 
 export function ObjectTypeIndexer(node: Object) {
   if (node.static) {
-    this.push("static");
+    this.word("static");
     this.push(" ");
   }
-  this.push("[");
+  this.token("[");
   this.print(node.id, node);
-  this.push(":");
+  this.token(":");
   this.space();
   this.print(node.key, node);
-  this.push("]");
-  this.push(":");
+  this.token("]");
+  this.token(":");
   this.space();
   this.print(node.value, node);
 }
 
 export function ObjectTypeProperty(node: Object) {
   if (node.static) {
-    this.push("static");
+    this.word("static");
     this.push(" ");
   }
   this.print(node.key, node);
-  if (node.optional) this.push("?");
+  if (node.optional) this.token("?");
   if (!t.isFunctionTypeAnnotation(node.value)) {
-    this.push(":");
+    this.token(":");
     this.space();
   }
   this.print(node.value, node);
@@ -309,13 +309,13 @@ export function ObjectTypeProperty(node: Object) {
 
 export function QualifiedTypeIdentifier(node: Object) {
   this.print(node.qualification, node);
-  this.push(".");
+  this.token(".");
   this.print(node.id, node);
 }
 
 function orSeparator() {
   this.push(" ");
-  this.push("|");
+  this.token("|");
   this.push(" ");
 }
 
@@ -324,12 +324,12 @@ export function UnionTypeAnnotation(node: Object) {
 }
 
 export function TypeCastExpression(node: Object) {
-  this.push("(");
+  this.token("(");
   this.print(node.expression, node);
   this.print(node.typeAnnotation, node);
-  this.push(")");
+  this.token(")");
 }
 
 export function VoidTypeAnnotation() {
-  this.push("void");
+  this.word("void");
 }

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

@@ -1,42 +1,42 @@
 export function JSXAttribute(node: Object) {
   this.print(node.name, node);
   if (node.value) {
-    this.push("=");
+    this.token("=");
     this.print(node.value, node);
   }
 }
 
 export function JSXIdentifier(node: Object) {
-  this.push(node.name);
+  this.word(node.name);
 }
 
 export function JSXNamespacedName(node: Object) {
   this.print(node.namespace, node);
-  this.push(":");
+  this.token(":");
   this.print(node.name, node);
 }
 
 export function JSXMemberExpression(node: Object) {
   this.print(node.object, node);
-  this.push(".");
+  this.token(".");
   this.print(node.property, node);
 }
 
 export function JSXSpreadAttribute(node: Object) {
-  this.push("{");
-  this.push("...");
+  this.token("{");
+  this.token("...");
   this.print(node.argument, node);
-  this.push("}");
+  this.token("}");
 }
 
 export function JSXExpressionContainer(node: Object) {
-  this.push("{");
+  this.token("{");
   this.print(node.expression, node);
-  this.push("}");
+  this.token("}");
 }
 
 export function JSXText(node: Object) {
-  this.push(node.value);
+  this.token(node.value);
 }
 
 export function JSXElement(node: Object) {
@@ -58,7 +58,7 @@ function spaceSeparator() {
 }
 
 export function JSXOpeningElement(node: Object) {
-  this.push("<");
+  this.token("<");
   this.print(node.name, node);
   if (node.attributes.length > 0) {
     this.push(" ");
@@ -66,16 +66,16 @@ export function JSXOpeningElement(node: Object) {
   }
   if (node.selfClosing) {
     this.push(" ");
-    this.push("/>");
+    this.token("/>");
   } else {
-    this.push(">");
+    this.token(">");
   }
 }
 
 export function JSXClosingElement(node: Object) {
-  this.push("</");
+  this.token("</");
   this.print(node.name, node);
-  this.push(">");
+  this.token(">");
 }
 
 export function JSXEmptyExpression() {}

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

@@ -2,14 +2,14 @@ import * as t from "babel-types";
 
 export function _params(node: Object) {
   this.print(node.typeParameters, node);
-  this.push("(");
+  this.token("(");
   this.printList(node.params, node, {
     iterator: (node) => {
-      if (node.optional) this.push("?");
+      if (node.optional) this.token("?");
       this.print(node.typeAnnotation, node);
     }
   });
-  this.push(")");
+  this.token(")");
 
   if (node.returnType) {
     this.print(node.returnType, node);
@@ -22,24 +22,24 @@ export function _method(node: Object) {
 
   if (kind === "method" || kind === "init") {
     if (node.generator) {
-      this.push("*");
+      this.token("*");
     }
   }
 
   if (kind === "get" || kind === "set") {
-    this.push(kind);
+    this.word(kind);
     this.push(" ");
   }
 
   if (node.async) {
-    this.push("async");
+    this.word("async");
     this.push(" ");
   }
 
   if (node.computed) {
-    this.push("[");
+    this.token("[");
     this.print(key, node);
-    this.push("]");
+    this.token("]");
   } else {
     this.print(key, node);
   }
@@ -51,11 +51,11 @@ export function _method(node: Object) {
 
 export function FunctionExpression(node: Object) {
   if (node.async) {
-    this.push("async");
+    this.word("async");
     this.push(" ");
   }
-  this.push("function");
-  if (node.generator) this.push("*");
+  this.word("function");
+  if (node.generator) this.token("*");
 
   if (node.id) {
     this.push(" ");
@@ -73,7 +73,7 @@ export { FunctionExpression as FunctionDeclaration };
 
 export function ArrowFunctionExpression(node: Object) {
   if (node.async) {
-    this.push("async");
+    this.word("async");
     this.push(" ");
   }
 
@@ -84,7 +84,7 @@ export function ArrowFunctionExpression(node: Object) {
   }
 
   this.push(" ");
-  this.push("=>");
+  this.token("=>");
   this.push(" ");
 
   this.print(node.body, node);

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

@@ -4,7 +4,7 @@ export function ImportSpecifier(node: Object) {
   this.print(node.imported, node);
   if (node.local && node.local.name !== node.imported.name) {
     this.push(" ");
-    this.push("as");
+    this.word("as");
     this.push(" ");
     this.print(node.local, node);
   }
@@ -22,47 +22,47 @@ export function ExportSpecifier(node: Object) {
   this.print(node.local, node);
   if (node.exported && node.local.name !== node.exported.name) {
     this.push(" ");
-    this.push("as");
+    this.word("as");
     this.push(" ");
     this.print(node.exported, node);
   }
 }
 
 export function ExportNamespaceSpecifier(node: Object) {
-  this.push("*");
+  this.token("*");
   this.push(" ");
-  this.push("as");
+  this.word("as");
   this.push(" ");
   this.print(node.exported, node);
 }
 
 export function ExportAllDeclaration(node: Object) {
-  this.push("export");
+  this.word("export");
   this.push(" ");
-  this.push("*");
+  this.token("*");
   if (node.exported) {
     this.push(" ");
-    this.push("as");
+    this.word("as");
     this.push(" ");
     this.print(node.exported, node);
   }
   this.push(" ");
-  this.push("from");
+  this.word("from");
   this.push(" ");
   this.print(node.source, node);
   this.semicolon();
 }
 
 export function ExportNamedDeclaration() {
-  this.push("export");
+  this.word("export");
   this.push(" ");
   ExportDeclaration.apply(this, arguments);
 }
 
 export function ExportDefaultDeclaration() {
-  this.push("export");
+  this.word("export");
   this.push(" ");
-  this.push("default");
+  this.word("default");
   this.push(" ");
   ExportDeclaration.apply(this, arguments);
 }
@@ -74,7 +74,7 @@ function ExportDeclaration(node: Object) {
     if (!t.isStatement(declar)) this.semicolon();
   } else {
     if (node.exportKind === "type") {
-      this.push("type");
+      this.word("type");
       this.push(" ");
     }
 
@@ -88,7 +88,7 @@ function ExportDeclaration(node: Object) {
         hasSpecial = true;
         this.print(specifiers.shift(), node);
         if (specifiers.length) {
-          this.push(",");
+          this.token(",");
           this.push(" ");
         }
       } else {
@@ -97,18 +97,18 @@ function ExportDeclaration(node: Object) {
     }
 
     if (specifiers.length || (!specifiers.length && !hasSpecial)) {
-      this.push("{");
+      this.token("{");
       if (specifiers.length) {
         this.space();
         this.printList(specifiers, node);
         this.space();
       }
-      this.push("}");
+      this.token("}");
     }
 
     if (node.source) {
       this.push(" ");
-      this.push("from");
+      this.word("from");
       this.push(" ");
       this.print(node.source, node);
     }
@@ -118,11 +118,11 @@ function ExportDeclaration(node: Object) {
 }
 
 export function ImportDeclaration(node: Object) {
-  this.push("import");
+  this.word("import");
   this.push(" ");
 
   if (node.importKind === "type" || node.importKind === "typeof") {
-    this.push(node.importKind);
+    this.word(node.importKind);
     this.push(" ");
   }
 
@@ -134,7 +134,7 @@ export function ImportDeclaration(node: Object) {
       if (t.isImportDefaultSpecifier(first) || t.isImportNamespaceSpecifier(first)) {
         this.print(specifiers.shift(), node);
         if (specifiers.length) {
-          this.push(",");
+          this.token(",");
           this.push(" ");
         }
       } else {
@@ -143,15 +143,15 @@ export function ImportDeclaration(node: Object) {
     }
 
     if (specifiers.length) {
-      this.push("{");
+      this.token("{");
       this.space();
       this.printList(specifiers, node);
       this.space();
-      this.push("}");
+      this.token("}");
     }
 
     this.push(" ");
-    this.push("from");
+    this.word("from");
     this.push(" ");
   }
 
@@ -160,9 +160,9 @@ export function ImportDeclaration(node: Object) {
 }
 
 export function ImportNamespaceSpecifier(node: Object) {
-  this.push("*");
+  this.token("*");
   this.push(" ");
-  this.push("as");
+  this.word("as");
   this.push(" ");
   this.print(node.local, node);
 }

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

@@ -4,22 +4,22 @@ const NON_ALPHABETIC_UNARY_OPERATORS = t.UPDATE_OPERATORS.concat(t.NUMBER_UNARY_
 
 export function WithStatement(node: Object) {
   this.keyword("with");
-  this.push("(");
+  this.token("(");
   this.print(node.object, node);
-  this.push(")");
+  this.token(")");
   this.printBlock(node);
 }
 
 export function IfStatement(node: Object) {
   this.keyword("if");
-  this.push("(");
+  this.token("(");
   this.print(node.test, node);
-  this.push(")");
+  this.token(")");
   this.space();
 
   let needsBlock = node.alternate && t.isIfStatement(getLastStatement(node.consequent));
   if (needsBlock) {
-    this.push("{");
+    this.token("{");
     this.newline();
     this.indent();
   }
@@ -29,12 +29,12 @@ export function IfStatement(node: Object) {
   if (needsBlock) {
     this.dedent();
     this.newline();
-    this.push("}");
+    this.token("}");
   }
 
   if (node.alternate) {
     if (this.endsWith("}")) this.space();
-    this.push("else");
+    this.word("else");
     this.push(" ");
     this.printAndIndentOnComments(node.alternate, node);
   }
@@ -48,46 +48,46 @@ function getLastStatement(statement) {
 
 export function ForStatement(node: Object) {
   this.keyword("for");
-  this.push("(");
+  this.token("(");
 
   this._inForStatementInitCounter++;
   this.print(node.init, node);
   this._inForStatementInitCounter--;
-  this.push(";");
+  this.token(";");
 
   if (node.test) {
     this.space();
     this.print(node.test, node);
   }
-  this.push(";");
+  this.token(";");
 
   if (node.update) {
     this.space();
     this.print(node.update, node);
   }
 
-  this.push(")");
+  this.token(")");
   this.printBlock(node);
 }
 
 export function WhileStatement(node: Object) {
   this.keyword("while");
-  this.push("(");
+  this.token("(");
   this.print(node.test, node);
-  this.push(")");
+  this.token(")");
   this.printBlock(node);
 }
 
 let buildForXStatement = function (op) {
   return function (node: Object) {
     this.keyword("for");
-    this.push("(");
+    this.token("(");
     this.print(node.left, node);
     this.push(" ");
-    this.push(op);
+    this.word(op);
     this.push(" ");
     this.print(node.right, node);
-    this.push(")");
+    this.token(")");
     this.printBlock(node);
   };
 };
@@ -96,20 +96,20 @@ export let ForInStatement = buildForXStatement("in");
 export let ForOfStatement = buildForXStatement("of");
 
 export function DoWhileStatement(node: Object) {
-  this.push("do");
+  this.word("do");
   this.push(" ");
   this.print(node.body, node);
   this.space();
   this.keyword("while");
-  this.push("(");
+  this.token("(");
   this.print(node.test, node);
-  this.push(")");
+  this.token(")");
   this.semicolon();
 }
 
 function buildLabelStatement(prefix, key = "label") {
   return function (node: Object) {
-    this.push(prefix);
+    this.word(prefix);
 
     let label = node[key];
     if (label) {
@@ -136,7 +136,7 @@ export let ThrowStatement    = buildLabelStatement("throw", "argument");
 
 export function LabeledStatement(node: Object) {
   this.print(node.label, node);
-  this.push(":");
+  this.token(":");
   this.push(" ");
   this.print(node.body, node);
 }
@@ -157,7 +157,7 @@ export function TryStatement(node: Object) {
 
   if (node.finalizer) {
     this.space();
-    this.push("finally");
+    this.word("finally");
     this.push(" ");
     this.print(node.finalizer, node);
   }
@@ -165,20 +165,20 @@ export function TryStatement(node: Object) {
 
 export function CatchClause(node: Object) {
   this.keyword("catch");
-  this.push("(");
+  this.token("(");
   this.print(node.param, node);
-  this.push(")");
+  this.token(")");
   this.space();
   this.print(node.body, node);
 }
 
 export function SwitchStatement(node: Object) {
   this.keyword("switch");
-  this.push("(");
+  this.token("(");
   this.print(node.discriminant, node);
-  this.push(")");
+  this.token(")");
   this.space();
-  this.push("{");
+  this.token("{");
 
   this.printSequence(node.cases, node, {
     indent: true,
@@ -187,18 +187,18 @@ export function SwitchStatement(node: Object) {
     }
   });
 
-  this.push("}");
+  this.token("}");
 }
 
 export function SwitchCase(node: Object) {
   if (node.test) {
-    this.push("case");
+    this.word("case");
     this.push(" ");
     this.print(node.test, node);
-    this.push(":");
+    this.token(":");
   } else {
-    this.push("default");
-    this.push(":");
+    this.word("default");
+    this.token(":");
   }
 
   if (node.consequent.length) {
@@ -208,26 +208,26 @@ export function SwitchCase(node: Object) {
 }
 
 export function DebuggerStatement() {
-  this.push("debugger");
+  this.word("debugger");
   this.semicolon();
 }
 
 function variableDeclarationIdent() {
   // "let " or "var " indentation.
-  this.push(",");
+  this.token(",");
   this.push("\n");
   for (let i = 0; i < 4; i++) this.push(" ");
 }
 
 function constDeclarationIdent() {
   // "const " indentation.
-  this.push(",");
+  this.token(",");
   this.push("\n");
   for (let i = 0; i < 6; i++) this.push(" ");
 }
 
 export function VariableDeclaration(node: Object, parent: Object) {
-  this.push(node.kind);
+  this.word(node.kind);
   this.push(" ");
 
   let hasInits = false;
@@ -275,7 +275,7 @@ export function VariableDeclarator(node: Object) {
   this.print(node.id.typeAnnotation, node);
   if (node.init) {
     this.space();
-    this.push("=");
+    this.token("=");
     this.space();
     this.print(node.init, node);
   }

packages/babel-generator/src/generators/template-literals.js

@@ -10,7 +10,7 @@ export function TemplateElement(node: Object, parent: Object) {
   let value = (isFirst ? "`" : "}") + node.value.raw + (isLast ? "`" : "${");
 
   if (!isFirst) this.push(" ");
-  this.push(value);
+  this.token(value);
   if (!isLast) this.push(" ");
 }
 

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

@@ -10,17 +10,17 @@ export function Identifier(node: Object) {
   // the next major.
   if (node.variance) {
     if (node.variance === "plus") {
-      this.push("+");
+      this.token("+");
     } else if (node.variance === "minus") {
-      this.push("-");
+      this.token("-");
     }
   }
 
-  this.push(node.name);
+  this.word(node.name);
 }
 
 export function RestElement(node: Object) {
-  this.push("...");
+  this.token("...");
   this.print(node.argument, node);
 }
 
@@ -33,7 +33,7 @@ export {
 export function ObjectExpression(node: Object) {
   let props = node.properties;
 
-  this.push("{");
+  this.token("{");
   this.printInnerComments(node);
 
   if (props.length) {
@@ -42,7 +42,7 @@ export function ObjectExpression(node: Object) {
     this.space();
   }
 
-  this.push("}");
+  this.token("}");
 }
 
 export { ObjectExpression as ObjectPattern };
@@ -56,9 +56,9 @@ export function ObjectProperty(node: Object) {
   this.printJoin(node.decorators, node);
 
   if (node.computed) {
-    this.push("[");
+    this.token("[");
     this.print(node.key, node);
-    this.push("]");
+    this.token("]");
   } else {
     // print `({ foo: foo = 5 } = {})` as `({ foo = 5 } = {});`
     if (t.isAssignmentPattern(node.value) && t.isIdentifier(node.key) && node.key.name === node.value.left.name) {
@@ -77,7 +77,7 @@ export function ObjectProperty(node: Object) {
     }
   }
 
-  this.push(":");
+  this.token(":");
   this.space();
   this.print(node.value, node);
 }
@@ -86,7 +86,7 @@ export function ArrayExpression(node: Object) {
   let elems = node.elements;
   let len   = elems.length;
 
-  this.push("[");
+  this.token("[");
   this.printInnerComments(node);
 
   for (let i = 0; i < elems.length; i++) {
@@ -94,48 +94,48 @@ export function ArrayExpression(node: Object) {
     if (elem) {
       if (i > 0) this.space();
       this.print(elem, node);
-      if (i < len - 1) this.push(",");
+      if (i < len - 1) this.token(",");
     } else {
       // If the array expression ends with a hole, that hole
       // will be ignored by the interpreter, but if it ends with
       // two (or more) holes, we need to write out two (or more)
       // commas so that the resulting code is interpreted with
       // both (all) of the holes.
-      this.push(",");
+      this.token(",");
     }
   }
 
-  this.push("]");
+  this.token("]");
 }
 
 export { ArrayExpression as ArrayPattern };
 
 export function RegExpLiteral(node: Object) {
-  this.push(`/${node.pattern}/${node.flags}`);
+  this.word(`/${node.pattern}/${node.flags}`);
 }
 
 export function BooleanLiteral(node: Object) {
-  this.push(node.value ? "true" : "false");
+  this.word(node.value ? "true" : "false");
 }
 
 export function NullLiteral() {
-  this.push("null");
+  this.word("null");
 }
 
 export function NumericLiteral(node: Object) {
   let raw = this.getPossibleRaw(node);
   if (raw != null) {
-    this.push(raw);
+    this.word(raw);
     return;
   }
 
-  this.push(node.value + "");
+  this.word(node.value + "");
 }
 
 export function StringLiteral(node: Object, parent: Object) {
   let raw = this.getPossibleRaw(node);
   if (raw != null) {
-    this.push(raw);
+    this.token(raw);
     return;
   }
 
@@ -160,5 +160,5 @@ export function StringLiteral(node: Object, parent: Object) {
     val = `'${val}'`;
   }
 
-  return this.push(val);
+  return this.token(val);
 }

packages/babel-generator/src/printer.js

@@ -41,7 +41,7 @@ export default class Printer extends Buffer {
     this.printAuxBeforeComment(oldInAux);
 
     let needsParens = n.needsParens(node, parent, this._printStack);
-    if (needsParens) this.push("(");
+    if (needsParens) this.token("(");
 
     this.printLeadingComments(node, parent);
 
@@ -61,7 +61,7 @@ export default class Printer extends Buffer {
 
     this.printTrailingComments(node, parent);
 
-    if (needsParens) this.push(")");
+    if (needsParens) this.token(")");
 
     // end
     this._printStack.pop();
@@ -312,7 +312,7 @@ export default class Printer extends Buffer {
 }
 
 function commaSeparator() {
-  this.push(",");
+  this.token(",");
   this.space();
 }