Merge pull request #3152 from babel/minified-format

Add minified format option

packages/babel-core/src/transformation/file/options/config.js

@@ -106,6 +106,12 @@ module.exports = {
     description: "do not include superfluous whitespace characters and line terminators [true|false|auto]"
   },
 
+  minified: {
+    type: "boolean",
+    default: false,
+    description: "save as much bytes when printing [true|false]"
+  },
+
   sourceMap: {
     alias: "sourceMaps",
     hidden: true

packages/babel-generator/src/buffer.js

@@ -101,7 +101,7 @@ export default class Buffer {
 
   rightBrace() {
     this.newline(true);
-    if (this.format.compact && !this._lastPrintedIsEmptyStatement) {
+    if (this.format.minified && !this._lastPrintedIsEmptyStatement) {
       this._removeLast(";");
     }
     this.push("}");

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

@@ -62,7 +62,7 @@ export function ConditionalExpression(node: Object) {
 export function NewExpression(node: Object, parent: Object) {
   this.push("new ");
   this.print(node.callee, node);
-  if (node.arguments.length === 0 && this.format.compact &&
+  if (node.arguments.length === 0 && this.format.minified &&
       !t.isCallExpression(parent, { callee: node }) &&
       !t.isMemberExpression(parent) &&
       !t.isNewExpression(parent)) return;
@@ -222,7 +222,7 @@ export function MemberExpression(node: Object) {
   } else {
     if (t.isLiteral(node.object) && !t.isTemplateLiteral(node.object)) {
       let val;
-      if (this.format.compact) {
+      if (this.format.minified) {
         val = this._stringLiteral(node.object);
       } else {
         val = this.getPossibleRaw(node.object) || this._stringLiteral(node.object);

packages/babel-generator/src/index.js

@@ -40,6 +40,7 @@ export class CodeGenerator extends Printer {
     auxiliaryCommentBefore: string;
     auxiliaryCommentAfter: string;
     compact: boolean | "auto";
+    minified: boolean;
     quotes: "single" | "double";
     concise: boolean;
     indent: {
@@ -81,6 +82,7 @@ export class CodeGenerator extends Printer {
       retainLines: opts.retainLines,
       comments: opts.comments == null || opts.comments,
       compact: opts.compact,
+      minified: opts.minified,
       concise: opts.concise,
       quotes: CodeGenerator.findCommonStringDelimiter(code, tokens),
       indent: {
@@ -90,6 +92,10 @@ export class CodeGenerator extends Printer {
       }
     };
 
+    if (format.minified) {
+      format.compact = true;
+    }
+
     if (format.compact === "auto") {
       format.compact = code.length > 100000; // 100KB
 

packages/babel-generator/src/printer.js

@@ -97,11 +97,11 @@ export default class Printer extends Buffer {
   }
 
   _print(node, parent) {
-    // In compact mode we need to produce as little bytes as needed
+    // In minified mode we need to produce as little bytes as needed
     // and need to make sure that string quoting is consistent.
     // That means we have to always reprint as opposed to getting
     // the raw value.
-    if (!this.format.compact) {
+    if (!this.format.minified) {
       let extra = this.getPossibleRaw(node);
       if (extra) {
         this.push("");
@@ -238,7 +238,7 @@ export default class Printer extends Buffer {
     if (this.format.shouldPrintComment) {
       return this.format.shouldPrintComment(comment.value);
     } else {
-      if (!this.format.compact &&
+      if (!this.format.minified &&
           (comment.value.indexOf("@license") >= 0 || comment.value.indexOf("@preserve") >= 0)) {
         return true;
       } else {

packages/babel-generator/test/fixtures/edgecase/return-with-retainlines-and-compact-option/expected.js

@@ -1,4 +1,4 @@
 function foo(l){
 return (
 
-l)}
+l);}

packages/babel-generator/test/fixtures/minified/options.json

@@ -0,0 +1,3 @@
+{
+  "minified": true
+}