Support back to node v4

bin/prettier

@@ -1,4 +1,5 @@
 #!/usr/bin/env node
+"use strict";
 
 const fs = require("fs");
 const minimist = require("minimist");

index.js

@@ -1,3 +1,4 @@
+"use strict";
 const babylon = require("babylon");
 const Printer = require("./src/printer").Printer;
 const flowParser = require("flow-parser");
@@ -26,7 +27,8 @@ var babylonOptions = {
 };
 
 module.exports = {
-  format: function(text, opts={}) {
+  format: function(text, opts) {
+    opts = opts || {};
     let ast;
 
     if(opts.useFlowParser) {

src/pp.js

@@ -1,3 +1,4 @@
+"use strict";
 const assert = require("assert");
 
 function assertDoc(val) {
@@ -156,7 +157,10 @@ function fits(next, restCommands, width) {
       }
     }
 
-    const [ ind, mode, doc ] = cmds.pop();
+    const x = cmds.pop();
+    const ind = x[0];
+    const mode = x[1];
+    const doc = x[2];
 
     if (typeof doc === "string") {
       width -= doc.length;
@@ -213,7 +217,10 @@ function print(w, doc) {
   let out = [];
   let shouldRemeasure = false;
   while (cmds.length !== 0) {
-    const [ ind, mode, doc ] = cmds.pop();
+    const x = cmds.pop();
+    const ind = x[0];
+    const mode = x[1];
+    const doc = x[2];
 
     if (typeof doc === "string") {
       out.push(doc);

src/printer.js

@@ -1,3 +1,4 @@
+"use strict";
 var assert = require("assert");
 var sourceMap = require("source-map");
 var printComments = require("./comments").printComments;

src/util.js

@@ -1,3 +1,4 @@
+"use strict";
 var assert = require("assert");
 var types = require("ast-types");
 var getFieldValue = types.getFieldValue;

tests_config/run_spec.js

@@ -1,3 +1,4 @@
+"use strict";
 const fs = require('fs');
 const jscodefmt = require("../");
 const recast = require("recast");