Preliminary polyfill support in the build. Re: #473

build/build-datebox.js

@@ -21,11 +21,13 @@ const config    = require( "../package.json" ),
 	glob        = require( "glob" ),
 	rimraf      = require( "rimraf" ),
 
+	polyFill    = [ "jqm" ],
 	dontBundle  = [ "jqm" ];
 
 var frameName, inCode, outCodeFull, outCodeMin, outCodeObj,
 	today = new Date(),
 	externalLibsJS = "",
+	polyFillLibsJS = "",
 	dbModeLibsJS = "",
 	buildFiles = [],
 	buildMode = ( typeof process.argv[2] !== "undefined" ) ? process.argv[2] : "latest",
@@ -35,6 +37,7 @@ var frameName, inCode, outCodeFull, outCodeMin, outCodeObj,
 
 	baseObjectJS = fs.readFileSync("src/js/baseObject.js"),
 	externalLibs = glob.sync("src/js/external/*.js"),
+	polyFillLibs = glob.sync("src/js/polyfill/*.js"),
 	frameWorks   = glob.sync("src/js/framework/*.js"),
 	modes        = glob.sync("src/js/modes/*.js"),
 	internalLibs = glob.sync("src/js/lib/*.js"),
@@ -82,6 +85,10 @@ for ( var i = 0, len = externalLibs.length; i < len; i++ ) {
 	externalLibsJS += fs.readFileSync( externalLibs[i] );
 }
 
+for ( var j = 0, lan = polyFillLibs.length; j < lan; j++ ) {
+	polyFillLibsJS += fs.readFileSync( polyFillLibs[j] );
+}
+
 externalLibsJS = UglifyJS.minify( externalLibsJS, {
 	mangle   : false,
 	compress : false,
@@ -91,6 +98,15 @@ externalLibsJS = UglifyJS.minify( externalLibsJS, {
 	}
 } );
 
+polyFillLibsJS = UglifyJS.minify( polyFillLibsJS, {
+	mangle   : false,
+	compress : false,
+	output   : {
+		code     : true,
+		beautify : true
+	}
+} );
+
 for ( i = 0, len = internalLibs.length; i < len; i++ ) {
 	dbModeLibsJS += fs.readFileSync( internalLibs[i] );
 }
@@ -139,6 +155,7 @@ buildFiles.forEach( function( fileObj ) {
 		preamble.long( fileObj.name ) +
 		"\n\n" +
 		( ( dontBundle.includes( fileObj.name ) ) ? "" : externalLibsJS.code ) +
+		( ( polyFill.includes( fileObj.name ) ) ? polyFillLibsJS.code : "" ) +
 		"\n\n" +
 		outCodeObj.code;
 

src/js/polyfill/obj.assign.js

@@ -0,0 +1,36 @@
+/*! This contains a polyfill for Object.assign.  Currently only used for jQM builds. */
+
+/* eslint-disable one-var, no-unused-vars */
+
+if ( typeof Object.assign != "function" ) {
+	// Must be writable: true, enumerable: false, configurable: true
+	Object.defineProperty( Object, "assign", {
+		value : function assign( target, varArgs ) { // .length of function is 2
+			"use strict";
+			if ( target == null ) { // TypeError if undefined or null
+				throw new TypeError( "Cannot convert undefined or null to object" );
+			}
+
+			var to = Object(target);
+
+			for ( var index = 1; index < arguments.length; index++ ) {
+				var nextSource = arguments[index];
+
+				if ( nextSource != null ) { // Skip over if undefined or null
+					for ( var nextKey in nextSource ) {
+						// Avoid bugs when hasOwnProperty is shadowed
+						if ( Object.prototype.hasOwnProperty.call( nextSource, nextKey ) ) {
+							to[nextKey] = nextSource[nextKey];
+						}
+					}
+				}
+			}
+
+			return to;
+		},
+		writable : true,
+		configurable : true
+	});
+}
+
+/* eslint-enable one-var, no-unused-vars */