- Breaking change: Rename config file to svgedit-config-iife.js (or for the module version, svgedit-config-es.js);

also expect one directory higher; incorporates #207 (@iuyiuy)
- Breaking change: Separate `extIconsPath` from `extPath` (not copying over icons)
- Breaking change: Don't reference `custom.css` in HTML; can instead be referenced in JavaScript through
    the config file (provided in `svgedit-config-sample-iife.js`/`svgedit-config-sample-es.js` as `svgedit-custom.css` for
    better namespacing); incorporates #207 (@iuyiuy)
- Breaking change: Remove minified jgraduate/spinbtn files (minified within Rollup routine)
- Fix: Zoom when scrolled; incorporates #169 (@AndrolGenhald), adapting for conventions; also allow avoidance when shift key pressed
- Fix: Update Atom feed reference in HTML
- Fixes related to recent commits: Some path and method name fixes needed, function order, missing methods, variable scope declaration, no need for DOMContentLoaded listeners in modules, switch back to non-default export, avoid trimming nullish, deal with mock tests, fix `math.matrixMultiply`, use jquery-svg where needed for array/SVG attributes; add babel-polyfill and defer script to imagelib; other misc. fixes
- Enhancement: Move config-sample.js out of `editor` directory
- Enhancement: For `callback`-style extensions, also provide config object; add following
   to that object: buildCanvgCallback, canvg, decode64, encode64, executeAfterLoads, getTypeMap, isChrome, ieIE, NS, text2xml
- Enhancement: Complete ES6 modules work (extensions, locales, tests), along with Babel;
    make Node build routine for converting modular source to non-modular,
    use `loadStylesheets` for modular stylehsheet defining (but parallel loading);
- Enhancement: Add `stylesheets` config for modular but parallel stylesheet loading with `@default` option for simple inclusion/exclusion of defaults (if not going with default).
- Refactoring: Clean up `svg-editor.html`: consistent indents; avoid extra lbs, avoid long lines
- Refactoring: Avoid embedded API adding inline JavaScript listener
- Refactoring: Move layers and context code to `draw.js`
- Refactoring: Move `pathActions` from `svgcanvas.js` (though preserve aliases to these methods on `canvas`) and `convertPath` from `svgutils.js` to `path.js`
- Refactoring: Move `getStrokedBBox` from `svgcanvas.js` (while keeping an alias) to `svgutils.js` (as `getStrokedBBoxDefaultVisible` to avoid conflict with existing)
- Docs: Remove "dependencies" comments in code except where summarizing role of jQuery or a non-obvious dependency
- Refactoring/Linting: Enfore `no-extra-semi` and `quote-props` rules
- Refactoring: Further avoidance of quotes on properties (as possible)
- Refactoring: Use `class` in place of functions where intended as classes
- Refactoring: Consistency and granularity in extensions imports
- Testing: Update QUnit to 2.6.1 (node_modules) and Sinon to 5.0.8 (and add sinon-test at 2.1.3) and enforce eslint-plugin-qunit linting rules; update custom extensions
- Testing: Add node-static for automating (and accessing out-of-directory contents)
- Testing: Avoid HTML attributes for styling
- Testing: Add npm `test` script
- Testing: Comment out unused jQuery SVG test
- Testing: Add test1 and svgutils_performance_test to all tests page
- Testing: Due apparently to Path having not been a formal class, the test was calling it without `new`; refactored now with sufficient mock data to take into account it is a class
- npm: Update devDeps
- npm: Add html modules and config build to test script

dist/extensions/ext-helloworld.js

@@ -0,0 +1,83 @@
+(function () {
+  'use strict';
+
+  /* globals jQuery */
+  /*
+   * ext-helloworld.js
+   *
+   * Licensed under the MIT License
+   *
+   * Copyright(c) 2010 Alexis Deveria
+   *
+   */
+
+  /*
+    This is a very basic SVG-Edit extension. It adds a "Hello World" button in
+    the left panel. Clicking on the button, and then the canvas will show the
+    user the point on the canvas that was clicked on.
+  */
+
+  svgEditor.addExtension('Hello World', function () {
+    var $ = jQuery;
+    var svgCanvas = svgEditor.canvas;
+    return {
+      name: 'Hello World',
+      // For more notes on how to make an icon file, see the source of
+      // the helloworld-icon.xml
+      svgicons: svgEditor.curConfig.extIconsPath + 'helloworld-icon.xml',
+
+      // Multiple buttons can be added in this array
+      buttons: [{
+        // Must match the icon ID in helloworld-icon.xml
+        id: 'hello_world',
+
+        // This indicates that the button will be added to the "mode"
+        // button panel on the left side
+        type: 'mode',
+
+        // Tooltip text
+        title: "Say 'Hello World'",
+
+        // Events
+        events: {
+          click: function click() {
+            // The action taken when the button is clicked on.
+            // For "mode" buttons, any other button will
+            // automatically be de-pressed.
+            svgCanvas.setMode('hello_world');
+          }
+        }
+      }],
+      // This is triggered when the main mouse button is pressed down
+      // on the editor canvas (not the tool panels)
+      mouseDown: function mouseDown() {
+        // Check the mode on mousedown
+        if (svgCanvas.getMode() === 'hello_world') {
+          // The returned object must include "started" with
+          // a value of true in order for mouseUp to be triggered
+          return { started: true };
+        }
+      },
+
+
+      // This is triggered from anywhere, but "started" must have been set
+      // to true (see above). Note that "opts" is an object with event info
+      mouseUp: function mouseUp(opts) {
+        // Check the mode on mouseup
+        if (svgCanvas.getMode() === 'hello_world') {
+          var zoom = svgCanvas.getZoom();
+
+          // Get the actual coordinate by dividing by the zoom value
+          var x = opts.mouse_x / zoom;
+          var y = opts.mouse_y / zoom;
+
+          var text = 'Hello World!\n\nYou clicked here: ' + x + ', ' + y;
+
+          // Show the text using the custom alert function
+          $.alert(text);
+        }
+      }
+    };
+  });
+
+}());