Added documentation and updated gulpfile.js to produce JSDocs.

gulpfile.js

@@ -2,6 +2,7 @@ const gulp = require('gulp');
 const concat = require('gulp-concat');
 const minifyCSS = require('gulp-minify-css');
 const replace = require('gulp-replace');
+const { exec } = require('child_process');
 
 gulp.task('style', () => {
   return gulp.src('dist/drawflow.min.css')
@@ -17,8 +18,23 @@ gulp.task('css', () => {
   .pipe(gulp.dest('dist/'))
 });
 
+gulp.task('docs', (done) => {
+  exec('npx jsdoc -c jsdoc.json', (err, stdout, stderr) => {
+    if (err) {
+      console.error(`Error generating JSDoc: ${err}`);
+      return done(err);
+    }
+    console.log(`JSDoc output: ${stdout}`);
+    if (stderr) {
+      console.error(`JSDoc errors: ${stderr}`);
+    }
+    done();
+  });
+});
+
 gulp.task('default', gulp.series(
     'css', 
-    'style'
+    'style',
+    'docs'
   )
 );

jsdoc.json

@@ -0,0 +1,25 @@
+{
+  "tags": {
+    "allowUnknownTags": true,
+    "dictionaries": ["jsdoc", "closure"]
+  },
+  "source": {
+    "include": ["src/drawflow.js"],
+    "includePattern": ".+\\.js(doc|x)?$",
+    "excludePattern": "(^|\\/|\\\\)_"
+  },
+  "plugins": ["plugins/markdown"],
+  "templates": {
+    "cleverLinks": false,
+    "monospaceLinks": false,
+    "default": {
+      "outputSourceFiles": true
+    }
+  },
+  "opts": {
+    "destination": "./docs/jsdoc",
+    "recurse": true,
+    "readme": "README.md",
+    "template": "node_modules/jsdoc/templates/default"
+  }
+}

package.json

@@ -36,6 +36,7 @@
     "gulp-concat": "^2.6.1",
     "gulp-minify-css": "^1.2.4",
     "gulp-replace": "^1.0.0",
+    "jsdoc": "^4.0.4",
     "mini-css-extract-plugin": "^0.9.0",
     "webpack-cli": "^3.3.11",
     "webpack-dev-server": "^3.11.2",