Use undefined instead of false

README.md

@@ -140,7 +140,7 @@ easyMDE.value('New input for **EasyMDE**');
   - table
 - **lineWrapping**: If set to `false`, disable line wrapping. Defaults to `true`.
 - **minHeight**: Sets the minimum height for the composition area, before it starts auto-growing. Should be a string containing a valid CSS value like `"500px"`. Defaults to `"300px"`.
-- **maxHeight**: Sets fixed height for the composition area. `minHeight` option will be ignored. Should be a string containing a valid CSS value like `"500px"`. Defaults to `false`.
+- **maxHeight**: Sets fixed height for the composition area. `minHeight` option will be ignored. Should be a string containing a valid CSS value like `"500px"`. Defaults to `undefined`.
 - **onToggleFullScreen**: A function that gets called when the editor's full screen mode is toggled. The function will be passed a boolean as parameter, `true` when the editor is currently going into full screen mode, or `false`.
 - **parsingConfig**: Adjust settings for parsing the Markdown during editing (not previewing).
   - **allowAtxHeaderWithoutSpace**: If set to `true`, will render headers without a space after the `#`. Defaults to `false`.

src/js/easymde.js

@@ -342,7 +342,7 @@ function toggleFullScreen(editor) {
     }
 
     // Remove or set maxHeight
-    if (editor.options.maxHeight !== false) {
+    if (typeof editor.options.maxHeight !== 'undefined') {
         if (cm.getOption('fullScreen')) {
             cm.getScrollerElement().style.removeProperty('height');
             sidebyside.style.removeProperty('height');
@@ -1719,7 +1719,7 @@ function EasyMDE(options) {
     options.shortcuts = extend({}, shortcuts, options.shortcuts || {});
 
     options.minHeight = options.minHeight || '300px';
-    options.maxHeight = options.maxHeight || false;
+    options.maxHeight = options.maxHeight || undefined;
 
     options.errorCallback = options.errorCallback || function (errorMessage) {
         alert(errorMessage);
@@ -2007,7 +2007,7 @@ EasyMDE.prototype.render = function (el) {
 
     this.codemirror.getScrollerElement().style.minHeight = options.minHeight;
 
-    if (options.maxHeight !== false) {
+    if (typeof options.maxHeight !== 'undefined') {
         this.codemirror.getScrollerElement().style.height = options.maxHeight;
     }
 
@@ -2328,7 +2328,7 @@ EasyMDE.prototype.createSideBySide = function () {
         wrapper.parentNode.insertBefore(preview, wrapper.nextSibling);
     }
 
-    if (this.options.maxHeight !== false) {
+    if (typeof this.options.maxHeight !== 'undefined') {
         this.setPreviewMaxHeight();
     }
 

types/easymde-test.ts

@@ -165,7 +165,6 @@ const editorImagesCustom = new EasyMDE({
 
 new EasyMDE({
     sideBySideFullscreen: true,
-    maxHeight: false,
     autosave: {
         enabled: true,
         delay: 2000,

types/easymde.d.ts

@@ -172,7 +172,7 @@ declare namespace EasyMDE {
         insertTexts?: InsertTextOptions;
         lineWrapping?: boolean;
         minHeight?: string;
-        maxHeight?: boolean | string;
+        maxHeight?: string;
         parsingConfig?: ParsingOptions;
         placeholder?: string;
         previewClass?: string | ReadonlyArray<string>;