Fix default options

Fix deep-assign utility
Fixes regression in #123

packages/vanilla/src/index.ts

@@ -61,7 +61,7 @@ export default class SelectionArea extends EventTarget<SelectionEvents> {
             behaviour: {
                 overlap: 'invert',
                 intersect: 'touch',
-                startThreshold: 10,
+                startThreshold: {x: 10, y: 10},
                 scrolling: {
                     speedDivider: 10,
                     manualSpeed: 750

packages/vanilla/src/types.ts

@@ -86,7 +86,7 @@ export interface SelectionOptions {
     features: Features;
 }
 
-export type PartialSelectionOptions = Partial<SelectionOptions> & {
+export type PartialSelectionOptions = Partial<Omit<SelectionOptions, 'behaviour' | 'features'>> & {
     behaviour?: Partial<Behaviour>;
     features?: Partial<Features>;
 }

packages/vanilla/src/utils/deep-assign.ts

@@ -1,17 +1,16 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 /* eslint-disable @typescript-eslint/explicit-module-boundary-types */
-export const deepAssign = <O>(target: O, source: any): O => {
-    const result: Record<any, unknown> = {};
-
-    for (const [key, value] of Object.entries(target)) {
+export const deepAssign = (target: any, source: any): any => {
+    for (const [key, value] of Object.entries(source)) {
 
         // Use the default value if there's no value specified
-        result[key] = source[key] === undefined ? target[key as keyof O] :
+        target[key] = value === undefined ? target[key as keyof O] :
 
             // Check if it's a nested object and merge if required
             (typeof value === 'object' && value !== null && !Array.isArray(value)) ?
-                deepAssign(value as O, source[key] as Partial<O>) : source[key];
+                deepAssign(target[key], source[key] as Partial<O>) :
+                source[key];
     }
 
-    return result as O;
+    return target;
 };