@@ -72,6 +72,54 @@ describe('updateIn', () => {
7272 ) ;
7373 } ) ;
7474
75+ it ( 'handle ArrayLike objects that are nor Array not immutable Collection' , ( ) => {
76+ class CustomArrayLike < T > implements ArrayLike < T > {
77+ readonly length : number ;
78+ [ n : number ] : T ;
79+
80+ constructor ( ...values : Array < T > ) {
81+ this . length = values . length ;
82+
83+ for ( let i = 0 ; i < values . length ; i ++ ) {
84+ this [ i ] = values [ i ] ;
85+ }
86+ }
87+
88+ // Define other methods if needed, but do not include the `slice` method
89+ // For example, you can define a method to set values
90+ set ( index : number , value : T ) : void {
91+ if ( index < 0 || index >= this . length ) {
92+ throw new RangeError ( 'Index out of bounds' ) ;
93+ }
94+
95+ this [ index ] = value ;
96+ }
97+
98+ // Define a method to get values
99+ get ( index : number ) : T {
100+ if ( index < 0 || index >= this . length ) {
101+ throw new RangeError ( 'Index out of bounds' ) ;
102+ }
103+
104+ return this [ index ] ;
105+ }
106+ }
107+
108+ // create an ArrayLike
109+ const customArray = new CustomArrayLike < number > ( 10 , 20 ) ;
110+
111+ // code that works perfectly
112+ expect (
113+ // @ts -expect-error -- `updateIn` keypath type should be `OrderedCollection<K> | ArrayLike<K>;
114+ updateIn ( { 10 : { 20 : 'a' } } , customArray , ( v ) => `${ v . toUpperCase ( ) } )
115+ ) . toEqual ( { 10 : { 20 : 'A' } } ) ;
116+
117+ expect ( ( ) =>
118+ // @ts -expect-error -- `updateIn` keypath type should be `OrderedCollection<K> | ArrayLike<K>;
119+ updateIn ( { 10 : 'a' } , customArray , ( v ) => `${ v . toUpperCase ( ) } )
120+ ) . toThrow ( 'Cannot update within non-data-structure value in path [10]: a' ) ;
121+ } ) ;
122+
75123 it ( 'identity with notSetValue is still identity' , ( ) => {
76124 const m = Map ( { a : { b : { c : 10 } } } ) ;
77125 expect ( m . updateIn ( [ 'x' ] , 100 , ( id ) => id ) ) . toEqual ( m ) ;
@@ -159,7 +207,9 @@ describe('updateIn', () => {
159207 const m = fromJS ( { a : { b : { c : 10 } } } ) ;
160208 expect ( ( ) => {
161209 m . updateIn ( [ 'a' , 'b' , 'c' , 'd' ] , ( ) => 20 ) . toJS ( ) ;
162- } ) . toThrow ( ) ;
210+ } ) . toThrow (
211+ 'Cannot update within non-data-structure value in path ["a","b","c"]: 10'
212+ ) ;
163213 } ) ;
164214
165215 it ( 'update with notSetValue when non-existing key' , ( ) => {
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