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'includes' does not exists on type 'string[]' in TypeScript [duplicate]

0

This question already has an answer here:

• 
  Property 'includes' does not exist on type 'string[]'
  
  2 answers
  
  

From this question and the accepted answer, I know that there is an methode to check if an array includes an object in JavaScript by using this line of code:

> ['joe', 'jane', 'mary'].includes('jane');
true 

However if I use the same code in TypeScript I've got this error:

Property includes does not exist on type string[].

1. Why gives the compiler this error? I'm expecting that everything that is available in JS, is available in TS.


2. How could I solve this error without changing the code? It must be working on ES5.

arrays typescript ecma

share|improve this question

edited Mar 6 at 14:00

H. Pauwelyn

asked Mar 6 at 13:52

H. PauwelynH. Pauwelyn

5,856184987

marked as duplicate by H. Pauwelyn, Community♦ Mar 6 at 14:04

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Baboo_: It's not a duplicate because my question goes about TypeScript and not about JavaScript like the link you provided!
  
  – H. Pauwelyn
  Mar 6 at 13:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I missed copied, the link you provided is the one I wanted to provide ;)
  
  – Baboo_
  Mar 6 at 14:04
  

  
  
  
  

add a comment | 

0

This question already has an answer here:

• 
  Property 'includes' does not exist on type 'string[]'
  
  2 answers
  
  

From this question and the accepted answer, I know that there is an methode to check if an array includes an object in JavaScript by using this line of code:

> ['joe', 'jane', 'mary'].includes('jane');
true 

However if I use the same code in TypeScript I've got this error:

Property includes does not exist on type string[].

1. Why gives the compiler this error? I'm expecting that everything that is available in JS, is available in TS.


2. How could I solve this error without changing the code? It must be working on ES5.

arrays typescript ecma

share|improve this question

edited Mar 6 at 14:00

H. Pauwelyn

asked Mar 6 at 13:52

H. PauwelynH. Pauwelyn

5,856184987

marked as duplicate by H. Pauwelyn, Community♦ Mar 6 at 14:04

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Baboo_: It's not a duplicate because my question goes about TypeScript and not about JavaScript like the link you provided!
  
  – H. Pauwelyn
  Mar 6 at 13:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I missed copied, the link you provided is the one I wanted to provide ;)
  
  – Baboo_
  Mar 6 at 14:04
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  Property 'includes' does not exist on type 'string[]'
  
  2 answers
  
  

From this question and the accepted answer, I know that there is an methode to check if an array includes an object in JavaScript by using this line of code:

> ['joe', 'jane', 'mary'].includes('jane');
true 

However if I use the same code in TypeScript I've got this error:

Property includes does not exist on type string[].

1. Why gives the compiler this error? I'm expecting that everything that is available in JS, is available in TS.


2. How could I solve this error without changing the code? It must be working on ES5.

arrays typescript ecma

share|improve this question

edited Mar 6 at 14:00

H. Pauwelyn

asked Mar 6 at 13:52

H. PauwelynH. Pauwelyn

5,856184987

share|improve this question

edited Mar 6 at 14:00

H. Pauwelyn

asked Mar 6 at 13:52

H. PauwelynH. Pauwelyn

5,856184987

share|improve this question

edited Mar 6 at 14:00

H. Pauwelyn

asked Mar 6 at 13:52

H. PauwelynH. Pauwelyn

5,856184987

asked Mar 6 at 13:52

H. PauwelynH. Pauwelyn

5,856184987

asked Mar 6 at 13:52

H. PauwelynH. Pauwelyn

5,856184987

1 Answer
1

active

oldest

votes

1

Includes is defined in the lib.es2016.array.include.d.ts since it is part of the es2016 standard. You can include this lib in your tsconfig but you have to provide your own polyfil for the method:

 "compilerOptions": 
 "target": "es5",
 "lib": [
 "dom",
 "scripthost",
 "es5",
 "es2016.array.include"
 ]
 

You can also provide the polyfill by assigning Array.prototype.include if your runtime does not provide this method on array (you can get a polyfill from here for example)

share|improve this answer

answered Mar 6 at 13:57

Titian Cernicova-DragomirTitian Cernicova-Dragomir

69.3k34765

add a comment | 

1

Includes is defined in the lib.es2016.array.include.d.ts since it is part of the es2016 standard. You can include this lib in your tsconfig but you have to provide your own polyfil for the method:

 "compilerOptions": 
 "target": "es5",
 "lib": [
 "dom",
 "scripthost",
 "es5",
 "es2016.array.include"
 ]
 

You can also provide the polyfill by assigning Array.prototype.include if your runtime does not provide this method on array (you can get a polyfill from here for example)

share|improve this answer

answered Mar 6 at 13:57

Titian Cernicova-DragomirTitian Cernicova-Dragomir

69.3k34765

add a comment | 

1

Includes is defined in the lib.es2016.array.include.d.ts since it is part of the es2016 standard. You can include this lib in your tsconfig but you have to provide your own polyfil for the method:

 "compilerOptions": 
 "target": "es5",
 "lib": [
 "dom",
 "scripthost",
 "es5",
 "es2016.array.include"
 ]
 

You can also provide the polyfill by assigning Array.prototype.include if your runtime does not provide this method on array (you can get a polyfill from here for example)

share|improve this answer

answered Mar 6 at 13:57

Titian Cernicova-DragomirTitian Cernicova-Dragomir

69.3k34765

add a comment | 

Includes is defined in the lib.es2016.array.include.d.ts since it is part of the es2016 standard. You can include this lib in your tsconfig but you have to provide your own polyfil for the method:

 "compilerOptions": 
 "target": "es5",
 "lib": [
 "dom",
 "scripthost",
 "es5",
 "es2016.array.include"
 ]
 

You can also provide the polyfill by assigning Array.prototype.include if your runtime does not provide this method on array (you can get a polyfill from here for example)

share|improve this answer

answered Mar 6 at 13:57

Titian Cernicova-DragomirTitian Cernicova-Dragomir

69.3k34765

 "compilerOptions": 
 "target": "es5",
 "lib": [
 "dom",
 "scripthost",
 "es5",
 "es2016.array.include"
 ]
 

share|improve this answer

answered Mar 6 at 13:57

Titian Cernicova-DragomirTitian Cernicova-Dragomir

69.3k34765

answered Mar 6 at 13:57

Titian Cernicova-DragomirTitian Cernicova-Dragomir

69.3k34765

answered Mar 6 at 13:57

Titian Cernicova-DragomirTitian Cernicova-Dragomir

69.3k34765