Typescript,'NodeListOf<Element>' is not an array type or a string type

Question

Converting my JS to TS strict mode.

The following syntax looks fine to me but TS is complaining in the for loop on allSubMenus with:

[ts] Type 'NodeListOf<Element>' is not an array type or a string type. 

What am I missing?

function subAct(target:Node){    const allSubMenus : NodeListOf<Element> = document.querySelectorAll('.subMenuItems')     for (const sub of allSubMenus){     sub.classList.remove('active')   }   } 

Answer 1

You need to set the target compiler option to es6 or higher for NodeListOf<T> to be iterable.

Answer 2

According to your typescript target compiler, parsing error can be occured.

I had same problem with HTMLCollectionOf<Element>

To solve this issue,

1. you can change your TS target compiler as @Matt McCutchen mentioned OR
2. make it as any syntax

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const allSubMenus : NodeListOf<Element> = document.querySelectorAll('.subMenuItems')   for (const sub of allSubMenus as any){ // then will pass compiler   sub.classList.remove('active') }   

Note: Declaring "any" makes collection(Objects) as just array and this will affect some typescript features.

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For more information about ECMAScript(ES) history, please have a look the following URL. https://codeburst.io/javascript-wtf-is-es6-es8-es-2017-ecmascript-dca859e4821c