When using thedelete operator with an array value, the array'slength property is not affected,but the element at the specified index is removed and leaves an empty slot in the array.This is likely to lead to unexpected behavior. As mentioned in theMDN documentation,the recommended way to remove an element from an array is by using theArray#splice method.

exportdefault tseslint.config({
rules:{
"@typescript-eslint/no-array-delete":"error"
}
});

module.exports={
"rules":{
"@typescript-eslint/no-array-delete":"error"
}
};

Examples​

declareconst arr:number[];

delete arr[0];

declareconst arr:number[];

arr.splice(0,1);

Options​

This rule is not configurable.

When Not To Use It​

When you want to allow the delete operator with array expressions.

Type checked lint rules are more powerful than traditional lint rules, but also require configuringtype checked linting.

SeeTroubleshooting > Linting with Type Information > Performance if you experience performance degradations after enabling type checked rules.

Resources​

• Rule source
• Test source