Supports omitting multiple properties, at the top level only

ES6RestAndDeleteOmit.ts

const omit = (originalObject = {}, keysToOmit = []) => {    
    const clonedObject = { ...originalObject };      
    
    for (const path of keysToOmit) {        
        delete clonedObject[path]   
    }     
  
    return clonedObject;
}

const objectFromFrontend = {
  _id: 5,
  data: {
    some: 1,
    useful: 2,
    data: 3
  }
}

const objectToInsertIntoDB = omit(objectFromFrontend, ['_id', 'data.some']);

console.log(objectToInsertIntoDB)
/**
* {
*   data: {
*    some: 1, // NOTE: this property has NOT been omitted, as this function does not support flattened paths
*    useful: 2,
*    data: 3
*  }
* }
*/

console.log(objectFromFrontend)
/**
* {
*   _id: 5,
*   data: {
*    some: 1,
*    useful: 2,
*    data: 3
*  }
* }
*/