telefunc/dist/utils/hasProp.js

Remote functions. Instead of API.

export { hasProp };
import { isCallable } from './isCallable.js';
// prettier-ignore
// biome-ignore format:
function hasProp(obj, prop, type = 'unknown') {
    const propExists = typeof obj === 'object' && obj !== null && prop in obj;
    if (!propExists) {
        return false;
    }
    if (type === 'unknown') {
        return true;
    }
    const propValue = obj[prop];
    if (type === 'array') {
        return Array.isArray(propValue);
    }
    if (type === 'string[]') {
        return Array.isArray(propValue) && propValue.every((el) => typeof el === 'string');
    }
    if (type === 'function') {
        return isCallable(propValue);
    }
    if (Array.isArray(type)) {
        return typeof propValue === 'string' && type.includes(propValue);
    }
    if (type === 'null') {
        return propValue === null;
    }
    if (type === 'true') {
        return propValue === true;
    }
    return typeof propValue === type;
}
/* Couldn't make it work
function propsIsNotNullish<ObjectType extends Record<PropName, PropType | null | undefined>, PropName extends PropertyKey, PropType>(obj: ObjectType, prop: PropName): obj is ObjectType & Record<PropName, PropType> {
  return obj[prop] !== null && obj[prop] !== undefined
}
*/
// Resources:
//  - https://2ality.com/2020/06/type-guards-assertion-functions-typescript.html
//  - https://www.typescriptlang.org/play?#code/GYVwdgxgLglg9mABDAzgFQJ4AcCmdgAUAbgIYA2IOAXIiWBgDSJTbWIDkARnHGTnewCUNUhRzIUibr35gA3AFgAUKEiwEEzLnzFylGnUbNWNdmBABbTjgBOQkXvGpE5q7cUrw0eElRa8hKL6tPRMLLimKFA2MGAA5vaIQU6SUTHxHqreGn6sOskGocYRHOAA1mBwAO5gickSiOWVNZle6r7oeYGOhUbhbGmxcYgAvKVgFdW1wlI8fHSIAN7KiMiExeIjW+OTNeyIgksrq4g2OFAgNkjRlMcAvsdnF1cb+EmOo9v9Hg9KyhAIKK0GhNKajRAAFgATMplCQUChbFACLltIQSEwzJZrHZBIJ-oCZAA6MhwOIEEj4v6eNQ+WgIpEEAFgAAmMHaIImzTAM3hiJsUEkzLZ7SOShOa0QTIQIp8hyelzAx1WUAAFjZqi4cFVEABRGwamwEdgAQQZArpADESDAyEJlHcgA