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/**
* Is.js
*
* Object type checks.
*/
const NAME = Symbol.toStringTag;
/**
* Check if `obj` is a URLSearchParams object
* ref: https://github.com/node-fetch/node-fetch/issues/296#issuecomment-307598143
* @param {*} object - Object to check for
* @return {boolean}
*/
export const isURLSearchParameters = object => {
return (
typeof object === 'object' &&
typeof object.append === 'function' &&
typeof object.delete === 'function' &&
typeof object.get === 'function' &&
typeof object.getAll === 'function' &&
typeof object.has === 'function' &&
typeof object.set === 'function' &&
typeof object.sort === 'function' &&
object[NAME] === 'URLSearchParams'
);
};
/**
* Check if `object` is a W3C `Blob` object (which `File` inherits from)
* @param {*} object - Object to check for
* @return {boolean}
*/
export const isBlob = object => {
return (
object &&
typeof object === 'object' &&
typeof object.arrayBuffer === 'function' &&
typeof object.type === 'string' &&
typeof object.stream === 'function' &&
typeof object.constructor === 'function' &&
/^(Blob|File)$/.test(object[NAME])
);
};
/**
* Check if `obj` is an instance of AbortSignal.
* @param {*} object - Object to check for
* @return {boolean}
*/
export const isAbortSignal = object => {
return (
typeof object === 'object' && (
object[NAME] === 'AbortSignal' ||
object[NAME] === 'EventTarget'
)
);
};
/**
* isDomainOrSubdomain reports whether sub is a subdomain (or exact match) of
* the parent domain.
*
* Both domains must already be in canonical form.
* @param {string|URL} original
* @param {string|URL} destination
*/
export const isDomainOrSubdomain = (destination, original) => {
const orig = new URL(original).hostname;
const dest = new URL(destination).hostname;
return orig === dest || orig.endsWith(`.${dest}`);
};
/**
* isSameProtocol reports whether the two provided URLs use the same protocol.
*
* Both domains must already be in canonical form.
* @param {string|URL} original
* @param {string|URL} destination
*/
export const isSameProtocol = (destination, original) => {
const orig = new URL(original).protocol;
const dest = new URL(destination).protocol;
return orig === dest;
};