more stuff

node_modules/node-fetch/src/utils/is.js

@@ -0,0 +1,87 @@
+/**
+ * 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;
+};