feat: expose content-type parser

index.d.ts

@@ -23,6 +23,7 @@ export * from './types/filereader'
 export * from './types/formdata'
 export * from './types/diagnostics-channel'
 export * from './types/websocket'
+export * from './types/content-type'
 export { Interceptable } from './types/mock-interceptor'
 
 export { Dispatcher, BalancedPool, Pool, Client, buildConnector, errors, Agent, request, stream, pipeline, connect, upgrade, setGlobalDispatcher, getGlobalDispatcher, setGlobalOrigin, getGlobalOrigin, MockClient, MockPool, MockAgent, mockErrors, ProxyAgent, RedirectHandler, DecoratorHandler }

index.js

@@ -134,6 +134,11 @@ if (nodeMajor >= 16) {
   module.exports.getCookies = getCookies
   module.exports.getSetCookies = getSetCookies
   module.exports.setCookie = setCookie
+
+  const { parseMIMEType, serializeAMimeType } = require('./lib/fetch/dataURL')
+
+  module.exports.parseMIMEType = parseMIMEType
+  module.exports.serializeAMimeType = serializeAMimeType
 }
 
 if (nodeMajor >= 18 && hasCrypto) {

types/content-type.d.ts

@@ -0,0 +1,21 @@
+/// <reference types="node" />
+
+interface MIMEType {
+  type: string
+  subtype: string
+  parameters: Map<string, string>
+  essence: string
+}
+
+/**
+ * Parse a string to a {@link MIMEType} object. Returns `failure` if the string
+ * couldn't be parsed.
+ * @see https://mimesniff.spec.whatwg.org/#parse-a-mime-type
+ */
+export function parseMIMEType (input: string): 'failure' | MIMEType
+
+/**
+ * Convert a MIMEType object to a string.
+ * @see https://mimesniff.spec.whatwg.org/#serialize-a-mime-type
+ */
+export function serializeAMimeType (mimeType: MIMEType): string