Various fixes for typings.

Author: octet-stream

lib/FileLike.ts

@@ -2,27 +2,27 @@ export interface FileLike {
   /**
    * Name of the file referenced by the File object.
    */
-  name: string
+  readonly name: string
 
   /**
    * Returns the media type ([`MIME`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types)) of the file represented by a `File` object.
    */
-  type: string
+  readonly type: string
 
   /**
    * Size of the file parts in bytes
    */
-  size: number
+  readonly size: number
 
   /**
    * The last modified date of the file as the number of milliseconds since the Unix epoch (January 1, 1970 at midnight). Files without a known last modified date return the current date.
    */
-  lastModified: number
+  readonly lastModified: number
 
   /**
    * Returns a [`ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) which upon reading returns the data contained within the [`File`](https://developer.mozilla.org/en-US/docs/Web/API/File).
    */
   stream(): AsyncIterable<Uint8Array>
 
-  [Symbol.toStringTag]: string
+  readonly [Symbol.toStringTag]: string
 }

lib/FormDataLike.ts

@@ -42,5 +42,5 @@ export interface FormDataLike {
    */
   [Symbol.iterator](): Generator<[string, FormDataEntryValue]>
 
-  [Symbol.toStringTag]: string
+  readonly [Symbol.toStringTag]: string
 }