fix(types): use method syntax for Checksum fn

Author: trivikr

packages/types/src/checksum.ts

@@ -21,12 +21,12 @@ export interface Checksum {
    * Creates a new checksum object that contains a deep copy of the internal
    * state of the current `Checksum` object.
    */
-  copy?: () => Checksum;
+  copy?(): Checksum;
 
   /**
    * Returns the digest of all of the data passed.
    */
-  digest: () => Promise<Uint8Array>;
+  digest(): Promise<Uint8Array>;
 
   /**
    * Allows marking a checksum for checksums that support the ability
@@ -35,12 +35,12 @@ export interface Checksum {
    * @param {number} readLimit - The maximum limit of bytes that can be read
    *   before the mark position becomes invalid.
    */
-  mark?: (readLimit: number) => void;
+  mark?(readLimit: number): void;
 
   /**
    * Resets the checksum to its initial value.
    */
-  reset: () => void;
+  reset(): void;
 
   /**
    * Adds a chunk of data for which checksum needs to be computed.