fix(types): correct TypeCast's Next callback to return unknown (#3129)

* fix(types): correctly type Next as unknown

Fixes typeCast Next type appears to be incorrect #3122

* Revert fixed type change in txt files

* Revert txt to 5c22cf0^ for weird EOF issue

Author: bbugh

typings/mysql/lib/Connection.d.ts

@@ -183,7 +183,7 @@ export interface ConnectionOptions {
    *
    * You can also specify a function to do the type casting yourself:
    * ```ts
-   * (field: Field, next: () => void) => {
+   * (field: Field, next: () => unknown) => {
    *   return next();
    * }
    * ```

typings/mysql/lib/parsers/typeCast.d.ts

@@ -49,6 +49,6 @@ export type Field = Type & {
   geometry: () => Geometry | Geometry[] | null;
 };
 
-export type Next = () => void;
+export type Next = () => unknown;
 
 export type TypeCast = ((field: Field, next: Next) => any) | boolean;

typings/mysql/lib/protocol/sequences/Query.d.ts

@@ -44,7 +44,7 @@ export interface QueryOptions {
    *
    * You can also specify a function to do the type casting yourself:
    * ```ts
-   * (field: Field, next: () => void) => {
+   * (field: Field, next: () => unknown) => {
    *   return next();
    * }
    * ```