refactor(server/utils): strengthen typing

mongoose middleware helper functions are now properly typed

lib/functions.ts

@@ -6,6 +6,7 @@ import { GridFSBucketReadStream } from "mongodb";
 import { stripHtml } from "string-strip-html";
 import { IStory } from "~/models/stories";
 import { ficsHidden } from "./server/ficmas";
+import { PreMiddlewareFunction, Query } from "mongoose";
 
 // const { encode, decode } = iconv;
 
@@ -13,15 +14,22 @@ export function countWords(string: string) {
 	return stripHtml(string).result.split(/W+/).length;
 }
 
-export function populate(field: string) {
+export function populate<T>(
+	field: string,
+	model: string,
+): PreMiddlewareFunction<Query<T, T>> {
 	return function (next: () => any) {
-		this.populate(field);
+		this.populate(field, undefined, model);
 		next();
 	};
 }
-export function populateSelected(field: string, selection: string) {
+export function populateSelected<T>(
+	field: string,
+	model: string,
+	selection: string,
+): PreMiddlewareFunction<Query<T, T>> {
 	return function (next: () => any) {
-		this.populate(field, selection);
+		this.populate(field, selection, model);
 		next();
 	};
 }