Almost MVP

shared/model.ts

@@ -4,8 +4,8 @@
 
 export type MetadataProps = 'id' | 'createdAt'
 
-type Opaque<T, K, L extends string = 'opaque'> = T & { _: K; __: L }
-type Id<T> = Opaque<string, T, 'id'>
+export type Opaque<T, K, L extends string = 'opaque'> = T & { _: K; __: L }
+export type Id<T> = Opaque<string, T, 'id'>
 
 //
 // Users
@@ -20,6 +20,7 @@ export type UserId = Id<User>
 
 export type User = {
     id: UserId
+
     role: UserRole
 }
 
@@ -39,9 +40,10 @@ export type ProblemId = Id<Problem>
 
 export type Problem = {
     id: ProblemId
+    createdAt: string
+
     content: string
     createdBy: UserId
-    createdAt: string
 }
 
 //
@@ -50,12 +52,19 @@ export type Problem = {
 
 export type SolutionStatus = 'pending' | 'correct' | 'wrong'
 
-export type SolutionId = string
+export type SolutionId = Id<Solution>
 
 export type Solution = {
     id: SolutionId
+    createdAt: string
+
     sentBy: UserId
     forProblem: ProblemId
     content: string
     status: SolutionStatus
+
+    /**
+     * The _visibility status_ only applies when `status` is not "pending"
+     */
+    visible: boolean
 }

shared/utils.ts

@@ -0,0 +1,6 @@
+export function validateObjectKeys<K extends string>(obj: any, keys: K[]): boolean {
+    const keySet = new Set(keys)
+
+    // @ts-ignore
+    return Object.keys(obj).every(key => keySet.has(key))
+}