[enhance] Improve typescript types with generics (#365)

index.d.ts

@@ -1,59 +1,62 @@
 declare namespace schema {
-  export type StrategyFunction = (value: any, parent: any, key: string) => any;
+  export type StrategyFunction<T> = (value: any, parent: any, key: string) => T;
   export type SchemaFunction = (value: any, parent: any, key: string) => string;
   export type MergeFunction = (entityA: any, entityB: any) => any;
 
-  export class Array {
-    constructor(definition: Schema, schemaAttribute?: string | SchemaFunction)
+  export class Array<T = any> {
+    constructor(definition: Schema<T>, schemaAttribute?: string | SchemaFunction)
     define(definition: Schema): void
   }
 
-  export interface EntityOptions {
+  export interface EntityOptions<T = any> {
     idAttribute?: string | SchemaFunction
     mergeStrategy?: MergeFunction
-    processStrategy?: StrategyFunction
+    processStrategy?: StrategyFunction<T>
   }
 
-  export class Entity {
-    constructor(key: string | symbol, definition?: Schema, options?: EntityOptions)
+  export class Entity<T = any> {
+    constructor(key: string | symbol, definition?: Schema, options?: EntityOptions<T>)
     define(definition: Schema): void
     key: string
+    getId: SchemaFunction
+    _processStrategy: StrategyFunction<T>
   }
 
-  export class Object {
-    constructor(definition: {[key: string]: Schema})
+  export class Object<T = any> {
+    constructor(definition: {[key: string]: Schema<T>})
     define(definition: Schema): void
   }
 
-  export class Union {
-    constructor(definition: Schema, schemaAttribute?: string | SchemaFunction)
+  export class Union<T = any> {
+    constructor(definition: Schema<T>, schemaAttribute?: string | SchemaFunction)
     define(definition: Schema): void
   }
 
-  export class Values {
-    constructor(definition: Schema, schemaAttribute?: string | SchemaFunction)
+  export class Values<T = any> {
+    constructor(definition: Schema<T>, schemaAttribute?: string | SchemaFunction)
     define(definition: Schema): void
   }
 }
 
-export type Schema =
-  schema.Array |
-  schema.Entity |
-  schema.Object |
-  schema.Union |
-  schema.Values |
-  schema.Array[] |
-  schema.Entity[] |
-  schema.Object[] |
-  schema.Union[] |
-  schema.Values[] |
-  {[key: string]: Schema | Schema[]};
+export type Schema<T = any> =
+  | schema.Entity<T>
+  | schema.Object<T>
+  | schema.Union<T>
+  | schema.Values<T>
+  | SchemaObject<T>
+  | SchemaArray<T>;
+
+export interface SchemaObject<T> {
+  [key: string]: Schema<T>
+}
+
+export interface SchemaArray<T> extends Array<Schema<T>> {}
 
 export type NormalizedSchema<E, R> = { entities: E, result: R };
 
-export function normalize<E = any, R = any>(
+export function normalize<T = any, E = { [key:string]: { [key:string]: T }}, R = any>(
   data: any,
-  schema: Schema
+  schema: Schema<T>
 ): NormalizedSchema<E, R>;
 
 export function denormalize(