Fix types

Author: jdesrosiers

lib/instance.d.ts

@@ -6,24 +6,24 @@ export const fromJs: (value: Json, uri?: string) => JsonNode;
 export const cons: (
   baseUri: string,
   pointer: string,
-  value: Json,
+  value: Json | undefined,
   type: JsonNodeType,
   children: JsonNode[],
   parent?: JsonNode
 ) => JsonNode;
-export const get: (url: string, context: JsonNode) => JsonNode | undefined;
+export const get: <T extends JsonNode>(url: string, context: T) => T | undefined;
 export const uri: (node: JsonNode) => string;
 export const value: <A>(node: JsonNode) => A;
 export const has: (key: string, node: JsonNode) => boolean;
-export const typeOf: (node: JsonNode) => JsonType;
-export const step: (key: string, node: JsonNode) => JsonNode;
-export const iter: (node: JsonNode) => Generator<JsonNode>;
-export const keys: (node: JsonNode) => Generator<JsonNode>;
-export const values: (node: JsonNode) => Generator<JsonNode>;
-export const entries: (node: JsonNode) => Generator<[JsonNode, JsonNode]>;
-export const length: (node: JsonNode) => number;
+export const typeOf: (node: JsonNode) => JsonNodeType;
+export const step: <T extends JsonNode>(key: string, node: T) => T | undefined;
+export const iter: <T extends JsonNode>(node: T) => Generator<T>;
+export const keys: <T extends JsonNode>(node: T) => Generator<T>;
+export const values: <T extends JsonNode>(node: T) => Generator<T>;
+export const entries: <T extends JsonNode>(node: T) => Generator<[T, T]>;
+export const length: <T extends JsonNode>(node: T) => number;
 
-export const allNodes: (node: JsonNode) => Generator<JsonNode>;
+export const allNodes: <T extends JsonNode>(node: T) => Generator<T>;
 
 export type JsonNode = {
   baseUri: string;