From 440ac39ec2d3d3721b1d79e9b8c94824c398add2 Mon Sep 17 00:00:00 2001
From: Cameron Knight <ckknight@gmail.com>
Date: Wed, 17 Apr 2019 15:53:08 -0700
Subject: [PATCH 1/2] Use ReadonlyArray instead of Array on input args

The runtime code does not alter the Arrays in question, and it is good form to prefer `ReadonlyArray<T>` over `Array<T>` (aka `T[]`) in the input position when one can.
---
 src/index.d.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/index.d.ts b/src/index.d.ts
index 68fae7a..f874ee1 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -37,7 +37,7 @@ declare class DataLoader<K, V> {
    *     ]);
    *
    */
-  loadMany(keys: K[]): Promise<V[]>;
+  loadMany(keys: ReadonlyArray<K>): Promise<V[]>;
 
   /**
    * Clears the value at `key` from the cache, if it exists. Returns itself for
@@ -70,7 +70,7 @@ declare namespace DataLoader {
 
   // A Function, which when given an Array of keys, returns a Promise of an Array
   // of values or Errors.
-  export type BatchLoadFn<K, V> = (keys: K[]) => Promise<Array<V | Error>>;
+  export type BatchLoadFn<K, V> = (keys: ReadonlyArray<K>) => Promise<Array<V | Error>>;
 
   // Optionally turn off batching or caching or provide a cache key function or a
   // custom cache instance.

From d0374ec0142b6f802e6e48a46313246ff96cada7 Mon Sep 17 00:00:00 2001
From: Lee Byron <lee@leebyron.com>
Date: Wed, 13 Nov 2019 10:25:01 -0800
Subject: [PATCH 2/2] Use ReadonlyArray in promise result

---
 src/index.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/index.d.ts b/src/index.d.ts
index 6540fc7..da9cab0 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -71,7 +71,7 @@ declare namespace DataLoader {
   // A Function, which when given an Array of keys, returns a Promise of an Array
   // of values or Errors.
   export type BatchLoadFn<K, V> = 
-    (keys: ReadonlyArray<K>) => PromiseLike<Array<V | Error>>;
+    (keys: ReadonlyArray<K>) => PromiseLike<ReadonlyArray<V | Error>>;
 
   // Optionally turn off batching or caching or provide a cache key function or a
   // custom cache instance.