Initial boiler plate project

node_modules/next/dist/lib/batcher.d.ts

@@ -0,0 +1,47 @@
+import type { SchedulerFn } from './scheduler';
+type CacheKeyFn<K, C extends string | number | null> = (key: K) => PromiseLike<C> | C;
+type BatcherOptions<K, C extends string | number | null> = {
+    cacheKeyFn?: CacheKeyFn<K, C>;
+    schedulerFn?: SchedulerFn<void>;
+};
+type WorkFn<V, C> = (key: C, resolve: (value: V | PromiseLike<V>) => void) => Promise<V>;
+/**
+ * A wrapper for a function that will only allow one call to the function to
+ * execute at a time.
+ */
+export declare class Batcher<K, V, C extends string | number | null> {
+    private readonly cacheKeyFn?;
+    /**
+     * A function that will be called to schedule the wrapped function to be
+     * executed. This defaults to a function that will execute the function
+     * immediately.
+     */
+    private readonly schedulerFn;
+    private readonly pending;
+    protected constructor(cacheKeyFn?: CacheKeyFn<K, C> | undefined, 
+    /**
+     * A function that will be called to schedule the wrapped function to be
+     * executed. This defaults to a function that will execute the function
+     * immediately.
+     */
+    schedulerFn?: SchedulerFn<void>);
+    /**
+     * Creates a new instance of PendingWrapper. If the key extends a string or
+     * number, the key will be used as the cache key. If the key is an object, a
+     * cache key function must be provided.
+     */
+    static create<K extends string | number | null, V>(options?: BatcherOptions<K, K>): Batcher<K, V, K>;
+    static create<K, V, C extends string | number | null>(options: BatcherOptions<K, C> & Required<Pick<BatcherOptions<K, C>, 'cacheKeyFn'>>): Batcher<K, V, C>;
+    /**
+     * Wraps a function in a promise that will be resolved or rejected only once
+     * for a given key. This will allow multiple calls to the function to be
+     * made, but only one will be executed at a time. The result of the first
+     * call will be returned to all callers.
+     *
+     * @param key the key to use for the cache
+     * @param fn the function to wrap
+     * @returns a promise that resolves to the result of the function
+     */
+    batch(key: K, fn: WorkFn<V, C>): Promise<V>;
+}
+export {};