Implement, type and document means to setCacheSize through an xget in…

…stance

README.md

@@ -205,6 +205,13 @@ Returns the hash algorithm if any is in use.
 
 Sets an interceptor for the initial HEAD data, useful for programmatically defining a range offset. Returns `false` if the request has already been loaded, `true` if successfully set.
 
+### xget.setCacheCapacity()
+
+- `size`: <[number][]>
+- Returns: <[XGETStream](#xgetstream)>
+
+Set maximum capacity for internal cache.
+
 ### <a id='xgetuse'></a> xget.use(tag, handler)
 
 - `tag`: &lt;[string][]&gt;

lib/index.js

@@ -337,6 +337,10 @@ function xonstructor(url, opts) {
     return hash;
   };
   this.getHashAlgorithm = () => store.hash.algorithm;
+  this.setCacheSize = size => {
+    if (XGET_CHECK_VAR(size, 'size', 'number', false)) store.cache.setCapacity(size);
+    return this;
+  };
   this.use = (tag, fn) => {
     if (store.loaded) throw new XgetException('failed to attach use middleware: content loaded');
     XGET_CHECK_VAR(fn, 'fn', 'function');

typings/index.d.ts

@@ -34,6 +34,7 @@ declare namespace xget {
     getHash(): Buffer;
     getHash(encoding: string): string;
     getHashAlgorithm(): string;
+    setCacheSize(size: number): this;
     setHeadHandler(fn: HeadHandler): boolean;
     use(tag: string, fn: UseMiddlewareFn): this;
     with(tag: string, fn: WithMiddlewareFn): this;