modified

node_modules/tmp-cache/lib/index.js

@@ -0,0 +1,41 @@
+class Cache extends Map {
+	constructor(opts={}) {
+		super();
+
+		if (typeof opts === 'number') {
+			opts = { max:opts };
+		}
+
+		let { max, maxAge } = opts;
+		this.max = max > 0 && max || Infinity;
+		this.maxAge = maxAge !== void 0 ? maxAge : -1;
+		this.stale = !!opts.stale;
+	}
+
+	peek(key) {
+		return this.get(key, false);
+	}
+
+	set(key, content, maxAge = this.maxAge) {
+		this.has(key) && this.delete(key);
+		(this.size + 1 > this.max) && this.delete(this.keys().next().value);
+		let expires = maxAge > -1 && (maxAge + Date.now());
+		return super.set(key, { expires, content });
+	}
+
+	get(key, mut=true) {
+		let x = super.get(key);
+		if (x === void 0) return x;
+
+		let { expires, content } = x;
+		if (expires !== false && Date.now() >= expires) {
+			this.delete(key);
+			return this.stale ? content : void 0;
+		}
+
+		if (mut) this.set(key, content);
+		return content;
+	}
+}
+
+module.exports = Cache;