diff --git a/src/payments/lazy.js b/src/payments/lazy.js
index 9eda8e8..d8494fd 100644
--- a/src/payments/lazy.js
+++ b/src/payments/lazy.js
@@ -4,16 +4,16 @@ function prop(object, name, f) {
     Object.defineProperty(object, name, {
         configurable: true,
         enumerable: true,
-        get: function () {
-            let value = f.call(this);
-            this[name] = value;
-            return value;
+        get() {
+            const _value = f.call(this);
+            this[name] = _value;
+            return _value;
         },
-        set: function (value) {
+        set(_value) {
             Object.defineProperty(this, name, {
                 configurable: true,
                 enumerable: true,
-                value: value,
+                value: _value,
                 writable: true,
             });
         },
@@ -21,12 +21,12 @@ function prop(object, name, f) {
 }
 exports.prop = prop;
 function value(f) {
-    let value;
-    return function () {
-        if (value !== undefined)
-            return value;
-        value = f();
-        return value;
+    let _value;
+    return () => {
+        if (_value !== undefined)
+            return _value;
+        _value = f();
+        return _value;
     };
 }
 exports.value = value;
diff --git a/ts_src/payments/lazy.ts b/ts_src/payments/lazy.ts
index 474c8e9..fe0fb6d 100644
--- a/ts_src/payments/lazy.ts
+++ b/ts_src/payments/lazy.ts
@@ -1,17 +1,17 @@
-export function prop(object: Object, name: string, f: () => any): void {
+export function prop(object: {}, name: string, f: () => any): void {
   Object.defineProperty(object, name, {
     configurable: true,
     enumerable: true,
-    get: function() {
-      let value = f.call(this);
-      this[name] = value;
-      return value;
+    get() {
+      const _value = f.call(this);
+      this[name] = _value;
+      return _value;
     },
-    set: function(value) {
+    set(_value) {
       Object.defineProperty(this, name, {
         configurable: true,
         enumerable: true,
-        value: value,
+        value: _value,
         writable: true,
       });
     },
@@ -19,10 +19,10 @@ export function prop(object: Object, name: string, f: () => any): void {
 }
 
 export function value<T>(f: () => T): () => T {
-  let value: T;
-  return function(): T {
-    if (value !== undefined) return value;
-    value = f();
-    return value;
+  let _value: T;
+  return (): T => {
+    if (_value !== undefined) return _value;
+    _value = f();
+    return _value;
   };
 }
diff --git a/types/payments/lazy.d.ts b/types/payments/lazy.d.ts
index 705f530..3463906 100644
--- a/types/payments/lazy.d.ts
+++ b/types/payments/lazy.d.ts
@@ -1,2 +1,2 @@
-export declare function prop(object: Object, name: string, f: () => any): void;
+export declare function prop(object: {}, name: string, f: () => any): void;
 export declare function value<T>(f: () => T): () => T;