diff --git a/observable-slim.d.ts b/observable-slim.d.ts
index e636606..82ecdfd 100644
--- a/observable-slim.d.ts
+++ b/observable-slim.d.ts
@@ -1,4 +1,35 @@
-export function create(target: any, domDelay: number | boolean, observer?: (arg0: {
+// Type by StackOverflow user mindlid and 0x6368656174, modified by XDGFX
+// https://stackoverflow.com/a/68404823/10843516
+type DotPrefix<T extends string> = T extends "" ? "" : `.${T}`;
+type Paths<T> = (
+    T extends object
+        ? {
+              [K in Exclude<keyof T, symbol>]: `${K}${
+                  | DotPrefix<Paths<T[K]>>
+                  | ""}`;
+          }[Exclude<keyof T, symbol>]
+        : ""
+) extends infer D
+    ? Extract<D, string>
+    : string;
+
+type PathToJSONPointer<S> = S extends string
+    ? S extends `${infer T}.${infer U}`
+        ? `/${T}${PathToJSONPointer<U>}`
+        : `/${S}`
+    : never;
+
+type Split<S extends string, D extends string> = string extends S
+    ? string
+    : S extends `${infer T}${D}${infer U}`
+    ? U extends Split<U, D>
+        ? T
+        : Split<U, D>
+    : S;
+
+type LastSegment<S> = S extends string ? Split<S, "."> : never;
+
+export interface Mutation<Source extends object, CurrentPath = Paths<Source>> {
     /**
      * Change type.
      */
@@ -6,23 +37,23 @@ export function create(target: any, domDelay: number | boolean, observer?: (arg0
     /**
      * Property name.
      */
-    property: string;
+    property: LastSegment<CurrentPath>;
     /**
      * Property path with the dot notation (e.g. `foo.0.bar`).
      */
-    currentPath: string;
+    currentPath: CurrentPath;
     /**
      * Property path with the JSON pointer syntax (e.g. `/foo/0/bar`). See https://datatracker.ietf.org/doc/html/rfc6901.
      */
-    jsonPointer: string;
+    jsonPointer: PathToJSONPointer<CurrentPath>;
     /**
      * Target object.
      */
-    target: any;
+    target: Source;
     /**
      * Proxy of the target object.
      */
-    proxy: ProxyConstructor;
+    proxy: Source;
     /**
      * New value of the property.
      */
@@ -31,43 +62,19 @@ export function create(target: any, domDelay: number | boolean, observer?: (arg0
      * Previous value of the property
      */
     previousValue?: any;
-}[]) => any): ProxyConstructor;
-export function observe(proxy: ProxyConstructor, observer: (arg0: {
-    /**
-     * Change type.
-     */
-    type: "add" | "update" | "delete";
-    /**
-     * Property name.
-     */
-    property: string;
-    /**
-     * Property path with the dot notation (e.g. `foo.0.bar`).
-     */
-    currentPath: string;
-    /**
-     * Property path with the JSON pointer syntax (e.g. `/foo/0/bar`). See https://datatracker.ietf.org/doc/html/rfc6901.
-     */
-    jsonPointer: string;
-    /**
-     * Target object.
-     */
-    target: any;
-    /**
-     * Proxy of the target object.
-     */
-    proxy: ProxyConstructor;
-    /**
-     * New value of the property.
-     */
-    newValue: any;
-    /**
-     * Previous value of the property
-     */
-    previousValue?: any;
-}[]) => any): void;
-export function pause(proxy: ProxyConstructor): void;
-export function resume(proxy: ProxyConstructor): void;
-export function pauseChanges(proxy: ProxyConstructor): void;
-export function resumeChanges(proxy: ProxyConstructor): void;
-export function remove(proxy: ProxyConstructor): void;
+}
+
+export function create<Source extends object>(
+    target: Source,
+    domDelay: number | boolean,
+    observer?: (mutations: Mutation<Source>[]) => void
+): Source;
+export function observe<Source extends object>(
+    proxy: Source,
+    observer: (mutations: Mutation<Source>[]) => void
+): void;
+export function pause<Source>(proxy: Source): void;
+export function resume<Source>(proxy: Source): void;
+export function pauseChanges<Source>(proxy: Source): void;
+export function resumeChanges<Source>(proxy: Source): void;
+export function remove<Source>(proxy: Source): void;
diff --git a/observable-slim.js b/observable-slim.js
index b074768..f1b8e61 100644
--- a/observable-slim.js
+++ b/observable-slim.js
@@ -532,23 +532,24 @@ var ObservableSlim = (function() {
 	 * @property {string} property Property name.
 	 * @property {string} currentPath Property path with the dot notation (e.g. `foo.0.bar`).
 	 * @property {string} jsonPointer Property path with the JSON pointer syntax (e.g. `/foo/0/bar`). See https://datatracker.ietf.org/doc/html/rfc6901.
-	 * @property {object} target Target object.
-	 * @property {ProxyConstructor} proxy Proxy of the target object.
-	 * @property {*} newValue New value of the property.
-	 * @property {*} [previousValue] Previous value of the property
+	 * @property {Source} target Target object.
+	 * @property {Source} proxy Proxy of the target object.
+	 * @property {Source} newValue New value of the property.
+	 * @property {Source} [previousValue] Previous value of the property
 	 */
 
 	return {
 		/**
+		 * @template Source
 		 * Create a new ES6 `Proxy` whose changes we can observe through the `observe()` method.
-		 * @param {object} target Plain object that we want to observe for changes.
+		 * @param {Source} target Plain object that we want to observe for changes.
 		 * @param {boolean|number} domDelay If `true`, then the observed changes to `target` will be batched up on a 10ms delay (via `setTimeout()`).
 		 * If `false`, then the `observer` function will be immediately invoked after each individual change made to `target`. It is helpful to set
 		 * `domDelay` to `true` when your `observer` function makes DOM manipulations (fewer DOM redraws means better performance). If a number greater
 		 * than zero, then it defines the DOM delay in milliseconds.
-		 * @param {function(ObservableSlimChange[])} [observer] Function that will be invoked when a change is made to the proxy of `target`.
+		 * @param {(mutations: ObservableSlimChange[]) => void} [observer] Function that will be invoked when a change is made to the proxy of `target`.
 		 * When invoked, this function is passed a single argument: an array of `ObservableSlimChange` detailing each change that has been made.
-		 * @returns {ProxyConstructor} Proxy of the target object.
+		 * @returns {Source} Proxy of the target object.
 		 */
 		create: function(target, domDelay, observer) {
 
@@ -583,9 +584,10 @@ var ObservableSlim = (function() {
 		},
 
 		/**
+		 * @template Source
 		 * Add a new observer function to an existing proxy.
-		 * @param {ProxyConstructor} proxy An ES6 `Proxy` created by the `create()` method.
-		 * @param {function(ObservableSlimChange[])} observer Function that will be invoked when a change is made to the proxy of `target`.
+		 * @param {Source} proxy An ES6 `Proxy` created by the `create()` method.
+		 * @param {(mutations: ObservableSlimChange[]) => void} observer Function that will be invoked when a change is made to the proxy of `target`.
 		 * When invoked, this function is passed a single argument: an array of `ObservableSlimChange` detailing each change that has been made.
 		 * @returns {void} Does not return any value.
 		 */
@@ -601,8 +603,9 @@ var ObservableSlim = (function() {
 		},
 
 		/**
+		 * @template Source
 		 * Prevent any observer functions from being invoked when a change occurs to a proxy.
-		 * @param {ProxyConstructor} proxy An ES6 `Proxy` created by the `create()` method.
+		 * @param {Source} proxy An ES6 `Proxy` created by the `create()` method.
 		 * @returns {void} Does not return any value.
 		 */
 		pause: function(proxy) {
@@ -620,8 +623,9 @@ var ObservableSlim = (function() {
 		},
 
 		/**
+		 * @template Source
 		 * Resume execution of any observer functions when a change is made to a proxy.
-		 * @param {ProxyConstructor} proxy An ES6 `Proxy` created by the `create()` method.
+		 * @param {Source} proxy An ES6 `Proxy` created by the `create()` method.
 		 * @returns {void} Does not return any value.
 		 */
 		resume: function(proxy) {
@@ -639,10 +643,11 @@ var ObservableSlim = (function() {
 		},
 
 		/**
+		 * @template Source
 		 * Prevent any changes (i.e., `set`, and `deleteProperty`) from being written to the target object.
 		 * However, the observer functions will still be invoked to let you know what changes **WOULD** have been made.
 		 * This can be useful if the changes need to be approved by an external source before the changes take effect.
-		 * @param {ProxyConstructor} proxy An ES6 `Proxy` created by the `create()` method.
+		 * @param {Source} proxy An ES6 `Proxy` created by the `create()` method.
 		 * @returns {void} Does not return any value.
 		 */
 		pauseChanges: function(proxy){
@@ -660,8 +665,9 @@ var ObservableSlim = (function() {
 		},
 
 		/**
+		 * @template Source
 		 * Resume the changes that were taking place prior to the call to `pauseChanges()` method.
-		 * @param {ProxyConstructor} proxy An ES6 `Proxy` created by the `create()` method.
+		 * @param {Source} proxy An ES6 `Proxy` created by the `create()` method.
 		 * @returns {void} Does not return any value.
 		 */
 		resumeChanges: function(proxy){
@@ -679,8 +685,9 @@ var ObservableSlim = (function() {
 		},
 
 		/**
+		 * @template Source
 		 * Remove the observable and proxy thereby preventing any further callback observers for changes occurring to the target object.
-		 * @param {ProxyConstructor} proxy An ES6 `Proxy` created by the `create()` method.
+		 * @param {Source} proxy An ES6 `Proxy` created by the `create()` method.
 		 * @returns {void} Does not return any value.
 		 */
 		remove: function(proxy) {
diff --git a/package-lock.json b/package-lock.json
index ab68a07..609dfca 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "observable-slim",
-  "version": "0.1.5",
+  "version": "0.1.6",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "observable-slim",
-      "version": "0.1.5",
+      "version": "0.1.6",
       "license": "MIT",
       "devDependencies": {
         "@babel/core": "^7.17.8",
diff --git a/package.json b/package.json
index 87b19d4..fa4bb85 100644
--- a/package.json
+++ b/package.json
@@ -25,8 +25,7 @@
     "lint": "eslint \"**/*.js\"",
     "lint:fix": "eslint \"**/*.js\" --fix",
     "coverage": "nyc report --reporter=text-lcov | coveralls",
-    "build": "gulp",
-    "type": "npx -p typescript tsc"
+    "build": "gulp"
   },
   "babel": {
     "presets": [