typedefs?????

.flowconfig

@@ -0,0 +1,11 @@
+[ignore]
+
+[include]
+
+[libs]
+
+[lints]
+
+[options]
+
+[strict]

.gitignore

@@ -0,0 +1 @@
+node_modules

dist/patcher.js

@@ -0,0 +1 @@
+"use strict";function monkeyPatch(e,t,o){var n=Symbol();const i=o.before,c=o.instead,f=o.after,r=new Proxy(t[e],{apply:(e,t,[n,r])=>{void 0!==i&&i.apply(n,r);const a=void 0!==o.instead?c.apply(n,[e.bind(n),...r]):e.apply(n,r);return void 0===f?a:f.apply(n,[a].concat(r))}}),a=t[e];t[e]=function(){return r(this,arguments)};var u=()=>{t[e]=a};return t[n]={name:e,orig:a,unpatch:u},u}function before(e,t,n){return monkeyPatch(e,t,{before:n})}function instead(e,t,n){return monkeyPatch(e,t,{instead:n})}function after(e,t,n){return monkeyPatch(e,t,{after:n})}module.exports={monkeyPatch:monkeyPatch,before:before,instead:instead,after:after};

dist/patcher.js.flow

@@ -0,0 +1,49 @@
+// @flow
+function monkeyPatch(name: string, parentObj: Object, patches: Object): ()=>void {
+	const injId   = Symbol()
+	const before  = patches["before"];
+	const instead = patches["instead"];
+	const after   = patches["after"];
+	const handler = {
+		apply: (target, thisArg, [ctx, args]) => {
+			if (before !== undefined) before.apply(ctx, args);
+			const res = (patches["instead"] !== undefined) ? instead.apply(ctx, [target.bind(ctx), ...args]) : target.apply(ctx, args)
+			if (after === undefined) return res
+			return after.apply(ctx, [res].concat(args));
+		}
+	};
+	const prox = new Proxy(parentObj[name], handler);
+	const orig = parentObj[name];
+	parentObj[name] = function() {
+		return prox(this, arguments);
+	};
+	const unpatch = () => {
+		parentObj[name] = orig;
+	}
+	parentObj[injId] = {
+		name:    name,
+		orig:    orig,
+		unpatch: unpatch
+	};
+	return unpatch;
+}
+
+function before(name: string, parentObj: Object, func: (...args: mixed[])=>void): ()=>void {
+	return monkeyPatch(name, parentObj, {before: func})
+}
+
+function instead(name: string, parentObj: Object, func: (orig: (any)=>any, ...args: mixed[])=>any): ()=>void {
+	return monkeyPatch(name, parentObj, {instead: func})
+}
+
+function after(name: string, parentObj: Object, func: (res: any, ...args: mixed[])=>any): ()=>void {
+	return monkeyPatch(name, parentObj, {after: func})
+}
+
+module.exports = {
+	monkeyPatch,
+	before,
+	instead,
+	after
+}
+

package.json

@@ -2,9 +2,9 @@
   "name": "demonpatcher",
   "version": "0.0.5",
   "description": "Patch with the Power of Satan 😈😈😈",
-  "main": "patcher.js",
+  "main": "dist/patcher.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+  	"build": "flow-copy-source src dist && rollup --config rollup.config.js"
   },
   "repository": {
     "type": "git",
@@ -12,5 +12,21 @@
   },
   "author": "ruthenic",
   "license": "BSD-3-Clause",
-  "keywords": ["patcher", "patch", "demon", "devil", "satan", "serious", "hazbin", "hotel", "hell"]
+  "keywords": [
+    "patcher",
+    "patch",
+    "demon",
+    "devil",
+    "satan",
+    "serious",
+    "hazbin",
+    "hotel",
+    "hell"
+  ],
+  "devDependencies": {
+    "flow-copy-source": "^2.0.9",
+    "rollup": "^2.63.0",
+    "rollup-plugin-flow": "^1.1.1",
+    "rollup-plugin-uglify": "^6.0.4"
+  }
 }

rollup.config.js

@@ -0,0 +1,11 @@
+import flow       from 'rollup-plugin-flow'
+import { uglify } from 'rollup-plugin-uglify'
+
+export default {
+	input:   'src/patcher.js',
+	plugins: [flow(), uglify()],
+	output:  {
+		file: 'dist/patcher.js',
+		format: "cjs"
+	}
+}

src/patcher.js

@@ -1,4 +1,5 @@
-function monkeyPatch(name, parentObj, patches) {
+// @flow
+function monkeyPatch(name: string, parentObj: Object, patches: Object): ()=>void {
 	const injId   = Symbol()
 	const before  = patches["before"];
 	const instead = patches["instead"];
@@ -6,7 +7,7 @@ function monkeyPatch(name, parentObj, patches) {
 	const handler = {
 		apply: (target, thisArg, [ctx, args]) => {
 			if (before !== undefined) before.apply(ctx, args);
-			res = (patches["instead"] !== undefined) ? instead.apply(ctx, [target.bind(ctx), ...args]) : target.apply(ctx, args)
+			const res = (patches["instead"] !== undefined) ? instead.apply(ctx, [target.bind(ctx), ...args]) : target.apply(ctx, args)
 			if (after === undefined) return res
 			return after.apply(ctx, [res].concat(args));
 		}
@@ -27,15 +28,15 @@ function monkeyPatch(name, parentObj, patches) {
 	return unpatch;
 }
 
-function before(name, parentObj, func) {
+function before(name: string, parentObj: Object, func: (...args: mixed[])=>void): ()=>void {
 	return monkeyPatch(name, parentObj, {before: func})
 }
 
-function instead(name, parentObj, func) {
+function instead(name: string, parentObj: Object, func: (orig: (any)=>any, ...args: mixed[])=>any): ()=>void {
 	return monkeyPatch(name, parentObj, {instead: func})
 }
 
-function after(name, parentObj, func) {
+function after(name: string, parentObj: Object, func: (res: any, ...args: mixed[])=>any): ()=>void {
 	return monkeyPatch(name, parentObj, {after: func})
 }