diff --git a/.gitignore b/.gitignore
index 054179e..f2c0263 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,7 +5,8 @@ logs
 npm-debug.log*
 
 # Transpilation results
-*.js
+index.js
+bin/*.js
 
 # Dependency directories
 node_modules/
@@ -25,3 +26,5 @@ node_modules/
 
 ### JetBrains ###
 .idea/
+yarn.lock
+pnpm-lock.yaml
diff --git a/README.md b/README.md
index eec434b..bbfa847 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ Options:
   -h --help          Shows this.
   -o --out --output  Directory to output transpiled JavaScript. [default: source path]
   -i --ignore        File or directory paths to ignore when transpiling.
+  -f --force         Overwrite existing output files.
 ```
 
 ### Node.js
diff --git a/bin/ts-to-jsdoc b/bin/ts-to-jsdoc
old mode 100644
new mode 100755
diff --git a/bin/ts-to-jsdoc.ts b/bin/ts-to-jsdoc.ts
index 5c9044d..21d0cbb 100644
--- a/bin/ts-to-jsdoc.ts
+++ b/bin/ts-to-jsdoc.ts
@@ -4,7 +4,7 @@ import path from "path";
 import transpile from "../index";
 
 const {
-	"--out": out, "--ignore": ignore, "--help": help, _,
+	"--out": out, "--ignore": ignore, "--force": force, "--help": help, _,
 } = arguments({
 	"--out": String,
 	"-o": "--out",
@@ -13,12 +13,15 @@ const {
 	"--ignore": [String],
 	"-i": "--ignore",
 
+	"--force": Boolean,
+	"-f": "--force",
+
 	"--help": Boolean,
 	"-h": "--help",
 });
 
 const args = {
-	out, ignore, help, _,
+	out, ignore, force, help, _,
 };
 
 const helpMessage = `
@@ -28,7 +31,9 @@ Usage:
 Options:
   -h --help          Shows this.
   -o --out --output  Directory to output transpiled JavaScript. [default: source path]
-  -i --ignore        File or directory paths to ignore when transpiling.`;
+  -i --ignore        File or directory paths to ignore when transpiling.
+  -f --force         Overwrite existing output files.
+`;
 
 if (args.help || Object.keys(args).every((arg) => !args[arg]?.length)) {
 	console.log(helpMessage);
@@ -37,13 +42,13 @@ if (args.help || Object.keys(args).every((arg) => !args[arg]?.length)) {
 
 if (args.out) {
 	args.out = makePathAbsolute(args.out);
-	if (!fs.existsSync(args.out)) {
-		console.error(error(`Output directory ${args.out} does not exist.`));
-		process.exit(1);
-	}
-	if (!fs.lstatSync(args.out).isDirectory()) {
-		console.error(error(`Output directory ${args.out} is not a directory.`));
-		process.exit(1);
+	if (fs.existsSync(args.out)) {
+		if (!args.force) {
+			console.error(error(`Output directory exists: ${args.out}`));
+			process.exit(1);
+		}
+	} else {
+		fs.mkdirSync(args.out);
 	}
 }
 
diff --git a/index.ts b/index.ts
index 6811e47..c2b5ab0 100644
--- a/index.ts
+++ b/index.ts
@@ -65,7 +65,9 @@ function sanitizeType(str: string): string | null {
 	return str;
 }
 
-/** Generate @param documentation from function parameters */
+/**
+ * Generate @param documentation from function parameters, storing it in functionNode
+ */
 function generateParameterDocumentation(functionNode: FunctionLikeDeclaration): void {
 	const params = functionNode.getParameters();
 	for (const param of params) {
@@ -78,23 +80,28 @@ function generateParameterDocumentation(functionNode: FunctionLikeDeclaration):
 			// @ts-ignore
 			.find((tag) => tag.compilerNode.name?.getText() === param.getName());
 
-		const paramName = param.compilerNode.name?.getText();
+		const paramNameRaw = param.compilerNode.name?.getText();
+		// Skip parameter names if they are present in the type as an object literal
+		// e.g. destructuring; { a }: { a: string }
+		const paramName = paramNameRaw.match(/[{},]/) ? "" : ` ${paramNameRaw}`;
 		if (paramTag) {
-			// Replace tag with one that contains typing info
+			// Replace tag with one that contains type info
 			const comment = paramTag.getComment();
 			const tagName = paramTag.getTagName();
 
-			paramTag.replaceWithText(`@${tagName} {${parameterType}} ${paramName}  ${comment}`);
+			paramTag.replaceWithText(`@${tagName} {${parameterType}}${paramName}  ${comment}`);
 		} else {
 			jsDoc.addTag({
 				tagName: "param",
-				text: `{${parameterType}} ${paramName}`,
+				text: `{${parameterType}}${paramName}`,
 			});
 		}
 	}
 }
 
-/** Generate @returns documentation from function return type */
+/**
+ * Generate @returns documentation from function return type, storing it in functionNode
+ */
 function generateReturnTypeDocumentation(functionNode: FunctionLikeDeclaration): void {
 	const functionReturnType = sanitizeType(functionNode.getReturnType()?.getText());
 	const jsDoc = getJsDocOrCreate(functionNode);
@@ -119,7 +126,9 @@ function generateReturnTypeDocumentation(functionNode: FunctionLikeDeclaration):
 	}
 }
 
-/** Generate documentation for function */
+/**
+ * Generate documentation for a function, storing it in functionNode
+ */
 function generateFunctionDocumentation(functionNode: FunctionLikeDeclaration): void {
 	generateParameterDocumentation(functionNode);
 	generateReturnTypeDocumentation(functionNode);
@@ -161,14 +170,14 @@ function generateClassBaseDocumentation(classNode: ClassDeclaration) {
 	}
 }
 
-/** Generate documentation for class members in general; whether property or method */
+/** Generate documentation for class members in general; either property or method */
 function generateClassMemberDocumentation(classMemberNode: ClassMemberNode): void {
 	generateModifierDocumentation(classMemberNode);
 	Node.isObjectProperty(classMemberNode) && generateInitializerDocumentation(classMemberNode);
 	Node.isMethodDeclaration(classMemberNode) && generateFunctionDocumentation(classMemberNode);
 }
 
-/** Generate documentation for a class -- itself and its members */
+/** Generate documentation for a class — itself and its members */
 function generateClassDocumentation(classNode: ClassDeclaration): void {
 	generateClassBaseDocumentation(classNode);
 	classNode.getMembers().forEach(generateClassMemberDocumentation);
@@ -262,7 +271,7 @@ function generateInterfaceDocumentation(interfaceNode: InterfaceDeclaration): st
 /**
  * Transpile.
  * @param src Source code to transpile
- * @param filename Filename to use internally when transpiling (can be path or just a name)
+ * @param [filename=input.ts] Filename to use internally when transpiling (can be a path or a name)
  * @param [compilerOptions={}] Options for the compiler.
  * 		See https://www.typescriptlang.org/tsconfig#compilerOptions
  * @param [debug=false] Whether to log errors
@@ -270,10 +279,14 @@ function generateInterfaceDocumentation(interfaceNode: InterfaceDeclaration): st
  */
 function transpile(
 	src: string,
-	filename: string,
+	filename = "input.ts",
 	compilerOptions: object = {},
 	debug = false,
 ): string {
+	// Useless variable to prevent comments from getting removed when code contains just
+	// typedefs/interfaces, which get transpiled to nothing but comments
+	const protectCommentsHeader = "const __tsToJsdoc_protectCommentsHeader = 1;\n";
+
 	try {
 		const project = new Project({
 			compilerOptions: {
@@ -283,9 +296,7 @@ function transpile(
 			},
 		});
 
-		// Useless variable to prevent comments from getting removed when code contains just
-		// typedefs/interfaces, which get transpiled to nothing but comments
-		const code = `const __fakeValue = null;\n\n${src}`;
+		const code = protectCommentsHeader + src;
 		// ts-morph throws a fit if the path already exists
 		const sourceFile = project.createSourceFile(
 			`${path.basename(filename, ".ts")}.ts-to-jsdoc.ts`,
@@ -302,8 +313,18 @@ function transpile(
 
 		sourceFile.getFunctions().forEach(generateFunctionDocumentation);
 
-		const result = project.emitToMemory()?.getFiles()?.[0]?.text;
+		let result = project.emitToMemory()?.getFiles()?.[0]?.text;
 		if (result) {
+			if (!result.startsWith(protectCommentsHeader)) {
+				throw new Error(
+					"Internal error: generated header is missing in output\n\n"
+					+ `protectCommentsHeader: ${JSON.stringify(protectCommentsHeader)}\n`
+					+ `Output: ${
+						JSON.stringify(`${result.slice(protectCommentsHeader.length + 100)} ...`)
+					}`,
+				);
+			}
+			result = result.slice(protectCommentsHeader.length);
 			return `${result}\n\n${typedefs}\n\n${interfaces}`;
 		}
 	} catch (e) {
diff --git a/package-lock.json b/package-lock.json
index 00e28fa..7814ecc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "ts-to-jsdoc",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "ts-to-jsdoc",
-      "version": "1.1.2",
+      "version": "1.2.0",
       "license": "MIT",
       "dependencies": {
         "arg": "^5.0.1",
diff --git a/package.json b/package.json
index 74093ca..3564d62 100644
--- a/package.json
+++ b/package.json
@@ -1,10 +1,13 @@
 {
   "name": "ts-to-jsdoc",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "description": "Transpile TypeScript code to fully compatible JavaScript + JSDoc comments.",
   "main": "index.js",
   "bin": "./bin/ts-to-jsdoc",
   "repository": "github:futurGH/ts-to-jsdoc",
+  "scripts": {
+    "build": "tsc --build"
+  },
   "keywords": [
     "doc",
     "docs",
@@ -31,6 +34,7 @@
   },
   "files": [
     "index.js",
-    "bin/ts-to-jsdoc"
+    "bin/ts-to-jsdoc",
+    "bin/ts-to-jsdoc.js"
   ]
 }
diff --git a/tsconfig.json b/tsconfig.json
index e1d4209..6dcbbd4 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,5 +6,8 @@
     "esModuleInterop": true,
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true
-  }
+  },
+  "exclude": [
+    "test/"
+  ]
 }