diff --git a/lib/get-md-files-in-dir.ts b/lib/get-md-files-in-dir.ts
deleted file mode 100644
index a638622..0000000
--- a/lib/get-md-files-in-dir.ts
+++ /dev/null
@@ -1,12 +0,0 @@
-import { readdir } from 'fs';
-import { promisify } from 'util';
-import { isMdFile } from './is-md-file';
-
-const readDir = promisify(readdir);
-
-/**
- * Read the directory at the given path and get the markdown files it contains.
- *
- * @returns a promise that resolves with the list of markdown files
- */
-export const getMdFilesInDir = async (path: string) => (await readDir(path)).filter(isMdFile);
diff --git a/package-lock.json b/package-lock.json
index d7e1707..be80c31 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,35 +4,6 @@
   "lockfileVersion": 1,
   "requires": true,
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-        "@babel/plugin-transform-modules-commonjs": "^7.5.0"
-      }
-    },
-    "@ava/babel-preset-transform-test-files": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/@ava/babel-preset-transform-test-files/-/babel-preset-transform-test-files-6.0.0.tgz",
-      "integrity": "sha512-8eKhFzZp7Qcq1VLfoC75ggGT8nQs9q8fIxltU47yCB7Wi7Y8Qf6oqY1Bm0z04fIec24vEgr0ENhDHEOUGVDqnA==",
-      "dev": true,
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     "@babel/code-frame": {
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       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
@@ -42,172 +13,6 @@
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     },
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-        "@babel/helpers": "^7.7.0",
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-        "@babel/traverse": "^7.7.2",
-        "@babel/types": "^7.7.2",
-        "convert-source-map": "^1.7.0",
-        "debug": "^4.1.0",
-        "json5": "^2.1.0",
-        "lodash": "^4.17.13",
-        "resolve": "^1.3.2",
-        "semver": "^5.4.1",
-        "source-map": "^0.5.0"
-      }
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-    "@babel/generator": {
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-      "version": "7.7.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-wrap-function/-/helper-wrap-function-7.7.0.tgz",
-      "integrity": "sha512-sd4QjeMgQqzshSjecZjOp8uKfUtnpmCyQhKQrVJBBgeHAB/0FPi33h3AbVlVp07qQtMD4QgYSzaMI7VwncNK/w==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-function-name": "^7.7.0",
-        "@babel/template": "^7.7.0",
-        "@babel/traverse": "^7.7.0",
-        "@babel/types": "^7.7.0"
-      }
-    },
-    "@babel/helpers": {
-      "version": "7.7.0",
-      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.7.0.tgz",
-      "integrity": "sha512-VnNwL4YOhbejHb7x/b5F39Zdg5vIQpUUNzJwx0ww1EcVRt41bbGRZWhAURrfY32T5zTT3qwNOQFWpn+P0i0a2g==",
-      "dev": true,
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     "@babel/highlight": {
       "version": "7.5.0",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
@@ -232,92 +37,6 @@
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-        "@babel/helper-remap-async-to-generator": "^7.7.0",
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-        "babel-plugin-dynamic-import-node": "^2.3.0"
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       "version": "7.8.3",
       "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.8.3.tgz",
@@ -327,45 +46,6 @@
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@@ -8667,6 +8077,12 @@
       "requires": {
         "fd-slicer": "~1.0.1"
       }
+    },
+    "yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index 268d6c2..20c263e 100644
--- a/package.json
+++ b/package.json
@@ -17,13 +17,13 @@
   "engines": {
     "node": ">= 8.3.0"
   },
-  "main": "index.js",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
   "scripts": {
     "start": "node . --help",
     "build": "tsc",
     "prepare": "npm run build",
-    "pretest": "npm run build",
-    "test": "xo && nyc ava test/lib.spec.js && ava test/api.spec.js && ava test/cli.spec.js",
+    "test": "xo && nyc ava test/lib.spec.ts && ava test/api.spec.ts && ava test/cli.spec.ts",
     "release": "npx standard-version --infile=changelog.md && git push --follow-tags origin master && npm publish"
   },
   "bin": {
@@ -41,7 +41,7 @@
     "get-port": "5.1.1",
     "get-stdin": "7.0.0",
     "gray-matter": "4.0.2",
-    "highlight.js": "9.17.1",
+    "highlight.js": "9.18.0",
     "iconv-lite": "0.5.1",
     "listr": "0.14.3",
     "marked": "0.8.0",
@@ -54,11 +54,12 @@
     "@types/marked": "0.7.2",
     "@types/puppeteer": "2.0.0",
     "@types/serve-handler": "6.1.0",
-    "ava": "2.4.0",
-    "husky": "4.0.10",
+    "ava": "3.0.0",
+    "husky": "4.2.1",
     "nyc": "15.0.0",
     "prettier": "1.19.1",
     "tap-xunit": "2.4.1",
+    "ts-node": "8.6.2",
     "typescript": "3.7.5",
     "xo": "0.25.3"
   },
@@ -67,6 +68,14 @@
       "post-merge": "git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD | grep --quiet package-lock.json && npm install"
     }
   },
+  "ava": {
+    "extensions": [
+      "ts"
+    ],
+    "require": [
+      "ts-node/register"
+    ]
+  },
   "prettier": {
     "printWidth": 120,
     "singleQuote": true,
diff --git a/cli.ts b/src/cli.ts
similarity index 64%
rename from cli.ts
rename to src/cli.ts
index f21f286..f41008d 100755
--- a/cli.ts
+++ b/src/cli.ts
@@ -7,14 +7,13 @@ import path from 'path';
 import arg from 'arg';
 import chalk from 'chalk';
 import Listr from 'listr';
+import getStdin from 'get-stdin';
 import getPort from 'get-port';
 import { watch } from 'chokidar';
 
 import { help } from './lib/help';
-import { getMdFilesInDir } from './lib/get-md-files-in-dir';
-import { serveDirectory } from './lib/serve-dir';
+import { serveDirectory, closeServer } from './lib/serve-dir';
 import { defaultConfig, Config } from './lib/config';
-import { getDir } from './lib/helpers';
 import { convertMdToPdf } from './lib/md-to-pdf';
 import { setProcessAndTermTitle } from './lib/helpers';
 
@@ -24,6 +23,7 @@ import { setProcessAndTermTitle } from './lib/helpers';
 const cliFlags = arg({
 	'--help': Boolean,
 	'--version': Boolean,
+	'--basedir': String,
 	'--watch': Boolean,
 	'--stylesheet': [String],
 	'--css': String,
@@ -48,7 +48,15 @@ const cliFlags = arg({
 });
 
 // --
-// Main
+// Run
+
+main(cliFlags, defaultConfig).catch(error => {
+	console.error(error);
+	process.exit(1);
+});
+
+// --
+// Define Main Function
 
 async function main(args: typeof cliFlags, config: Config) {
 	setProcessAndTermTitle('md-to-pdf');
@@ -61,19 +69,22 @@ async function main(args: typeof cliFlags, config: Config) {
 		return help();
 	}
 
-	const [input, dest] = args._;
+	/**
+	 * 1. Get input.
+	 */
+
+	const files = args._;
 
-	const mdFiles = input ? [input] : await getMdFilesInDir('.');
+	const stdin = await getStdin();
 
-	if (mdFiles.length === 0) {
+	if (files.length === 0 && !stdin) {
 		return help();
 	}
 
-	if (dest) {
-		config.dest = dest;
-	}
+	/**
+	 * 2. Read config file and merge it into the config object.
+	 */
 
-	// merge config from config file
 	if (args['--config-file']) {
 		try {
 			const configFile: Partial<Config> = require(path.resolve(args['--config-file']));
@@ -92,26 +103,48 @@ async function main(args: typeof cliFlags, config: Config) {
 		}
 	}
 
-	// serve directory of first file because all files will be in the same dir
+	/**
+	 * 3. Start the file server.
+	 */
+
+	if (args['--basedir']) {
+		config.basedir = args['--basedir'];
+	}
+
 	config.port = args['--port'] || (await getPort());
-	const server = await serveDirectory(getDir(mdFiles[0]), config.port);
 
-	const getListrTask = (mdFile: string) => ({
-		title: `generating ${args['--as-html'] ? 'HTML' : 'PDF'} from ${chalk.underline(mdFile)}`,
-		task: () => convertMdToPdf(mdFile, config, args),
+	const server = await serveDirectory(config);
+
+	/**
+	 * 4. Either process stdin or create a Listr task for each file.
+	 */
+
+	if (stdin) {
+		await convertMdToPdf({ content: stdin }, config, args).catch(async (error: Error) => {
+			await closeServer(server);
+
+			console.error(error);
+			process.exit(1);
+		});
+
+		await closeServer(server);
+
+		return;
+	}
+
+	const getListrTask = (file: string) => ({
+		title: `generating ${args['--as-html'] ? 'HTML' : 'PDF'} from ${chalk.underline(file)}`,
+		task: () => convertMdToPdf({ path: file }, config, args),
 	});
 
-	// create list of tasks and run concurrently
-	await new Listr(mdFiles.map(getListrTask), { concurrent: true, exitOnError: false })
+	await new Listr(files.map(getListrTask), { concurrent: true, exitOnError: false })
 		.run()
 		.then(() => {
 			if (args['--watch']) {
 				console.log(chalk.bgBlue('\n watching for changes \n'));
 
-				watch(mdFiles).on('change', async mdFile => {
-					await new Listr([getListrTask(mdFile)])
-						.run()
-						.catch((error: Error) => args['--debug'] && console.error(error));
+				watch(files).on('change', async file => {
+					await new Listr([getListrTask(file)]).run().catch((error: Error) => args['--debug'] && console.error(error));
 				});
 			} else {
 				server.close();
@@ -119,11 +152,3 @@ async function main(args: typeof cliFlags, config: Config) {
 		})
 		.catch((error: Error) => (args['--debug'] && console.error(error)) || process.exit(1));
 }
-
-// --
-// Run
-
-main(cliFlags, defaultConfig).catch(error => {
-	console.error(error);
-	process.exit(1);
-});
diff --git a/index.ts b/src/index.ts
similarity index 52%
rename from index.ts
rename to src/index.ts
index 0bb0583..3160eed 100755
--- a/index.ts
+++ b/src/index.ts
@@ -4,21 +4,26 @@ import getPort from 'get-port';
 
 import { defaultConfig, Config } from './lib/config';
 import { serveDirectory } from './lib/serve-dir';
-import { getDir } from './lib/helpers';
 import { convertMdToPdf } from './lib/md-to-pdf';
+import { getDir } from './lib/helpers';
 
 /**
  * Convert a markdown file to PDF.
  *
  * @returns the path that the PDF was written to
  */
-export const mdToPdf = async (mdFile: string, config: Partial<Config> = {}) => {
-	if (typeof mdFile !== 'string') {
-		throw new TypeError(`mdFile has to be a string, received ${typeof mdFile}`);
+export const mdToPdf = async (input: { path: string } | { content: string }, config: Partial<Config> = {}) => {
+	if (!('path' in input ? input.path : input.content)) {
+		throw new Error('Specify either content or path.');
+	}
+
+	if (!config.port) {
+		config.port = await getPort();
 	}
 
-	config.port = config.port || (await getPort());
-	const server = await serveDirectory(getDir(mdFile), config.port);
+	if (!config.basedir) {
+		config.basedir = 'path' in input ? getDir(input.path) : process.cwd();
+	}
 
 	const mergedConfig: Config = {
 		...defaultConfig,
@@ -26,7 +31,9 @@ export const mdToPdf = async (mdFile: string, config: Partial<Config> = {}) => {
 		pdf_options: { ...defaultConfig.pdf_options, ...config.pdf_options },
 	};
 
-	const pdf = await convertMdToPdf(mdFile, mergedConfig);
+	const server = await serveDirectory(mergedConfig);
+
+	const pdf = await convertMdToPdf(input, mergedConfig);
 
 	server.close();
 
diff --git a/lib/config.ts b/src/lib/config.ts
similarity index 95%
rename from lib/config.ts
rename to src/lib/config.ts
index 67d7098..9a37e52 100644
--- a/lib/config.ts
+++ b/src/lib/config.ts
@@ -3,6 +3,7 @@ import { MarkedOptions } from 'marked';
 import { PDFOptions, LaunchOptions } from 'puppeteer';
 
 export const defaultConfig: Config = {
+	basedir: process.cwd(),
 	stylesheet: [resolve(__dirname, '..', '..', 'markdown.css')],
 	css: '',
 	body_class: [],
@@ -29,6 +30,11 @@ export const defaultConfig: Config = {
  * In config keys, dashes of cli flag names are replaced with underscores.
  */
 export interface Config {
+	/**
+	 * Base directory to be served by the file server.
+	 */
+	basedir: string;
+
 	/**
 	 * Optional destination path for the output file (including the extension).
 	 */
diff --git a/lib/get-html.ts b/src/lib/get-html.ts
similarity index 100%
rename from lib/get-html.ts
rename to src/lib/get-html.ts
diff --git a/lib/get-marked-with-highlighter.ts b/src/lib/get-marked-with-highlighter.ts
similarity index 74%
rename from lib/get-marked-with-highlighter.ts
rename to src/lib/get-marked-with-highlighter.ts
index e1a0fe5..a40df20 100644
--- a/lib/get-marked-with-highlighter.ts
+++ b/src/lib/get-marked-with-highlighter.ts
@@ -8,9 +8,9 @@ export const getMarked = (options: MarkedOptions) => {
 	if (!Object.prototype.hasOwnProperty.call(renderer, 'code')) {
 		renderer.code = (code, language) => {
 			// if the given language is not available in highlight.js, fall back to plaintext
-			language = (getLanguage(language) && language) || 'plaintext';
+			const languageName = language && getLanguage(language) ? language : 'plaintext';
 
-			return `<pre><code class="hljs ${language}">${highlight(language, code).value}</code></pre>`;
+			return `<pre><code class="hljs ${languageName}">${highlight(languageName, code).value}</code></pre>`;
 		};
 	}
 
diff --git a/lib/get-output-file-path.ts b/src/lib/get-output-file-path.ts
similarity index 77%
rename from lib/get-output-file-path.ts
rename to src/lib/get-output-file-path.ts
index a5192e9..d5be34e 100644
--- a/lib/get-output-file-path.ts
+++ b/src/lib/get-output-file-path.ts
@@ -4,7 +4,7 @@ import { Config } from './config';
 /**
  * Derive the output file path from the source markdown file.
  */
-export const getOutputFilePath = (mdFilePath: string, config: Config) => {
+export const getOutputFilePath = (mdFilePath: string, config: Partial<Config>) => {
 	const { dir, name } = parse(mdFilePath);
 	const extension = config.as_html ? 'html' : 'pdf';
 
diff --git a/lib/help.ts b/src/lib/help.ts
similarity index 96%
rename from lib/help.ts
rename to src/lib/help.ts
index 702ec19..71cdada 100644
--- a/lib/help.ts
+++ b/src/lib/help.ts
@@ -8,6 +8,7 @@ const helpText = `
     -h, --help ${chalk.dim('...............')} Output usage information
     -v, --version ${chalk.dim('............')} Output version
     -w, --watch ${chalk.dim('..............')} Watch the current file(s) for changes
+    --basedir ${chalk.dim('................')} Base directory to be served by the file server
     --stylesheet ${chalk.dim('.............')} Path to a local or remote stylesheet (can be passed multiple times)
     --css ${chalk.dim('....................')} String of styles
     --body-class ${chalk.dim('.............')} Classes to be added to the body tag (can be passed multiple times)
diff --git a/lib/helpers.ts b/src/lib/helpers.ts
similarity index 100%
rename from lib/helpers.ts
rename to src/lib/helpers.ts
diff --git a/lib/is-http-url.ts b/src/lib/is-http-url.ts
similarity index 100%
rename from lib/is-http-url.ts
rename to src/lib/is-http-url.ts
diff --git a/lib/is-md-file.ts b/src/lib/is-md-file.ts
similarity index 100%
rename from lib/is-md-file.ts
rename to src/lib/is-md-file.ts
diff --git a/lib/md-to-pdf.ts b/src/lib/md-to-pdf.ts
similarity index 69%
rename from lib/md-to-pdf.ts
rename to src/lib/md-to-pdf.ts
index 3dc335e..0e3be6f 100644
--- a/lib/md-to-pdf.ts
+++ b/src/lib/md-to-pdf.ts
@@ -3,17 +3,21 @@ const grayMatter = require('gray-matter');
 
 import { Config } from './config';
 import { readFile } from './read-file';
+import { getMarginObject } from './helpers';
+import { getOutputFilePath } from './get-output-file-path';
 import { getHtml } from './get-html';
 import { writeOutput } from './write-output';
-import { getMarginObject } from './helpers';
 
 /**
  * Convert markdown to pdf.
  */
-export const convertMdToPdf = async (mdFile: string, config: Config, args: any = {}) => {
-	const mdFileContent = await readFile(resolve(mdFile), args['--md-file-encoding'] || config.md_file_encoding);
+export const convertMdToPdf = async (input: { path: string } | { content: string }, config: Config, args: any = {}) => {
+	const mdContent =
+		'content' in input
+			? input.content
+			: await readFile(resolve(input.path), args['--md-file-encoding'] || config.md_file_encoding);
 
-	const { content: md, data: frontMatterConfig } = grayMatter(mdFileContent);
+	const { content: md, data: frontMatterConfig } = grayMatter(mdContent);
 
 	// merge front-matter config
 	config = {
@@ -43,6 +47,14 @@ export const convertMdToPdf = async (mdFile: string, config: Config, args: any =
 		config.pdf_options.margin = getMarginObject(config.pdf_options.margin);
 	}
 
+	// set output destination
+	if (!config.dest) {
+		config.dest =
+			'path' in input
+				? getOutputFilePath(input.path, config)
+				: resolve(process.cwd(), `output.${config.as_html ? 'html' : 'pdf'}`);
+	}
+
 	const highlightStylesheet = resolve(
 		dirname(require.resolve('highlight.js')),
 		'..',
@@ -54,9 +66,9 @@ export const convertMdToPdf = async (mdFile: string, config: Config, args: any =
 
 	const html = getHtml(md, config);
 
-	const output = await writeOutput(mdFile, html, config);
+	const output = await writeOutput(mdContent, html, config);
 
-	if (!output.filename) {
+	if (!('filename' in output)) {
 		throw new Error(`Failed to create ${config.as_html ? 'HTML' : 'PDF'}.`);
 	}
 
diff --git a/lib/read-file.ts b/src/lib/read-file.ts
similarity index 100%
rename from lib/read-file.ts
rename to src/lib/read-file.ts
diff --git a/lib/serve-dir.ts b/src/lib/serve-dir.ts
similarity index 56%
rename from lib/serve-dir.ts
rename to src/lib/serve-dir.ts
index d1559de..0a64126 100644
--- a/lib/serve-dir.ts
+++ b/src/lib/serve-dir.ts
@@ -1,14 +1,20 @@
 import { createServer, Server } from 'http';
 import serveHandler from 'serve-handler';
+import { Config } from './config';
 
 /**
- * Serve a directory on a random port using a HTTP server and the Serve handler.
+ * Serve a directory on a random port using a HTTP server and the serve-handler package.
  *
  * @returns a promise that resolves with the server instance once the server is ready and listening.
  */
-export const serveDirectory = async (path: string, port: number) =>
+export const serveDirectory = async ({ basedir, port }: Config) =>
 	new Promise<Server>(resolve => {
-		const server = createServer((req, res) => serveHandler(req, res, { public: path }));
+		const server = createServer((req, res) => serveHandler(req, res, { public: basedir }));
 
 		server.listen(port, () => resolve(server));
 	});
+
+/**
+ * Close the given server instance asynchronously.
+ */
+export const closeServer = async (server: Server) => new Promise(resolve => server.close(resolve));
diff --git a/lib/write-output.ts b/src/lib/write-output.ts
similarity index 50%
rename from lib/write-output.ts
rename to src/lib/write-output.ts
index 7ee511d..082f3ce 100644
--- a/lib/write-output.ts
+++ b/src/lib/write-output.ts
@@ -8,31 +8,31 @@ import { Config } from './config';
 const writeFile = promisify(fsWriteFile);
 
 /**
- * Create a PDF and write it to disk.
+ * Write the output (either PDF or HTML) to disk.
  *
- * @returns a promise that resolves once the file is written
+ * The reason that relative paths are resolved properly is that the base dir is served locally
  */
-export const writeOutput = async (mdFilePath: string, html: string, config: Config): Promise<{ filename?: string }> => {
+export const writeOutput = async (
+	mdContent: string,
+	html: string,
+	config: Config,
+): Promise<{} | { filename: string; content: string | Buffer }> => {
 	const browser = await puppeteer.launch({ devtools: config.devtools, ...config.launch_options });
 
 	const page = await browser.newPage();
 
-	// make sure that relative paths are resolved properly
 	await page.goto(`http://localhost:${config.port}`);
+	await page.setContent(html); // overwrite the page content with what was generated from the markdown
 
-	// overwrite the content with what was generated from the markdown
-	await page.setContent(html);
-
-	// add all the stylesheets and custom css
 	await Promise.all([
-		...config.stylesheet.map(async stylesheet =>
-			page.addStyleTag(isHttpUrl(stylesheet) ? { url: stylesheet } : { path: stylesheet }),
+		...config.stylesheet.map(
+			async stylesheet => page.addStyleTag(isHttpUrl(stylesheet) ? { url: stylesheet } : { path: stylesheet }), // add each stylesheet
 		),
-		config.css ? page.addStyleTag({ content: config.css }) : undefined,
+		config.css ? page.addStyleTag({ content: config.css }) : undefined, // add custom css
 	]);
 
 	/**
-	 * Wait for network to be idle.
+	 * Trick to wait for network to be idle.
 	 *
 	 * @todo replace with page.waitForNetworkIdle once exposed
 	 * @see https://github.com/GoogleChrome/puppeteer/issues/3083
@@ -45,22 +45,23 @@ export const writeOutput = async (mdFilePath: string, html: string, config: Conf
 	/**
 	 * @todo should it be `getOutputFilePath(config.dest || mdFilePath, config)`?
 	 */
-	const outputFilePath = config.dest || getOutputFilePath(mdFilePath, config);
+	const outputFilePath = config.dest || getOutputFilePath(mdContent, config);
+
+	let outputFileContent: string | Buffer = '';
 
 	if (config.devtools) {
 		await new Promise(resolve => page.on('close', resolve));
 	} else if (config.as_html) {
-		const content = await page.content();
-		await writeFile(outputFilePath, content);
+		outputFileContent = await page.content();
+		await writeFile(outputFilePath, outputFileContent);
 	} else {
-		/**
-		 * @todo replace with `await page.emulateMediaType('screen');` once @types/puppeteer is
-		 */
-		await page.emulateMedia('screen');
-		await page.pdf({ path: outputFilePath, ...config.pdf_options });
+		await page.emulateMediaType('screen');
+		outputFileContent = await page.pdf(config.pdf_options);
+
+		await writeFile(outputFilePath, outputFileContent);
 	}
 
 	await browser.close();
 
-	return config.devtools ? {} : { filename: outputFilePath };
+	return config.devtools ? {} : { filename: outputFilePath, content: outputFileContent };
 };
diff --git a/test/api.spec.js b/test/api.spec.js
deleted file mode 100644
index 15098fc..0000000
--- a/test/api.spec.js
+++ /dev/null
@@ -1,21 +0,0 @@
-const { resolve, basename } = require('path');
-const test = require('ava');
-
-const { mdToPdf } = require('../dist');
-
-test('should compile the basic example to pdf', async t => {
-	const pdf = await mdToPdf(resolve(__dirname, 'basic', 'test.md'), {
-		dest: resolve(__dirname, 'basic', 'api-test.pdf'),
-	});
-
-	t.is(basename(pdf.filename), 'api-test.pdf');
-});
-
-test('should compile the basic example to html', async t => {
-	const pdf = await mdToPdf(resolve(__dirname, 'basic', 'test.md'), {
-		as_html: true,
-		dest: resolve(__dirname, 'basic', 'api-test.html'),
-	});
-
-	t.is(basename(pdf.filename), 'api-test.html');
-});
diff --git a/test/api.spec.ts b/test/api.spec.ts
new file mode 100644
index 0000000..01e5759
--- /dev/null
+++ b/test/api.spec.ts
@@ -0,0 +1,22 @@
+import { resolve, basename } from 'path';
+import test from 'ava';
+
+import { mdToPdf } from '../src';
+
+test('should compile the basic example to pdf', async t => {
+	const pdf = await mdToPdf(
+		{ path: resolve(__dirname, 'basic', 'test.md') },
+		{ dest: resolve(__dirname, 'basic', 'api-test.pdf') },
+	);
+
+	t.is(basename(pdf.filename), 'api-test.pdf');
+});
+
+test('should compile the basic example to html', async t => {
+	const pdf = await mdToPdf(
+		{ path: resolve(__dirname, 'basic', 'test.md') },
+		{ dest: resolve(__dirname, 'basic', 'api-test.html'), as_html: true },
+	);
+
+	t.is(basename(pdf.filename), 'api-test.html');
+});
diff --git a/test/cli.spec.js b/test/cli.spec.js
deleted file mode 100644
index c91dbe4..0000000
--- a/test/cli.spec.js
+++ /dev/null
@@ -1,12 +0,0 @@
-const { resolve } = require('path');
-const { promisify } = require('util');
-const exec = promisify(require('child_process').exec);
-const test = require('ava');
-
-test('should compile the basic example to pdf', async t => {
-	const { stderr } = await exec(
-		`node ${resolve(__dirname, '..', 'dist', 'cli.js')} ${resolve(__dirname, 'basic', 'test.md')}`,
-	);
-
-	t.is(stderr, '');
-});
diff --git a/test/cli.spec.ts b/test/cli.spec.ts
new file mode 100644
index 0000000..cc1b688
--- /dev/null
+++ b/test/cli.spec.ts
@@ -0,0 +1,17 @@
+import { execSync } from 'child_process';
+import { resolve } from 'path';
+import test from 'ava';
+
+test('should compile the basic example to pdf', async t => {
+	t.timeout(15000);
+
+	const cmd = [
+		resolve(__dirname, '..', 'node_modules', '.bin', 'ts-node'), // ts-node binary
+		resolve(__dirname, '..', 'src', 'cli'), // md-to-pdf cli script (typescript)
+		resolve(__dirname, 'basic', 'test.md'), // file to convert
+		'--basedir',
+		resolve(__dirname, 'basic'),
+	].join(' ');
+
+	t.notThrows(() => execSync(cmd));
+});
diff --git a/test/lib.spec.js b/test/lib.spec.ts
similarity index 68%
rename from test/lib.spec.js
rename to test/lib.spec.ts
index 21195a9..a200691 100644
--- a/test/lib.spec.js
+++ b/test/lib.spec.ts
@@ -1,20 +1,43 @@
-const { EOL } = require('os');
-const {
-	posix: { join },
-	sep,
-	resolve,
-} = require('path');
-const test = require('ava');
-
-const { defaultConfig } = require('../dist/lib/config');
-const { getHtml } = require('../dist/lib/get-html');
-const { getMarked } = require('../dist/lib/get-marked-with-highlighter');
-const { getOutputFilePath } = require('../dist/lib/get-output-file-path');
-const { getDir, getMarginObject } = require('../dist/lib/helpers');
-const { readFile } = require('../dist/lib/read-file');
-const { isMdFile } = require('../dist/lib/is-md-file');
-const { isHttpUrl } = require('../dist/lib/is-http-url');
-const { getMdFilesInDir } = require('../dist/lib/get-md-files-in-dir');
+import { EOL } from 'os';
+import { posix, sep, resolve } from 'path';
+import test from 'ava';
+import { Renderer } from 'marked';
+
+import { setProcessAndTermTitle, getDir, getMarginObject } from '../src/lib/helpers';
+import { defaultConfig } from '../src/lib/config';
+import { getHtml } from '../src/lib/get-html';
+import { getMarked } from '../src/lib/get-marked-with-highlighter';
+import { getOutputFilePath } from '../src/lib/get-output-file-path';
+import { readFile } from '../src/lib/read-file';
+import { isMdFile } from '../src/lib/is-md-file';
+import { isHttpUrl } from '../src/lib/is-http-url';
+
+// --
+// helpers
+
+test('setProcessAndTermTitle should not throw', t => {
+	t.notThrows(() => setProcessAndTermTitle('md-to-pdf tests'));
+});
+
+test('getDir should get the directory the given file is in', t => {
+	const filePath = posix.join('/', 'var', 'foo', 'bar.txt');
+
+	t.regex(getDir(filePath), new RegExp(`\\${sep}var\\${sep}foo`));
+});
+
+test('getMarginObject should be able to handle all valid CSS margin inputs', t => {
+	t.deepEqual(getMarginObject('1em'), { top: '1em', right: '1em', bottom: '1em', left: '1em' });
+	t.deepEqual(getMarginObject('1px 2px'), { top: '1px', right: '2px', bottom: '1px', left: '2px' });
+	t.deepEqual(getMarginObject('1mm 2mm 3mm'), { top: '1mm', right: '2mm', bottom: '3mm', left: '2mm' });
+	t.deepEqual(getMarginObject('1in 2in 3in 4in'), { top: '1in', right: '2in', bottom: '3in', left: '4in' });
+
+	t.is(getMarginObject(''), undefined);
+
+	t.throws(() => getMarginObject(undefined as any));
+	t.throws(() => getMarginObject({} as any));
+	t.throws(() => getMarginObject(0 as any));
+	t.throws(() => getMarginObject('1em 2em 3em 4em 5em'));
+});
 
 // --
 // get-html
@@ -54,37 +77,37 @@ test('getMarked should highlight unknown code as plaintext', t => {
 	t.true(html.includes('<code class="hljs plaintext">'));
 });
 
-// --
-// get-pdf-file-path
+test('getMarked should accept a custom renderer', t => {
+	const renderer = new Renderer();
 
-test('getOutputFilePath should return the same path but with different extension', t => {
-	const mdFilePath = join('/', 'var', 'foo', 'bar.md');
+	renderer.link = (href, title, text) =>
+		`<a class="custom" href="${href}"${title ? ` title="${title}"` : ''}>${text}</a>`;
 
-	t.is(getOutputFilePath(mdFilePath, {}), `${sep}var${sep}foo${sep}bar.pdf`);
-	t.is(getOutputFilePath(mdFilePath, { as_html: true }), `${sep}var${sep}foo${sep}bar.html`);
+	const marked = getMarked({ renderer });
+	const html = marked('[Foo](/bar)');
+
+	t.true(html.includes('<a class="custom" href="/bar">Foo</a>'));
 });
 
-// --
-// helpers
+test('getMarked should accept a custom renderer with custom code highlighter', t => {
+	const renderer = new Renderer();
 
-test('getDir should get the directory the given file is in', t => {
-	const filePath = join('/', 'var', 'foo', 'bar.txt');
+	renderer.code = code => `<custom-code>${code}</custom-code>`;
 
-	t.regex(getDir(filePath), new RegExp(`\\${sep}var\\${sep}foo`));
+	const marked = getMarked({ renderer });
+	const html = marked('```\nvar foo="bar";\n```');
+
+	t.true(html.includes('<custom-code>var foo="bar";</custom-code>'));
 });
 
-test('getMarginObject should be able to handle all valid CSS margin inputs', t => {
-	t.deepEqual(getMarginObject('1em'), { top: '1em', right: '1em', bottom: '1em', left: '1em' });
-	t.deepEqual(getMarginObject('1px 2px'), { top: '1px', right: '2px', bottom: '1px', left: '2px' });
-	t.deepEqual(getMarginObject('1mm 2mm 3mm'), { top: '1mm', right: '2mm', bottom: '3mm', left: '2mm' });
-	t.deepEqual(getMarginObject('1in 2in 3in 4in'), { top: '1in', right: '2in', bottom: '3in', left: '4in' });
+// --
+// get-pdf-file-path
 
-	t.is(getMarginObject(''), undefined);
+test('getOutputFilePath should return the same path but with different extension', t => {
+	const mdFilePath = posix.join('/', 'var', 'foo', 'bar.md');
 
-	t.throws(() => getMarginObject(undefined));
-	t.throws(() => getMarginObject({}));
-	t.throws(() => getMarginObject(0));
-	t.throws(() => getMarginObject('1em 2em 3em 4em 5em'));
+	t.is(getOutputFilePath(mdFilePath, {}), `${sep}var${sep}foo${sep}bar.pdf`);
+	t.is(getOutputFilePath(mdFilePath, { as_html: true }), `${sep}var${sep}foo${sep}bar.html`);
 });
 
 // --
@@ -129,11 +152,3 @@ test('isUrl should return true for strings that are valid http(s) urls', t => {
 	t.is(isHttpUrl('file:///foobar'), false);
 	t.is(isHttpUrl('C:\\foo\\bar'), false);
 });
-
-// --
-// get-md-files-in-dir
-
-test('getMdFilesInDir should return the list of markdown files in a directory', async t => {
-	t.deepEqual(await getMdFilesInDir('./lib'), []);
-	t.deepEqual(await getMdFilesInDir('.'), ['changelog.md', 'readme.md']);
-});