diff --git a/package.json b/package.json
index 56d0364..3df9149 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "emoji-cheat-sheet-generator",
+  "name": "emoji-cheat-sheet",
   "version": "0.0.0-dev",
   "private": true,
   "author": "ikatyang",
@@ -7,6 +7,7 @@
   "homepage": "https://github.com/ikatyang/emoji-cheat-sheet",
   "repository": "https://github.com/ikatyang/emoji-cheat-sheet/tree/generator",
   "scripts": {
+    "lint": "tslint -p ./tsconfig.json",
     "generate": "node ./scripts/generate.js"
   },
   "dependencies": {
@@ -16,6 +17,7 @@
   "devDependencies": {
     "@types/cheerio": "0.22.2",
     "@types/jest": "20.0.2",
+    "@types/node": "8.0.13",
     "@types/request": "0.0.47",
     "jest": "20.0.4",
     "jest-playback": "1.0.0",
diff --git a/src/create-cheat-sheet.ts b/src/create-cheat-sheet.ts
new file mode 100644
index 0000000..2a5a235
--- /dev/null
+++ b/src/create-cheat-sheet.ts
@@ -0,0 +1,157 @@
+import $ = require('cheerio');
+import request = require('request');
+
+// tslint:disable-next-line:no-var-requires
+const package_json = require('../package.json');
+
+const repo_name = package_json.name;
+const repo_author = package_json.author;
+
+const uncategorized = 'Uncategorized';
+
+const api_url = 'https://api.github.com/emojis';
+const sheet_url = 'http://www.emoji-cheat-sheet.com';
+
+const travis_repo_url = `https://travis-ci.org/${repo_author}/${repo_name}`;
+const travis_badge_url = `https://travis-ci.org/${repo_author}/${repo_name}.svg?branch=master`;
+
+const url_descriptions = [
+  ['GitHub Emoji API', api_url],
+  ['Emoji Cheat Sheet', sheet_url],
+].map(([site_name, site_url]) => `[${site_name}](${site_url})`).join(' and ');
+
+// tslint:disable-next-line:max-line-length
+const description = `This cheat sheet is automatically generated from ${url_descriptions}`;
+
+const toc_name = 'Table of Contents';
+
+const top_name = 'top';
+const top_href = '#table-of-contents';
+
+const column_divisions = 2;
+
+type Url = string;
+
+export interface Urls {
+  [site_name: string]: Url;
+}
+
+export interface EmojiTable {
+  [category: string]: string[];
+}
+
+export async function create_cheat_sheet() {
+  const api_html = await get_html(api_url);
+  const sheet_html = await get_html(sheet_url);
+
+  const api_emojis = Object.keys(JSON.parse(api_html));
+  const emoji_table: EmojiTable = {};
+
+  const $html = $.load(sheet_html).root();
+  $html.find('h2').each((_outer_index, category_element) => {
+    const emojis: string[] = [];
+    const category = $(category_element).text();
+    $html.find(`#emoji-${category.toLowerCase()} li .name`).each((_inner_index, emoji_element) => {
+      const emoji = $(emoji_element).text();
+      const index = api_emojis.indexOf(emoji);
+      if (index !== -1) {
+        api_emojis.splice(index, 1);
+        emojis.push(emoji);
+      }
+    });
+    emoji_table[category] = emojis;
+  });
+
+  if (api_emojis.length > 0) {
+    emoji_table[uncategorized] = api_emojis;
+  }
+
+  return create_table(emoji_table);
+}
+
+function create_table(emoji_table: EmojiTable) {
+  const categories = Object.keys(emoji_table);
+  return format(`
+
+    # ${repo_name}
+
+    [![build](${travis_badge_url})](${travis_repo_url})
+
+    ${description}
+
+    ## ${toc_name}
+
+    ${categories.map(category => `- [${category}](#${category.toLowerCase()})`).join('\n')}
+
+    ${
+      categories.map(category => {
+        const emojis = emoji_table[category];
+        return format(`
+
+          ### ${category}
+
+          ${create_table_head()}
+          ${create_table_content(emojis)}
+
+        `);
+      }).join(('\n').repeat(2))
+    }
+
+  `);
+}
+
+function create_table_content(emojis: string[]) {
+  let table_content = '';
+  for (let i = 0; i < emojis.length; i += column_divisions) {
+    const row_emojis = emojis.slice(i, i + column_divisions);
+    while (row_emojis.length < column_divisions) {
+      row_emojis.push('');
+    }
+    table_content += `${format(`
+
+    | [${top_name}](${top_href}) |${
+      row_emojis.map(
+        emoji => emoji.length !== 0
+          ? ` :${emoji}: | \`:${emoji}:\` `
+          : ' | ',
+      ).join(' | ')
+    }|
+
+    `)}\n`;
+  }
+  return table_content;
+}
+
+function create_table_head() {
+  return format(`
+
+  |   |${(' ico | emoji |').repeat(column_divisions)}
+  | - |${(' --- | ----- |').repeat(column_divisions)}
+
+  `);
+}
+
+function format(str: string) {
+  return str.trim().replace(/^ +/mg, '');
+}
+
+async function get_html(url: string) {
+  return new Promise<string>((resolve, reject) => {
+    const options = {url};
+    if (url === api_url) {
+      Object.assign(options, {
+        headers: {'User-Agent': 'https://github.com/ikatyang/emoji-cheat-sheet'},
+      });
+    }
+    request.get(options, (error, response, html) => {
+      if (error || response.statusCode !== 200) {
+        const error_message = Boolean(error)
+          ? error
+          : `Unexpected response status code: ${response.statusCode}`;
+        reject(error_message);
+      } else {
+        resolve(html);
+      }
+    });
+  });
+}
diff --git a/src/generate.ts b/src/generate.ts
deleted file mode 100644
index c9d954f..0000000
--- a/src/generate.ts
+++ /dev/null
@@ -1,65 +0,0 @@
-#!/bin/env node
-
-const fs = require('fs');
-const path = require('path');
-const $ = require('cheerio');
-const request = require('request');
-const markdown = require('./markdown');
-
-const title = 'emoji-cheat-sheet';
-const apiUrl = 'https://api.github.com/emojis';
-const sheetUrl = 'http://www.emoji-cheat-sheet.com';
-
-const outDir = path.resolve(process.cwd(), './generated');
-const outFile = path.join(outDir, 'README.md');
-
-const columnDivisions = 2;
-
-const getHTML = (url) => new Promise((resolve, reject) => {
-  const options = { url };
-  if (url === apiUrl) {
-    Object.assign(options, {
-      headers: { 'User-Agent': 'https://github.com/ikatyang/emoji-cheat-sheet' },
-    });
-  }
-  request.get(options, (error, response, html) => {
-    if (error || response.statusCode !== 200) {
-      reject(error || `Unexpected response status code: ${response.statusCode}`);
-    } else {
-      resolve(html);
-    }
-  });
-});
-
-Promise.all([getHTML(apiUrl), getHTML(sheetUrl)]).then(([apiHTML, sheetHTML]) => {
-  const apiEmojis = Object.keys(JSON.parse(apiHTML));
-  const emojiTable = {};
-  const $html = $.load(sheetHTML).root();
-  $html.find('h2').each((_, categoryElement) => {
-    const emojis = [];
-    const category = $(categoryElement).text();
-    $html.find(`#emoji-${category.toLowerCase()} li .name`).each((_, emojiElement) => {
-      const emoji = $(emojiElement).text();
-      const index = apiEmojis.indexOf(emoji);
-      if (index !== -1) {
-        apiEmojis.splice(index, 1);
-        emojis.push(emoji);
-      }
-    });
-    emojiTable[category] = emojis;
-  });
-  if (apiEmojis.length > 0) {
-    emojiTable['Uncategorized'] = apiEmojis;
-  }
-  if (fs.existsSync(outDir)) {
-    if (!fs.statSync(outDir).isDirectory()) {
-      throw `OutDir '${outDir}' should be a directory.`;
-    }
-  } else {
-    fs.mkdirSync(outDir);
-  }
-  fs.writeFileSync(outFile, markdown.create({
-    'GitHub Emoji API': apiUrl,
-    'Emoji Cheat Sheet': sheetUrl,
-  }, title, emojiTable, columnDivisions));
-});
diff --git a/src/markdown.ts b/src/markdown.ts
deleted file mode 100644
index 11ff9ad..0000000
--- a/src/markdown.ts
+++ /dev/null
@@ -1,60 +0,0 @@
-const format = str => str.trim().replace(/^ +/mg, '');
-
-module.exports = class Markdown {
-
-  static create(urls, title, emojiTable, columnDivisions) {
-    const categories = Object.keys(emojiTable);
-    const urlDescriptions = Object.keys(urls).map((site) => `[${site}](${urls[site]})`).join(' and ');
-    return format(`
-
-      # ${title}
-
-      [![build](https://travis-ci.org/ikatyang/emoji-cheat-sheet.svg?branch=generator)](https://travis-ci.org/ikatyang/emoji-cheat-sheet)
-
-      This cheat sheet is auto-generated from ${urlDescriptions} using [emoji-cheat-sheet-generator](https://github.com/ikatyang/emoji-cheat-sheet/tree/generator).
-
-      ## Table of Contents
-
-      ${categories.map(category => `- [${category}](#${category.toLowerCase()})`).join('\n')}
-
-      ${
-        categories.map(category => {
-          const emojis = emojiTable[category];
-          return format(`
-
-            ### ${category}
-
-            ${this.createTable(emojis, columnDivisions)}
-
-          `);
-        }).join(('\n').repeat(2))
-      }
-
-    `);
-  }
-
-  static createTableHead(columnDivisions) {
-    return format(`
-
-    |   |${(' ico | emoji |').repeat(columnDivisions)}
-    | - |${(' --- | ----- |').repeat(columnDivisions)}
-
-    `);
-  }
-
-  static createTable(emojis, columnDivisions) {
-    let table = this.createTableHead(columnDivisions) + '\n';
-    for (let i = 0; i < emojis.length; i += columnDivisions) {
-      const rowEmojis = emojis.slice(i, i + columnDivisions);
-      while (rowEmojis.length < columnDivisions)
-        rowEmojis.push('');
-      table += format(`
-
-      | [top](#table-of-contents) |${rowEmojis.map((emoji) => emoji ? ` :${emoji}: | \`:${emoji}:\` ` : ' | ').join(' | ')}|
-
-      `) + '\n';
-    }
-    return table;
-  }
-
-};
diff --git a/yarn.lock b/yarn.lock
index 9fea5a5..87850a2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -47,7 +47,7 @@
   version "20.0.2"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-20.0.2.tgz#86c751121fb53dbd39bb1a08c45083da13f2dc67"
 
-"@types/node@*":
+"@types/node@*", "@types/node@8.0.13":
   version "8.0.13"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-8.0.13.tgz#530f0f9254209b0335bf5cc6387822594ef47093"