diff --git a/package.json b/package.json
index e62b7f4b08..0d306c1060 100644
--- a/package.json
+++ b/package.json
@@ -122,7 +122,8 @@
     "rimraf": "^3.0.2",
     "serve": "^11.3.2",
     "stylelint": "^13.10.0",
-    "typescript": "^3.9.5"
+    "tslib": "^2.1.0",
+    "typescript": "^4.1.5"
   },
   "lint-staged": {
     "*.{js,jsx,ts,tsx}": [
diff --git a/packages/docusaurus-init/package.json b/packages/docusaurus-init/package.json
index 1071595250..6412074243 100644
--- a/packages/docusaurus-init/package.json
+++ b/packages/docusaurus-init/package.json
@@ -28,7 +28,8 @@
     "lodash": "^4.17.20",
     "prompts": "^2.4.0",
     "semver": "^7.3.4",
-    "shelljs": "^0.8.4"
+    "shelljs": "^0.8.4",
+    "tslib": "^2.1.0"
   },
   "engines": {
     "node": ">=12.13.0"
diff --git a/packages/docusaurus-mdx-loader/src/remark/toc/search.js b/packages/docusaurus-mdx-loader/src/remark/toc/search.js
index 0821ec6d5f..54d8eb2eec 100644
--- a/packages/docusaurus-mdx-loader/src/remark/toc/search.js
+++ b/packages/docusaurus-mdx-loader/src/remark/toc/search.js
@@ -9,7 +9,7 @@
 
 const toString = require('mdast-util-to-string');
 const visit = require('unist-util-visit');
-const {toValue} = require('../utils');
+const toValue = require('../utils').toValue;
 
 /** @typedef {import('@docusaurus/types').TOCItem} TOC */
 /** @typedef {import('unist').Node} Node */
diff --git a/packages/docusaurus-migrate/package.json b/packages/docusaurus-migrate/package.json
index faf2835294..e8a25f5a76 100644
--- a/packages/docusaurus-migrate/package.json
+++ b/packages/docusaurus-migrate/package.json
@@ -39,6 +39,7 @@
     "remark-parse": "^8.0.2",
     "remark-stringify": "^8.1.0",
     "semver": "^7.3.4",
+    "tslib": "^2.1.0",
     "unified": "^9.2.0",
     "unist-util-visit": "^2.0.2"
   },
diff --git a/packages/docusaurus-plugin-client-redirects/package.json b/packages/docusaurus-plugin-client-redirects/package.json
index 7f7e5549e5..b66068fd1b 100644
--- a/packages/docusaurus-plugin-client-redirects/package.json
+++ b/packages/docusaurus-plugin-client-redirects/package.json
@@ -26,7 +26,8 @@
     "fs-extra": "^9.1.0",
     "globby": "^11.0.2",
     "joi": "^17.4.0",
-    "lodash": "^4.17.20"
+    "lodash": "^4.17.20",
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "react": "^16.8.4 || ^17.0.0",
diff --git a/packages/docusaurus-plugin-content-blog/package.json b/packages/docusaurus-plugin-content-blog/package.json
index d7ab91e1da..757d536d01 100644
--- a/packages/docusaurus-plugin-content-blog/package.json
+++ b/packages/docusaurus-plugin-content-blog/package.json
@@ -32,6 +32,7 @@
     "lodash": "^4.17.20",
     "reading-time": "^1.3.0",
     "remark-admonitions": "^1.2.1",
+    "tslib": "^2.1.0",
     "webpack": "^4.44.1"
   },
   "peerDependencies": {
diff --git a/packages/docusaurus-plugin-content-docs/package.json b/packages/docusaurus-plugin-content-docs/package.json
index e08440c82f..461e2668c4 100644
--- a/packages/docusaurus-plugin-content-docs/package.json
+++ b/packages/docusaurus-plugin-content-docs/package.json
@@ -39,6 +39,7 @@
     "lodash": "^4.17.20",
     "remark-admonitions": "^1.2.1",
     "shelljs": "^0.8.4",
+    "tslib": "^2.1.0",
     "utility-types": "^3.10.0",
     "webpack": "^4.44.1"
   },
diff --git a/packages/docusaurus-plugin-content-pages/package.json b/packages/docusaurus-plugin-content-pages/package.json
index 18f8bdf58c..181be63301 100644
--- a/packages/docusaurus-plugin-content-pages/package.json
+++ b/packages/docusaurus-plugin-content-pages/package.json
@@ -30,6 +30,7 @@
     "minimatch": "^3.0.4",
     "remark-admonitions": "^1.2.1",
     "slash": "^3.0.0",
+    "tslib": "^2.1.0",
     "webpack": "^4.44.1"
   },
   "peerDependencies": {
diff --git a/packages/docusaurus-plugin-debug/package.json b/packages/docusaurus-plugin-debug/package.json
index 3d1ff6d59f..387dd87dc8 100644
--- a/packages/docusaurus-plugin-debug/package.json
+++ b/packages/docusaurus-plugin-debug/package.json
@@ -20,7 +20,8 @@
     "@docusaurus/core": "2.0.0-alpha.72",
     "@docusaurus/types": "2.0.0-alpha.72",
     "@docusaurus/utils": "2.0.0-alpha.72",
-    "react-json-view": "^1.21.1"
+    "react-json-view": "^1.21.1",
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "react": "^16.8.4 || ^17.0.0",
diff --git a/packages/docusaurus-plugin-ideal-image/package.json b/packages/docusaurus-plugin-ideal-image/package.json
index 74aafbf1ca..d73e20d3e5 100644
--- a/packages/docusaurus-plugin-ideal-image/package.json
+++ b/packages/docusaurus-plugin-ideal-image/package.json
@@ -27,6 +27,7 @@
     "@endiliey/responsive-loader": "^1.3.2",
     "react-waypoint": "^9.0.2",
     "sharp": "^0.27.1",
+    "tslib": "^2.1.0",
     "webpack": "^4.44.1"
   },
   "peerDependencies": {
diff --git a/packages/docusaurus-plugin-sitemap/package.json b/packages/docusaurus-plugin-sitemap/package.json
index 0a228c5fb2..21fb3ba9a4 100644
--- a/packages/docusaurus-plugin-sitemap/package.json
+++ b/packages/docusaurus-plugin-sitemap/package.json
@@ -22,7 +22,8 @@
     "@docusaurus/utils": "2.0.0-alpha.72",
     "fs-extra": "^9.1.0",
     "joi": "^17.4.0",
-    "sitemap": "^6.3.6"
+    "sitemap": "^6.3.6",
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "react": "^16.8.4 || ^17.0.0",
diff --git a/packages/docusaurus-theme-classic/src/theme/prism-include-languages.ts b/packages/docusaurus-theme-classic/src/theme/prism-include-languages.ts
index e1c8131398..0a0a7da475 100644
--- a/packages/docusaurus-theme-classic/src/theme/prism-include-languages.ts
+++ b/packages/docusaurus-theme-classic/src/theme/prism-include-languages.ts
@@ -21,7 +21,7 @@ const prismIncludeLanguages = (PrismObject: typeof PrismNamespace): void => {
       require(`prismjs/components/prism-${lang}`); // eslint-disable-line
     });
 
-    delete window.Prism;
+    delete (window as Window & {Prism?: typeof PrismNamespace}).Prism;
   }
 };
 
diff --git a/packages/docusaurus-theme-common/package.json b/packages/docusaurus-theme-common/package.json
index 4f367d1ea3..8ac4ffd07e 100644
--- a/packages/docusaurus-theme-common/package.json
+++ b/packages/docusaurus-theme-common/package.json
@@ -22,7 +22,8 @@
     "@docusaurus/plugin-content-blog": "2.0.0-alpha.72",
     "@docusaurus/plugin-content-docs": "2.0.0-alpha.72",
     "@docusaurus/plugin-content-pages": "2.0.0-alpha.72",
-    "@docusaurus/types": "2.0.0-alpha.72"
+    "@docusaurus/types": "2.0.0-alpha.72",
+    "tslib": "^2.1.0"
   },
   "devDependencies": {
     "@docusaurus/module-type-aliases": "2.0.0-alpha.72"
diff --git a/packages/docusaurus-utils-validation/package.json b/packages/docusaurus-utils-validation/package.json
index 2425a98060..158e15d480 100644
--- a/packages/docusaurus-utils-validation/package.json
+++ b/packages/docusaurus-utils-validation/package.json
@@ -20,7 +20,8 @@
   "dependencies": {
     "@docusaurus/utils": "2.0.0-alpha.72",
     "chalk": "^4.1.0",
-    "joi": "^17.4.0"
+    "joi": "^17.4.0",
+    "tslib": "^2.1.0"
   },
   "engines": {
     "node": ">=12.13.0"
diff --git a/packages/docusaurus-utils/package.json b/packages/docusaurus-utils/package.json
index 203da806e8..c5b4b52b93 100644
--- a/packages/docusaurus-utils/package.json
+++ b/packages/docusaurus-utils/package.json
@@ -25,7 +25,8 @@
     "fs-extra": "^9.1.0",
     "gray-matter": "^4.0.2",
     "lodash": "^4.17.20",
-    "resolve-pathname": "^3.0.0"
+    "resolve-pathname": "^3.0.0",
+    "tslib": "^2.1.0"
   },
   "engines": {
     "node": ">=12.13.0"
diff --git a/packages/docusaurus/package.json b/packages/docusaurus/package.json
index 9b66fa88a9..ada4dbe087 100644
--- a/packages/docusaurus/package.json
+++ b/packages/docusaurus/package.json
@@ -107,6 +107,7 @@
     "shelljs": "^0.8.4",
     "std-env": "^2.2.1",
     "terser-webpack-plugin": "^4.1.0",
+    "tslib": "^2.1.0",
     "update-notifier": "^5.1.0",
     "url-loader": "^4.1.1",
     "wait-on": "^5.2.1",
diff --git a/packages/docusaurus/src/client/prefetch.ts b/packages/docusaurus/src/client/prefetch.ts
index 4952c34318..5f14ccc3b3 100644
--- a/packages/docusaurus/src/client/prefetch.ts
+++ b/packages/docusaurus/src/client/prefetch.ts
@@ -43,7 +43,7 @@ function linkPrefetchStrategy(url: string) {
   });
 }
 
-function xhrPrefetchStrategy(url: string) {
+function xhrPrefetchStrategy(url: string): Promise<void> {
   return new Promise((resolve, reject) => {
     const req = new XMLHttpRequest();
     req.open('GET', url, true);
diff --git a/tsconfig.json b/tsconfig.json
index c6c2da9e45..03a8307a46 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,10 +1,10 @@
 {
   "compilerOptions": {
-    "target": "es2017",
+    "target": "ES2019",
     "module": "commonjs",
-    "lib": ["es2017","es2019.array", "DOM"],
+    "lib": ["ESNext", "DOM"],
     "declaration": true,
-    "declarationMap": true,
+    "declarationMap": false,
     "jsx": "react",
 
     /* Strict Type-Checking Options */
@@ -30,7 +30,11 @@
     "esModuleInterop": true,
 
     /* Advanced Options */
-    "resolveJsonModule": true
+    "resolveJsonModule": true,
+
+    /* Use tslib */
+    "importHelpers": true,
+    "noEmitHelpers": true,
   },
   "exclude": ["node_modules", "**/__tests__/**/*", "**/lib/**/*"]
 }
diff --git a/website/docs/deployment.mdx b/website/docs/deployment.mdx
index 7036333394..5bb98dfbc3 100644
--- a/website/docs/deployment.mdx
+++ b/website/docs/deployment.mdx
@@ -406,14 +406,14 @@ You can deploy any other changes in the future with the command `surge`.
 
 3. Initialize your project with `quant init` and fill in your credentials:
 
-  ``` bash
-  quant init
-  ```
+```bash
+quant init
+```
 
 4. Deploy your site
 
-  ``` bash
-  quant deploy
-  ```
+```bash
+quant deploy
+```
 
 See [docs](https://docs.quantcdn.io/docs/cli/continuous-integration) and [blog](https://www.quantcdn.io/blog) for more examples and use cases for deploying to QuantCDN.
diff --git a/yarn.lock b/yarn.lock
index eabc476007..96d103e2df 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -19834,11 +19834,16 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@^3.8.3, typescript@^3.9.5:
+typescript@^3.8.3:
   version "3.9.7"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.9.7.tgz#98d600a5ebdc38f40cb277522f12dc800e9e25fa"
   integrity sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==
 
+typescript@^4.1.5:
+  version "4.2.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.3.tgz#39062d8019912d43726298f09493d598048c1ce3"
+  integrity sha512-qOcYwxaByStAWrBf4x0fibwZvMRG+r4cQoTjbPtUlrWjBHbmCAww1i448U0GJ+3cNNEtebDteo/cHOR3xJ4wEw==
+
 ua-parser-js@^0.7.18:
   version "0.7.21"
   resolved "https://registry.yarnpkg.com/ua-parser-js/-/ua-parser-js-0.7.21.tgz#853cf9ce93f642f67174273cc34565ae6f308777"