diff --git a/lerna.json b/lerna.json
index 3f04044ac8dd..0d8fbcd8427b 100644
--- a/lerna.json
+++ b/lerna.json
@@ -17,5 +17,5 @@
       "registry": "https://registry.npmjs.org/"
     }
   },
-  "version": "11.1.1-canary.13"
+  "version": "11.1.1-canary.14"
 }
diff --git a/packages/create-next-app/package.json b/packages/create-next-app/package.json
index 0bbf50b71d70..576175ffdeca 100644
--- a/packages/create-next-app/package.json
+++ b/packages/create-next-app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "create-next-app",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "keywords": [
     "react",
     "next",
diff --git a/packages/eslint-config-next/package.json b/packages/eslint-config-next/package.json
index 3ddc47a29269..0bf87f2b2226 100644
--- a/packages/eslint-config-next/package.json
+++ b/packages/eslint-config-next/package.json
@@ -1,6 +1,6 @@
 {
   "name": "eslint-config-next",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "description": "ESLint configuration used by NextJS.",
   "main": "index.js",
   "license": "MIT",
@@ -9,7 +9,7 @@
     "directory": "packages/eslint-config-next"
   },
   "dependencies": {
-    "@next/eslint-plugin-next": "11.1.1-canary.13",
+    "@next/eslint-plugin-next": "11.1.1-canary.14",
     "@rushstack/eslint-patch": "^1.0.6",
     "@typescript-eslint/parser": "^4.20.0",
     "eslint-import-resolver-node": "^0.3.4",
diff --git a/packages/eslint-plugin-next/package.json b/packages/eslint-plugin-next/package.json
index 7387076b5f59..f7e31c64a34b 100644
--- a/packages/eslint-plugin-next/package.json
+++ b/packages/eslint-plugin-next/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/eslint-plugin-next",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "description": "ESLint plugin for NextJS.",
   "main": "lib/index.js",
   "license": "MIT",
diff --git a/packages/next-bundle-analyzer/package.json b/packages/next-bundle-analyzer/package.json
index 1e7765a95716..afcea6cef2ef 100644
--- a/packages/next-bundle-analyzer/package.json
+++ b/packages/next-bundle-analyzer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/bundle-analyzer",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "main": "index.js",
   "license": "MIT",
   "repository": {
diff --git a/packages/next-codemod/package.json b/packages/next-codemod/package.json
index 8d889390c1f4..57b258ed2999 100644
--- a/packages/next-codemod/package.json
+++ b/packages/next-codemod/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/codemod",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "license": "MIT",
   "dependencies": {
     "chalk": "4.1.0",
diff --git a/packages/next-env/package.json b/packages/next-env/package.json
index 3498aa1d9167..a40e64be8c45 100644
--- a/packages/next-env/package.json
+++ b/packages/next-env/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/env",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "keywords": [
     "react",
     "next",
diff --git a/packages/next-mdx/package.json b/packages/next-mdx/package.json
index e99f4c7e6f2b..07b3d75e96d5 100644
--- a/packages/next-mdx/package.json
+++ b/packages/next-mdx/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/mdx",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "main": "index.js",
   "license": "MIT",
   "repository": {
diff --git a/packages/next-plugin-storybook/package.json b/packages/next-plugin-storybook/package.json
index 9ea931290b2c..48b736978878 100644
--- a/packages/next-plugin-storybook/package.json
+++ b/packages/next-plugin-storybook/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/plugin-storybook",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "repository": {
     "url": "vercel/next.js",
     "directory": "packages/next-plugin-storybook"
diff --git a/packages/next-polyfill-module/package.json b/packages/next-polyfill-module/package.json
index fb583ba3f4ff..c61f66a61ed2 100644
--- a/packages/next-polyfill-module/package.json
+++ b/packages/next-polyfill-module/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/polyfill-module",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "description": "A standard library polyfill for ES Modules supporting browsers (Edge 16+, Firefox 60+, Chrome 61+, Safari 10.1+)",
   "main": "dist/polyfill-module.js",
   "license": "MIT",
diff --git a/packages/next-polyfill-nomodule/package.json b/packages/next-polyfill-nomodule/package.json
index e9737db02291..b75be468a787 100644
--- a/packages/next-polyfill-nomodule/package.json
+++ b/packages/next-polyfill-nomodule/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/polyfill-nomodule",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "description": "A polyfill for non-dead, nomodule browsers.",
   "main": "dist/polyfill-nomodule.js",
   "license": "MIT",
diff --git a/packages/next/build/index.ts b/packages/next/build/index.ts
index 061b19351fe1..cf26b1dfcd9f 100644
--- a/packages/next/build/index.ts
+++ b/packages/next/build/index.ts
@@ -176,7 +176,7 @@ export default async function build(
       telemetry.record(events)
     )
 
-    const ignoreTypeScriptErrors = Boolean(config.typescript?.ignoreBuildErrors)
+    const ignoreTypeScriptErrors = Boolean(config.typescript.ignoreBuildErrors)
     const typeCheckStart = process.hrtime()
     const typeCheckingSpinner = createSpinner({
       prefixText: `${Log.prefixes.info} ${
@@ -216,7 +216,7 @@ export default async function build(
       typeCheckingSpinner.stopAndPersist()
     }
 
-    const ignoreESLint = Boolean(config.eslint?.ignoreDuringBuilds)
+    const ignoreESLint = Boolean(config.eslint.ignoreDuringBuilds)
     const eslintCacheDir = path.join(cacheDir, 'eslint/')
     if (!ignoreESLint && runLint) {
       await nextBuildSpan
diff --git a/packages/next/client/index.tsx b/packages/next/client/index.tsx
index 26a2386dd891..86bdc3f6a275 100644
--- a/packages/next/client/index.tsx
+++ b/packages/next/client/index.tsx
@@ -156,6 +156,7 @@ window.__NEXT_P = []
 const headManager: {
   mountedInstances: Set<unknown>
   updateHead: (head: JSX.Element[]) => void
+  getIsSsr?: () => boolean
 } = initHeadManager()
 const appElement: HTMLElement | null = document.getElementById('__next')
 
@@ -163,6 +164,9 @@ let lastRenderReject: (() => void) | null
 let webpackHMR: any
 export let router: Router
 let CachedApp: AppComponent, onPerfEntry: (metric: any) => void
+headManager.getIsSsr = () => {
+  return router.isSsr
+}
 
 class Container extends React.Component<{
   fn: (err: Error, info?: any) => void
diff --git a/packages/next/client/script.tsx b/packages/next/client/script.tsx
index bd26a8b85733..302991bf3468 100644
--- a/packages/next/client/script.tsx
+++ b/packages/next/client/script.tsx
@@ -140,7 +140,7 @@ function Script(props: ScriptProps): JSX.Element | null {
   } = props
 
   // Context is available only during SSR
-  const { updateScripts, scripts } = useContext(HeadManagerContext)
+  const { updateScripts, scripts, getIsSsr } = useContext(HeadManagerContext)
 
   useEffect(() => {
     if (strategy === 'afterInteractive') {
@@ -161,7 +161,10 @@ function Script(props: ScriptProps): JSX.Element | null {
         },
       ])
       updateScripts(scripts)
-    } else {
+    } else if (getIsSsr && getIsSsr()) {
+      // Script has already loaded during SSR
+      LoadCache.add(restProps.id || src)
+    } else if (getIsSsr && !getIsSsr()) {
       loadScript(props)
     }
   }
diff --git a/packages/next/package.json b/packages/next/package.json
index 254800426912..7f866b711c7e 100644
--- a/packages/next/package.json
+++ b/packages/next/package.json
@@ -1,6 +1,6 @@
 {
   "name": "next",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "description": "The React Framework",
   "main": "./dist/server/next.js",
   "license": "MIT",
@@ -66,10 +66,10 @@
   "dependencies": {
     "@babel/runtime": "7.15.3",
     "@hapi/accept": "5.0.2",
-    "@next/env": "11.1.1-canary.13",
-    "@next/polyfill-module": "11.1.1-canary.13",
-    "@next/react-dev-overlay": "11.1.1-canary.13",
-    "@next/react-refresh-utils": "11.1.1-canary.13",
+    "@next/env": "11.1.1-canary.14",
+    "@next/polyfill-module": "11.1.1-canary.14",
+    "@next/react-dev-overlay": "11.1.1-canary.14",
+    "@next/react-refresh-utils": "11.1.1-canary.14",
     "@node-rs/helper": "1.2.1",
     "assert": "2.0.0",
     "ast-types": "0.13.2",
@@ -154,7 +154,7 @@
     "@babel/traverse": "7.15.0",
     "@babel/types": "7.15.0",
     "@napi-rs/cli": "1.1.0",
-    "@next/polyfill-nomodule": "11.1.1-canary.13",
+    "@next/polyfill-nomodule": "11.1.1-canary.14",
     "@taskr/clear": "1.1.0",
     "@taskr/esnext": "1.1.0",
     "@taskr/watch": "1.1.0",
diff --git a/packages/next/server/config-shared.ts b/packages/next/server/config-shared.ts
index 48d577978e2f..d62edf36c62b 100644
--- a/packages/next/server/config-shared.ts
+++ b/packages/next/server/config-shared.ts
@@ -29,10 +29,16 @@ export interface ESLintConfig {
   ignoreDuringBuilds?: boolean
 }
 
+export interface TypeScriptConfig {
+  /** Do not run TypeScript during production builds (`next build`). */
+  ignoreBuildErrors?: boolean
+}
+
 export type NextConfig = { [key: string]: any } & {
   i18n?: I18NConfig | null
 
   eslint?: ESLintConfig
+  typescript?: TypeScriptConfig
 
   headers?: () => Promise<Header[]>
   rewrites?: () => Promise<
@@ -139,6 +145,12 @@ export const defaultConfig: NextConfig = {
   env: {},
   webpack: null,
   webpackDevMiddleware: null,
+  eslint: {
+    ignoreDuringBuilds: false,
+  },
+  typescript: {
+    ignoreBuildErrors: false,
+  },
   distDir: '.next',
   cleanDistDir: true,
   assetPrefix: '',
diff --git a/packages/next/shared/lib/head-manager-context.ts b/packages/next/shared/lib/head-manager-context.ts
index 6a0c85acfbd7..7388a1da7b09 100644
--- a/packages/next/shared/lib/head-manager-context.ts
+++ b/packages/next/shared/lib/head-manager-context.ts
@@ -5,6 +5,7 @@ export const HeadManagerContext: React.Context<{
   mountedInstances?: any
   updateScripts?: (state: any) => void
   scripts?: any
+  getIsSsr?: () => boolean
 }> = React.createContext({})
 
 if (process.env.NODE_ENV !== 'production') {
diff --git a/packages/react-dev-overlay/package.json b/packages/react-dev-overlay/package.json
index a5d5a097bfe0..a53af7fd39c9 100644
--- a/packages/react-dev-overlay/package.json
+++ b/packages/react-dev-overlay/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/react-dev-overlay",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "description": "A development-only overlay for developing React applications.",
   "repository": {
     "url": "vercel/next.js",
diff --git a/packages/react-refresh-utils/package.json b/packages/react-refresh-utils/package.json
index 002499bc94c3..c0c0d745dd04 100644
--- a/packages/react-refresh-utils/package.json
+++ b/packages/react-refresh-utils/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@next/react-refresh-utils",
-  "version": "11.1.1-canary.13",
+  "version": "11.1.1-canary.14",
   "description": "An experimental package providing utilities for React Refresh.",
   "repository": {
     "url": "vercel/next.js",
diff --git a/test/integration/script-loader/pages/page3.js b/test/integration/script-loader/pages/page3.js
index 58453214b172..592bd84b16fe 100644
--- a/test/integration/script-loader/pages/page3.js
+++ b/test/integration/script-loader/pages/page3.js
@@ -4,11 +4,10 @@ const Page = () => {
   return (
     <div class="container">
       <Script id="inline-script">
-        {`(window.onload = function () {
-            const newDiv = document.createElement('div')
-            newDiv.id = 'onload-div'
-            document.querySelector('body').appendChild(newDiv)
-          })`}
+        {`const newDiv = document.createElement('div')
+          newDiv.id = 'onload-div'
+          document.querySelector('body').appendChild(newDiv)
+        `}
       </Script>
       <Script
         id="scriptLazyOnload"
diff --git a/test/integration/script-loader/test/index.test.js b/test/integration/script-loader/test/index.test.js
index 52c4b26dd813..271104b95a29 100644
--- a/test/integration/script-loader/test/index.test.js
+++ b/test/integration/script-loader/test/index.test.js
@@ -128,14 +128,25 @@ describe('Script Loader', () => {
     try {
       browser = await webdriver(appPort, '/')
 
+      // beforeInteractive scripts should load once
+      let documentBIScripts = await browser.elementsByCss(
+        '[src$="documentBeforeInteractive"]'
+      )
+      expect(documentBIScripts.length).toBe(1)
+
       await browser.waitForElementByCss('[href="/page1"]')
       await browser.click('[href="/page1"]')
 
       await browser.waitForElementByCss('.container')
-      await waitFor(1000)
 
       const script = await browser.elementById('scriptBeforeInteractive')
 
+      // Ensure beforeInteractive script isn't duplicated on navigation
+      documentBIScripts = await browser.elementsByCss(
+        '[src$="documentBeforeInteractive"]'
+      )
+      expect(documentBIScripts.length).toBe(1)
+
       // Renders script tag
       expect(script).toBeDefined()
     } finally {