diff --git a/code/addons/links/src/utils.test.ts b/code/addons/links/src/utils.test.ts
index 26bdb4b2a832..443886653810 100644
--- a/code/addons/links/src/utils.test.ts
+++ b/code/addons/links/src/utils.test.ts
@@ -60,7 +60,6 @@ describe('preview', () => {
 
     it('should handle functions returning strings', () => {
       const handler = linkTo(
-        // @ts-expect-error
         (a, b) => a + b,
         (a, b) => b + a
       );
diff --git a/code/addons/links/src/utils.ts b/code/addons/links/src/utils.ts
index be551a896451..6c8785c0baae 100644
--- a/code/addons/links/src/utils.ts
+++ b/code/addons/links/src/utils.ts
@@ -53,7 +53,10 @@ const valueOrCall = (args: string[]) => (value: string | ((...args: string[]) =>
   typeof value === 'function' ? value(...args) : value;
 
 export const linkTo =
-  (idOrTitle: string, nameInput?: string | ((...args: any[]) => string)) =>
+  (
+    idOrTitle: string | ((...args: any[]) => string),
+    nameInput?: string | ((...args: any[]) => string)
+  ) =>
   (...args: any[]) => {
     const resolver = valueOrCall(args);
     const title = resolver(idOrTitle);
diff --git a/code/frameworks/angular/src/client/angular-beta/__testfixtures__/input.component.ts b/code/frameworks/angular/src/client/angular-beta/__testfixtures__/input.component.ts
index 93ea8e346f54..abf4205eeaf5 100644
--- a/code/frameworks/angular/src/client/angular-beta/__testfixtures__/input.component.ts
+++ b/code/frameworks/angular/src/client/angular-beta/__testfixtures__/input.component.ts
@@ -1,4 +1,3 @@
-// @ts-nocheck
 import { Component, EventEmitter, Input, Output } from '@angular/core';
 
 export const exportedConstant = 'An exported constant';
diff --git a/code/frameworks/angular/src/client/docs/__testfixtures__/doc-button/input.ts b/code/frameworks/angular/src/client/docs/__testfixtures__/doc-button/input.ts
index f23c9025e421..5aa9fa220ff9 100644
--- a/code/frameworks/angular/src/client/docs/__testfixtures__/doc-button/input.ts
+++ b/code/frameworks/angular/src/client/docs/__testfixtures__/doc-button/input.ts
@@ -1,3 +1,4 @@
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
 // @ts-nocheck
 /* eslint-disable no-console */
 /* eslint-disable no-underscore-dangle */
diff --git a/code/lib/api/src/modules/versions.ts b/code/lib/api/src/modules/versions.ts
index 16469cbfa878..4ef52162d3ee 100644
--- a/code/lib/api/src/modules/versions.ts
+++ b/code/lib/api/src/modules/versions.ts
@@ -1,5 +1,4 @@
 import global from 'global';
-// @ts-ignore (FIXME should be expect-error no typedefs but fails build --prep)
 import semver from '@storybook/semver';
 import memoize from 'memoizerific';
 
diff --git a/code/lib/api/src/typings.d.ts b/code/lib/api/src/typings.d.ts
index 120e82d8e42f..07361984828c 100644
--- a/code/lib/api/src/typings.d.ts
+++ b/code/lib/api/src/typings.d.ts
@@ -1,2 +1,3 @@
 declare module 'global';
 declare module 'preval.macro';
+declare module '@storybook/semver';
diff --git a/code/lib/builder-webpack5/package.json b/code/lib/builder-webpack5/package.json
index 1f81df4b2260..be36f848fb47 100644
--- a/code/lib/builder-webpack5/package.json
+++ b/code/lib/builder-webpack5/package.json
@@ -73,6 +73,7 @@
     "webpack-virtual-modules": "^0.4.3"
   },
   "devDependencies": {
+    "@types/case-sensitive-paths-webpack-plugin": "^2.1.6",
     "@types/terser-webpack-plugin": "^5.2.0",
     "@types/webpack-dev-middleware": "^5.3.0",
     "@types/webpack-hot-middleware": "^2.25.6",
diff --git a/code/lib/builder-webpack5/src/index.ts b/code/lib/builder-webpack5/src/index.ts
index ad6d83e3f1fb..8eb3e4b3e19b 100644
--- a/code/lib/builder-webpack5/src/index.ts
+++ b/code/lib/builder-webpack5/src/index.ts
@@ -8,7 +8,7 @@ import { checkWebpackVersion } from '@storybook/core-webpack';
 
 export * from './types';
 
-let compilation: ReturnType<typeof webpackDevMiddleware>;
+let compilation: ReturnType<typeof webpackDevMiddleware> | undefined;
 let reject: (reason?: any) => void;
 
 type WebpackBuilder = Builder<Configuration, Stats>;
@@ -72,7 +72,6 @@ export const bail: WebpackBuilder['bail'] = async () => {
   }
   // we wait for the compiler to finish it's work, so it's command-line output doesn't interfere
   return new Promise((res, rej) => {
-    // @ts-ignore (FIXME: should be expect-error but fails build --prep)
     if (process && compilation) {
       try {
         compilation.close(() => res());
@@ -134,7 +133,7 @@ const starter: StarterFunction = async function* starterGeneratorFn({
   router.use(webpackHotMiddleware(compiler as any));
 
   const stats = await new Promise<Stats>((ready, stop) => {
-    compilation.waitUntilValid(ready as any);
+    compilation?.waitUntilValid(ready as any);
     reject = stop;
   });
   yield;
@@ -219,10 +218,10 @@ const builder: BuilderFunction = async function* builderGeneratorFn({ startTime,
 
       logger.trace({ message: '=> Preview built', time: process.hrtime(startTime) });
       if (stats && stats.hasWarnings()) {
-        // @ts-ignore (FIXME should be @ts-expect-error but fails build --prep)
+        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- we know it has warnings because of hasWarnings()
         stats
           .toJson({ warnings: true } as StatsOptions)
-          .warnings.forEach((e) => logger.warn(e.message));
+          .warnings!.forEach((e) => logger.warn(e.message));
       }
 
       // https://webpack.js.org/api/node/#run
diff --git a/code/lib/builder-webpack5/src/preview/iframe-webpack.config.ts b/code/lib/builder-webpack5/src/preview/iframe-webpack.config.ts
index 430685f0a6fe..c6d429fe0719 100644
--- a/code/lib/builder-webpack5/src/preview/iframe-webpack.config.ts
+++ b/code/lib/builder-webpack5/src/preview/iframe-webpack.config.ts
@@ -2,7 +2,6 @@ import path from 'path';
 import { DefinePlugin, HotModuleReplacementPlugin, ProgressPlugin, ProvidePlugin } from 'webpack';
 import type { Configuration } from 'webpack';
 import HtmlWebpackPlugin from 'html-webpack-plugin';
-// @ts-ignore
 import CaseSensitivePathsPlugin from 'case-sensitive-paths-webpack-plugin';
 import TerserWebpackPlugin from 'terser-webpack-plugin';
 import VirtualModulePlugin from 'webpack-virtual-modules';
diff --git a/code/lib/builder-webpack5/tsconfig.json b/code/lib/builder-webpack5/tsconfig.json
index 2a948a8f6bd9..314889c338e2 100644
--- a/code/lib/builder-webpack5/tsconfig.json
+++ b/code/lib/builder-webpack5/tsconfig.json
@@ -1,7 +1,8 @@
 {
   "extends": "../../tsconfig.json",
   "compilerOptions": {
-    "strict": true
+    "strict": true,
+    "skipLibCheck": true
   },
   "include": ["src/**/*", "typings.d.ts"],
   "exclude": ["src/**.test.ts"]
diff --git a/code/lib/core-common/src/typings.d.ts b/code/lib/core-common/src/typings.d.ts
index ec323c40f8d7..c33eaba30afa 100644
--- a/code/lib/core-common/src/typings.d.ts
+++ b/code/lib/core-common/src/typings.d.ts
@@ -1,2 +1,3 @@
 declare module 'pnp-webpack-plugin';
 declare module '@storybook/semver';
+declare module 'lazy-universal-dotenv';
diff --git a/code/lib/core-common/src/utils/envs.ts b/code/lib/core-common/src/utils/envs.ts
index b4ff7915b3a3..d354a890fcac 100644
--- a/code/lib/core-common/src/utils/envs.ts
+++ b/code/lib/core-common/src/utils/envs.ts
@@ -1,4 +1,3 @@
-// @ts-ignore (FIXME should be "@ts-expect-error does not have defs, but universal-dotenv is in TS now" but fails build --prep)
 import { getEnvironment } from 'lazy-universal-dotenv';
 import { nodePathsToArray } from './paths';
 
diff --git a/code/lib/core-common/src/utils/normalize-stories.ts b/code/lib/core-common/src/utils/normalize-stories.ts
index d170d87c1818..0750c3bce004 100644
--- a/code/lib/core-common/src/utils/normalize-stories.ts
+++ b/code/lib/core-common/src/utils/normalize-stories.ts
@@ -15,6 +15,7 @@ const DEFAULT_FILES = '**/*.@(mdx|stories.mdx|stories.tsx|stories.ts|stories.jsx
 // TODO: remove - LEGACY support for bad glob patterns we had in SB 5 - remove in SB7
 const fixBadGlob = deprecate(
   (match: RegExpMatchArray) => {
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     // @ts-ignore (FIXME should be "@ts-expect-error this will get removed later anyway" but fails build --prep)
     return match.input.replace(match[1], `@${match[1]}`);
   },
diff --git a/code/lib/core-webpack/src/merge-webpack-config.test.ts b/code/lib/core-webpack/src/merge-webpack-config.test.ts
index b93f38e8539f..e41768955455 100644
--- a/code/lib/core-webpack/src/merge-webpack-config.test.ts
+++ b/code/lib/core-webpack/src/merge-webpack-config.test.ts
@@ -12,8 +12,7 @@ const config: Configuration = {
   module: {
     rules: [{ use: 'r1' }, { use: 'r2' }],
   },
-  // For snapshot readability purposes `plugins` attribute doesn't match the correct type
-  // @ts-expect-errors
+  // @ts-expect-errors For snapshot readability purposes `plugins` attribute doesn't match the correct type
   plugins: ['p1', 'p2'],
   resolve: {
     enforceExtension: true,
@@ -45,8 +44,7 @@ describe('mergeConfigs', () => {
         noParse: /jquery|lodash/,
         rules: [{ use: 'r3' }, { use: 'r4' }],
       },
-      // For snapshot readability purposes `plugins` attribute doesn't match the correct type
-      // @ts-expect-errors
+      // @ts-expect-errors For snapshot readability purposes `plugins` attribute doesn't match the correct type
       plugins: ['p3', 'p4'],
       resolve: {
         enforceExtension: false,
@@ -57,8 +55,7 @@ describe('mergeConfigs', () => {
         },
       },
       optimization: {
-        // For snapshot readability purposes `minimizer` attribute doesn't match the correct type
-        // @ts-expect-errors
+        // @ts-expect-errors For snapshot readability purposes `minimizer` attribute doesn't match the correct type
         minimizer: ['banana'],
       },
     };
@@ -70,8 +67,7 @@ describe('mergeConfigs', () => {
 
   it('merges partial custom config', () => {
     const customConfig: Configuration = {
-      // For snapshot readability purposes `plugins` attribute doesn't match the correct type
-      // @ts-expect-errors
+      // @ts-expect-errors For snapshot readability purposes `plugins` attribute doesn't match the correct type
       plugins: ['p3'],
       resolve: {
         extensions: ['.ts', '.tsx'],
diff --git a/code/lib/preview-web/src/render/StoryRender.ts b/code/lib/preview-web/src/render/StoryRender.ts
index 2d27977bb4f2..f8349ba4d48a 100644
--- a/code/lib/preview-web/src/render/StoryRender.ts
+++ b/code/lib/preview-web/src/render/StoryRender.ts
@@ -34,18 +34,6 @@ export type RenderPhase =
   | 'aborted'
   | 'errored';
 
-function createController(): AbortController {
-  if (AbortController) return new AbortController();
-  // Polyfill for IE11
-  return {
-    signal: { aborted: false },
-    abort() {
-      // @ts-ignore (should be @ts-expect-error but fails build --prep)
-      this.signal.aborted = true;
-    },
-  } as AbortController;
-}
-
 function serializeError(error: any) {
   try {
     const { name = 'Error', message = String(error), stack } = error;
@@ -88,7 +76,7 @@ export class StoryRender<TFramework extends AnyFramework> implements Render<TFra
     public viewMode: ViewMode,
     story?: Story<TFramework>
   ) {
-    this.abortController = createController();
+    this.abortController = new AbortController();
 
     // Allow short-circuiting preparing if we happen to already
     // have the story (this is used by docs mode)
@@ -173,7 +161,7 @@ export class StoryRender<TFramework extends AnyFramework> implements Render<TFra
       // render could conceivably still be running after this call.
       // We might want to change that in the future.
       this.cancelRender();
-      this.abortController = createController();
+      this.abortController = new AbortController();
     }
 
     // We need a stable reference to the signal -- if a re-mount happens the
diff --git a/code/renderers/react/template/stories/errors.stories.tsx b/code/renderers/react/template/stories/errors.stories.tsx
index 3a599df47f2a..ee8773862541 100644
--- a/code/renderers/react/template/stories/errors.stories.tsx
+++ b/code/renderers/react/template/stories/errors.stories.tsx
@@ -26,7 +26,7 @@ export const StoryIsUnrenderable = {
 export const StoryContainsUnrenderable = {
   render: () => (
     <div>
-      {/* @ts-expect-error */}
+      {/* @ts-expect-error we're doing it wrong here on purpose */}
       <BadComponent />
     </div>
   ),
diff --git a/code/yarn.lock b/code/yarn.lock
index a947e264336b..c5b099227f3c 100644
--- a/code/yarn.lock
+++ b/code/yarn.lock
@@ -7789,6 +7789,7 @@ __metadata:
     "@storybook/semver": ^7.3.2
     "@storybook/store": 7.0.0-alpha.33
     "@storybook/theming": 7.0.0-alpha.33
+    "@types/case-sensitive-paths-webpack-plugin": ^2.1.6
     "@types/node": ^14.0.10 || ^16.0.0
     "@types/terser-webpack-plugin": ^5.2.0
     "@types/webpack-dev-middleware": ^5.3.0
@@ -10149,6 +10150,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/case-sensitive-paths-webpack-plugin@npm:^2.1.6":
+  version: 2.1.6
+  resolution: "@types/case-sensitive-paths-webpack-plugin@npm:2.1.6"
+  dependencies:
+    "@types/webpack": ^4
+  checksum: 9f379718393f04937be69e742f9b67e346ecca5badb37a02eb1b740a4f37e1c52033b3a9fef04b82e31b9f58ae72ae02cf1027a57ecd969ff5e1b4e6796375d6
+  languageName: node
+  linkType: hard
+
 "@types/chai-as-promised@npm:^7.1.2":
   version: 7.1.5
   resolution: "@types/chai-as-promised@npm:7.1.5"
diff --git a/scripts/.eslintrc.js b/scripts/.eslintrc.js
index a7b3038b588c..8c0731796770 100644
--- a/scripts/.eslintrc.js
+++ b/scripts/.eslintrc.js
@@ -2,7 +2,7 @@ module.exports = {
   root: true,
   extends: ['@storybook/eslint-config-storybook', 'plugin:storybook/recommended'],
   rules: {
-    '@typescript-eslint/ban-ts-comment': 'warn',
+    '@typescript-eslint/ban-ts-comment': 'error',
     'jest/no-standalone-expect': [
       'error',
       { additionalTestBlockFunctions: ['it.skipWindows', 'it.onWindows'] },