diff --git a/package.json b/package.json
index b228f0ce812d22..d14336462d5be9 100644
--- a/package.json
+++ b/package.json
@@ -124,6 +124,7 @@
     "@testing-library/user-event": "13.5.0",
     "@tsconfig/node14": "1.0.3",
     "@types/babel__helper-plugin-utils": "7.10.0",
+    "@types/babel__register": "7.17.0",
     "@types/chrome-remote-interface": "0.30.0",
     "@types/circular-dependency-plugin": "5.0.5",
     "@types/copy-webpack-plugin": "6.4.0",
@@ -135,6 +136,7 @@
     "@types/express": "4.17.2",
     "@types/fs-extra": "8.0.1",
     "@types/glob": "7.1.1",
+    "@types/graphviz": "0.0.34",
     "@types/gulp": "4.0.9",
     "@types/gulp-babel": "6.1.30",
     "@types/gulp-cache": "0.4.5",
@@ -161,6 +163,7 @@
     "@types/scheduler": "0.16.2",
     "@types/semver": "^6.2.0",
     "@types/tmp": "0.2.0",
+    "@types/webpack-bundle-analyzer": "4.4.3",
     "@types/webpack-dev-middleware": "4.1.0",
     "@types/webpack-env": "1.16.0",
     "@types/webpack-hot-middleware": "2.25.6",
@@ -193,6 +196,7 @@
     "danger": "^11.0.0",
     "dedent": "0.7.0",
     "del": "6.0.0",
+    "dotparser": "1.1.1",
     "enhanced-resolve": "5.8.2",
     "enquirer": "2.3.6",
     "enzyme": "3.10.0",
@@ -215,9 +219,11 @@
     "extract-comments": "1.1.0",
     "file-loader": "6.2.0",
     "fork-ts-checker-webpack-plugin": "6.1.0",
+    "find-free-port": "2.0.0",
     "fs-extra": "8.1.0",
     "geckodriver": "3.0.2",
     "glob": "7.2.0",
+    "graphviz": "0.0.9",
     "gulp": "4.0.2",
     "gulp-babel": "8.0.0",
     "gulp-cache": "1.1.3",
diff --git a/scripts/api-extractor/tsconfig.json b/scripts/api-extractor/tsconfig.json
new file mode 100644
index 00000000000000..0c85a908fa4a5a
--- /dev/null
+++ b/scripts/api-extractor/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../tsconfig.scripts.json",
+  "compilerOptions": {
+    "types": ["node"]
+  },
+  "include": ["*"]
+}
diff --git a/scripts/babel/index.js b/scripts/babel/index.js
index a9891e8ad9ce1d..7363e8579669ec 100644
--- a/scripts/babel/index.js
+++ b/scripts/babel/index.js
@@ -1,14 +1,17 @@
-const isNodeCaller = caller => {
-  return caller && (caller.name === '@babel/register' || caller.name === 'babel-jest');
+/** @typedef {import('@babel/core').TransformOptions['caller']} Caller */
+
+const isNodeCaller = (/** @type {Caller}*/ caller) => {
+  return Boolean(caller && (caller.name === '@babel/register' || caller.name === 'babel-jest'));
 };
-const isDistCaller = caller => {
+const isDistCaller = (/** @type {Caller}*/ caller) => {
   return !!(caller && caller.name === 'babel-gulp');
 };
-const supportsESM = caller => {
+const supportsESM = (/** @type {Caller}*/ caller) => {
+  // @ts-expect-error - TODO: caller.useESModules api doesn't exists (types/implementation), is this a bug? https://babeljs.io/docs/en/options#caller
   return !!((caller && caller.name === 'babel-loader') || caller.useESModules);
 };
 
-module.exports = api => {
+module.exports = (/** @type {import('@babel/core').ConfigAPI} */ api) => {
   const isDistBundle = api.caller(isDistCaller);
   const isNode = api.caller(isNodeCaller);
   const useESModules = !isNode && api.caller(supportsESM);
diff --git a/scripts/babel/register.js b/scripts/babel/register.js
index ef9066528e851e..9deba5b495e062 100644
--- a/scripts/babel/register.js
+++ b/scripts/babel/register.js
@@ -1,4 +1,3 @@
-// @ts-ignore - @babel/register doesn't ship types
 require('@babel/register')({
   extensions: ['.js', '.ts', '.tsx'],
   ignore: [/node_modules/],
diff --git a/scripts/babel/tsconfig.json b/scripts/babel/tsconfig.json
new file mode 100644
index 00000000000000..0c85a908fa4a5a
--- /dev/null
+++ b/scripts/babel/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../tsconfig.scripts.json",
+  "compilerOptions": {
+    "types": ["node"]
+  },
+  "include": ["*"]
+}
diff --git a/scripts/dependency-graph-generator/index.js b/scripts/dependency-graph-generator/index.js
index c729885139bbe0..fecb8a16bb5539 100644
--- a/scripts/dependency-graph-generator/index.js
+++ b/scripts/dependency-graph-generator/index.js
@@ -1,12 +1,18 @@
 const graphviz = require('graphviz');
-const parser = require('dotparser');
-const readFileSync = require('fs').readFileSync;
-const spawnSync = require('child_process').spawnSync;
-const findGitRoot = require('../monorepo/index').findGitRoot;
-const getDependencies = require('../monorepo/index').getDependencies;
+const parser = /** @type {typeof import('dotparser')['default']}*/ (/** @type {unknown} */ (require('dotparser')));
+const { readFileSync } = require('fs');
+const { spawnSync } = require('child_process');
 const path = require('path');
+const yargs = require('yargs');
+
+/** @typedef {import('yargs').Arguments<{root:string;'include-dev'?:string;'graphviz-path'?:string}>} CliArgs */
+
+const { findGitRoot, getDependencies } = require('../monorepo');
 
 const dotFilePath = path.resolve(__dirname, 'repo-graph.dot');
+/**
+ * @type {string[]}
+ */
 let ignoreDevDependencies = [];
 
 /**
@@ -14,6 +20,7 @@ let ignoreDevDependencies = [];
  *
  * For this utility to work you will actually need to install graphviz on your machine
  * http://www.graphviz.org
+ * @param {CliArgs} argv
  */
 async function main(argv) {
   if (!argv.root) {
@@ -81,8 +88,9 @@ function _parseDotFile(pathToDotFile) {
   const items = parsed[0].children;
   items.forEach(item => {
     if (item.type === 'node_stmt') {
-      graph.addNode(item.node_id.id);
+      graph.addNode(String(item.node_id.id));
     } else {
+      // @ts-expect-error - edge_list doesn't exist  on type definition - is this a bug ?
       graph.addEdge(item.edge_list[0].id, item.edge_list[1].id, { dir: 'forward' });
     }
   });
@@ -130,8 +138,11 @@ function _getSubTree(graph, rootPackage) {
  * @param {string} node id of the node
  */
 function _getEdgesAndChildren(graph, node) {
+  /** @type any[] */
   const edges = [];
+  /** @type any[] */
   const children = [];
+  // @ts-expect-error - edges prop doesn't exist on typings - wrong typings ?
   graph.edges.forEach(edge => {
     if (ignoreDevDependencies.includes(edge.nodeOne.id) || ignoreDevDependencies.includes(edge.nodeTwo.id)) {
       return;
@@ -146,7 +157,7 @@ function _getEdgesAndChildren(graph, node) {
   return { edges, children };
 }
 
-require('yargs')
+yargs
   .scriptName('dependency-graph-generator')
   .usage('$0 [args]')
   .command(
@@ -168,7 +179,7 @@ require('yargs')
           description: 'The path to graphviz which needs to be installed, required for windows users',
         });
     },
-    async argv => await main(argv),
+    async argv => await main(/** @type {CliArgs}*/ (argv)),
   )
   .demand('root')
   .help().argv;
diff --git a/scripts/dependency-graph-generator/tsconfig.json b/scripts/dependency-graph-generator/tsconfig.json
new file mode 100644
index 00000000000000..0c85a908fa4a5a
--- /dev/null
+++ b/scripts/dependency-graph-generator/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../tsconfig.scripts.json",
+  "compilerOptions": {
+    "types": ["node"]
+  },
+  "include": ["*"]
+}
diff --git a/scripts/jest/index.js b/scripts/jest/index.js
index a23a4265106eb3..13768877335f77 100644
--- a/scripts/jest/index.js
+++ b/scripts/jest/index.js
@@ -1,8 +1,7 @@
-// @ts-check
 const lernaAlias = require('../lernaAliasNorthstar');
 const findGitRoot = require('../monorepo/findGitRoot');
 
-module.exports = customConfig => ({
+module.exports = (/** @type {import('@jest/types').Config.InitialOptions} */ customConfig) => ({
   coverageDirectory: './coverage/',
   coverageReporters: ['json', 'lcov'],
   moduleFileExtensions: ['ts', 'tsx', 'js', 'json'],
diff --git a/scripts/jest/jest-reporter.js b/scripts/jest/jest-reporter.js
index 9780b0b02f6120..edffa1d8c95d88 100644
--- a/scripts/jest/jest-reporter.js
+++ b/scripts/jest/jest-reporter.js
@@ -13,7 +13,7 @@ class JestReporter extends DefaultReporter {
     super(...args);
 
     this._isLoggingError = false;
-    this.log = message => {
+    this.log = (/** @type {string} */ message) => {
       if (this._isLoggingError) {
         process.stderr.write(message + '\n');
       } else {
diff --git a/scripts/jest/jest-resources.js b/scripts/jest/jest-resources.js
index 9c21cf68ab8d01..4f5b9c10100df0 100644
--- a/scripts/jest/jest-resources.js
+++ b/scripts/jest/jest-resources.js
@@ -1,20 +1,20 @@
-// @ts-check
-
 const fs = require('fs-extra');
 const path = require('path');
-const merge = require('../tasks/merge');
 const resolve = require('resolve');
 const { resolveCwd } = require('just-scripts');
-const { findRepoDeps } = require('../monorepo/index');
+
+const merge = require('../tasks/merge');
+const { findRepoDeps } = require('../monorepo');
 const findConfig = require('../find-config');
 
-const packageJsonPath = findConfig('package.json');
+const packageJsonPath = findConfig('package.json') ?? '';
 const packageRoot = path.dirname(packageJsonPath);
 
 const jestAliases = () => {
   // Get deps of the current package within the repo
   const packageDeps = findRepoDeps();
 
+  /** @type {Record<string,string>} */
   const aliases = {};
 
   for (const { packageJson } of packageDeps) {
diff --git a/scripts/jest/jest-setup.js b/scripts/jest/jest-setup.js
index 2746eb3135b53a..9a83be192a6e5d 100644
--- a/scripts/jest/jest-setup.js
+++ b/scripts/jest/jest-setup.js
@@ -19,6 +19,11 @@ const consoleError = console.error;
 console.error = customError.bind(null, 'error');
 console.warn = customError.bind(null, 'warn');
 
+/**
+ *
+ * @param {string} type
+ * @param  {any[]} args
+ */
 function customError(type, ...args) {
   if (type === 'warn') {
     consoleWarn(...args);
diff --git a/scripts/jest/tsconfig.json b/scripts/jest/tsconfig.json
new file mode 100644
index 00000000000000..4031d4e78fd112
--- /dev/null
+++ b/scripts/jest/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../tsconfig.scripts.json",
+  "compilerOptions": {
+    "types": ["node", "jest"]
+  },
+  "include": ["*"]
+}
diff --git a/scripts/logging.js b/scripts/logging.js
index dec1e9d5b59bcc..46c8d6556ab522 100644
--- a/scripts/logging.js
+++ b/scripts/logging.js
@@ -3,10 +3,22 @@ const chalk = require('chalk');
 const isProduction = process.argv.indexOf('--production') > -1;
 const isVerbose = process.argv.indexOf('--verbose') > -1;
 
+/**
+ *
+ * @param {string} packageName
+ * @param {string} task
+ */
 module.exports.logStartTask = (packageName, task) => {
   console.log(`${getTimePrefix(packageName)} Starting: ${chalk.cyan(task)}`);
 };
 
+/**
+ *
+ * @param {string} packageName
+ * @param {string} task
+ * @param {number} startTime
+ * @param {string} errorMessage
+ */
 module.exports.logEndTask = (packageName, task, startTime, errorMessage) => {
   console.log(
     `${getTimePrefix(packageName)} ${getPassFail(errorMessage === undefined)}: ${chalk.cyan(task)} (${getDuration(
@@ -15,12 +27,22 @@ module.exports.logEndTask = (packageName, task, startTime, errorMessage) => {
   );
 };
 
+/**
+ *
+ * @param {unknown} taskStatus
+ */
 module.exports.logStatus = taskStatus => {
   if (isProduction || isVerbose) {
     console.log('  ' + taskStatus);
   }
 };
 
+/**
+ *
+ * @param {string} packageName
+ * @param {boolean} passed
+ * @param {number} startTime
+ */
 module.exports.logEndBuild = (packageName, passed, startTime) => {
   console.log();
   console.log(
@@ -43,19 +65,40 @@ module.exports.logEndBuild = (packageName, passed, startTime) => {
   );
 };
 
+/**
+ *
+ * @param {number} startTime
+ * @returns
+ */
 function getDuration(startTime) {
   let duration = new Date().getTime() - startTime;
 
   return chalk.yellow(formatTime(duration));
 }
+
+/**
+ *
+ * @param {boolean} passed
+ * @returns
+ */
 function getPassFail(passed) {
   return passed ? chalk.green('Pass') : chalk.red('Error');
 }
 
+/**
+ *
+ * @param {string} packageName
+ * @returns
+ */
 function getTimePrefix(packageName) {
   return `[${chalk.magenta(packageName)} ${chalk.gray(new Date().toLocaleTimeString([], { hour12: false }))}]`;
 }
 
+/**
+ *
+ * @param {number} milliseconds
+ * @returns
+ */
 function formatTime(milliseconds) {
   if (milliseconds >= 1000) {
     return milliseconds / 1000 + 's';
diff --git a/scripts/package.json b/scripts/package.json
index e8890ba34e7595..85da64548204a3 100644
--- a/scripts/package.json
+++ b/scripts/package.json
@@ -27,9 +27,6 @@
     "connect-history-api-fallback": "^1.3.0",
     "doctoc": "^2.0.1",
     "doctrine": "^3.0.0",
-    "dotparser": "^1.0.0",
-    "find-free-port": "~2.0.0",
-    "graphviz": "^0.0.9",
     "inquirer": "^7.3.3",
     "lerna-alias": "^3.0.3-0",
     "lerna-dependency-graph": "^1.0.2",
diff --git a/scripts/tasks/api-extractor.ts b/scripts/tasks/api-extractor.ts
index dcebe9becf3ee4..109d138cbdb6e8 100644
--- a/scripts/tasks/api-extractor.ts
+++ b/scripts/tasks/api-extractor.ts
@@ -112,7 +112,7 @@ export function apiExtractor() {
                 }
               },
               onConfigLoaded: config => {
-                if (!isUsingTsSolutionConfigs) {
+                if (!(isUsingTsSolutionConfigs && tsConfig)) {
                   return;
                 }
 
diff --git a/scripts/tasks/argv.ts b/scripts/tasks/argv.ts
index 96c186882a93ba..f91f77e4f91b73 100644
--- a/scripts/tasks/argv.ts
+++ b/scripts/tasks/argv.ts
@@ -36,7 +36,7 @@ function parseModule(args: Arguments & { module?: string | string[] }) {
         );
       }
 
-      acc[outputType] = true;
+      acc[outputType as keyof JustArgs['module']] = true;
 
       return acc;
     },
diff --git a/scripts/tasks/babel.ts b/scripts/tasks/babel.ts
index 5ab16fc7575ec4..34be991fa02721 100644
--- a/scripts/tasks/babel.ts
+++ b/scripts/tasks/babel.ts
@@ -1,4 +1,4 @@
-import { transformAsync } from '@babel/core';
+import { BabelFileResult, transformAsync } from '@babel/core';
 import * as glob from 'glob';
 import fs from 'fs';
 import { logger } from 'just-task';
@@ -20,7 +20,7 @@ export async function babel() {
     const codeBuffer = await fs.promises.readFile(filePath);
     const sourceCode = codeBuffer.toString().replace(EOL_REGEX, '\n');
 
-    const result = await transformAsync(sourceCode, {
+    const result = (await transformAsync(sourceCode, {
       ast: false,
       sourceMaps: true,
 
@@ -32,7 +32,7 @@ export async function babel() {
       filename: filePath,
 
       sourceFileName: path.basename(filename),
-    });
+    })) /* Bad `transformAsync` types. it can be null only if 2nd param is null(config)*/ as NonNullableRecord<BabelFileResult>;
     const resultCode = addSourceMappingUrl(result.code, path.basename(filename) + '.map');
 
     if (resultCode === sourceCode) {
@@ -48,3 +48,7 @@ export async function babel() {
     await fs.promises.writeFile(sourceMapFile, JSON.stringify(result.map));
   }
 }
+
+type NonNullableRecord<T> = {
+  [P in keyof T]-?: NonNullable<T[P]>;
+};
diff --git a/scripts/tasks/bundle-size-collect.ts b/scripts/tasks/bundle-size-collect.ts
index 6b1ea46dbed94a..ebac469be4393f 100644
--- a/scripts/tasks/bundle-size-collect.ts
+++ b/scripts/tasks/bundle-size-collect.ts
@@ -10,7 +10,7 @@ export function bundleSizeCollect() {
   // information which gets reported by Size Auditor
 
   const distRoot = path.join(__dirname, '../../apps/test-bundles/dist');
-  const sizes = {};
+  const sizes: Record<string, number> = {};
   const outputFilename = 'bundlesize.json';
 
   var items = fs.readdirSync(distRoot);
@@ -25,11 +25,11 @@ export function bundleSizeCollect() {
 
   fs.writeFileSync(path.join(distRoot, outputFilename), JSON.stringify({ sizes }));
 
-  function getFilesizeInBytes(fileName) {
+  function getFilesizeInBytes(fileName: string) {
     return fs.statSync(fileName).size;
   }
 
-  function getComponentName(fileName) {
+  function getComponentName(fileName: string) {
     return path.basename(fileName, '.min.js');
   }
 }
diff --git a/scripts/tasks/copy.ts b/scripts/tasks/copy.ts
index d4a5035f3f8e48..b90aee3bc6fdb6 100644
--- a/scripts/tasks/copy.ts
+++ b/scripts/tasks/copy.ts
@@ -4,7 +4,7 @@ import { series, resolveCwd, copyTask, copyInstructionsTask, logger } from 'just
 import { getProjectMetadata, findGitRoot } from '../monorepo';
 import { getTsPathAliasesConfig } from './utils';
 
-export function expandSourcePath(pattern: string): string {
+export function expandSourcePath(pattern: string): string | null {
   if (!pattern) {
     return null;
   }
@@ -29,6 +29,7 @@ export function expandSourcePath(pattern: string): string {
     return pattern.replace(packageName, path.dirname(resolvedPackageJson));
   } catch (e) {
     console.error(e);
+    return null;
   }
 }
 
@@ -42,7 +43,7 @@ export function copyCompiled() {
 
   const packageDir = process.cwd();
 
-  if (!isUsingTsSolutionConfigs) {
+  if (!(isUsingTsSolutionConfigs && tsConfig)) {
     throw new Error(`this task compliant only with packages that use TS solution config files.`);
   }
 
@@ -57,6 +58,13 @@ export function copyCompiled() {
 
   const projectMetadata = getProjectMetadata({ root, name: packageJson.name });
 
+  if (!projectMetadata.sourceRoot) {
+    throw new Error(`${packageJson.name} is missing 'sourceRoot' in workspace.json`);
+  }
+  if (!packageJson.module) {
+    throw new Error(`${packageJson.name} is missing 'module' property in package.json`);
+  }
+
   const paths = {
     esm: {
       in: path.join(
@@ -110,7 +118,7 @@ export function copy() {
 
     if (Array.isArray(sources)) {
       return copyTask({
-        paths: sources.map(src => expandSourcePath(src)),
+        paths: sources.map(src => expandSourcePath(src)).filter(Boolean) as string[],
         dest: destinationPath,
       });
     }
diff --git a/scripts/tasks/generate-version-files.ts b/scripts/tasks/generate-version-files.ts
index c8d7054b392613..f0ffc54a6d1580 100644
--- a/scripts/tasks/generate-version-files.ts
+++ b/scripts/tasks/generate-version-files.ts
@@ -9,7 +9,7 @@ const beachballBin = require.resolve('beachball/bin/beachball.js');
 const bumpCmd = [process.execPath, beachballBin, 'bump'];
 const gitRoot = findGitRoot();
 
-function run(args) {
+function run(args: string[]) {
   const [cmd, ...restArgs] = args;
   const runResult = spawnSync(cmd, restArgs, { cwd: gitRoot });
   if (runResult.status === 0) {
@@ -59,7 +59,7 @@ export function generateVersionFiles() {
   }
 
   // 2. gather version info
-  const updatedVersionContents = {};
+  const updatedVersionContents: Record<string, string> = {};
   const packageJsons = glob.sync('+(packages|apps)/*/package.json', { cwd: gitRoot });
   packageJsons.forEach(packageJsonPath => {
     const versionFile = path.join(gitRoot, path.dirname(packageJsonPath), 'src/version.ts');
diff --git a/scripts/tasks/lint-imports.ts b/scripts/tasks/lint-imports.ts
index 6dab2dda2092af..8bdd6c1bf3ef09 100644
--- a/scripts/tasks/lint-imports.ts
+++ b/scripts/tasks/lint-imports.ts
@@ -1,4 +1,4 @@
-import { getAllPackageInfo, findGitRoot } from '../monorepo/index';
+import { getAllPackageInfo, findGitRoot } from '../monorepo';
 import { readConfig } from '../read-config';
 import * as glob from 'glob';
 import * as path from 'path';
@@ -119,7 +119,7 @@ export function lintImports() {
       if (!exportStatements) {
         _addError(importErrors.exportMulti, relativePath, 'no exported class or const');
       } else if (exportStatements.length > 1) {
-        const exports = exportStatements.map(exp => exp.match(exportRegex)[2]);
+        const exports = exportStatements.map(exp => (exp.match(exportRegex) as RegExpMatchArray)[2]);
         _addError(importErrors.exportMulti, relativePath, 'choose one of ' + exports.join(', '));
       }
 
@@ -144,10 +144,10 @@ export function lintImports() {
     const importPath = importMatch[2];
     const packageRootPath = importPath.split('/')[0];
     const relativePath = path.relative(sourcePath, filePath);
-    let fullImportPath: string;
+    let fullImportPath: string | undefined;
     let pathIsRelative = false;
     let pathIsDeep = false;
-    let pkgName: string;
+    let pkgName: string | undefined = undefined;
 
     if (importPath[0] === '.') {
       // import is a file path. is this a file?
@@ -211,12 +211,15 @@ export function lintImports() {
         _addError(importErrors.pathDeep, relativePath, importPath);
       }
 
-      if (reExportedPackages[pkgName] && !allowedReexportedImports.includes(importPath)) {
+      if (
+        reExportedPackages[pkgName as keyof typeof reExportedPackages] &&
+        !allowedReexportedImports.includes(importPath)
+      ) {
         _addError(
           importErrors.pathReExported,
           relativePath,
           importPath,
-          '@fluentui/react/lib/' + reExportedPackages[pkgName],
+          '@fluentui/react/lib/' + reExportedPackages[pkgName as keyof typeof reExportedPackages],
         );
       }
 
@@ -238,7 +241,7 @@ export function lintImports() {
       }
     }
 
-    return undefined;
+    return;
   }
 
   function _addError(errorGroup: ImportErrorGroup, relativePath: string, importPath: string, alternative?: string) {
@@ -270,7 +273,7 @@ export function lintImports() {
     };
 
     let hasError = false;
-    for (const groupName of Object.keys(importErrors)) {
+    for (const groupName of Object.keys(importErrors) as Array<keyof ImportErrors>) {
       const errorGroup: ImportErrorGroup = importErrors[groupName];
       if (errorGroup.count) {
         hasError = true;
diff --git a/scripts/tasks/merge.js b/scripts/tasks/merge.js
index c8c6846bd80038..5b5f94f30cf997 100644
--- a/scripts/tasks/merge.js
+++ b/scripts/tasks/merge.js
@@ -1,4 +1,11 @@
-module.exports = function merge(obj1, obj2) {
+module.exports = merge;
+
+/**
+ *
+ * @param {Record<string,any>} obj1
+ * @param {Record<string,any>} obj2
+ */
+function merge(obj1, obj2) {
   const merged = Object.assign({}, obj1);
 
   for (const prop in obj2) {
@@ -15,4 +22,4 @@ module.exports = function merge(obj1, obj2) {
   }
 
   return merged;
-};
+}
diff --git a/scripts/tasks/sass.ts b/scripts/tasks/sass.ts
index 999501e00b779c..b247098714619b 100644
--- a/scripts/tasks/sass.ts
+++ b/scripts/tasks/sass.ts
@@ -3,7 +3,7 @@ import * as glob from 'glob';
 import { sassTask } from 'just-scripts';
 import postcssModules from 'postcss-modules';
 
-const _fileNameToClassMap = {};
+const _fileNameToClassMap: Record<string, Record<string, string>> = {};
 
 function createTypeScriptModule(fileName: string, css: string) {
   const { splitStyles } = require('@microsoft/load-themed-styles');
diff --git a/scripts/tasks/storybook.ts b/scripts/tasks/storybook.ts
index 4ee09dd372512d..cc141060edabcb 100644
--- a/scripts/tasks/storybook.ts
+++ b/scripts/tasks/storybook.ts
@@ -1,9 +1,14 @@
 import { argv } from 'just-scripts';
 import * as fs from 'fs';
 import * as path from 'path';
-import { findGitRoot } from '../monorepo/index';
+import { findGitRoot } from '../monorepo';
 
-import storybook from '@storybook/react/standalone';
+// TODO: this should be replaced with `'@storybook/core-server';` API
+// @ts-expect-error - standalone.js is basically private API/thus doesn't ship types. NOTE: Storybook can be run standalone from Node, although it should be noted this isn't officially supported any more. - https://github.com/storybookjs/storybook/blob/master/lib/core/docs/standalone.md#standalone-mode
+import _storybook from '@storybook/react/standalone';
+const storybook: StorybookStandaloneBuildFn = _storybook;
+
+type StorybookStandaloneBuildFn = (options?: StorybookDevOptions | StorybookStaticOptions) => Promise<void>;
 
 // Option types are documented here but not included in package for some reason
 // https://github.com/storybookjs/storybook/blob/master/lib/core/docs/standalone.md
diff --git a/scripts/tasks/ts.ts b/scripts/tasks/ts.ts
index 652f96151fcdc2..30a3e54b941dfc 100644
--- a/scripts/tasks/ts.ts
+++ b/scripts/tasks/ts.ts
@@ -24,7 +24,7 @@ function prepareTsTaskConfig(options: TscTaskOptions) {
 
   const { isUsingTsSolutionConfigs, tsConfigFile, tsConfig } = getTsPathAliasesConfig();
 
-  if (isUsingTsSolutionConfigs) {
+  if (isUsingTsSolutionConfigs && tsConfig) {
     logger.info(`📣 TSC: package is using TS path aliases. Overriding tsconfig settings.`);
 
     const tsConfigOutDir = tsConfig.compilerOptions.outDir as string;
diff --git a/scripts/tasks/tsconfig.json b/scripts/tasks/tsconfig.json
new file mode 100644
index 00000000000000..9dc1fd8575760c
--- /dev/null
+++ b/scripts/tasks/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../tsconfig.scripts.json",
+  "compilerOptions": {
+    "types": ["node", "jest"]
+  },
+  "include": ["*"],
+  "files": ["../../typings/find-free-port/index.d.ts"]
+}
diff --git a/scripts/tsconfig.json b/scripts/tsconfig.json
index 923f9a4c7d0d98..07ba9e5936b901 100644
--- a/scripts/tsconfig.json
+++ b/scripts/tsconfig.json
@@ -24,6 +24,15 @@
     "./prettier/**",
     "./fluentui-publish/**",
     "./puppeteer/**",
-    "./triage-bot/**"
+    "./triage-bot/**",
+    "./webpack/**",
+    "./jest/**",
+    "./dependency-graph-generator/**",
+    "./typescript/**",
+    "./tasks/**",
+    "./babel/**",
+    "./api-extractor/**",
+    "./typescript/**",
+    "./lint-staged/**"
   ]
 }
diff --git a/scripts/tsconfig.scripts.json b/scripts/tsconfig.scripts.json
index c87a04ae385929..7c707022600a74 100644
--- a/scripts/tsconfig.scripts.json
+++ b/scripts/tsconfig.scripts.json
@@ -11,6 +11,30 @@
   "include": [],
   "files": [],
   "references": [
+    {
+      "path": "./api-extractor/tsconfig.json"
+    },
+    {
+      "path": "./babel/tsconfig.json"
+    },
+    {
+      "path": "./lint-staged/tsconfig.json"
+    },
+    {
+      "path": "./typescript/tsconfig.json"
+    },
+    {
+      "path": "./tasks/tsconfig.json"
+    },
+    {
+      "path": "./jest/tsconfig.json"
+    },
+    {
+      "path": "./webpack/tsconfig.json"
+    },
+    {
+      "path": "./dependency-graph-generator/tsconfig.json"
+    },
     {
       "path": "./triage-bot/tsconfig.json"
     },
diff --git a/scripts/typescript/normalize-import.js b/scripts/typescript/normalize-import.js
index 0cd5a0c1fd69af..602dedbee3dc5a 100644
--- a/scripts/typescript/normalize-import.js
+++ b/scripts/typescript/normalize-import.js
@@ -1,5 +1,3 @@
-// @ts-check
-
 const fs = require('fs');
 const path = require('path');
 const chalk = require('chalk');
diff --git a/scripts/typescript/normalize-import.spec.js b/scripts/typescript/normalize-import.spec.js
index bc44796963d5a4..f82b733a94ac8b 100644
--- a/scripts/typescript/normalize-import.spec.js
+++ b/scripts/typescript/normalize-import.spec.js
@@ -1,5 +1,3 @@
-// @ts-check
-
 const { execSync } = require('child_process');
 const fs = require('fs');
 const path = require('path');
diff --git a/scripts/typescript/tsconfig.json b/scripts/typescript/tsconfig.json
new file mode 100644
index 00000000000000..4031d4e78fd112
--- /dev/null
+++ b/scripts/typescript/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../tsconfig.scripts.json",
+  "compilerOptions": {
+    "types": ["node", "jest"]
+  },
+  "include": ["*"]
+}
diff --git a/scripts/webpack/getDefaultEnvironmentVars.js b/scripts/webpack/getDefaultEnvironmentVars.js
index 12c0a198e613ba..44b787e549829d 100644
--- a/scripts/webpack/getDefaultEnvironmentVars.js
+++ b/scripts/webpack/getDefaultEnvironmentVars.js
@@ -9,10 +9,11 @@
  * Helper which resolves a specific set of environment variable values. If not present,
  * the provided default values will be returned.
  *
- * @param options - A object where the keys are the environment variables to read,
+ * @param {Record<string,string>} options - A object where the keys are the environment variables to read,
  * and their values represent the default value to use if the variable is not present.
  */
 const getVariables = options => {
+  /** @type {Record<string,string>} */
   const variables = {};
 
   for (const key of Object.keys(options)) {
@@ -28,9 +29,9 @@ const getVariables = options => {
  * Function which returns DefinePlugin options for a specific set of environment variables.
  * This is needed because Webpack 5 no longer automatically resolves process.env values.
  *
- * @param {boolean=} isProduction - If true will ensure NODE_ENV is 'production', even
+ * @param {boolean} [isProduction] - If true will ensure NODE_ENV is 'production', even
  * if environment variables specify otherwise.
- * @param {object=} otherValues - Other values to include in the environment. Key is the
+ * @param {Record<string,string>} [otherValues] - Other values to include in the environment. Key is the
  * environment variable name and value is the non-stringified value.
  */
 module.exports = (isProduction, otherValues) => ({
diff --git a/scripts/webpack/getResolveAlias.js b/scripts/webpack/getResolveAlias.js
index 6afd0c7b2ac10c..d96cc20127b803 100644
--- a/scripts/webpack/getResolveAlias.js
+++ b/scripts/webpack/getResolveAlias.js
@@ -1,7 +1,6 @@
-// @ts-check
 const path = require('path');
 
-const { findRepoDeps, findGitRoot } = require('../monorepo/index');
+const { findRepoDeps, findGitRoot } = require('../monorepo');
 const { readConfig } = require('../read-config');
 
 /**
@@ -87,7 +86,6 @@ function getResolveAlias(useLib, cwd) {
 
 module.exports = getResolveAlias;
 
-// @ts-ignore
 if (require.main === module) {
   console.log(getResolveAlias());
 }
diff --git a/scripts/webpack/tsconfig.json b/scripts/webpack/tsconfig.json
new file mode 100644
index 00000000000000..0c85a908fa4a5a
--- /dev/null
+++ b/scripts/webpack/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../tsconfig.scripts.json",
+  "compilerOptions": {
+    "types": ["node"]
+  },
+  "include": ["*"]
+}
diff --git a/scripts/webpack/webpack-resources.js b/scripts/webpack/webpack-resources.js
index d07f8afd746268..79451d435de394 100644
--- a/scripts/webpack/webpack-resources.js
+++ b/scripts/webpack/webpack-resources.js
@@ -1,23 +1,21 @@
-// @ts-check
-
 /**
  * @typedef {import("webpack").Configuration} WebpackConfig
  * @typedef {WebpackConfig & { devServer?: object }} WebpackServeConfig
  * @typedef {import("webpack").ModuleOptions} WebpackModule
  * @typedef {import("webpack").Configuration['output']} WebpackOutput
  */
-/** */
+
 const webpack = require('webpack');
 const path = require('path');
 const fs = require('fs');
-/** @type {(c1: Partial<WebpackServeConfig>, c2: Partial<WebpackServeConfig>) => WebpackServeConfig} */
-const merge = require('../tasks/merge');
 const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
+// @ts-ignore - accessing package.json is a private API access, thus ignoring TS here
+const webpackVersion = /** @type {string} */ (require('webpack/package.json').version);
+
+const merge = require('../tasks/merge');
+const { findGitRoot } = require('../monorepo');
 const getResolveAlias = require('./getResolveAlias');
-const { findGitRoot } = require('../monorepo/index');
 
-// @ts-ignore
-const webpackVersion = require('webpack/package.json').version;
 const getDefaultEnvironmentVars = require('./getDefaultEnvironmentVars');
 
 console.log(`Webpack version: ${webpackVersion}`);
@@ -318,8 +316,16 @@ module.exports = {
   },
 };
 
+/**
+ *
+ * @param {string} bundleName
+ * @param {boolean} isProduction
+ * @param {boolean} [profile]
+ * @returns
+ */
 function getPlugins(bundleName, isProduction, profile) {
   const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
+  /** @type {webpack.WebpackPluginInstance[]} */
   const plugins = [new webpack.DefinePlugin(getDefaultEnvironmentVars(isProduction))];
 
   if (isProduction && profile) {
diff --git a/scripts/webpack/webpack.config.stats.ts b/scripts/webpack/webpack.config.stats.ts
index cca7e39792c117..27dcf8ea167fa6 100644
--- a/scripts/webpack/webpack.config.stats.ts
+++ b/scripts/webpack/webpack.config.stats.ts
@@ -15,18 +15,19 @@ const { paths } = config;
 // ERROR:    https://github.com/webpack/webpack/issues/7378
 // HACK FIX: https://github.com/TypeStrong/ts-loader/issues/653
 class IgnoreNotFoundExportPlugin {
-  apply(compiler) {
+  apply(compiler: webpack.Compiler) {
     const messageRegExp = /export '.*'( \(reexported as '.*'\))? was not found in/;
 
-    const doneHook = stats => {
+    const doneHook = (stats: any) => {
       stats.compilation.warnings = stats.compilation.warnings.filter(
-        warn => !(warn && messageRegExp.test(warn.message)),
+        (warn: any) => !(warn && messageRegExp.test(warn.message)),
       );
     };
 
     if (compiler.hooks) {
       compiler.hooks.done.tap('IgnoreNotFoundExportPlugin', doneHook);
     } else {
+      // @ts-expect-error - TODO: this api is non existent thus this probably doesn't work anymore ?
       compiler.plugin('done', doneHook);
     }
   }
@@ -60,23 +61,25 @@ const makeConfig = (srcPath: string, name: string): webpack.Configuration => ({
     react: 'react',
     'react-dom': 'reactDOM',
   },
-  ...(argv.debug && {
-    optimization: {
-      minimizer: [
-        new TerserWebpackPlugin({
-          parallel: true,
-          terserOptions: {
-            mangle: false,
-            output: {
-              beautify: true,
-              comments: true,
-              preserve_annotations: true,
-            },
-          },
-        }),
-      ],
-    },
-  }),
+  ...(argv.debug
+    ? {
+        optimization: {
+          minimizer: [
+            new TerserWebpackPlugin({
+              parallel: true,
+              terserOptions: {
+                mangle: false,
+                output: {
+                  beautify: true,
+                  comments: true,
+                  preserve_annotations: true,
+                },
+              },
+            }),
+          ],
+        },
+      }
+    : null),
   plugins: [
     new CleanWebpackPlugin(),
     new IgnoreNotFoundExportPlugin(),
@@ -94,7 +97,7 @@ const makeConfig = (srcPath: string, name: string): webpack.Configuration => ({
   },
 });
 
-const toEsDistPath = srcPath => {
+const toEsDistPath = (srcPath: string) => {
   return paths.packageDist('react-northstar', path.join('es', srcPath));
 };
 
diff --git a/scripts/webpack/webpack.config.ts b/scripts/webpack/webpack.config.ts
index ed1f0603226f89..01634fa9c2b711 100644
--- a/scripts/webpack/webpack.config.ts
+++ b/scripts/webpack/webpack.config.ts
@@ -13,10 +13,11 @@ import getDefaultEnvironmentVars from './getDefaultEnvironmentVars';
 const { paths } = config;
 const { __DEV__, __PERF__, __PROD__ } = config.compiler_globals;
 
-const webpackConfig: webpack.Configuration = {
+const webpackConfig: webpack.Configuration &
+  Required<Pick<webpack.Configuration, 'plugins' | 'optimization'>> & { entry: Record<string, string | string[]> } = {
   name: 'client',
   target: 'web',
-  mode: config.compiler_mode,
+  mode: config.compiler_mode!,
   entry: {
     app: paths.docsSrc('index'),
   },
@@ -109,16 +110,17 @@ const webpackConfig: webpack.Configuration = {
     }),
     new webpack.ContextReplacementPlugin(/moment[/\\]locale$/, /en/),
     __DEV__ &&
-      // Disable ProgressPlugin in CI and multi-project build because the outdated lines can't be deleted and
-      // spam the log (note that build:docs is the resolved command used by lerna run build --stream)
-      !process.env.TF_BUILD &&
-      !process.argv.includes('build:docs') &&
-      new webpack.ProgressPlugin({
-        entries: true,
-        modules: true,
-        modulesCount: 500,
-      } as any),
-  ].filter(Boolean),
+    // Disable ProgressPlugin in CI and multi-project build because the outdated lines can't be deleted and
+    // spam the log (note that build:docs is the resolved command used by lerna run build --stream)
+    !process.env.TF_BUILD &&
+    !process.argv.includes('build:docs')
+      ? new webpack.ProgressPlugin({
+          entries: true,
+          modules: true,
+          modulesCount: 500,
+        })
+      : null,
+  ].filter(Boolean) as webpack.WebpackPluginInstance[],
   resolve: {
     extensions: ['.ts', '.tsx', '.js', '.json'],
     alias: {
@@ -165,8 +167,9 @@ if (__DEV__) {
     },
     (val, key) => `&${key}=${val}`,
   ).join('')}`;
-  const entry = webpackConfig.entry as webpack.EntryObject;
-  entry.app = [webpackHotMiddlewareEntry].concat(entry.app as string);
+  const entry = webpackConfig.entry;
+
+  entry.app = [webpackHotMiddlewareEntry].concat(entry.app);
 
   webpackConfig.plugins.push(new webpack.HotModuleReplacementPlugin(), new webpack.NoEmitOnErrorsPlugin());
 }
diff --git a/typings/find-free-port/index.d.ts b/typings/find-free-port/index.d.ts
new file mode 100644
index 00000000000000..85bdaa08eb2c06
--- /dev/null
+++ b/typings/find-free-port/index.d.ts
@@ -0,0 +1,8 @@
+// Type definitions for find-free-port 2.0.0
+
+declare module 'find-free-port' {
+  function findFreePort(args: [...values: Array<string | number>, cb: (err: unknown, freePort: number) => void]): any;
+  function findFreePort(...args: Array<string | number>): Promise<number>;
+
+  export default findFreePort;
+}
diff --git a/typings/find-free-port/tsconfig.json b/typings/find-free-port/tsconfig.json
new file mode 100644
index 00000000000000..c6f8b0a935c4c2
--- /dev/null
+++ b/typings/find-free-port/tsconfig.json
@@ -0,0 +1,5 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {},
+  "include": ["*.d.ts"]
+}
diff --git a/typings/tsconfig.json b/typings/tsconfig.json
index 7187a8f9e2b2ac..d2324f1f1c570d 100644
--- a/typings/tsconfig.json
+++ b/typings/tsconfig.json
@@ -27,6 +27,9 @@
     },
     {
       "path": "./json-stable-stringify-without-jsonify/tsconfig.json"
+    },
+    {
+      "path": "./find-free-port/tsconfig.json"
     }
   ]
 }
diff --git a/yarn.lock b/yarn.lock
index 0ffd9c3a0d8e15..48a448c922b811 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5308,6 +5308,13 @@
   dependencies:
     "@types/babel__core" "*"
 
+"@types/babel__register@7.17.0":
+  version "7.17.0"
+  resolved "https://registry.yarnpkg.com/@types/babel__register/-/babel__register-7.17.0.tgz#fcb3ee6bfe9314215a0af5de7d9f19faf4144e50"
+  integrity sha512-/iL2G2eq5drPFQpzb/wMYk7B0LMWRpWajnPn1XuIzeQ2w+CRrzNbwJ5xpBdZkciYx0jqZa8h40dTXpMeTcGV7A==
+  dependencies:
+    "@types/babel__core" "*"
+
 "@types/babel__template@*":
   version "7.0.2"
   resolved "https://registry.yarnpkg.com/@types/babel__template/-/babel__template-7.0.2.tgz#4ff63d6b52eddac1de7b975a5223ed32ecea9307"
@@ -5713,6 +5720,13 @@
   dependencies:
     "@types/node" "*"
 
+"@types/graphviz@0.0.34":
+  version "0.0.34"
+  resolved "https://registry.yarnpkg.com/@types/graphviz/-/graphviz-0.0.34.tgz#40657ce27383e3bd36bea6a4b7449866f3caa8eb"
+  integrity sha512-5pyobgT+/NhwKy/LMLw14xFInvYXBPx4ITc2a5FvZbm6hcudcP73DpTKTlaZbjr8fdNAkaK9KdP8GAEF0iBwlQ==
+  dependencies:
+    "@types/node" "*"
+
 "@types/gulp-babel@6.1.30":
   version "6.1.30"
   resolved "https://registry.yarnpkg.com/@types/gulp-babel/-/gulp-babel-6.1.30.tgz#72220a2e72517bd2cf461fc6250849035ad58798"
@@ -6445,6 +6459,15 @@
     "@types/expect" "^1.20.4"
     "@types/node" "*"
 
+"@types/webpack-bundle-analyzer@4.4.3":
+  version "4.4.3"
+  resolved "https://registry.yarnpkg.com/@types/webpack-bundle-analyzer/-/webpack-bundle-analyzer-4.4.3.tgz#1f8eba759677a3bf094166572fc7debf68161f61"
+  integrity sha512-7+4XhCMxc1XyQr2lwAbEEeWTax+FX70xMeskU0WtxrODczoOZXTo9vrYh/XF7pAOn+NxqR4yRKW5gfz1HHNnfw==
+  dependencies:
+    "@types/node" "*"
+    tapable "^2.2.0"
+    webpack "^5"
+
 "@types/webpack-dev-middleware@4.1.0":
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/@types/webpack-dev-middleware/-/webpack-dev-middleware-4.1.0.tgz#3bf432f2ff2313b6470af21b748dd5d73dba5ec6"
@@ -11909,10 +11932,10 @@ dotenv@~10.0.0:
   resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-10.0.0.tgz#3d4227b8fb95f81096cdd2b66653fb2c7085ba81"
   integrity sha512-rlBi9d8jpv9Sf1klPjNfFAuWDjKLwTIJJ/VxtoTwIR6hnZxcEOQCZg2oIL3MWBYw5GpUDKOEnND7LXTbIpQ03Q==
 
-dotparser@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/dotparser/-/dotparser-1.0.0.tgz#32458fcfa855046705b90df929ed87a849e32304"
-  integrity sha512-yIvKnnQbK8dhh6aN44xNPd00FuHWVygAW8iYW05DCgzGzHJfe/VaQQAoq3QBDAa8cMFS7Lub8SCAsej/lLUomQ==
+dotparser@1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/dotparser/-/dotparser-1.1.1.tgz#c474942f329638b44ddb3dff27e9a6385dbab2f9"
+  integrity sha512-8ojhUts0HbLnXJgjTiJOddwVVBUk6hg4SJ5kGiuhzgK/f+y79TiWvICwx1oCWlVbBC8YI3nEaIQg9fjGYbGBXw==
 
 download@^7.1.0:
   version "7.1.0"
@@ -13762,10 +13785,10 @@ find-cache-dir@^3.3.1:
     make-dir "^3.0.2"
     pkg-dir "^4.1.0"
 
-find-free-port@~2.0.0:
+find-free-port@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/find-free-port/-/find-free-port-2.0.0.tgz#4b22e5f6579eb1a38c41ac6bcb3efed1b6da9b1b"
-  integrity sha1-SyLl9leesaOMQaxryz7+0bbamxs=
+  integrity sha512-J1j8gfEVf5FN4PR5w5wrZZ7NYs2IvqsHcd03cAeQx3Ec/mo+lKceaVNhpsRKoZpZKbId88o8qh+dwUwzBV6WCg==
 
 find-replace@^3.0.0:
   version "3.0.0"
@@ -14975,7 +14998,7 @@ graceful-fs@^4.2.9:
   resolved "https://registry.yarnpkg.com/graceful-readlink/-/graceful-readlink-1.0.1.tgz#4cafad76bc62f02fa039b2f94e9a3dd3a391a725"
   integrity sha1-TK+tdrxi8C+gObL5Tpo906ORpyU=
 
-graphviz@0.0.9, graphviz@^0.0.9:
+graphviz@0.0.9:
   version "0.0.9"
   resolved "https://registry.yarnpkg.com/graphviz/-/graphviz-0.0.9.tgz#0bbf1df588c6a92259282da35323622528c4bbc4"
   integrity sha512-SmoY2pOtcikmMCqCSy2NO1YsRfu9OO0wpTlOYW++giGjfX1a6gax/m1Fo8IdUd0/3H15cTOfR1SMKwohj4LKsg==
@@ -26355,7 +26378,7 @@ terser@5.14.2, terser@^5.3.4, terser@^5.5.1, terser@^5.7.2:
     source-map-support "~0.5.20"
 
 terser@^4.1.2, terser@^4.3.9, terser@^4.6.12, terser@^4.6.2, terser@^4.6.3:
-  version "4.8.1"
+  version "4.8.0"
   resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.0.tgz#63056343d7c70bb29f3af665865a46fe03a0df17"
   integrity sha512-EAPipTNeWsb/3wLPeup1tVPaXfIaU68xMnVdPafIL1TV05OhASArYyIfFvnvJCNrR2NIOvDVNNTFRa+Re2MWyw==
   dependencies: