diff --git a/packages/@n8n_io/eslint-config/base.js b/packages/@n8n_io/eslint-config/base.js
index d244f76855..0f0093b303 100644
--- a/packages/@n8n_io/eslint-config/base.js
+++ b/packages/@n8n_io/eslint-config/base.js
@@ -137,7 +137,7 @@ const config = (module.exports = {
 		/**
 		 * https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/ban-ts-comment.md
 		 */
-		'@typescript-eslint/ban-ts-comment': ['warn', { 'ts-ignore': true }],
+		'@typescript-eslint/ban-ts-comment': ['error', { 'ts-ignore': true }],
 
 		/**
 		 * https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/ban-types.md
diff --git a/packages/cli/.eslintrc.js b/packages/cli/.eslintrc.js
index 35596b779b..07458ac920 100644
--- a/packages/cli/.eslintrc.js
+++ b/packages/cli/.eslintrc.js
@@ -12,5 +12,6 @@ module.exports = {
 	rules: {
 		// TODO: Remove this
 		'import/order': 'off',
+		'@typescript-eslint/ban-ts-comment': ['warn', { 'ts-ignore': true }],
 	},
- };
+};
diff --git a/packages/core/.eslintrc.js b/packages/core/.eslintrc.js
index 4e71be5b40..2055297741 100644
--- a/packages/core/.eslintrc.js
+++ b/packages/core/.eslintrc.js
@@ -6,5 +6,6 @@ module.exports = {
 	rules: {
 		// TODO: Remove this
 		'import/order': 'off',
+		'@typescript-eslint/ban-ts-comment': ['error', { 'ts-ignore': true }],
 	},
 };
diff --git a/packages/core/src/BinaryDataManager/index.ts b/packages/core/src/BinaryDataManager/index.ts
index eeaeee407c..57b9313b53 100644
--- a/packages/core/src/BinaryDataManager/index.ts
+++ b/packages/core/src/BinaryDataManager/index.ts
@@ -4,7 +4,7 @@ import { IBinaryDataConfig, IBinaryDataManager } from '../Interfaces';
 import { BinaryDataFileSystem } from './FileSystem';
 
 export class BinaryDataManager {
-	private static instance: BinaryDataManager;
+	static instance: BinaryDataManager | undefined;
 
 	private managers: {
 		[key: string]: IBinaryDataManager;
diff --git a/packages/core/src/NodeExecuteFunctions.ts b/packages/core/src/NodeExecuteFunctions.ts
index 3ba44c3dcc..78ec4ebc24 100644
--- a/packages/core/src/NodeExecuteFunctions.ts
+++ b/packages/core/src/NodeExecuteFunctions.ts
@@ -77,8 +77,8 @@ import { get } from 'lodash';
 import type { Request, Response } from 'express';
 import FormData from 'form-data';
 import path from 'path';
-import { OptionsWithUri, OptionsWithUrl } from 'request';
-import requestPromise from 'request-promise-native';
+import { OptionsWithUri, OptionsWithUrl, RequestCallback, RequiredUriUrl } from 'request';
+import requestPromise, { RequestPromiseOptions } from 'request-promise-native';
 import { fromBuffer } from 'file-type';
 import { lookup } from 'mime-types';
 
@@ -123,18 +123,16 @@ const requestPromiseWithDefaults = requestPromise.defaults({
 
 const pushFormDataValue = (form: FormData, key: string, value: any) => {
 	if (value?.hasOwnProperty('value') && value.hasOwnProperty('options')) {
-		// @ts-ignore
 		form.append(key, value.value, value.options);
 	} else {
 		form.append(key, value);
 	}
 };
 
-const createFormDataObject = (data: object) => {
+const createFormDataObject = (data: Record<string, unknown>) => {
 	const formData = new FormData();
 	const keys = Object.keys(data);
 	keys.forEach((key) => {
-		// @ts-ignore
 		const formField = data[key];
 
 		if (formField instanceof Array) {
@@ -231,7 +229,7 @@ async function parseRequestObject(requestObject: IDataObject) {
 		if (requestObject.formData !== undefined && requestObject.formData instanceof FormData) {
 			axiosConfig.data = requestObject.formData;
 		} else {
-			const allData = {
+			const allData: Partial<FormData> = {
 				...(requestObject.body as object | undefined),
 				...(requestObject.formData as object | undefined),
 			};
@@ -240,7 +238,6 @@ async function parseRequestObject(requestObject: IDataObject) {
 		}
 		// replace the existing header with a new one that
 		// contains the boundary property.
-		// @ts-ignore
 		delete axiosConfig.headers[contentTypeHeaderKeyName];
 		const headers = axiosConfig.data.getHeaders();
 		axiosConfig.headers = Object.assign(axiosConfig.headers || {}, headers);
@@ -276,7 +273,7 @@ async function parseRequestObject(requestObject: IDataObject) {
 			if (requestObject.formData instanceof FormData) {
 				axiosConfig.data = requestObject.formData;
 			} else {
-				axiosConfig.data = createFormDataObject(requestObject.formData as object);
+				axiosConfig.data = createFormDataObject(requestObject.formData as Record<string, unknown>);
 			}
 			// Mix in headers as FormData creates the boundary.
 			const headers = axiosConfig.data.getHeaders();
@@ -284,9 +281,8 @@ async function parseRequestObject(requestObject: IDataObject) {
 			await generateContentLengthHeader(axiosConfig.data, axiosConfig.headers);
 		} else if (requestObject.body !== undefined) {
 			// If we have body and possibly form
-			if (requestObject.form !== undefined) {
+			if (requestObject.form !== undefined && requestObject.body) {
 				// merge both objects when exist.
-				// @ts-ignore
 				requestObject.body = Object.assign(requestObject.body, requestObject.form);
 			}
 			axiosConfig.data = requestObject.body as FormData | GenericValue | GenericValue[];
@@ -313,10 +309,25 @@ async function parseRequestObject(requestObject: IDataObject) {
 		axiosConfig.params = requestObject.qs as IDataObject;
 	}
 
+	function hasArrayFormatOptions(
+		arg: IDataObject,
+	): arg is IDataObject & { qsStringifyOptions: { arrayFormat: 'repeat' | 'brackets' } } {
+		if (
+			typeof arg.qsStringifyOptions === 'object' &&
+			arg.qsStringifyOptions !== null &&
+			!Array.isArray(arg.qsStringifyOptions) &&
+			'arrayFormat' in arg.qsStringifyOptions
+		) {
+			return true;
+		}
+
+		return false;
+	}
+
 	if (
 		requestObject.useQuerystring === true ||
-		// @ts-ignore
-		requestObject.qsStringifyOptions?.arrayFormat === 'repeat'
+		(hasArrayFormatOptions(requestObject) &&
+			requestObject.qsStringifyOptions.arrayFormat === 'repeat')
 	) {
 		axiosConfig.paramsSerializer = (params) => {
 			return stringify(params, { arrayFormat: 'repeat' });
@@ -327,8 +338,10 @@ async function parseRequestObject(requestObject: IDataObject) {
 		};
 	}
 
-	// @ts-ignore
-	if (requestObject.qsStringifyOptions?.arrayFormat === 'brackets') {
+	if (
+		hasArrayFormatOptions(requestObject) &&
+		requestObject.qsStringifyOptions.arrayFormat === 'brackets'
+	) {
 		axiosConfig.paramsSerializer = (params) => {
 			return stringify(params, { arrayFormat: 'brackets' });
 		};
@@ -552,8 +565,11 @@ async function proxyRequestToAxios(
 ): Promise<any> {
 	// Check if there's a better way of getting this config here
 	if (process.env.N8N_USE_DEPRECATED_REQUEST_LIB) {
-		// @ts-ignore
-		return requestPromiseWithDefaults.call(null, uriOrObject, options);
+		return requestPromiseWithDefaults.call(
+			null,
+			uriOrObject as unknown as RequiredUriUrl & RequestPromiseOptions,
+			options as unknown as RequestCallback,
+		);
 	}
 
 	let axiosConfig: AxiosRequestConfig = {
@@ -970,10 +986,8 @@ export async function requestOAuth2(
 	const newRequestOptions = token.sign(requestOptions as clientOAuth2.RequestObject);
 	const newRequestHeaders = (newRequestOptions.headers = newRequestOptions.headers ?? {});
 	// If keep bearer is false remove the it from the authorization header
-	if (oAuth2Options?.keepBearer === false) {
-		newRequestHeaders.Authorization =
-			// @ts-ignore
-			newRequestHeaders.Authorization.split(' ')[1];
+	if (oAuth2Options?.keepBearer === false && typeof newRequestHeaders.Authorization === 'string') {
+		newRequestHeaders.Authorization = newRequestHeaders.Authorization.split(' ')[1];
 	}
 
 	if (oAuth2Options?.keyToIncludeInAccessTokenHeader) {
@@ -1110,10 +1124,8 @@ export async function requestOAuth2(
 			const newRequestOptions = newToken.sign(requestOptions as clientOAuth2.RequestObject);
 			newRequestOptions.headers = newRequestOptions.headers ?? {};
 
-			// @ts-ignore
 			if (oAuth2Options?.keyToIncludeInAccessTokenHeader) {
 				Object.assign(newRequestOptions.headers, {
-					// @ts-ignore
 					[oAuth2Options.keyToIncludeInAccessTokenHeader]: token.accessToken,
 				});
 			}
@@ -1126,9 +1138,8 @@ export async function requestOAuth2(
 	});
 }
 
-/* Makes a request using OAuth1 data for authentication
- *
- * @param {(OptionsWithUrl | requestPromise.RequestPromiseOptions)} requestOptions
+/**
+ * Makes a request using OAuth1 data for authentication
  */
 export async function requestOAuth1(
 	this: IAllExecuteFunctions,
@@ -1169,20 +1180,21 @@ export async function requestOAuth1(
 		secret: oauthTokenData.oauth_token_secret as string,
 	};
 
-	// @ts-ignore
+	// @ts-expect-error @TECH_DEBT: Remove request library
 	requestOptions.data = { ...requestOptions.qs, ...requestOptions.form };
 
 	// Fixes issue that OAuth1 library only works with "url" property and not with "uri"
-	// @ts-ignore
+	// @ts-expect-error @TECH_DEBT: Remove request library
 	if (requestOptions.uri && !requestOptions.url) {
-		// @ts-ignore
+		// @ts-expect-error @TECH_DEBT: Remove request library
 		requestOptions.url = requestOptions.uri;
-		// @ts-ignore
+		// @ts-expect-error @TECH_DEBT: Remove request library
 		delete requestOptions.uri;
 	}
 
-	// @ts-ignore
-	requestOptions.headers = oauth.toHeader(oauth.authorize(requestOptions, token));
+	requestOptions.headers = oauth.toHeader(
+		oauth.authorize(requestOptions as unknown as clientOAuth1.RequestOptions, token),
+	);
 	if (isN8nRequest) {
 		return this.helpers.httpRequest(requestOptions as IHttpRequestOptions);
 	}
diff --git a/packages/core/src/WorkflowExecute.ts b/packages/core/src/WorkflowExecute.ts
index 632c336ae3..6f8318f7fd 100644
--- a/packages/core/src/WorkflowExecute.ts
+++ b/packages/core/src/WorkflowExecute.ts
@@ -156,7 +156,6 @@ export class WorkflowExecute {
 		startNodes: string[],
 		destinationNode: string,
 		pinData?: IPinData,
-		// @ts-ignore
 	): PCancelable<IRun> {
 		let incomingNodeConnections: INodeConnections | undefined;
 		let connection: IConnection;
@@ -783,7 +782,6 @@ export class WorkflowExecute {
 						gotCancel = true;
 					}
 
-					// @ts-ignore
 					if (gotCancel) {
 						return Promise.resolve();
 					}
@@ -911,7 +909,6 @@ export class WorkflowExecute {
 					}
 
 					for (let tryIndex = 0; tryIndex < maxTries; tryIndex++) {
-						// @ts-ignore
 						if (gotCancel) {
 							return Promise.resolve();
 						}
diff --git a/packages/core/test/NodeExecuteFunctions.test.ts b/packages/core/test/NodeExecuteFunctions.test.ts
index 653ff4456c..c3ec81a180 100644
--- a/packages/core/test/NodeExecuteFunctions.test.ts
+++ b/packages/core/test/NodeExecuteFunctions.test.ts
@@ -11,7 +11,6 @@ describe('NodeExecuteFunctions', () => {
 	describe(`test binary data helper methods`, () => {
 		// Reset BinaryDataManager for each run. This is a dirty operation, as individual managers are not cleaned.
 		beforeEach(() => {
-			//@ts-ignore
 			BinaryDataManager.instance = undefined;
 		});
 
diff --git a/packages/design-system/.eslintrc.js b/packages/design-system/.eslintrc.js
index 1924d2f23b..502408aeed 100644
--- a/packages/design-system/.eslintrc.js
+++ b/packages/design-system/.eslintrc.js
@@ -23,5 +23,6 @@ module.exports = {
 		'@typescript-eslint/prefer-nullish-coalescing': 'off',
 		'@typescript-eslint/prefer-optional-chain': 'off',
 		'@typescript-eslint/restrict-template-expressions': 'off',
+		'@typescript-eslint/ban-ts-comment': ['warn', { 'ts-ignore': true }],
 	}
 };
diff --git a/packages/editor-ui/.eslintrc.js b/packages/editor-ui/.eslintrc.js
index 568f6d0f83..e31d9ca0b8 100644
--- a/packages/editor-ui/.eslintrc.js
+++ b/packages/editor-ui/.eslintrc.js
@@ -49,5 +49,6 @@ module.exports = {
 		'@typescript-eslint/restrict-template-expressions': 'off',
 		'@typescript-eslint/return-await': 'off',
 		'@typescript-eslint/unbound-method': 'off',
+		'@typescript-eslint/ban-ts-comment': ['warn', { 'ts-ignore': true }],
 	},
 };
diff --git a/packages/node-dev/.eslintrc.js b/packages/node-dev/.eslintrc.js
index 0fa7780bcc..b2dfdae442 100644
--- a/packages/node-dev/.eslintrc.js
+++ b/packages/node-dev/.eslintrc.js
@@ -8,5 +8,6 @@ module.exports = {
 	],
 	rules: {
 		'import/order': 'off', // TODO: remove this
+		'@typescript-eslint/ban-ts-comment': ['warn', { 'ts-ignore': true }],
 	},
 };
diff --git a/packages/nodes-base/.eslintrc.js b/packages/nodes-base/.eslintrc.js
index cbdbb994ed..bf39010df0 100644
--- a/packages/nodes-base/.eslintrc.js
+++ b/packages/nodes-base/.eslintrc.js
@@ -59,6 +59,7 @@ module.exports = {
 		'@typescript-eslint/restrict-template-expressions': 'off',
 		'@typescript-eslint/return-await': 'off',
 		'@typescript-eslint/unbound-method': 'off',
+		'@typescript-eslint/ban-ts-comment': ['warn', { 'ts-ignore': true }],
 	},
 
 	overrides: [
diff --git a/packages/workflow/src/Expression.ts b/packages/workflow/src/Expression.ts
index 7d41149d15..81f5dac4bf 100644
--- a/packages/workflow/src/Expression.ts
+++ b/packages/workflow/src/Expression.ts
@@ -157,7 +157,6 @@ export class Expression {
 		data.Reflect = {};
 		data.Proxy = {};
 
-		// @ts-ignore
 		data.constructor = {};
 
 		// Deprecated
diff --git a/packages/workflow/src/Interfaces.ts b/packages/workflow/src/Interfaces.ts
index c51b200344..0ff80ad866 100644
--- a/packages/workflow/src/Interfaces.ts
+++ b/packages/workflow/src/Interfaces.ts
@@ -1400,6 +1400,7 @@ export interface IWorkflowDataProxyData {
 	$thisItemIndex: number;
 	$now: any;
 	$today: any;
+	constructor: any;
 }
 
 export type IWorkflowDataProxyAdditionalKeys = IDataObject;
diff --git a/packages/workflow/test/RoutingNode.test.ts b/packages/workflow/test/RoutingNode.test.ts
index e8fbaa80d9..2725527159 100644
--- a/packages/workflow/test/RoutingNode.test.ts
+++ b/packages/workflow/test/RoutingNode.test.ts
@@ -16,6 +16,7 @@ import {
 	IN8nRequestOperations,
 	INodeCredentialDescription,
 	IExecuteData,
+	INodeTypeDescription,
 } from '../src';
 
 import * as Helpers from './Helpers';
@@ -1689,8 +1690,7 @@ describe('RoutingNode', () => {
 					connections: {},
 				};
 
-				// @ts-ignore
-				nodeType.description = { ...testData.input.nodeType };
+				nodeType.description = { ...testData.input.nodeType } as INodeTypeDescription;
 
 				const workflow = new Workflow({
 					nodes: workflowData.nodes,
@@ -1714,8 +1714,7 @@ describe('RoutingNode', () => {
 					source: null,
 				} as IExecuteData;
 
-				// @ts-ignore
-				const nodeExecuteFunctions: INodeExecuteFunctions = {
+				const nodeExecuteFunctions: Partial<INodeExecuteFunctions> = {
 					getExecuteFunctions: () => {
 						return Helpers.getExecuteFunctions(
 							workflow,
@@ -1751,7 +1750,7 @@ describe('RoutingNode', () => {
 					runIndex,
 					nodeType,
 					executeData,
-					nodeExecuteFunctions,
+					nodeExecuteFunctions as INodeExecuteFunctions,
 				);
 
 				expect(result).toEqual(testData.output);
@@ -1763,12 +1762,7 @@ describe('RoutingNode', () => {
 		const tests: Array<{
 			description: string;
 			input: {
-				nodeType: {
-					properties?: INodeProperties[];
-					credentials?: INodeCredentialDescription[];
-					requestDefaults?: IHttpRequestOptions;
-					requestOperations?: IN8nRequestOperations;
-				};
+				nodeType: Partial<INodeTypeDescription>;
 				node: {
 					parameters: INodeParameters;
 				};
@@ -1868,8 +1862,7 @@ describe('RoutingNode', () => {
 					connections: {},
 				};
 
-				// @ts-ignore
-				nodeType.description = { ...testData.input.nodeType };
+				nodeType.description = { ...testData.input.nodeType } as INodeTypeDescription;
 
 				const workflow = new Workflow({
 					nodes: workflowData.nodes,
@@ -1895,8 +1888,7 @@ describe('RoutingNode', () => {
 
 				let currentItemIndex = 0;
 				for (let iteration = 0; iteration < inputData.main[0]!.length; iteration++) {
-					// @ts-ignore
-					const nodeExecuteFunctions: INodeExecuteFunctions = {
+					const nodeExecuteFunctions: Partial<INodeExecuteFunctions> = {
 						getExecuteFunctions: () => {
 							return Helpers.getExecuteFunctions(
 								workflow,
@@ -1927,6 +1919,10 @@ describe('RoutingNode', () => {
 						},
 					};
 
+					if (!nodeExecuteFunctions.getExecuteSingleFunctions) {
+						fail('Expected nodeExecuteFunctions to contain getExecuteSingleFunctions');
+					}
+
 					const routingNodeExecutionContext = nodeExecuteFunctions.getExecuteSingleFunctions(
 						routingNode.workflow,
 						routingNode.runExecutionData,
diff --git a/packages/workflow/test/Workflow.test.ts b/packages/workflow/test/Workflow.test.ts
index 5922b68a15..8b07046ebd 100644
--- a/packages/workflow/test/Workflow.test.ts
+++ b/packages/workflow/test/Workflow.test.ts
@@ -1,9 +1,12 @@
 import {
+	IBinaryKeyData,
 	IConnections,
+	IDataObject,
 	INode,
 	INodeExecutionData,
 	INodeParameters,
 	IRunExecutionData,
+	NodeParameterValueType,
 	Workflow,
 } from '../src';
 
@@ -696,7 +699,17 @@ describe('Workflow', () => {
 	});
 
 	describe('getParameterValue', () => {
-		const tests = [
+		const tests: {
+			description: string;
+			input: {
+				[nodeName: string]: {
+					parameters: Record<string, NodeParameterValueType>;
+					outputJson?: IDataObject;
+					outputBinary?: IBinaryKeyData;
+				};
+			};
+			output: Record<string, unknown>;
+		}[] = [
 			{
 				description: 'read simple not expression value',
 				input: {
@@ -881,6 +894,7 @@ describe('Workflow', () => {
 							binaryKey: {
 								data: '',
 								type: '',
+								mimeType: 'test',
 								fileName: 'test-file1.jpg',
 							},
 						},
@@ -908,6 +922,7 @@ describe('Workflow', () => {
 							binaryKey: {
 								data: '',
 								type: '',
+								mimeType: 'test',
 								fileName: 'test-file1.jpg',
 							},
 						},
@@ -1134,8 +1149,7 @@ describe('Workflow', () => {
 					{
 						name: 'Node3',
 						parameters: testData.input.hasOwnProperty('Node3')
-							? // @ts-ignore
-							  testData.input.Node3.parameters
+							? testData.input.Node3?.parameters
 							: {},
 						type: 'test.set',
 						typeVersion: 1,
@@ -1145,8 +1159,7 @@ describe('Workflow', () => {
 					{
 						name: 'Node 4 with spaces',
 						parameters: testData.input.hasOwnProperty('Node4')
-							? // @ts-ignore
-							  testData.input.Node4.parameters
+							? testData.input.Node4.parameters
 							: {},
 						type: 'test.set',
 						typeVersion: 1,
@@ -1187,6 +1200,11 @@ describe('Workflow', () => {
 						runData: {
 							Node1: [
 								{
+									source: [
+										{
+											previousNode: 'test',
+										},
+									],
 									startTime: 1,
 									executionTime: 1,
 									data: {
@@ -1194,7 +1212,6 @@ describe('Workflow', () => {
 											[
 												{
 													json: testData.input.Node1.outputJson || testData.input.Node1.parameters,
-													// @ts-ignore
 													binary: testData.input.Node1.outputBinary,
 												},
 											],
@@ -1226,7 +1243,6 @@ describe('Workflow', () => {
 						timezone,
 						{},
 					);
-					// @ts-ignore
 					expect(result).toEqual(testData.output[parameterName]);
 				}
 			});
@@ -1278,7 +1294,6 @@ describe('Workflow', () => {
 		//     const workflow = new Workflow({ nodes, connections, active: false, nodeTypes });
 		//     const activeNodeName = 'Node2';
 
-		//     // @ts-ignore
 		//     const parameterValue = nodes.find((node) => node.name === activeNodeName).parameters.name;
 		//     // const parameterValue = '=[data.propertyName]'; // TODO: Make this dynamic from node-data via "activeNodeName"!
 		//     const runData: RunData = {