diff --git a/web/ui/module/codemirror-promql/src/client/prometheus.ts b/web/ui/module/codemirror-promql/src/client/prometheus.ts
index cd8626719..ad9be14a5 100644
--- a/web/ui/module/codemirror-promql/src/client/prometheus.ts
+++ b/web/ui/module/codemirror-promql/src/client/prometheus.ts
@@ -55,6 +55,7 @@ export interface CacheConfig {
 export interface PrometheusConfig {
   url: string;
   lookbackInterval?: number;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
   httpErrorHandler?: (error: any) => void;
   fetchFn?: FetchFn;
   // cache will allow user to change the configuration of the cached Prometheus client (which is used by default)
@@ -79,6 +80,7 @@ const serviceUnavailable = 503;
 export class HTTPPrometheusClient implements PrometheusClient {
   private readonly lookbackInterval = 60 * 60 * 1000 * 12; //12 hours
   private readonly url: string;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
   private readonly errorHandler?: (error: any) => void;
   private readonly httpMethod: 'POST' | 'GET' = 'POST';
   // For some reason, just assigning via "= fetch" here does not end up executing fetch correctly
diff --git a/web/ui/module/codemirror-promql/src/lint/index.ts b/web/ui/module/codemirror-promql/src/lint/index.ts
index b39ee4b43..29d93de8c 100644
--- a/web/ui/module/codemirror-promql/src/lint/index.ts
+++ b/web/ui/module/codemirror-promql/src/lint/index.ts
@@ -14,6 +14,7 @@
 import { EditorView } from '@codemirror/view';
 import { Diagnostic, linter } from '@codemirror/lint';
 import { HybridLint } from './hybrid';
+import { Extension } from '@codemirror/state';
 
 type lintFunc = (view: EditorView) => readonly Diagnostic[] | Promise<readonly Diagnostic[]>;
 
@@ -27,6 +28,6 @@ export function newLintStrategy(): LintStrategy {
   return new HybridLint();
 }
 
-export function promQLLinter(callbackFunc: (this: LintStrategy) => lintFunc, thisArg: LintStrategy) {
+export function promQLLinter(callbackFunc: (this: LintStrategy) => lintFunc, thisArg: LintStrategy): Extension {
   return linter(callbackFunc.call(thisArg));
 }
diff --git a/web/ui/module/codemirror-promql/src/parser/parser.ts b/web/ui/module/codemirror-promql/src/parser/parser.ts
index f9a83f349..d90dd27cd 100644
--- a/web/ui/module/codemirror-promql/src/parser/parser.ts
+++ b/web/ui/module/codemirror-promql/src/parser/parser.ts
@@ -73,7 +73,7 @@ export class Parser {
     });
   }
 
-  analyze() {
+  analyze(): void {
     // when you are at the root of the tree, the first node is not `Expr` but a node with no name.
     // So to be able to iterate other the node relative to the promql node, we have to get the first child at the beginning
     this.checkAST(this.tree.topNode.firstChild);
diff --git a/web/ui/module/codemirror-promql/src/parser/vector.ts b/web/ui/module/codemirror-promql/src/parser/vector.ts
index 723dfb5c1..c219c3d10 100644
--- a/web/ui/module/codemirror-promql/src/parser/vector.ts
+++ b/web/ui/module/codemirror-promql/src/parser/vector.ts
@@ -30,7 +30,7 @@ import {
 import { VectorMatchCardinality, VectorMatching } from '../types';
 import { containsAtLeastOneChild, retrieveAllRecursiveNodes } from './path-finder';
 
-export function buildVectorMatching(state: EditorState, binaryNode: SyntaxNode) {
+export function buildVectorMatching(state: EditorState, binaryNode: SyntaxNode): VectorMatching | null {
   if (!binaryNode || binaryNode.type.id !== BinaryExpr) {
     return null;
   }
diff --git a/web/ui/module/codemirror-promql/src/promql.ts b/web/ui/module/codemirror-promql/src/promql.ts
index 01323edf9..0144c09c9 100644
--- a/web/ui/module/codemirror-promql/src/promql.ts
+++ b/web/ui/module/codemirror-promql/src/promql.ts
@@ -24,7 +24,7 @@ export enum LanguageType {
   MetricName = 'MetricName',
 }
 
-export function promQLLanguage(top: LanguageType) {
+export function promQLLanguage(top: LanguageType): LezerLanguage {
   return LezerLanguage.define({
     parser: parser.configure({
       top: top,
diff --git a/web/ui/module/codemirror-promql/src/test/utils.test.ts b/web/ui/module/codemirror-promql/src/test/utils.test.ts
index defd23bfa..c1e538342 100644
--- a/web/ui/module/codemirror-promql/src/test/utils.test.ts
+++ b/web/ui/module/codemirror-promql/src/test/utils.test.ts
@@ -28,7 +28,7 @@ export function createEditorState(expr: string): EditorState {
   });
 }
 
-export function mockPrometheusServer() {
+export function mockPrometheusServer(): void {
   nock('http://localhost:8080')
     .get('/api/v1/label/__name__/values')
     .query(true)