diff --git a/eslint.config.mjs b/eslint.config.mjs
index be9763c6576..44dee2771e0 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -420,7 +420,9 @@ export default [
       'no-await-in-loop': 'error',
       'no-else-return': ['error', { allowElseIf: true }],
       'no-implicit-coercion': ['error', { boolean: true, number: true, string: true, allow: ['!!'] }],
+      'no-unused-expressions': 'error',
       'no-useless-assignment': 'error',
+      'no-void': 'off',
       'operator-assignment': 'error',
       'prefer-exponentiation-operator': 'error',
       'prefer-object-has-own': 'error',
diff --git a/packages/datadog-instrumentations/src/couchbase.js b/packages/datadog-instrumentations/src/couchbase.js
index 7a648b7ef71..3dbf332ecd9 100644
--- a/packages/datadog-instrumentations/src/couchbase.js
+++ b/packages/datadog-instrumentations/src/couchbase.js
@@ -96,7 +96,7 @@ function wrap (prefix, fn) {
         return fn.apply(this, arguments)
       } catch (error) {
         ctx.error = error
-        error.stack // trigger getting the stack at the original throwing point
+        void error.stack // trigger getting the stack at the original throwing point
         errorCh.publish(ctx)
 
         throw error
@@ -162,7 +162,7 @@ function wrapCBandPromise (fn, name, startData, thisArg, args) {
       )
       return res
     } catch (e) {
-      e.stack
+      void e.stack
       ctx.error = e
       errorCh.publish(ctx)
       throw e
@@ -226,7 +226,7 @@ addHook({ name: 'couchbase', file: 'lib/bucket.js', versions: ['^2.6.12'] }, Buc
       try {
         return _n1qlReq.apply(this, arguments)
       } catch (err) {
-        err.stack // trigger getting the stack at the original throwing point
+        void err.stack // trigger getting the stack at the original throwing point
         ctx.error = err
         errorCh.publish(ctx)
 
diff --git a/packages/datadog-instrumentations/src/dns.js b/packages/datadog-instrumentations/src/dns.js
index ac37784c58d..3010911cc55 100644
--- a/packages/datadog-instrumentations/src/dns.js
+++ b/packages/datadog-instrumentations/src/dns.js
@@ -85,7 +85,7 @@ function wrap (prefix, fn, expectedArgs, rrtype) {
         return fn.apply(this, arguments)
       // TODO deal with promise versions when we support `dns/promises`
       } catch (error) {
-        error.stack // trigger getting the stack at the original throwing point
+        void error.stack // trigger getting the stack at the original throwing point
         ctx.error = error
         errorCh.publish(ctx)
 
diff --git a/packages/datadog-instrumentations/src/elasticsearch.js b/packages/datadog-instrumentations/src/elasticsearch.js
index 9cc7434e7d9..4a6ab62b84a 100644
--- a/packages/datadog-instrumentations/src/elasticsearch.js
+++ b/packages/datadog-instrumentations/src/elasticsearch.js
@@ -99,7 +99,7 @@ function createWrapRequest (name) {
           }
           return promise
         } catch (err) {
-          err.stack // trigger getting the stack at the original throwing point
+          void err.stack // trigger getting the stack at the original throwing point
           errorCh.publish(err)
 
           throw err
diff --git a/packages/datadog-instrumentations/src/graphql.js b/packages/datadog-instrumentations/src/graphql.js
index 2568661d4c7..84fffe66355 100644
--- a/packages/datadog-instrumentations/src/graphql.js
+++ b/packages/datadog-instrumentations/src/graphql.js
@@ -103,7 +103,7 @@ function wrapParse (parse) {
 
         return ctx.document
       } catch (err) {
-        err.stack
+        void err.stack
         ctx.error = err
         parseErrorCh.publish(ctx)
 
@@ -132,7 +132,7 @@ function wrapValidate (validate) {
         }
         return errors
       } catch (err) {
-        err.stack
+        void err.stack
         ctx.error = err
         validateErrorCh.publish(ctx)
 
diff --git a/packages/datadog-instrumentations/src/mariadb.js b/packages/datadog-instrumentations/src/mariadb.js
index bd3bb1334f2..a4deb69f7ce 100644
--- a/packages/datadog-instrumentations/src/mariadb.js
+++ b/packages/datadog-instrumentations/src/mariadb.js
@@ -66,7 +66,7 @@ function createWrapQuery (options) {
           finishCh.publish(ctx)
           return result
         }, error => {
-          ctx.error
+          ctx.error = error
           errorCh.publish(ctx)
           finishCh.publish(ctx)
           throw error
diff --git a/packages/datadog-instrumentations/src/mysql.js b/packages/datadog-instrumentations/src/mysql.js
index 5710b81d34a..b7bf01e8704 100644
--- a/packages/datadog-instrumentations/src/mysql.js
+++ b/packages/datadog-instrumentations/src/mysql.js
@@ -44,7 +44,7 @@ addHook({ name: 'mysql', file: 'lib/Connection.js', versions: ['>=2'] }, Connect
 
         return res
       } catch (err) {
-        err.stack // trigger getting the stack at the original throwing point
+        void err.stack // trigger getting the stack at the original throwing point
         ctx.error = err
         errorCh.publish(ctx)
 
diff --git a/packages/datadog-plugin-azure-functions/src/index.js b/packages/datadog-plugin-azure-functions/src/index.js
index 2203753dd84..d33f03fbd33 100644
--- a/packages/datadog-plugin-azure-functions/src/index.js
+++ b/packages/datadog-plugin-azure-functions/src/index.js
@@ -117,7 +117,7 @@ function extractTraceContext (tracer, ctx) {
     case 'Http':
       return tracer.extract('http_headers', Object.fromEntries(ctx.httpRequest.headers))
     default:
-      null
+      return null
   }
 }
 
diff --git a/packages/dd-trace/src/opentracing/propagation/text_map.js b/packages/dd-trace/src/opentracing/propagation/text_map.js
index 3d7668dfcd3..baffcab94c6 100644
--- a/packages/dd-trace/src/opentracing/propagation/text_map.js
+++ b/packages/dd-trace/src/opentracing/propagation/text_map.js
@@ -129,8 +129,8 @@ class TextMapPropagator {
   }
 
   _injectBaggageItems (spanContext, carrier) {
-    if (this._config.legacyBaggageEnabled) {
-      spanContext?._baggageItems && Object.keys(spanContext._baggageItems).forEach(key => {
+    if (this._config.legacyBaggageEnabled && spanContext?._baggageItems) {
+      Object.keys(spanContext._baggageItems).forEach(key => {
         carrier[baggagePrefix + key] = String(spanContext._baggageItems[key])
       })
     }
diff --git a/packages/dd-trace/src/remote_config/scheduler.js b/packages/dd-trace/src/remote_config/scheduler.js
index 65460a1e4e3..80fbab33333 100644
--- a/packages/dd-trace/src/remote_config/scheduler.js
+++ b/packages/dd-trace/src/remote_config/scheduler.js
@@ -17,7 +17,7 @@ class Scheduler {
   runAfterDelay (interval = this._interval) {
     this._timer = setTimeout(this._callback, interval, () => this.runAfterDelay())
 
-    this._timer.unref && this._timer.unref()
+    this._timer.unref()
   }
 
   stop () {