diff --git a/eslint.config.js b/eslint.config.js
index 41a0079299..5eb52ccf04 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -12,10 +12,6 @@ module.exports = {
   },
   rules: {
     "@typescript-eslint/no-this-alias": "off",
-    "eqeqeq": [
-      "error",
-      "smart"
-    ],
     "prefer-rest-params": "off",
     "@typescript-eslint/naming-convention": [
         "error",
diff --git a/packages/opentelemetry-context-async-hooks/src/AsyncLocalStorageContextManager.ts b/packages/opentelemetry-context-async-hooks/src/AsyncLocalStorageContextManager.ts
index 0af8695911..a1f4df09c1 100644
--- a/packages/opentelemetry-context-async-hooks/src/AsyncLocalStorageContextManager.ts
+++ b/packages/opentelemetry-context-async-hooks/src/AsyncLocalStorageContextManager.ts
@@ -36,7 +36,8 @@ export class AsyncLocalStorageContextManager extends AbstractAsyncHooksContextMa
     thisArg?: ThisParameterType<F>,
     ...args: A
   ): ReturnType<F> {
-    const cb = thisArg == null ? fn : fn.bind(thisArg);
+    const cb =
+      thisArg === null || thisArg === undefined ? fn : fn.bind(thisArg);
     return this._asyncLocalStorage.run(context, cb as never, ...args);
   }
 
diff --git a/packages/opentelemetry-core/src/common/attributes.ts b/packages/opentelemetry-core/src/common/attributes.ts
index df6b8f7a57..ae88743785 100644
--- a/packages/opentelemetry-core/src/common/attributes.ts
+++ b/packages/opentelemetry-core/src/common/attributes.ts
@@ -18,7 +18,7 @@ import { SpanAttributeValue, SpanAttributes } from '@opentelemetry/api';
 export function sanitizeAttributes(attributes: unknown): SpanAttributes {
   const out: SpanAttributes = {};
 
-  if (attributes == null || typeof attributes !== 'object') {
+  if (attributes === null || typeof attributes !== 'object') {
     return out;
   }
 
@@ -36,7 +36,7 @@ export function sanitizeAttributes(attributes: unknown): SpanAttributes {
 }
 
 export function isAttributeValue(val: unknown): val is SpanAttributeValue {
-  if (val == null) {
+  if (val === null || val === undefined) {
     return true;
   }
 
@@ -52,7 +52,7 @@ function isHomogeneousAttributeValueArray(arr: unknown[]): boolean {
 
   for (const element of arr) {
     // null/undefined elements are allowed
-    if (element == null) continue;
+    if (element === null || element === undefined) continue;
 
     if (!type) {
       if (isValidPrimitiveAttributeValue(element)) {
diff --git a/packages/opentelemetry-core/src/utils/environment.ts b/packages/opentelemetry-core/src/utils/environment.ts
index c353a38673..2fd5ccc237 100644
--- a/packages/opentelemetry-core/src/utils/environment.ts
+++ b/packages/opentelemetry-core/src/utils/environment.ts
@@ -173,7 +173,7 @@ function setLogLevelFromEnv(
   const value = values[key];
   if (typeof value === 'string') {
     const theLevel = logLevelMap[value.toUpperCase()];
-    if (theLevel != null) {
+    if (typeof theLevel === 'number') {
       environment[key] = theLevel;
     }
   }
diff --git a/packages/opentelemetry-instrumentation-fetch/src/fetch.ts b/packages/opentelemetry-instrumentation-fetch/src/fetch.ts
index 5aa369d82b..6b6bb2961d 100644
--- a/packages/opentelemetry-instrumentation-fetch/src/fetch.ts
+++ b/packages/opentelemetry-instrumentation-fetch/src/fetch.ts
@@ -112,7 +112,7 @@ export class FetchInstrumentation extends InstrumentationBase<
   ): void {
     const parsedUrl = web.parseUrl(response.url);
     span.setAttribute(HttpAttribute.HTTP_STATUS_CODE, response.status);
-    if (response.statusText != null) {
+    if (typeof response.statusText === 'string') {
       span.setAttribute(HttpAttribute.HTTP_STATUS_TEXT, response.statusText);
     }
     span.setAttribute(HttpAttribute.HTTP_HOST, parsedUrl.host);
diff --git a/packages/opentelemetry-instrumentation-http/test/integrations/http-enable.test.ts b/packages/opentelemetry-instrumentation-http/test/integrations/http-enable.test.ts
index 9995cd985c..7c0346fb8e 100644
--- a/packages/opentelemetry-instrumentation-http/test/integrations/http-enable.test.ts
+++ b/packages/opentelemetry-instrumentation-http/test/integrations/http-enable.test.ts
@@ -68,7 +68,7 @@ describe('HttpInstrumentation Integration tests', () => {
 
     mockServer.listen(0, () => {
       const addr = mockServer.address();
-      if (addr == null) {
+      if (addr === null || addr === undefined) {
         done(new Error('unexpected addr null'));
         return;
       }
diff --git a/packages/opentelemetry-instrumentation-http/test/integrations/https-enable.test.ts b/packages/opentelemetry-instrumentation-http/test/integrations/https-enable.test.ts
index 7df9f3e771..8894ecdcff 100644
--- a/packages/opentelemetry-instrumentation-http/test/integrations/https-enable.test.ts
+++ b/packages/opentelemetry-instrumentation-http/test/integrations/https-enable.test.ts
@@ -80,7 +80,7 @@ describe('HttpsInstrumentation Integration tests', () => {
 
     mockServer.listen(0, () => {
       const addr = mockServer.address();
-      if (addr == null) {
+      if (addr === null || addr === undefined) {
         done(new Error('unexpected addr null'));
         return;
       }
diff --git a/packages/opentelemetry-instrumentation-http/test/utils/httpRequest.ts b/packages/opentelemetry-instrumentation-http/test/utils/httpRequest.ts
index f507b7f1f1..0c2da0c113 100644
--- a/packages/opentelemetry-instrumentation-http/test/utils/httpRequest.ts
+++ b/packages/opentelemetry-instrumentation-http/test/utils/httpRequest.ts
@@ -53,7 +53,7 @@ function get(input: any, options?: any): GetResult {
       });
     }
     req =
-      options != null
+      options !== null && options !== undefined
         ? http.get(input, options, onGetResponseCb)
         : http.get(input, onGetResponseCb);
     req.on('error', err => {
diff --git a/packages/opentelemetry-instrumentation-http/test/utils/httpsRequest.ts b/packages/opentelemetry-instrumentation-http/test/utils/httpsRequest.ts
index f75cf1e566..3cd346953f 100644
--- a/packages/opentelemetry-instrumentation-http/test/utils/httpsRequest.ts
+++ b/packages/opentelemetry-instrumentation-http/test/utils/httpsRequest.ts
@@ -57,7 +57,7 @@ function get(input: any, options?: any): GetResult {
       });
     }
     req =
-      options != null
+      options !== null && options !== undefined
         ? https.get(input, options, onGetResponseCb)
         : https.get(input, onGetResponseCb);
     req.on('error', err => {
diff --git a/packages/opentelemetry-plugin-http/test/functionals/http-package.test.ts b/packages/opentelemetry-plugin-http/test/functionals/http-package.test.ts
index be05279d9a..748eb9ebf0 100644
--- a/packages/opentelemetry-plugin-http/test/functionals/http-package.test.ts
+++ b/packages/opentelemetry-plugin-http/test/functionals/http-package.test.ts
@@ -58,7 +58,7 @@ describe('Packages', () => {
 
     mockServer.listen(0, () => {
       const addr = mockServer.address();
-      if (addr == null) {
+      if (addr === null || addr === undefined) {
         done(new Error('unexpected addr null'));
         return;
       }
diff --git a/packages/opentelemetry-plugin-http/test/integrations/http-enable.test.ts b/packages/opentelemetry-plugin-http/test/integrations/http-enable.test.ts
index 65b0040eab..0dbf568f35 100644
--- a/packages/opentelemetry-plugin-http/test/integrations/http-enable.test.ts
+++ b/packages/opentelemetry-plugin-http/test/integrations/http-enable.test.ts
@@ -63,7 +63,7 @@ describe('HttpPlugin Integration tests', () => {
 
     mockServer.listen(0, () => {
       const addr = mockServer.address();
-      if (addr == null) {
+      if (addr === null || addr === undefined) {
         done(new Error('unexpected addr null'));
         return;
       }
diff --git a/packages/opentelemetry-plugin-http/test/utils/httpRequest.ts b/packages/opentelemetry-plugin-http/test/utils/httpRequest.ts
index f507b7f1f1..0c2da0c113 100644
--- a/packages/opentelemetry-plugin-http/test/utils/httpRequest.ts
+++ b/packages/opentelemetry-plugin-http/test/utils/httpRequest.ts
@@ -53,7 +53,7 @@ function get(input: any, options?: any): GetResult {
       });
     }
     req =
-      options != null
+      options !== null && options !== undefined
         ? http.get(input, options, onGetResponseCb)
         : http.get(input, onGetResponseCb);
     req.on('error', err => {
diff --git a/packages/opentelemetry-plugin-https/test/functionals/https-package.test.ts b/packages/opentelemetry-plugin-https/test/functionals/https-package.test.ts
index e742977e86..8d13bd9802 100644
--- a/packages/opentelemetry-plugin-https/test/functionals/https-package.test.ts
+++ b/packages/opentelemetry-plugin-https/test/functionals/https-package.test.ts
@@ -72,7 +72,7 @@ describe('Packages', () => {
 
     mockServer.listen(0, () => {
       const addr = mockServer.address();
-      if (addr == null) {
+      if (addr === null || addr === undefined) {
         done(new Error('unexpected addr null'));
         return;
       }
diff --git a/packages/opentelemetry-plugin-https/test/integrations/https-enable.test.ts b/packages/opentelemetry-plugin-https/test/integrations/https-enable.test.ts
index 74a247e909..804711ed4b 100644
--- a/packages/opentelemetry-plugin-https/test/integrations/https-enable.test.ts
+++ b/packages/opentelemetry-plugin-https/test/integrations/https-enable.test.ts
@@ -76,7 +76,7 @@ describe('HttpsPlugin Integration tests', () => {
 
     mockServer.listen(0, () => {
       const addr = mockServer.address();
-      if (addr == null) {
+      if (addr === null || addr === undefined) {
         done(new Error('unexpected addr null'));
         return;
       }
diff --git a/packages/opentelemetry-plugin-https/test/utils/httpsRequest.ts b/packages/opentelemetry-plugin-https/test/utils/httpsRequest.ts
index f75cf1e566..3cd346953f 100644
--- a/packages/opentelemetry-plugin-https/test/utils/httpsRequest.ts
+++ b/packages/opentelemetry-plugin-https/test/utils/httpsRequest.ts
@@ -57,7 +57,7 @@ function get(input: any, options?: any): GetResult {
       });
     }
     req =
-      options != null
+      options !== null && options !== undefined
         ? https.get(input, options, onGetResponseCb)
         : https.get(input, onGetResponseCb);
     req.on('error', err => {
diff --git a/packages/opentelemetry-tracing/src/Span.ts b/packages/opentelemetry-tracing/src/Span.ts
index ea6ebce182..f56bd01f16 100644
--- a/packages/opentelemetry-tracing/src/Span.ts
+++ b/packages/opentelemetry-tracing/src/Span.ts
@@ -89,7 +89,8 @@ export class Span implements api.Span, ReadableSpan {
 
   setAttribute(key: string, value?: SpanAttributeValue): this;
   setAttribute(key: string, value: unknown): this {
-    if (value == null || this._isSpanEnded()) return this;
+    if (value === null || value === undefined || this._isSpanEnded())
+      return this;
     if (key.length === 0) {
       api.diag.warn(`Invalid attribute key: ${key}`);
       return this;