diff --git a/eslint.config.js b/eslint.config.js
index 663e6b32adf..41a00792995 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -12,7 +12,10 @@ module.exports = {
   },
   rules: {
     "@typescript-eslint/no-this-alias": "off",
-    "eqeqeq": "off",
+    "eqeqeq": [
+      "error",
+      "smart"
+    ],
     "prefer-rest-params": "off",
     "@typescript-eslint/naming-convention": [
         "error",
diff --git a/packages/opentelemetry-core/src/baggage/propagation/HttpBaggage.ts b/packages/opentelemetry-core/src/baggage/propagation/HttpBaggage.ts
index 6b40dcf66e8..8b2b309ac33 100644
--- a/packages/opentelemetry-core/src/baggage/propagation/HttpBaggage.ts
+++ b/packages/opentelemetry-core/src/baggage/propagation/HttpBaggage.ts
@@ -63,7 +63,9 @@ export class HttpBaggage implements TextMapPropagator {
 
   private _serializeKeyPairs(keyPairs: string[]) {
     return keyPairs.reduce((hValue: string, current: string) => {
-      const value = `${hValue}${hValue != '' ? ITEMS_SEPARATOR : ''}${current}`;
+      const value = `${hValue}${
+        hValue !== '' ? ITEMS_SEPARATOR : ''
+      }${current}`;
       return value.length > MAX_TOTAL_LENGTH ? hValue : value;
     }, '');
   }
@@ -81,7 +83,7 @@ export class HttpBaggage implements TextMapPropagator {
     const headerValue: string = getter.get(carrier, BAGGAGE_HEADER) as string;
     if (!headerValue) return context;
     const baggage: Record<string, BaggageEntry> = {};
-    if (headerValue.length == 0) {
+    if (headerValue.length === 0) {
       return context;
     }
     const pairs = headerValue.split(ITEMS_SEPARATOR);
@@ -107,7 +109,7 @@ export class HttpBaggage implements TextMapPropagator {
     const keyPairPart = valueProps.shift();
     if (!keyPairPart) return;
     const keyPair = keyPairPart.split(KEY_PAIR_SEPARATOR);
-    if (keyPair.length != 2) return;
+    if (keyPair.length !== 2) return;
     const key = decodeURIComponent(keyPair[0].trim());
     const value = decodeURIComponent(keyPair[1].trim());
     let metadata;
diff --git a/packages/opentelemetry-core/src/utils/environment.ts b/packages/opentelemetry-core/src/utils/environment.ts
index ad67f440a3b..c353a386731 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 != undefined) {
+    if (theLevel != null) {
       environment[key] = theLevel;
     }
   }
diff --git a/packages/opentelemetry-exporter-collector/test/common/transformMetrics.test.ts b/packages/opentelemetry-exporter-collector/test/common/transformMetrics.test.ts
index 30ede3ffd2f..14203f5d604 100644
--- a/packages/opentelemetry-exporter-collector/test/common/transformMetrics.test.ts
+++ b/packages/opentelemetry-exporter-collector/test/common/transformMetrics.test.ts
@@ -66,7 +66,7 @@ describe('transformMetrics', () => {
       let count3 = 0;
 
       function getValue(count: number) {
-        if (count % 2 == 0) {
+        if (count % 2 === 0) {
           return 3;
         }
         return -1;
diff --git a/packages/opentelemetry-instrumentation-fetch/src/fetch.ts b/packages/opentelemetry-instrumentation-fetch/src/fetch.ts
index 033b6b92eeb..5aa369d82b9 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 != undefined) {
+    if (response.statusText != null) {
       span.setAttribute(HttpAttribute.HTTP_STATUS_TEXT, response.statusText);
     }
     span.setAttribute(HttpAttribute.HTTP_HOST, parsedUrl.host);
diff --git a/packages/opentelemetry-metrics/test/Meter.test.ts b/packages/opentelemetry-metrics/test/Meter.test.ts
index 465f5b83013..b1ad16d701c 100644
--- a/packages/opentelemetry-metrics/test/Meter.test.ts
+++ b/packages/opentelemetry-metrics/test/Meter.test.ts
@@ -805,7 +805,7 @@ describe('Meter', () => {
 
       function getValue() {
         console.log('getting value, counter:', counter);
-        if (++counter % 2 == 0) {
+        if (++counter % 2 === 0) {
           return 3;
         }
         return -1;
diff --git a/packages/opentelemetry-propagator-b3/src/B3SinglePropagator.ts b/packages/opentelemetry-propagator-b3/src/B3SinglePropagator.ts
index 91f8d7d00db..8e751cfb799 100644
--- a/packages/opentelemetry-propagator-b3/src/B3SinglePropagator.ts
+++ b/packages/opentelemetry-propagator-b3/src/B3SinglePropagator.ts
@@ -37,7 +37,7 @@ const SAMPLED_VALUES = new Set(['d', '1']);
 const DEBUG_STATE = 'd';
 
 function convertToTraceId128(traceId: string): string {
-  return traceId.length == 32 ? traceId : `${PADDING}${traceId}`;
+  return traceId.length === 32 ? traceId : `${PADDING}${traceId}`;
 }
 
 function convertToTraceFlags(samplingState: string | undefined): TraceFlags {