diff --git a/packages/browser/src/transports/fetch.ts b/packages/browser/src/transports/fetch.ts
index 241f2a1e8bc5..46c652bdea3e 100644
--- a/packages/browser/src/transports/fetch.ts
+++ b/packages/browser/src/transports/fetch.ts
@@ -1,5 +1,5 @@
 import { eventToSentryRequest, sessionToSentryRequest } from '@sentry/core';
-import { Event, Outcome, Response, SentryRequest, Session, TransportOptions } from '@sentry/types';
+import { Event, Response, SentryRequest, Session, TransportOptions } from '@sentry/types';
 import { SentryError, supportsReferrerPolicy, SyncPromise } from '@sentry/utils';
 
 import { BaseTransport } from './base';
@@ -37,7 +37,7 @@ export class FetchTransport extends BaseTransport {
    */
   private _sendRequest(sentryRequest: SentryRequest, originalPayload: Event | Session): PromiseLike<Response> {
     if (this._isRateLimited(sentryRequest.type)) {
-      this.recordLostEvent(Outcome.RateLimitBackoff, sentryRequest.type);
+      this.recordLostEvent('ratelimit_backoff', sentryRequest.type);
 
       return Promise.reject({
         event: originalPayload,
@@ -89,9 +89,9 @@ export class FetchTransport extends BaseTransport {
       .then(undefined, reason => {
         // It's either buffer rejection or any other xhr/fetch error, which are treated as NetworkError.
         if (reason instanceof SentryError) {
-          this.recordLostEvent(Outcome.QueueOverflow, sentryRequest.type);
+          this.recordLostEvent('queue_overflow', sentryRequest.type);
         } else {
-          this.recordLostEvent(Outcome.NetworkError, sentryRequest.type);
+          this.recordLostEvent('network_error', sentryRequest.type);
         }
         throw reason;
       });
diff --git a/packages/browser/src/transports/xhr.ts b/packages/browser/src/transports/xhr.ts
index 771cb16d2a51..1d5dd91f9c0b 100644
--- a/packages/browser/src/transports/xhr.ts
+++ b/packages/browser/src/transports/xhr.ts
@@ -1,5 +1,5 @@
 import { eventToSentryRequest, sessionToSentryRequest } from '@sentry/core';
-import { Event, Outcome, Response, SentryRequest, Session } from '@sentry/types';
+import { Event, Response, SentryRequest, Session } from '@sentry/types';
 import { SentryError, SyncPromise } from '@sentry/utils';
 
 import { BaseTransport } from './base';
@@ -26,7 +26,7 @@ export class XHRTransport extends BaseTransport {
    */
   private _sendRequest(sentryRequest: SentryRequest, originalPayload: Event | Session): PromiseLike<Response> {
     if (this._isRateLimited(sentryRequest.type)) {
-      this.recordLostEvent(Outcome.RateLimitBackoff, sentryRequest.type);
+      this.recordLostEvent('ratelimit_backoff', sentryRequest.type);
 
       return Promise.reject({
         event: originalPayload,
@@ -66,9 +66,9 @@ export class XHRTransport extends BaseTransport {
       .then(undefined, reason => {
         // It's either buffer rejection or any other xhr/fetch error, which are treated as NetworkError.
         if (reason instanceof SentryError) {
-          this.recordLostEvent(Outcome.QueueOverflow, sentryRequest.type);
+          this.recordLostEvent('queue_overflow', sentryRequest.type);
         } else {
-          this.recordLostEvent(Outcome.NetworkError, sentryRequest.type);
+          this.recordLostEvent('network_error', sentryRequest.type);
         }
         throw reason;
       });
diff --git a/packages/browser/test/unit/transports/base.test.ts b/packages/browser/test/unit/transports/base.test.ts
index 660163527048..9180fbabc8f3 100644
--- a/packages/browser/test/unit/transports/base.test.ts
+++ b/packages/browser/test/unit/transports/base.test.ts
@@ -1,5 +1,3 @@
-import { Outcome } from '@sentry/types';
-
 import { BaseTransport } from '../../../src/transports/base';
 
 const testDsn = 'https://123@sentry.io/42';
@@ -44,12 +42,12 @@ describe('BaseTransport', () => {
     it('sends beacon request when there are outcomes captured and visibility changed to `hidden`', () => {
       const transport = new SimpleTransport({ dsn: testDsn, sendClientReports: true });
 
-      transport.recordLostEvent(Outcome.BeforeSend, 'event');
+      transport.recordLostEvent('before_send', 'event');
 
       visibilityState = 'hidden';
       document.dispatchEvent(new Event('visibilitychange'));
 
-      const outcomes = [{ reason: Outcome.BeforeSend, category: 'error', quantity: 1 }];
+      const outcomes = [{ reason: 'before_send', category: 'error', quantity: 1 }];
 
       expect(sendBeaconSpy).toHaveBeenCalledWith(
         envelopeEndpoint,
@@ -59,7 +57,7 @@ describe('BaseTransport', () => {
 
     it('doesnt send beacon request when there are outcomes captured, but visibility state did not change to `hidden`', () => {
       const transport = new SimpleTransport({ dsn: testDsn, sendClientReports: true });
-      transport.recordLostEvent(Outcome.BeforeSend, 'event');
+      transport.recordLostEvent('before_send', 'event');
 
       visibilityState = 'visible';
       document.dispatchEvent(new Event('visibilitychange'));
@@ -70,21 +68,21 @@ describe('BaseTransport', () => {
     it('correctly serializes request with different categories/reasons pairs', () => {
       const transport = new SimpleTransport({ dsn: testDsn, sendClientReports: true });
 
-      transport.recordLostEvent(Outcome.BeforeSend, 'event');
-      transport.recordLostEvent(Outcome.BeforeSend, 'event');
-      transport.recordLostEvent(Outcome.SampleRate, 'transaction');
-      transport.recordLostEvent(Outcome.NetworkError, 'session');
-      transport.recordLostEvent(Outcome.NetworkError, 'session');
-      transport.recordLostEvent(Outcome.RateLimitBackoff, 'event');
+      transport.recordLostEvent('before_send', 'event');
+      transport.recordLostEvent('before_send', 'event');
+      transport.recordLostEvent('sample_rate', 'transaction');
+      transport.recordLostEvent('network_error', 'session');
+      transport.recordLostEvent('network_error', 'session');
+      transport.recordLostEvent('ratelimit_backoff', 'event');
 
       visibilityState = 'hidden';
       document.dispatchEvent(new Event('visibilitychange'));
 
       const outcomes = [
-        { reason: Outcome.BeforeSend, category: 'error', quantity: 2 },
-        { reason: Outcome.SampleRate, category: 'transaction', quantity: 1 },
-        { reason: Outcome.NetworkError, category: 'session', quantity: 2 },
-        { reason: Outcome.RateLimitBackoff, category: 'error', quantity: 1 },
+        { reason: 'before_send', category: 'error', quantity: 2 },
+        { reason: 'sample_rate', category: 'transaction', quantity: 1 },
+        { reason: 'network_error', category: 'session', quantity: 2 },
+        { reason: 'ratelimit_backoff', category: 'error', quantity: 1 },
       ];
 
       expect(sendBeaconSpy).toHaveBeenCalledWith(
@@ -97,12 +95,12 @@ describe('BaseTransport', () => {
       const tunnel = 'https://hello.com/world';
       const transport = new SimpleTransport({ dsn: testDsn, sendClientReports: true, tunnel });
 
-      transport.recordLostEvent(Outcome.BeforeSend, 'event');
+      transport.recordLostEvent('before_send', 'event');
 
       visibilityState = 'hidden';
       document.dispatchEvent(new Event('visibilitychange'));
 
-      const outcomes = [{ reason: Outcome.BeforeSend, category: 'error', quantity: 1 }];
+      const outcomes = [{ reason: 'before_send', category: 'error', quantity: 1 }];
 
       expect(sendBeaconSpy).toHaveBeenCalledWith(
         tunnel,
diff --git a/packages/browser/test/unit/transports/fetch.test.ts b/packages/browser/test/unit/transports/fetch.test.ts
index caa47cd76773..afb427b4026e 100644
--- a/packages/browser/test/unit/transports/fetch.test.ts
+++ b/packages/browser/test/unit/transports/fetch.test.ts
@@ -1,4 +1,3 @@
-import { Outcome } from '@sentry/types';
 import { SentryError } from '@sentry/utils';
 
 import { Event, Response, Transports } from '../../../src';
@@ -117,7 +116,7 @@ describe('FetchTransport', () => {
       try {
         await transport.sendEvent(eventPayload);
       } catch (_) {
-        expect(spy).toHaveBeenCalledWith(Outcome.NetworkError, 'event');
+        expect(spy).toHaveBeenCalledWith('network_error', 'event');
       }
     });
 
@@ -129,7 +128,7 @@ describe('FetchTransport', () => {
       try {
         await transport.sendEvent(transactionPayload);
       } catch (_) {
-        expect(spy).toHaveBeenCalledWith(Outcome.QueueOverflow, 'transaction');
+        expect(spy).toHaveBeenCalledWith('queue_overflow', 'transaction');
       }
     });
 
@@ -490,13 +489,13 @@ describe('FetchTransport', () => {
         try {
           await transport.sendEvent(eventPayload);
         } catch (_) {
-          expect(spy).toHaveBeenCalledWith(Outcome.RateLimitBackoff, 'event');
+          expect(spy).toHaveBeenCalledWith('ratelimit_backoff', 'event');
         }
 
         try {
           await transport.sendEvent(transactionPayload);
         } catch (_) {
-          expect(spy).toHaveBeenCalledWith(Outcome.RateLimitBackoff, 'transaction');
+          expect(spy).toHaveBeenCalledWith('ratelimit_backoff', 'transaction');
         }
       });
     });
diff --git a/packages/browser/test/unit/transports/xhr.test.ts b/packages/browser/test/unit/transports/xhr.test.ts
index 95b5c840c763..fcf7c26211da 100644
--- a/packages/browser/test/unit/transports/xhr.test.ts
+++ b/packages/browser/test/unit/transports/xhr.test.ts
@@ -1,4 +1,3 @@
-import { Outcome } from '@sentry/types';
 import { SentryError } from '@sentry/utils';
 import { fakeServer, SinonFakeServer } from 'sinon';
 
@@ -79,7 +78,7 @@ describe('XHRTransport', () => {
       try {
         await transport.sendEvent(eventPayload);
       } catch (_) {
-        expect(spy).toHaveBeenCalledWith(Outcome.NetworkError, 'event');
+        expect(spy).toHaveBeenCalledWith('network_error', 'event');
       }
     });
 
@@ -91,7 +90,7 @@ describe('XHRTransport', () => {
       try {
         await transport.sendEvent(transactionPayload);
       } catch (_) {
-        expect(spy).toHaveBeenCalledWith(Outcome.QueueOverflow, 'transaction');
+        expect(spy).toHaveBeenCalledWith('queue_overflow', 'transaction');
       }
     });
 
@@ -416,13 +415,13 @@ describe('XHRTransport', () => {
         try {
           await transport.sendEvent(eventPayload);
         } catch (_) {
-          expect(spy).toHaveBeenCalledWith(Outcome.RateLimitBackoff, 'event');
+          expect(spy).toHaveBeenCalledWith('ratelimit_backoff', 'event');
         }
 
         try {
           await transport.sendEvent(transactionPayload);
         } catch (_) {
-          expect(spy).toHaveBeenCalledWith(Outcome.RateLimitBackoff, 'transaction');
+          expect(spy).toHaveBeenCalledWith('ratelimit_backoff', 'transaction');
         }
       });
     });
diff --git a/packages/core/src/baseclient.ts b/packages/core/src/baseclient.ts
index 8e08eaaf43f8..af0d08187ee2 100644
--- a/packages/core/src/baseclient.ts
+++ b/packages/core/src/baseclient.ts
@@ -7,7 +7,6 @@ import {
   Integration,
   IntegrationClass,
   Options,
-  Outcome,
   SessionStatus,
   SeverityLevel,
   Transport,
@@ -541,7 +540,7 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
     // 0.0 === 0% events are sent
     // Sampling for transaction happens somewhere else
     if (!isTransaction && typeof sampleRate === 'number' && Math.random() > sampleRate) {
-      recordLostEvent(Outcome.SampleRate, 'event');
+      recordLostEvent('sample_rate', 'event');
       return SyncPromise.reject(
         new SentryError(
           `Discarding event because it's not included in the random sample (sampling rate = ${sampleRate})`,
@@ -552,7 +551,7 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
     return this._prepareEvent(event, scope, hint)
       .then(prepared => {
         if (prepared === null) {
-          recordLostEvent(Outcome.EventProcessor, event.type || 'event');
+          recordLostEvent('event_processor', event.type || 'event');
           throw new SentryError('An event processor returned null, will not send event.');
         }
 
@@ -566,7 +565,7 @@ export abstract class BaseClient<B extends Backend, O extends Options> implement
       })
       .then(processedEvent => {
         if (processedEvent === null) {
-          recordLostEvent(Outcome.BeforeSend, event.type || 'event');
+          recordLostEvent('before_send', event.type || 'event');
           throw new SentryError('`beforeSend` returned `null`, will not send event.');
         }
 
diff --git a/packages/core/test/lib/base.test.ts b/packages/core/test/lib/base.test.ts
index 2b91d3f8cd03..cd8d7f992fb4 100644
--- a/packages/core/test/lib/base.test.ts
+++ b/packages/core/test/lib/base.test.ts
@@ -1,5 +1,5 @@
 import { Hub, Scope, Session } from '@sentry/hub';
-import { Event, Outcome, Span, Transport } from '@sentry/types';
+import { Event, Span, Transport } from '@sentry/types';
 import { logger, SentryError, SyncPromise } from '@sentry/utils';
 
 import * as integrationModule from '../../src/integration';
@@ -882,7 +882,7 @@ describe('BaseClient', () => {
 
       client.captureEvent({ message: 'hello' }, {});
 
-      expect(recordLostEventSpy).toHaveBeenCalledWith(Outcome.BeforeSend, 'event');
+      expect(recordLostEventSpy).toHaveBeenCalledWith('before_send', 'event');
     });
 
     test('eventProcessor can drop the even when it returns null', () => {
@@ -914,7 +914,7 @@ describe('BaseClient', () => {
       scope.addEventProcessor(() => null);
       client.captureEvent({ message: 'hello' }, {}, scope);
 
-      expect(recordLostEventSpy).toHaveBeenCalledWith(Outcome.EventProcessor, 'event');
+      expect(recordLostEventSpy).toHaveBeenCalledWith('event_processor', 'event');
     });
 
     test('eventProcessor sends an event and logs when it crashes', () => {
@@ -958,7 +958,7 @@ describe('BaseClient', () => {
       );
 
       client.captureEvent({ message: 'hello' }, {});
-      expect(recordLostEventSpy).toHaveBeenCalledWith(Outcome.SampleRate, 'event');
+      expect(recordLostEventSpy).toHaveBeenCalledWith('sample_rate', 'event');
     });
   });
 
diff --git a/packages/tracing/src/transaction.ts b/packages/tracing/src/transaction.ts
index 45cb41357863..5143881ab159 100644
--- a/packages/tracing/src/transaction.ts
+++ b/packages/tracing/src/transaction.ts
@@ -2,7 +2,6 @@ import { getCurrentHub, Hub } from '@sentry/hub';
 import {
   Event,
   Measurements,
-  Outcome,
   Transaction as TransactionInterface,
   TransactionContext,
   TransactionMetadata,
@@ -107,7 +106,7 @@ export class Transaction extends SpanClass implements TransactionInterface {
       const client = this._hub.getClient();
       const transport = client && client.getTransport && client.getTransport();
       if (transport && transport.recordLostEvent) {
-        transport.recordLostEvent(Outcome.SampleRate, 'transaction');
+        transport.recordLostEvent('sample_rate', 'transaction');
       }
       return undefined;
     }
diff --git a/packages/tracing/test/idletransaction.test.ts b/packages/tracing/test/idletransaction.test.ts
index 07c545022ac1..b60fec726c54 100644
--- a/packages/tracing/test/idletransaction.test.ts
+++ b/packages/tracing/test/idletransaction.test.ts
@@ -1,6 +1,5 @@
 import { BrowserClient, Transports } from '@sentry/browser';
 import { Hub } from '@sentry/hub';
-import { Outcome } from '@sentry/types';
 
 import {
   DEFAULT_IDLE_TIMEOUT,
@@ -174,7 +173,7 @@ describe('IdleTransaction', () => {
     transaction.initSpanRecorder(10);
     transaction.finish(transaction.startTimestamp + 10);
 
-    expect(spy).toHaveBeenCalledWith(Outcome.SampleRate, 'transaction');
+    expect(spy).toHaveBeenCalledWith('sample_rate', 'transaction');
   });
 
   describe('_initTimeout', () => {
diff --git a/packages/types/src/transport.ts b/packages/types/src/transport.ts
index 40c26c146554..a1ba2983b1a3 100644
--- a/packages/types/src/transport.ts
+++ b/packages/types/src/transport.ts
@@ -5,14 +5,13 @@ import { Response } from './response';
 import { SdkMetadata } from './sdkmetadata';
 import { Session, SessionAggregates } from './session';
 
-export enum Outcome {
-  BeforeSend = 'before_send',
-  EventProcessor = 'event_processor',
-  NetworkError = 'network_error',
-  QueueOverflow = 'queue_overflow',
-  RateLimitBackoff = 'ratelimit_backoff',
-  SampleRate = 'sample_rate',
-}
+export type Outcome =
+  | 'before_send'
+  | 'event_processor'
+  | 'network_error'
+  | 'queue_overflow'
+  | 'ratelimit_backoff'
+  | 'sample_rate';
 
 /** Transport used sending data to Sentry */
 export interface Transport {
diff --git a/packages/types/src/transportoutcome.ts b/packages/types/src/transportoutcome.ts
new file mode 100644
index 000000000000..1fda3d9a447c
--- /dev/null
+++ b/packages/types/src/transportoutcome.ts
@@ -0,0 +1,11 @@
+/** JSDoc
+ * @deprecated Use string literals - if you require type casting, cast to Outcome type
+ */
+export enum Outcome {
+  BeforeSend = 'before_send',
+  EventProcessor = 'event_processor',
+  NetworkError = 'network_error',
+  QueueOverflow = 'queue_overflow',
+  RateLimitBackoff = 'ratelimit_backoff',
+  SampleRate = 'sample_rate',
+}