[turnipdabeets]

💡 Motivation and Context

Part of the 4.0 stack, on top of #873.

Removes PostHogDataMode.cellular. It was deprecated in 3.x by #891 (merged) because it has never done anything different from .any:

• dataMode is only read in PostHogQueue.updatePauseState. The queue pauses when there is no connection, or when dataMode == .wifi and the device isn't on Wi-Fi. Every other case sends, so .cellular falls through exactly like .any.
• That's been true since the v3 rewrite (iOS SDK v3 #75, Nov 2023). The 2.x Objective-C SDK had no data mode at all.
• No other PostHog SDK (Android, React Native, KMP) has a data-mode setting, and no sdk-specs spec covers it.
• The name suggests "send only on cellular", which it never did. Keeping it misleads people, and a major release is the only time it can go.

Nothing changes at runtime. Anyone using .cellular switches to .any and gets identical behavior.

Migration: replace .cellular with .any (PostHogDataModeCellular with PostHogDataModeAny in Objective-C).

Raw values

PostHogDataMode is an @objc Int enum. Without explicit raw values, removing the middle case would renumber .any from 2 to 1. This PR pins them: case wifi = 0, case any = 2. The generated header now has PostHogDataModeWifi = 0 and PostHogDataModeAny = 2, the same as 3.x.

Why keep .any at 2:

• Objective-C code compiled against a 3.x header has 2 baked in for PostHogDataModeAny. It keeps meaning "any".
• Any wrapper or app that stored or passed rawValue keeps working. A stale 1 (the old .cellular) still behaves like .any, because the queue only checks == .wifi. PostHogDataMode(rawValue: 1) returns nil.
• Renumbering gains nothing, and the gap at 1 is harmless.

Changes

• PostHogDataMode.cellular removed. .wifi and .any get explicit raw values 0 and 2.
• Public API snapshot updated.
• Changeset: posthog-ios major.

API snapshot diff:

-PostHog | PostHogConfig.PostHogDataMode.cellular | enum.case | case cellular | s:7PostHog0aB6ConfigC0aB8DataModeO8cellularyA2EmF
-PostHog | PostHogDataMode.cellular | enum.case | case cellular | c:@M@PostHog@E@PostHogDataMode@PostHogDataModeCellular

No tests or example apps referenced PostHogDataMode.cellular. Reachability.Connection.cellular and $network_cellular are separate and untouched.

Wrapper SDKs

Wrapper	Needs a change?
posthog-flutter	Compiles against 4.0: PostHog/posthog-flutter#634 (merged) maps "cellular" to .any and deprecates the Dart PostHogDataMode.cellular. PostHog/posthog-flutter#637 (v6, draft) removes the Dart value; it currently conflicts with main on that same switch and needs a rebase.
React Native plugin	No: PosthogReactNativePlugin.swift never sets dataMode.
posthog-kmp	No: it doesn't expose or set dataMode.

💚 How did you test it?

• make test: passed (XCTest: 169 tests, 0 failures; Swift Testing: 909 tests in 147 suites)
• make buildSdk: succeeded for iOS, macOS, tvOS, watchOS and visionOS
• make apiCheck: showed only the two removed cellular lines above. Snapshot updated with make apiUpdate.
• Built the PostHog scheme for iOS and checked the generated PostHog-Swift.h for PostHogDataModeWifi = 0 and PostHogDataModeAny = 2.
• No new test. The flush behavior of .wifi and .any is unchanged, and the existing dataMode default check in PostHogConfigTest still passes.

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Ran pnpm changeset to generate a changeset file

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Claude Code made the change, ran make format, make test, make buildSdk and make apiCheck/apiUpdate, and checked the generated Objective-C header. The main decision was pinning raw values so .any stays 2 (see above), rather than letting it renumber to 1.

🤖 Generated with Claude Code

[github-actions]

posthog-ios Compliance Report

Date: 2026-10-05 16:59:23 UTC
Duration: 222219ms

⚠️ Some Tests Failed

44/45 tests passed, 1 failed

---

Capture Tests

⚠️ 28/29 tests passed, 1 failed

View Details

Test	Status	Duration
Format Validation.Event Has Required Fields	✅	2991ms
Format Validation.Event Has Uuid	✅	3237ms
Format Validation.Event Has Lib Properties	✅	460ms
Format Validation.Distinct Id Is String	✅	3107ms
Format Validation.Token Is Present	✅	3020ms
Format Validation.Custom Properties Preserved	✅	2830ms
Format Validation.Event Has Timestamp	✅	2778ms
Retry Behavior.Retries On 503	✅	11734ms
Retry Behavior.Does Not Retry On 400	✅	4806ms
Retry Behavior.Does Not Retry On 401	✅	5095ms
Retry Behavior.Respects Retry After Header	✅	7832ms
Retry Behavior.Implements Backoff	✅	21725ms
Retry Behavior.Retries On 500	✅	9632ms
Retry Behavior.Retries On 502	✅	6136ms
Retry Behavior.Retries On 504	✅	9308ms
Retry Behavior.Max Retries Respected	❌	15592ms
Deduplication.Generates Unique Uuids	✅	3151ms
Deduplication.Preserves Uuid On Retry	✅	9278ms
Deduplication.Preserves Uuid And Timestamp On Retry	✅	16349ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	7911ms
Deduplication.No Duplicate Events In Batch	✅	2884ms
Deduplication.Different Events Have Different Uuids	✅	2788ms
Compression.Sends Gzip When Enabled	✅	2943ms
Batch Format.Uses Proper Batch Structure	✅	2844ms
Batch Format.Flush With No Events Sends Nothing	✅	208ms
Batch Format.Multiple Events Batched Together	✅	2966ms
Error Handling.Does Not Retry On 403	✅	4828ms
Error Handling.Does Not Retry On 413	✅	4771ms
Error Handling.Retries On 408	✅	5440ms

Failures

retry_behavior.max_retries_respected

Expected 4 requests, got 5

Feature_Flags Tests

✅ 16/16 tests passed

View Details

Test	Status	Duration
Request Payload.Request With Person Properties Device Id	✅	2992ms
Request Payload.Flags Request Uses V2 Query Param	✅	2777ms
Request Payload.Flags Request Hits Flags Path Not Decide	✅	2858ms
Request Payload.Flags Request Omits Authorization Header	✅	2937ms
Request Payload.Token In Flags Body Matches Init	✅	2865ms
Request Payload.Groups Round Trip	✅	2926ms
Request Payload.Groups Default To Empty Object	✅	2897ms
Request Payload.Person Properties Distinct Id Auto Populated When Caller Omits It	✅	2941ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	✅	2840ms
Request Payload.Disable Geoip Omitted Defaults To False	✅	2955ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	✅	3004ms
Request Lifecycle.No Flags Request On Init Alone	✅	215ms
Request Lifecycle.No Flags Request On Normal Capture	✅	471ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	✅	5808ms
Request Lifecycle.Mock Response Value Is Returned To Caller	✅	2893ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	✅	3178ms

[greptile-apps]

[High risk] Removes a public API enum case in a major version.

The PR appears safe to merge as part of the planned v4 API removal.

_{Reviews (1) · Last reviewed commit: "chore!: remove PostHogDataMode.cellular ..."}