Manage HTTP connections based on tab visibility #9202

Samruddhi90 · 2025-08-12T06:56:41Z

This PR is a follow-up to #9199.

It introduces the logic for managing connections based on tab visibility. Specifically, it opens or closes a connection when a tab moves to the foreground or background. To achieve this, the existing VisibilityMonitor from the packages/database is being consolidated into a shared utility function in firebase/util. This change allows both the database and remote-config packages to use the same visibility monitoring API.

Future PRs will include the implementation of the AutoFetch logic and corresponding unit tests.

changeset-bot · 2025-08-12T06:56:45Z

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Latest commit: a98f140

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google-oss-bot · 2025-08-12T07:06:34Z

Size Report ¹

Affected Products

@firebase/remote-config
Type Base (61ba815) Merge (c954e36) Diff
browser 29.6 kB 32.3 kB +2.71 kB (+9.2%)
main 30.8 kB 33.6 kB +2.72 kB (+8.8%)
module 29.6 kB 32.3 kB +2.71 kB (+9.2%)
bundle
Type Base (61ba815) Merge (c954e36) Diff
remote-config (getAndFetch) 52.7 kB 54.9 kB +2.26 kB (+4.3%)
firebase
Type Base (61ba815) Merge (c954e36) Diff
firebase-compat.js 804 kB 806 kB +1.85 kB (+0.2%)
firebase-remote-config-compat.js 32.6 kB 34.6 kB +2.03 kB (+6.2%)
firebase-remote-config.js 37.1 kB 39.2 kB +2.13 kB (+5.8%)

Test Logs

https://storage.googleapis.com/firebase-sdk-metric-reports/8VP0LtjY8O.html

google-oss-bot · 2025-08-12T07:18:13Z

Size Analysis Report ¹

Affected Products

`@firebase/remote-config`

`activate`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	16.9 kB	19.0 kB	+2.03 kB (+12.0%)
size-with-ext-deps	43.2 kB	45.5 kB	+2.27 kB (+5.2%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache

11 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`ensureInitialized`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	16.6 kB	18.7 kB	+2.03 kB (+12.2%)
size-with-ext-deps	42.9 kB	45.2 kB	+2.27 kB (+5.3%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache

11 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`fetchAndActivate`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	17.7 kB	19.7 kB	+2.03 kB (+11.5%)
size-with-ext-deps	44.0 kB	46.2 kB	+2.27 kB (+5.2%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RemoteConfigAbortSignal
RestClient
RetryingClient
Storage
StorageCache

12 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RemoteConfigAbortSignal
RestClient
RetryingClient
Storage
StorageCache
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`fetchConfig`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	17.3 kB	19.4 kB	+2.03 kB (+11.7%)
size-with-ext-deps	43.6 kB	45.9 kB	+2.27 kB (+5.2%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RemoteConfigAbortSignal
RestClient
RetryingClient
Storage
StorageCache

12 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RemoteConfigAbortSignal
RestClient
RetryingClient
Storage
StorageCache
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`getAll`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	17.8 kB	19.8 kB	+2.03 kB (+11.4%)
size-with-ext-deps	44.1 kB	46.3 kB	+2.27 kB (+5.1%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
Value

12 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
Value
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`getBoolean`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	17.7 kB	19.7 kB	+2.03 kB (+11.5%)
size-with-ext-deps	43.9 kB	46.2 kB	+2.27 kB (+5.2%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
Value

12 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
Value
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`getNumber`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	17.7 kB	19.7 kB	+2.03 kB (+11.5%)
size-with-ext-deps	43.9 kB	46.2 kB	+2.27 kB (+5.2%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
Value

12 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
Value
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`getRemoteConfig`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	17.3 kB	19.4 kB	+2.03 kB (+11.7%)
size-with-ext-deps	50.5 kB	52.7 kB	+2.26 kB (+4.5%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache

11 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module Base (61ba815) Merge (c954e36) Diff

@firebase/util

ErrorFactory
FirebaseError
calculateBackoffMillis
deepEqual
getModularInstance
isIndexedDBAvailable

ErrorFactory
FirebaseError
assert
calculateBackoffMillis
deepEqual
getModularInstance
isIndexedDBAvailable

+ assert

`getString`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	17.7 kB	19.7 kB	+2.03 kB (+11.5%)
size-with-ext-deps	43.9 kB	46.2 kB	+2.27 kB (+5.2%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
Value

12 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
Value
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`getValue`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	17.6 kB	19.6 kB	+2.03 kB (+11.5%)
size-with-ext-deps	43.9 kB	46.1 kB	+2.27 kB (+5.2%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
Value

12 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
Value
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`isSupported`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	16.8 kB	18.8 kB	+2.03 kB (+12.1%)
size-with-ext-deps	43.0 kB	45.2 kB	+2.27 kB (+5.3%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache

11 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module Base (61ba815) Merge (c954e36) Diff

@firebase/util

ErrorFactory
FirebaseError
calculateBackoffMillis
getModularInstance
isIndexedDBAvailable
validateIndexedDBOpenable

ErrorFactory
FirebaseError
assert
calculateBackoffMillis
getModularInstance
isIndexedDBAvailable
validateIndexedDBOpenable

+ assert

`onConfigUpdate`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	16.8 kB	18.8 kB	+2.03 kB (+12.1%)
size-with-ext-deps	43.0 kB	45.3 kB	+2.27 kB (+5.3%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache

11 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`setCustomSignals`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	17.1 kB	19.2 kB	+2.03 kB (+11.8%)
size-with-ext-deps	43.4 kB	45.7 kB	+2.27 kB (+5.2%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache

11 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

`setLogLevel`

Size

Type	Base (`61ba815`)	Merge (`c954e36`)	Diff
size	16.8 kB	18.8 kB	+2.03 kB (+12.1%)
size-with-ext-deps	43.0 kB	45.3 kB	+2.27 kB (+5.3%)

Dependency

Type Base (61ba815) Merge (c954e36) Diff

classes

CachingClient
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache

11 dependencies

CachingClient
EventEmitter
InMemoryStorage
IndexedDbStorage
RealtimeHandler
RemoteConfig
RestClient
RetryingClient
Storage
StorageCache
VisibilityMonitor

+ EventEmitter
+ VisibilityMonitor

External Dependency

Module	Base (`61ba815`)	Merge (`c954e36`)	Diff
`@firebase/util`	ErrorFactory FirebaseError calculateBackoffMillis getModularInstance isIndexedDBAvailable	ErrorFactory FirebaseError assert calculateBackoffMillis getModularInstance isIndexedDBAvailable	+ assert

Test Logs

https://storage.googleapis.com/firebase-sdk-metric-reports/ZOJapGXKEf.html

packages/remote-config/src/client/realtime_handler.ts

Samruddhi90 added 4 commits August 9, 2025 19:41

Added the visibilityMonitor

c16eadd

minor changes

4002ed9

Merge branch 'realtime-backoff' into realtime-visibility-api

52686fc

resolving the spacing problem

6105412

Merge branch 'realtime-backoff' into realtime-visibility-api

a98f140

tusharkhandelwal8 requested review from ashish-kothari and dsjadaun-google August 12, 2025 13:19

ashish-kothari approved these changes Aug 13, 2025

View reviewed changes

packages/remote-config/src/client/realtime_handler.ts Show resolved Hide resolved

Samruddhi90 mentioned this pull request Aug 13, 2025

Implement Realtime Autofetch on Config Update Notifications #9206

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Manage HTTP connections based on tab visibility #9202

Manage HTTP connections based on tab visibility #9202

Samruddhi90 commented Aug 12, 2025

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`@firebase/remote-config`

`bundle`

`firebase`

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edited

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`@firebase/remote-config`

`activate`

`ensureInitialized`

`fetchAndActivate`

`fetchConfig`

`getAll`

`getBoolean`

`getNumber`

`getRemoteConfig`

`getString`

`getValue`

`isSupported`

`onConfigUpdate`

`setCustomSignals`

`setLogLevel`

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Manage HTTP connections based on tab visibility #9202

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Size Report 1

Affected Products

@firebase/remote-config

bundle

firebase

Test Logs

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Size Analysis Report 1

Affected Products

@firebase/remote-config

activate

ensureInitialized

fetchAndActivate

fetchConfig

getAll

getBoolean

getNumber

getRemoteConfig

getString

getValue

isSupported

onConfigUpdate

setCustomSignals

setLogLevel

Test Logs

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edited

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edited

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Size Report ¹

`@firebase/remote-config`

`bundle`

`firebase`

google-oss-bot commented Aug 12, 2025 •

edited

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Size Analysis Report ¹

`@firebase/remote-config`

`activate`

`ensureInitialized`

`fetchAndActivate`

`fetchConfig`

`getAll`

`getBoolean`

`getNumber`

`getRemoteConfig`

`getString`

`getValue`

`isSupported`

`onConfigUpdate`

`setCustomSignals`

`setLogLevel`