Process experiment metadata in RC fetch response

[athiramanu]

This change introduces experiment details in the response of fetch call in Remote Config. The change is split into 3 PRs where:

1. Introduces the experiment details in the fetch response type
2. Extracts experiments received from the fetch response and saves in indexedDB
3. Sets the experiment and variant received as user property

This is 1/3 mentioned above

Design doc (internal): go/experiments-web

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[google-oss-bot]

Size Report ¹

Affected Products

• @firebase/remote-config

  Type	Base (1bcf83d)	Merge (9d75585)	Diff
  browser	39.0 kB	39.1 kB	+106 B (+0.3%)
  main	40.2 kB	40.4 kB	+106 B (+0.3%)
  module	39.0 kB	39.1 kB	+106 B (+0.3%)

• bundle

  Type	Base (1bcf83d)	Merge (9d75585)	Diff
  remote-config (getAndFetch)	59.4 kB	59.5 kB	+55 B (+0.1%)

• firebase

  Type	Base (1bcf83d)	Merge (9d75585)	Diff
  firebase-compat.js	809 kB	809 kB	+48 B (+0.0%)
  firebase-remote-config-compat.js	38.7 kB	38.7 kB	+48 B (+0.1%)
  firebase-remote-config.js	43.5 kB	43.6 kB	+48 B (+0.1%)

Test Logs

• Base (1bcf83d): https://github.com/firebase/firebase-js-sdk/actions/runs/17997712972
• Merge (9d75585): https://github.com/firebase/firebase-js-sdk/actions/runs/18024817976

1. https://storage.googleapis.com/firebase-sdk-metric-reports/pyk5jCF5mr.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

• @firebase/remote-config

  • activate

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	23.5 kB	23.6 kB	+55 B (+0.2%)
    size-with-ext-deps	50.0 kB	50.1 kB	+55 B (+0.1%)

  • ensureInitialized

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	23.1 kB	23.2 kB	+55 B (+0.2%)
    size-with-ext-deps	49.6 kB	49.7 kB	+55 B (+0.1%)

  • fetchAndActivate

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	24.2 kB	24.2 kB	+55 B (+0.2%)
    size-with-ext-deps	50.7 kB	50.7 kB	+55 B (+0.1%)

  • fetchConfig

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	23.7 kB	23.8 kB	+55 B (+0.2%)
    size-with-ext-deps	50.2 kB	50.3 kB	+55 B (+0.1%)

  • getAll

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	24.3 kB	24.4 kB	+55 B (+0.2%)
    size-with-ext-deps	50.8 kB	50.9 kB	+55 B (+0.1%)

  • getBoolean

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	24.2 kB	24.2 kB	+55 B (+0.2%)
    size-with-ext-deps	50.7 kB	50.7 kB	+55 B (+0.1%)

  • getNumber

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	24.2 kB	24.2 kB	+55 B (+0.2%)
    size-with-ext-deps	50.7 kB	50.7 kB	+55 B (+0.1%)

  • getRemoteConfig

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	23.9 kB	24.0 kB	+55 B (+0.2%)
    size-with-ext-deps	57.3 kB	57.4 kB	+55 B (+0.1%)

  • getString

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	24.2 kB	24.2 kB	+55 B (+0.2%)
    size-with-ext-deps	50.7 kB	50.7 kB	+55 B (+0.1%)

  • getValue

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	24.1 kB	24.2 kB	+55 B (+0.2%)
    size-with-ext-deps	50.6 kB	50.7 kB	+55 B (+0.1%)

  • isSupported

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	23.3 kB	23.3 kB	+55 B (+0.2%)
    size-with-ext-deps	49.7 kB	49.8 kB	+55 B (+0.1%)

  • onConfigUpdate

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	23.3 kB	23.3 kB	+55 B (+0.2%)
    size-with-ext-deps	49.7 kB	49.8 kB	+55 B (+0.1%)

  • setCustomSignals

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	23.6 kB	23.7 kB	+55 B (+0.2%)
    size-with-ext-deps	50.1 kB	50.2 kB	+55 B (+0.1%)

  • setLogLevel

    Size

    Type	Base (1bcf83d)	Merge (9d75585)	Diff
    size	23.3 kB	23.4 kB	+55 B (+0.2%)
    size-with-ext-deps	49.8 kB	49.9 kB	+55 B (+0.1%)

Test Logs

• Base (1bcf83d): https://github.com/firebase/firebase-js-sdk/actions/runs/17997712972
• Merge (9d75585): https://github.com/firebase/firebase-js-sdk/actions/runs/18024817976

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

[hsubox76]

Sorry, I didn't look far enough up and see that this is part of FetchResponse, which is already public. In that case I guess we need to export FirebaseExperimentDescription as well. You can keep the documentation on it minimal if you don't expect users to have to populate it. I was trying to see why FetchResponse needs to be public and the only place I see it exposed to users is that they can specify a "initialFetchResponse" in RemoteConfigOptions when they initialize remote config but I don't know where they get that object from. I assume from server-side RC somewhere, and they just pass it in. So in that case they probably don't inspect it and probably don't need much documentation about what's in it, but since they're handling it and passing it, I guess they need a somewhat accurate typing for it.

I'll leave it up to you and your tech writer how much or how little documentation you think it needs but if FetchResponse needs to stay public, then we need to at least export the types of everything in it.

[athiramanu]

Done