Move signBlob to a function, remove IAMSigner class

[kevmoo]

Fix up the docs

[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
googleapis_auth	Non-Breaking	2.0.0	2.1.0	2.0.1	✔️

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Unused Dependencies ✔️

Package	Status
googleapis_auth	✔️ All dependencies utilized correctly.

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License Headers ✔️

// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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API leaks ✔️

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[kevmoo]

Okay @demolaf – I cleaned up a bunch. Hopefully the firebase bits won't be broken.

[kevmoo]

@demolaf – here is the draft PR that builds on this invertase/dart_firebase_admin#170

[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:_discoveryapis_commons	1.0.8-wip	WIP (no publish necessary)
package:discoveryapis_generator	1.1.0-wip	WIP (no publish necessary)
package:googleapis	16.0.0	already published at pub.dev
package:googleapis_auth	2.1.0	ready to publish	googleapis_auth-v2.1.0
package:googleapis_beta	9.1.0-wip	WIP (no publish necessary)

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.