References

Design Document

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API documentation:

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Tooltip

Relevant PRs:

Deprecated in #59127

Removed in #90295

packageRoot in dart:core, dart:isolate, and package:platform

The following APIs have been removed:

Platform.packageRoot in dart:core

Isolate.packageRoot in dart:isolate

Platform.packageRoot in package:platform

These APIs were marked deprecated in Dart 2.0, and did not
work correctly in any Dart 2.x release.

Migration guide

These packageRoot APIs have been replaced by a new set of packageConfig APIs,
which you should migrate to.