| ## Flutter SDK dependency versions |
| |
| The files in this directory specifies pinned versions of various |
| dependencies of the flutter SDK. |
| |
| The `bin/internal/engine.version` file controls which version of the |
| Flutter engine to use. The file contains the commit hash of a commit |
| in the <https://github.com/flutter/engine> repository. That hash must |
| have successfully been compiled on |
| <https://build.chromium.org/p/client.flutter/> and had its artifacts |
| (the binaries that run on Android and iOS, the compiler, etc) |
| successfully uploaded to Google Cloud Storage. |
| |
| The `/bin/internal/engine.merge_method` file controls how we merge a |
| pull request created by the engine auto-roller. If it's `squash`, |
| there's only one commit for a pull request no matter how many engine |
| commits there are inside that pull request. If it's `rebase`, the |
| number of commits in the framework is equal to the number of engine |
| commits in the pull request. The latter method makes it easier to |
| detect regressions but costs more test resources. |
| |
| The `bin/internal/flutter_packages.version` file specifies the version |
| of the `flutter/packages` repository to be used for testing. The |
| `flutter/packages` repository isn't an upstream dependency of |
| `flutter/flutter`; it is only used as part of the test suite for |
| verification, and the pinned version here makes sure that tests are |
| deterministic at each `flutter/flutter` commit. |
