Fixed

• Make fxtest.New ensure that the app was created successfully. Previously,
  it would return the app (similar to fx.New, which expects the user to verify
  the error).
• Update dig container to defer acyclic validation until after Invoke. Application
  startup time should improve proportional to the size of the dependency graph.
• Fix a goroutine leak in fxtest.Lifecycle.

Added

• Add fx.ErrorHook option to allow users to provide ErrorHandlers on invoke
  failures.
• VisualizeError returns the visualization wrapped in the error if available.

Added

• Add fx.Error option to short-circuit application startup.

Added

• Add fx.StartTimeout and fx.StopTimeout to make configuring application
  start and stop timeouts easier.
• Export the default start and stop timeout as fx.DefaultTimeout.

Fixed

• Make fxtest respect the application's start and stop timeouts.

Add fx.Populate to populate variables with values from the dependency injection container without requiring intermediate structs.

• Improve readability of hook logging in addition to provide and invoke.
• Fix bug which caused the OnStop for a lifecycle hook to be called even if it
  failed to start.

Add fx.NopLogger which disables lifecycle output.

Improve readability of start up logging.

First stable release: no breaking changes will be made in the 1.x series.

• [Breaking] Rename fx.Inject to fx.Extract.
• [Breaking] Rename fxtest.Must* to fxtest.Require*.
• [Breaking] Remove fx.Timeout and fx.DefaultTimeout.
• fx.Extract now supports fx.In tags on target structs.

• [Breaking] Lifecycle hooks now take a context.
• Add fx.In and fx.Out which exposes optional and named types.
  Modules should embed these types instead of relying on dig.In and dig.Out.
• Add an Err method to retrieve the underlying errors during the dependency
  graph construction. The same error is also returned from Start.
• Graph resolution now happens as part of fx.New, rather than at the beginning
  of app.Start. This allows inspection of the graph errors through app.Err()
  before the decision to start the app.
• Add a Logger option, which allows users to send Fx's logs to different
  sink.
• Add fxtest.App, which redirects log output to the user's testing.TB and
  provides some lifecycle helpers.