`mix igniter.install phoenix_sync --sync-mode embedded` fails on first run but succeeds on second run

[spapiernik]

Environment

• Elixir: 1.20.0-rc.4-otp-28, 1.19.5-otp-28, 1.18.4-otp-28
• Phoenix: 1.7.x
• Phoenix.Sync: 0.6.1
• igniter: 0.7.7

What I did

1. Created a new project:

mix phx.new hello

2. Added igniter to mix.exs:

{:igniter, "~> 0.6", only: [:dev, :test]}

3. Then ran:

mix igniter.install phoenix_sync --sync-mode embedded

First run result (FAILS)

Igniter adds phoenix_sync to mix.exs and compiles it, but then crashes with:

** (UndefinedFunctionError) function Phoenix.Sync.MixProject.project/0 is undefined (module Phoenix.Sync.MixProject is not available)
    Phoenix.Sync.MixProject.project()
    (phoenix_sync 0.6.1) lib/mix/tasks/phoenix_sync.install.ex:301: Mix.Tasks.PhoenixSync.Install.required_electric_version/0
    (phoenix_sync 0.6.1) lib/mix/tasks/phoenix_sync.install.ex:123: Mix.Tasks.PhoenixSync.Install.add_dependencies/2
    (igniter 0.7.7) lib/igniter/util/install.ex:187: anonymous fn/3 in Igniter.Util.Install.run_installers/5
    (elixir 1.20.0-rc.4) lib/enum.ex:2617: Enum."-reduce/3-lists^foldl/2-0-"/3
    (igniter 0.7.7) lib/igniter/util/install.ex:176: Igniter.Util.Install.run_installers/5
    (mix 1.20.0-rc.4) lib/mix/task.ex:502: anonymous fn/3 in Mix.Task.run_task/5
    (mix 1.20.0-rc.4) lib/mix/cli.ex:129: Mix.CLI.run_task/2

At this point:

• phoenix_sync has already been added to deps
• but the installer crashes before finishing

Second run (WORKS)

Without changing anything else, I run:

mix igniter.install phoenix_sync --sync-mode embedded

Now it succeeds:

• Detects phoenix_sync already installed
• Adds :electric
• Runs phoenix_sync.install
• Updates config and application files correctly

Observed behavior

• First run fails because Phoenix.Sync.MixProject is not available
  

  phoenix_sync/lib/mix/tasks/phoenix_sync.install.ex

  Line 301 in aaeaef7

  Phoenix.Sync.MixProject.project()

• Second run succeeds once the dependency is already compiled

What I expected

• mix igniter.install phoenix_sync --sync-mode embedded to succeed on the first run