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【Laravel UIのインストール】Your requirements could not be resolved to an installable set of packages.と出たとき

Last updated at Posted at 2021-12-04

LaravelのアプリでReactを使いたくてLaravel UIをインストールする際にエラーとなってしまいました。
その際の覚書きです。

実行環境

  • macOS Catalina 10.15.7
  • Composer 2.1.12
  • Laravel 6.20.40

実行コマンドとエラー内容

実行コマンド

$ composer require laravel/ui

結果

Using version ^3.4 for laravel/ui
./composer.json has been updated
Running composer update laravel/ui
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - laravel/ui[v3.4.0, ..., 3.x-dev] require illuminate/console ^8.42|^9.0 -> found illuminate/console[dev-master, v8.42.0, ..., 8.x-dev, 9.x-dev (alias of dev-master)] but these were not loaded, likely because it conflicts with another require.
    - Root composer.json requires laravel/ui ^3.4 -> satisfiable by laravel/ui[v3.4.0, 3.x-dev].

You can also try re-running composer require with an explicit version constraint, e.g. "composer require laravel/ui:*" to figure out if any version is installable, or "composer require laravel/ui:^2.1" if you know which you need.

Installation failed, reverting ./composer.json and ./composer.lock to their original content.

結論

調べたところ,Laravel UIとLaravelは対応するバージョンが決まっているようです。

Laravel UI Laravel
1.x 5.8、6.x
2.x 7.x
3.x 8.x

自分の使ってるLaravel6.20.40に対応したバージョン1.0を指定してインストール

$ composer require laravel/ui:^1.0 --dev

無事インストールできました!

./composer.json has been updated
Running composer update laravel/ui
Loading composer repositories with package information
Updating dependencies
Lock file operations: 1 install, 0 updates, 0 removals
  - Locking laravel/ui (v1.3.0)
Writing lock file
Installing dependencies from lock file (including require-dev)
Package operations: 1 install, 0 updates, 0 removals
  - Downloading laravel/ui (v1.3.0)
  - Installing laravel/ui (v1.3.0): Extracting archive
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi
Discovered Package: facade/ignition
Discovered Package: fideloper/proxy
Discovered Package: laravel/tinker
Discovered Package: laravel/ui
Discovered Package: nesbot/carbon
Discovered Package: nunomaduro/collision
Package manifest generated successfully.
68 packages you are using are looking for funding.
Use the `composer fund` command to find out more!

余談

この後,Laravelのバージョンを7.30.5に変更したので,Laravel UIのバージョンも2.0に変更しました。

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