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116 lines
3.1 KiB
Markdown
116 lines
3.1 KiB
Markdown
# Fallback for `psr/http-message-implementation` using `nyholm`
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Provides a metapackage for library needing `psr/http-message-implementation`
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that fallback to a default implementation when user does not meet
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the initial requirements.
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## Usage
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```shell
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composer require "Neur0toxine/psr.http-message-implementation.nyholm:*"
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```
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Composer will, by preference:
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- use an implementation provided by the user
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- otherwise, fallbacks to `nyholm/psr7`
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## How does it works
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This package contains 2 versions:
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1. The highest [1.1](https://github.com/Neur0toxine/psr.http-message-implementation.nyholm/blob/1.1/composer.json) needs nothing more than your requirements.
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1. The lowest [1.0](https://github.com/Neur0toxine/psr.http-message-implementation.nyholm/blob/1.0/composer.json) triggers install of `nyholm/psr7`.
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Composer will choose this highest version when user already has a package that satisfy `psr/http-message-implementation`.
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Otherwise, composer will choose the lowest version and in that case will
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download the following packages: `nyholm/psr7`.
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## What problem does it solve?
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You are maintaining a library that need an implementation of `psr/http-message-implementation`,
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but you don't want requiring a specific implementation.
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ie. You are maintainer of library that use the following composer.json
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```json
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{
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"name": "acme/lib",
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"require": {
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"psr/http-message-implementation": "^1.0",
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}
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}
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```
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When end users requires you library with the following code
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```json
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{
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"name": "end-user/app",
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"require": {
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"acme/lib": "^1.0"
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}
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}
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```
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They probably ends with such error
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```shell
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composer up
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Your requirements could not be resolved to an installable set of packages.
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Problem 1
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- Installation request for acme/lib ^1.0 -> satisfiable by acme/lib[1.0].
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- acme/lib 1.0 requires psr/http-message-implementation ^1.0 -> no matching package found.
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```
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You can ask user to install a random package, it works, but the DX is very bad,
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and confusing at first.
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By using `Neur0toxine/psr.http-message-implementation.nyholm`,
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users will be able to require their preferred implementation
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or fallback to your default choice
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### Example of user that meet the preferred requirements
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```json
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{
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"name": "end-user/app",
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"require": {
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"acme/lib": "^1.0",
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"third-party/provide-implementation": "^1.0"
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}
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}
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```
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```shell
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composer up
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...
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Package operations: 2 installs, 0 updates, 0 removals
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- Installing acme/lib (1.0)
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- Installing Neur0toxine/psr.http-message-implementation.nyholm (1.1)
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```
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### Example of user that fallback to your recommendations
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```json
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{
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"name": "end-user/app",
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"require": {
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"acme/lib": "^1.0"
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}
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}
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```
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```shell
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composer up
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...
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Package operations: 3 installs, 0 updates, 0 removals
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- Installing acme/lib (1.0)
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- Installing Neur0toxine/psr.http-message-implementation.nyholm (1.0)
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- Installing nyholm/psr7 (1.0)
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```
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## Contributing
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This repository is automatically generated. If you want contributing and
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submitting an issue or a Pull Request, please use
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[composer-fallback/generator](https://github.com/composer-fallback/generator).
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