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Accept Interfaces, Return Concrete Types

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butuzov/ireturn

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Accept Interfaces, Return Concrete Types

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Install

You can getireturn withgo install command. Go1.23+ required.

go install github.com/butuzov/ireturn/cmd/ireturn@latest

Compiled Binary

Or you can download the suitable binary from thereleases section.

Usage

ireturn work with two arguments (but allow to use of only one of them in the same moment):

  • accept - accept-list of the comma-separated interfaces.
  • reject - reject-list of the comma-separated interfaces.

By default,ireturn will accept all errors (error), empty interfaces (interfaces{}), anonymous interfaces declarations (interface { methodName() } ) and interfaces from standard library as a valid ones.

Interfaces in the list can be provided as regexps or keywords ("error" for "error", "empty" forinterface{},anon for anonymous interfaces):

# allow usage of empty interfaces, errors and Doer interface from any package.ireturn --accept="\\.Doer,error,empty" ./...# reject standard library interfaces and plinko.Payload as valid onesireturn --reject="std,github.com/shipt/plinko.Payload" ./...# default settings allows errors, empty interfaces, anonymous declarations and standard libraryireturn ./...# checkfor non idiomatic interface namesireturn -allow="error,generic,anon,stdlib,.*(or|er)$" ./...

Keywords

You can use shorthand for some types of interfaces:

  • empty forinterface{} type
  • anon for anonymous declarationsinterface{ someMethod() }
  • error forerror type
  • stdlib for all interfaces from standard library.
  • generic for generic interfaces (added in go1.18)

Disable directive

golangci-lint compliant disable directive//nolint:ireturn can be used withireturn

GitHub Action

- uses: butuzov/ireturn-linter@main  with:    allow: "error,empty"

Examples

// Bad.typeDoerinterface {Do() }typeIDoerstruct{}funcNew()Doer {returnnew(IDoer)}func (d*IDoer)Do() {/*...*/}// Good.typeDoerinterface {Do() }typeIDoerstruct{}funcNew()*IDoer {returnnew(IDoer)}func (d*IDoer)Do() {/*...*/}// Very Good (Verify Interface Compliance in compile time)var_Doer= (*IDoer)(nil)typeDoerinterface {Do() }typeIDoerstruct{}funcNew()*IDoer {returnnew(IDoer)}func (d*IDoer)Do() {/*...*/}

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