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PackageDescription API Version 4

Table of Contents

Target Format Reference

All targets should be declared in the Package.swift manifest file. Unless the relative path of the target is declared, the Package Manager will look for a directory matching the name of the target in these places:

Regular targets: Sources, Source, src, srcs.
Test targets: Tests, Sources, Source, src, srcs.

Package Manifest File Format Reference


    name: String,
    pkgConfig: String? = nil,
    providers: [SystemPackageProvider]? = nil,
    products: [Product] = [],
    dependencies: [Dependency] = [],
    targets: [Target] = [],
    swiftLanguageVersions: [Int]? = nil

- name: The name of the package.
- pkgConfig: Name of the pkg-config (.pc) file to get the additional flags for system modules.
- providers: Defines hints to display for installing system modules.
- products: The products vended by the package.
- dependencies: The external package dependencies.
- targets: The list of targets in the package.
- swiftLanguageVersions: Specifies the set of supported Swift language versions.


import PackageDescription

let package = Package(
    name: "FooBar"

This is the minimal requirement for a manifest to be valid. However, at least one target is required to build the package.


This property should only be used for System Module Packages. It defines the name of the pkg-config (.pc) file that should be searched and read to get the additional flags like include search path, linker search path, system libraries to link etc.

import PackageDescription

let package = Package(
    name: "CGtk3",
    pkgConfig: "gtk+-3.0"

Here gtk+-3.0.pc will be searched in standard locations for the current system. Users can provide their own paths for location of pc files using the environment variable, PKG_CONFIG_PATH, which will be searched before the standard locations.

NOTE: This feature does not require pkg-config to be installed. However, if installed it will be used to find additional platform specific pc file locations which might be unknown to SwiftPM.


This property should only be used for system module packages. It can be used to provide hints for users to install a System Module using a system package manager like homebrew, apt-get etc.

NOTE: SwiftPM will never execute the command, and only provide suggestions.

import PackageDescription

let package = Package(
    name: "CGtk3",
    pkgConfig: "gtk+-3.0",
    providers: [

In this case if SwiftPM determines that GTK 3 package is not installed, it will output an appropriate hint depending on which platform the user is on i.e. macOS, Ubuntu, etc.


This is the list of all the products that are vended by the package. A target is available to other packages only if it is a part of some product.

Two types of products are supported:

  • library: A library product contains library targets. It should contain the targets which are supposed to be used by other packages, i.e. the public API of a library package. The library product can be declared static, dynamic or automatic. It is recommended to use automatic so the Package Manager can decide appropriate linkage.

  • executable: An executable product is used to vend an executable target. This should only be used if the executable needs to be made available to other packages.


let package = Package(
    name: "Paper",
    products: [
        .executable(name: "tool", targets: ["tool"]),
        .library(name: "Paper", targets: ["Paper"]),
        .library(name: "PaperStatic", type: .static, targets: ["Paper"]),
        .library(name: "PaperDynamic", type: .dynamic, targets: ["Paper"]),
    dependencies: [
        .package(url: "", from: "1.2.3"),
        .package(url: "../CHTTPParser", .upToNextMinor(from: "2.2.0")),
        .package(url: "http://some/other/lib", .exact("1.2.3")),
    targets: [
            name: "tool",
            dependencies: [
            name: "Paper",
            dependencies: [
                .target(name: "Utility"),
                .product(name: "CHTTPParser"),


This is the list of packages that the package depends on. You can specify a URL (or local path) to any valid Swift package.

import PackageDescription

let package = Package(
    name: "Example",
    dependencies: [
        .package(url: "", from: "1.0.0"),
    targets: [
        .target(name: "Foo", dependencies: ["SwiftyJSON"]),

A package dependency represents the location and the required version information of an external dependency. The version range controls what versions of a package dependency are expected to work with the current package. When the package manager is fetching the complete set of packages required to build a package, it considers all of the version range specifications from all of the packages in order to select appropriate versions.

The following options are available for declaring a package dependency:

// 1.0.0 ..< 2.0.0
.package(url: "/SwiftyJSON", from: "1.0.0"),

// 1.2.0 ..< 2.0.0
.package(url: "/SwiftyJSON", from: "1.2.0"),

// 1.5.8 ..< 2.0.0
.package(url: "/SwiftyJSON", from: "1.5.8"),

// 1.5.8 ..< 2.0.0
.package(url: "/SwiftyJSON", .upToNextMajor(from: "1.5.8")),

// 1.5.8 ..< 1.6.0
.package(url: "/SwiftyJSON", .upToNextMinor(from: "1.5.8")),

// 1.5.8
.package(url: "/SwiftyJSON", .exact("1.5.8")),

// Constraint to an arbitrary open range.
.package(url: "/SwiftyJSON", "1.2.3"..<"1.2.6"),

// Constraint to an arbitrary closed range.
.package(url: "/SwiftyJSON", "1.2.3"..."1.2.8"),

// Branch and revision.
.package(url: "/SwiftyJSON", .branch("develop")),
.package(url: "/SwiftyJSON", .revision("e74b07278b926c9ec6f9643455ea00d1ce04a021"))


The targets property is used to declare the targets in the package.

import PackageDescription

let package = Package(
    name: "FooBar",
    targets: [
        .target(name: "Foo", dependencies: []),
        .testTarget(name: "Bar", dependencies: ["Foo"]),

The above manifest declares two target, Foo and Bar. Bar is a test target which depends on Foo. The Package Manager will automatically search for the targets inside package in the predefined search paths.

A target dependency can either be another target in the same package or a product in one of its package dependencies. All target dependencies, internal or external, must be explicitly declared.

A target can be further customized with these properties:

  • path: This property defines the path to the top-level directory containing the target's sources, relative to the package root. It is not legal for this path to escape the package root, i.e., values like "../Foo", "/Foo" are invalid. The default value of this property will be nil, which means the target will be searched for in the pre-defined paths. The empty string ("") or dot (".") implies that the target's sources are directly inside the package root.

  • exclude: This property can be used to exclude certain files and directories from being picked up as sources. Exclude paths are relative to the target path. This property has more precedence than sources property.

  • sources: This property defines the source files to be included in the target. The default value of this property will be nil, which means all valid source files found in the target's path will be included. This can contain directories and individual source files. Directories will be searched recursively for valid source files. Paths specified are relative to the target path.

  • publicHeadersPath: This property defines the path to the directory containing public headers of a C target. This path is relative to the target path and default value of this property is include. Only valid for C family library targets.

Note: It is an error if the paths of two targets overlap (unless resolved with exclude).


This property is used to specify the set of supported Swift language versions.

The package manager will select the Swift language version that is most close to (but not exceeding) the major version of the Swift compiler in use. It is an error if a package does not support any version compatible with the current compiler. For e.g. if Swift language version is set to [3], both Swift 3 and 4 compilers will select '3', and if Swift language version is set to [3, 4], Swift 3 compiler will select '3' and Swift 4 compiler will select '4'.

If a package does not specify any Swift language versions, the language version to be used will match the major version of the package's Swift tools version. For e.g.: A Swift tools version with a major version of '3' will imply a default Swift language version of '3', and a Swift tools version with a major version of '4' will imply a default Swift language version of '4'.


A struct representing a semantic version.

	_ major: Int,
	_ minor: Int,
	_ patch: Int,
	prereleaseIdentifiers: [String] = [],
	buildMetadataIdentifiers: [String] = []

- major: The major version, incremented when you make incompatible API changes.
- minor: The minor version, incremented when you add functionality in a backwards-compatible manner.
- patch: The patch version, incremented when you make backwards-compatible bug fixes.
- prereleaseIdentifiers: Used to denote a pre-release version; for example, alpha, beta.
- buildMetadataIdentifiers: Optional build metadata; for example, timestamp, hash.

A Version struct can be initialized using a string literal in following format:


where prereleaseIdentifiers and buildMetadata are optional.
NOTE: prereleaseIdentifiers are separated by dot (.).