Get a list of standard libraries available in the current Julia installation.

get-stdlibs.jl

# SPDX-License-Identifier: MIT
"""
Get a list of standard libraries available in the current Julia installation.

Test with Julia v1.0, v1.6~v1.14-DEV

# Returns
- A sorted vector of strings, each representing a standard library name.
"""
function get_stdlibs()
    lib_names = String[]

    # Read stdlibs from disk
    if isdir(Sys.STDLIB)
        for entry in readdir(Sys.STDLIB)
            path = joinpath(Sys.STDLIB, entry)
            if isdir(path)
                push!(lib_names, entry)
            end
        end
    end

    if isdefined(Pkg.Types, :stdlibs)
        ret_type = typeof(Pkg.Types.stdlibs())

        if ret_type == Dict{Base.UUID, String}
            # v1.6, v1.7
            append!(lib_names, values(Pkg.Types.stdlibs()))
        else
            @warn "Unknown return type: `$ret_type` for Pkg.Types.stdlibs()"
            # v1.8+
            # :: Dict{UUID, Tuple{String, VersionNumber}}
            for v in values(Pkg.Types.stdlibs())
                push!(lib_names, v[1])
            end
        end
    end

    # Need for Julia v1.11+
    if isdefined(Pkg.Types, :UPGRADABLE_STDLIBS)
        push!(lib_names, Pkg.Types.UPGRADABLE_STDLIBS...)
    end

    sort!(lib_names)
    unique!(lib_names)

    return lib_names
end