Switch to Weakdeps

This is a new feature in Julia 1.9+ that should
remove the dependency on Requires.jl. It should
offer mild precompilation and load time improvement
(contingent upon other dependencies here adopting Weakdeps as well).

Project.toml

@@ -36,13 +36,20 @@ JSON = "0.21"
 JSON3 = "1.9"
 MD5 = "0.2"
 PlotlyBase = "0.8.5, 0.8.6"
+PlotlyJS = "0.18"
 Requires = "1.3"
 YAML = "0.4.7"
 julia = "1.6"
 
+[extensions]
+PlotlyJSExt = "PlotlyJS"
+
 [extras]
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
 test = ["Aqua", "Test"]
+
+[weakdeps]
+PlotlyJS = "f0f68f2c-4968-5e81-91da-67840de0976a"

src/plotly_js.jl → ext/PlotlyJSExt.jl

@@ -1,8 +1,12 @@
+module PlotlyJSExt
+
 import JSON
+import PlotlyJS
 
 function DashBase.to_dash(p::PlotlyJS.SyncPlot)
     data = JSON.lower(p.plot)
     pop!(data, :config, nothing)
     return data
 end
 
+end

src/Dash.jl

@@ -3,7 +3,10 @@ using DashBase
 import HTTP, JSON3, CodecZlib, MD5
 using Sockets
 using Pkg.Artifacts
+
+if !isdefined(Base, :get_extension)
 using Requires
+end
 
 const ROOT_PATH = realpath(joinpath(@__DIR__, ".."))
 #const RESOURCE_PATH = realpath(joinpath(ROOT_PATH, "resources"))
@@ -106,12 +109,13 @@ end
 @place_embedded_components
 const _metadata = load_all_metadata()
 function __init__()
-   setup_renderer_resources()
-   setup_dash_resources()
-   @require PlotlyJS="f0f68f2c-4968-5e81-91da-67840de0976a" include("plotly_js.jl")
+    setup_renderer_resources()
+    setup_dash_resources()
+    @static if !isdefined(Base, :get_extension)
+        @require PlotlyJS="f0f68f2c-4968-5e81-91da-67840de0976a" include("../ext/PlotlyJSExt.jl")
+    end
 end
 
-
 JSON3.StructTypes.StructType(::Type{DashBase.Component}) = JSON3.StructTypes.Struct()
 JSON3.StructTypes.excludes(::Type{DashBase.Component}) = (:name, :available_props, :wildcard_regex)