Add SnoopPrecompile (#228)

The small dependency SnoopPrecompile helps precompilation, while itself having
little impact on latency.
With this change, JSON3 precompiles significantly better.

Co-authored-by: Jacob Quinn <[email protected]>

Author: jakobnissen

Project.toml

@@ -7,13 +7,15 @@ version = "1.10.0"
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 Mmap = "a63ad114-7e13-5084-954f-fe012c677804"
 Parsers = "69de0a69-1ddd-5017-9359-2bf0b02dc9f0"
+SnoopPrecompile = "66db9d55-30c0-4569-8b51-7e840670fc0c"
 StructTypes = "856f2bd8-1eba-4b0a-8007-ebc267875bd4"
 UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 
 [compat]
 Parsers = "0.3, 1, 2"
 StructTypes = "1.10"
 julia = "1.6"
+SnoopPrecompile = "1"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"

src/JSON3.jl

@@ -172,4 +172,6 @@ include("write.jl")
 include("pretty.jl")
 include("gentypes.jl")
 
+include("workload.jl")
+
 end # module

src/workload.jl

@@ -0,0 +1,19 @@
+using SnoopPrecompile
+
+@precompile_all_calls begin
+    str = """{"a": 1, "b": "hello, world", "c": [1, 2], "d": true, "e": null, "f": 1.92}"""
+
+    JSON3.read(IOBuffer(str))
+    json = JSON3.read(str)
+    for i in "abcdef"
+        json[i]
+    end
+
+    JSON3.read(
+        str,
+        NamedTuple{(:a, :b, :c, :d, :e, :f), Tuple{Int, String, Vector{Int}, Bool, Nothing, Float32}}
+    )
+
+    JSON3.write(IOBuffer(), json)
+    JSON3.pretty(IOBuffer(), json)
+end