feat(mod-api): expose developer mode

tests/engine/mod_developer_mode_test.lua

@@ -0,0 +1,86 @@
+-- Public load-time developer-mode signal for sandboxed mods.
+--
+-- The production break this catches is a loader that computes dev mode but
+-- does not expose the same fixed answer to the public mod object before the
+-- entry chunk runs.  It also protects the data-only contract: the public
+-- value is a boolean snapshot, not a live loader or environment handle.
+
+package.path = "./?.lua;./?/init.lua;" .. package.path
+
+local T = require("tests.modkit")
+
+local FILES = {
+  ["mods/dev_probe/manifest.json"] = [[{
+    "id": "dev_probe",
+    "name": "Developer Mode Probe",
+    "version": "1.0.0",
+    "entry": "main.lua",
+    "api": 2,
+    "games": ["all"]
+  }]],
+  ["mods/dev_probe/main.lua"] = [[
+    local mod = ...
+    mod.exports.seenAtLoad = mod.developer
+    mod.exports.kind = type(mod.developer)
+    if mod.developer then
+      mod.commands:register("dev_probe:diagnostics", function() return true end)
+    end
+  ]],
+}
+
+local function load(dev, generation)
+  return T.sdk.loadMods({ "mods/dev_probe" }, {
+    fs = T.sdk.memfs(FILES),
+    dev = dev,
+    generation = generation,
+  })
+end
+
+do
+  local run = load(true)
+  T.eq(#run.errors, 0, "developer-mode public probe loads clean")
+  local out = run.loader.exports.dev_probe
+  T.eq(out.seenAtLoad, true,
+    "sandboxed entry code sees developer mode at load time")
+  T.eq(out.kind, "boolean", "developer mode is exposed as plain data")
+  T.check(run.loader.content.commands:get("dev_probe:diagnostics") ~= nil,
+    "entry code can register diagnostics only in developer mode")
+  run.release()
+end
+
+do
+  local run = load(false)
+  T.eq(#run.errors, 0, "production-mode public probe loads clean")
+  local out = run.loader.exports.dev_probe
+  T.eq(out.seenAtLoad, false,
+    "sandboxed entry code sees production mode at load time")
+  T.eq(out.kind, "boolean", "production mode is exposed as plain data")
+  T.eq(run.loader.content.commands:get("dev_probe:diagnostics"), nil,
+    "production load does not register developer diagnostics")
+  run.release()
+end
+
+do
+  local run = load(true, 2)
+  T.eq(#run.errors, 0, "Gen 2 developer-mode public probe loads clean")
+  local out = run.loader.exports.dev_probe
+  T.eq(out.seenAtLoad, true,
+    "Gen 2 entry code sees the same developer-mode answer")
+  T.check(run.loader.content.commands:get("dev_probe:diagnostics") ~= nil,
+    "Gen 2 entry code can gate diagnostics on the same signal")
+  run.release()
+end
+
+do
+  local saved = _G.POKEPORT_DEV_MODE
+  _G.POKEPORT_DEV_MODE = true
+  local ok, run = pcall(load, nil)
+  _G.POKEPORT_DEV_MODE = saved
+  if not ok then error(run, 0) end
+  T.eq(#run.errors, 0, "command-line developer-mode probe loads clean")
+  T.eq(run.loader.exports.dev_probe.seenAtLoad, true,
+    "the --developer boot decision reaches the public signal")
+  run.release()
+end
+
+T.finish("mod developer mode public API")