Live demo islands with highlighted source: SSR-safe effect, native component-source

- signals.sx: guard effect body with (when (client?) ...) so effects
  are no-op during SSR — only 2 stubs needed (effect, register-in-scope)
- sx_primitives.ml: add resource SSR stub (returns signal {loading: true}),
  remove 27 unnecessary browser primitive stubs
- sx_server.ml: native component-source that looks up Component/Island
  from env and pretty-prints the definition (replaces broken Python helper)
- reactive-islands/index.sx: Examples section with all 15 live demos
  inline + highlighted source via component-source
- reactive-islands/demo.sx: replace 14 hardcoded highlight strings with
  (component-source "~name") calls for always-current source

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

shared/static/wasm/sx/harness-reactive.sxbc

@@ -1,3 +1,3 @@
 (sxbc 1 "57726b5b82c1a3cb"
   (code
-    :constants ("assert-signal-value" {:upvalue-count 0 :arity 2 :constants ("deref" "assert=" "str" "Expected signal value " ", got ") :bytecode (20 0 0 16 0 48 1 17 2 20 1 0 16 2 16 1 1 3 0 16 1 1 4 0 16 2 52 2 0 4 49 3 50)} "assert-signal-has-subscribers" {:upvalue-count 0 :arity 1 :constants ("assert" ">" "len" "signal-subscribers" 0 "Expected signal to have subscribers") :bytecode (20 0 0 20 3 0 16 0 48 1 52 2 0 1 1 4 0 52 1 0 2 1 5 0 49 2 50)} "assert-signal-no-subscribers" {:upvalue-count 0 :arity 1 :constants ("assert" "=" "len" "signal-subscribers" 0 "Expected signal to have no subscribers") :bytecode (20 0 0 20 3 0 16 0 48 1 52 2 0 1 1 4 0 52 1 0 2 1 5 0 49 2 50)} "assert-signal-subscriber-count" {:upvalue-count 0 :arity 2 :constants ("len" "signal-subscribers" "assert=" "str" "Expected " " subscribers, got ") :bytecode (20 1 0 16 0 48 1 52 0 0 1 17 2 20 2 0 16 2 16 1 1 4 0 16 1 1 5 0 16 2 52 3 0 4 49 3 50)} "simulate-signal-set!" {:upvalue-count 0 :arity 2 :constants ("reset!") :bytecode (20 0 0 16 0 16 1 49 2 50)} "simulate-signal-swap!" {:upvalue-count 0 :arity 2 :constants ("swap!") :bytecode (20 0 0 16 0 16 1 49 2 50)} "assert-computed-dep-count" {:upvalue-count 0 :arity 2 :constants ("len" "signal-deps" "assert=" "str" "Expected " " deps, got ") :bytecode (20 1 0 16 0 48 1 52 0 0 1 17 2 20 2 0 16 2 16 1 1 4 0 16 1 1 5 0 16 2 52 3 0 4 49 3 50)} "assert-computed-depends-on" {:upvalue-count 0 :arity 2 :constants ("assert" "contains?" "signal-deps" "Expected computed to depend on the given signal") :bytecode (20 0 0 20 2 0 16 0 48 1 16 1 52 1 0 2 1 3 0 49 2 50)} "count-effect-runs" {:upvalue-count 0 :arity 1 :constants ("signal" 0 "effect" {:upvalue-count 1 :arity 0 :constants ("deref") :bytecode (20 0 0 18 0 49 1 50)} {:upvalue-count 2 :arity 0 :constants ("+" 1 "cek-call") :bytecode (18 0 1 1 0 52 0 0 2 19 0 5 20 2 0 18 1 2 49 2 50)}) :bytecode (20 0 0 1 1 0 48 1 17 1 20 2 0 51 3 0 1 1 48 1 5 1 1 0 17 2 20 2 0 51 4 0 1 2 1 0 48 1 17 3 16 2 50)} "make-test-signal" {:upvalue-count 0 :arity 1 :constants ("signal" "list" "effect" {:upvalue-count 2 :arity 0 :constants ("append!" "deref") :bytecode (20 0 0 18 0 20 1 0 18 1 48 1 49 2 50)} "history") :bytecode (20 0 0 16 0 48 1 17 1 52 1 0 0 17 2 20 2 0 51 3 0 1 2 1 1 48 1 5 1 0 0 16 1 1 4 0 16 2 65 2 0 50)} "assert-batch-coalesces" {:upvalue-count 0 :arity 2 :constants (0 "signal" "effect" {:upvalue-count 2 :arity 0 :constants ("deref" "+" 1) :bytecode (20 0 0 18 0 48 1 5 18 1 1 2 0 52 1 0 2 19 1 50)} "batch" "assert=" "str" "Expected " " notifications, got ") :bytecode (1 0 0 17 2 20 1 0 1 0 0 48 1 17 3 20 2 0 51 3 0 1 3 1 2 48 1 5 1 0 0 17 2 5 20 4 0 16 0 48 1 5 20 5 0 16 2 16 1 1 7 0 16 1 1 8 0 16 2 52 6 0 4 49 3 50)}) :bytecode (51 1 0 128 0 0 5 51 3 0 128 2 0 5 51 5 0 128 4 0 5 51 7 0 128 6 0 5 51 9 0 128 8 0 5 51 11 0 128 10 0 5 51 13 0 128 12 0 5 51 15 0 128 14 0 5 51 17 0 128 16 0 5 51 19 0 128 18 0 5 51 21 0 128 20 0 50)))
+    :constants ("assert-signal-value" {:upvalue-count 0 :arity 2 :constants ("deref" "assert=" "str" "Expected signal value " ", got ") :bytecode (20 0 0 16 0 48 1 17 2 20 1 0 16 2 16 1 1 3 0 16 1 1 4 0 16 2 52 2 0 4 49 3 50)} "assert-signal-has-subscribers" {:upvalue-count 0 :arity 1 :constants ("assert" ">" "len" "signal-subscribers" 0 "Expected signal to have subscribers") :bytecode (20 0 0 20 3 0 16 0 48 1 52 2 0 1 1 4 0 52 1 0 2 1 5 0 49 2 50)} "assert-signal-no-subscribers" {:upvalue-count 0 :arity 1 :constants ("assert" "=" "len" "signal-subscribers" 0 "Expected signal to have no subscribers") :bytecode (20 0 0 20 3 0 16 0 48 1 52 2 0 1 1 4 0 52 1 0 2 1 5 0 49 2 50)} "assert-signal-subscriber-count" {:upvalue-count 0 :arity 2 :constants ("len" "signal-subscribers" "assert=" "str" "Expected " " subscribers, got ") :bytecode (20 1 0 16 0 48 1 52 0 0 1 17 2 20 2 0 16 2 16 1 1 4 0 16 1 1 5 0 16 2 52 3 0 4 49 3 50)} "simulate-signal-set!" {:upvalue-count 0 :arity 2 :constants ("reset!") :bytecode (20 0 0 16 0 16 1 49 2 50)} "simulate-signal-swap!" {:upvalue-count 0 :arity 2 :constants ("swap!") :bytecode (20 0 0 16 0 16 1 49 2 50)} "assert-computed-dep-count" {:upvalue-count 0 :arity 2 :constants ("len" "signal-deps" "assert=" "str" "Expected " " deps, got ") :bytecode (20 1 0 16 0 48 1 52 0 0 1 17 2 20 2 0 16 2 16 1 1 4 0 16 1 1 5 0 16 2 52 3 0 4 49 3 50)} "assert-computed-depends-on" {:upvalue-count 0 :arity 2 :constants ("assert" "contains?" "signal-deps" "Expected computed to depend on the given signal") :bytecode (20 0 0 20 2 0 16 0 48 1 16 1 52 1 0 2 1 3 0 49 2 50)} "count-effect-runs" {:upvalue-count 0 :arity 1 :constants ("signal" 0 "effect" {:upvalue-count 1 :arity 0 :constants ("deref") :bytecode (20 0 0 18 0 49 1 50)} {:upvalue-count 2 :arity 0 :constants ("+" 1 "cek-call") :bytecode (18 0 1 1 0 52 0 0 2 19 0 5 20 2 0 18 1 2 49 2 50)}) :bytecode (20 0 0 1 1 0 48 1 17 1 51 3 0 1 1 52 2 0 1 5 1 1 0 17 2 51 4 0 1 2 1 0 52 2 0 1 17 3 16 2 50)} "make-test-signal" {:upvalue-count 0 :arity 1 :constants ("signal" "list" "effect" {:upvalue-count 2 :arity 0 :constants ("append!" "deref") :bytecode (20 0 0 18 0 20 1 0 18 1 48 1 49 2 50)} "history") :bytecode (20 0 0 16 0 48 1 17 1 52 1 0 0 17 2 51 3 0 1 2 1 1 52 2 0 1 5 1 0 0 16 1 1 4 0 16 2 65 2 0 50)} "assert-batch-coalesces" {:upvalue-count 0 :arity 2 :constants (0 "signal" "effect" {:upvalue-count 2 :arity 0 :constants ("deref" "+" 1) :bytecode (20 0 0 18 0 48 1 5 18 1 1 2 0 52 1 0 2 19 1 50)} "batch" "assert=" "str" "Expected " " notifications, got ") :bytecode (1 0 0 17 2 20 1 0 1 0 0 48 1 17 3 51 3 0 1 3 1 2 52 2 0 1 5 1 0 0 17 2 5 20 4 0 16 0 48 1 5 20 5 0 16 2 16 1 1 7 0 16 1 1 8 0 16 2 52 6 0 4 49 3 50)}) :bytecode (51 1 0 128 0 0 5 51 3 0 128 2 0 5 51 5 0 128 4 0 5 51 7 0 128 6 0 5 51 9 0 128 8 0 5 51 11 0 128 10 0 5 51 13 0 128 12 0 5 51 15 0 128 14 0 5 51 17 0 128 16 0 5 51 19 0 128 18 0 5 51 21 0 128 20 0 50)))

shared/static/wasm/sx/signals.sxbc

@@ -1,3 +1,3 @@
 (sxbc 1 "7e4a727b2f55684e"
   (code
-    :constants ("with-marsh-scope" {:upvalue-count 0 :arity 2 :constants ("list" "with-island-scope" {:upvalue-count 1 :arity 1 :constants ("append!") :bytecode (20 0 0 18 0 16 0 49 2 50)} "dom-set-data" "sx-marsh-disposers") :bytecode (52 0 0 0 17 2 20 1 0 51 2 0 1 2 16 1 48 2 5 20 3 0 16 0 1 4 0 16 2 49 3 50)} "dispose-marsh-scope" {:upvalue-count 0 :arity 1 :constants ("dom-get-data" "sx-marsh-disposers" "for-each" {:upvalue-count 0 :arity 1 :constants ("cek-call") :bytecode (20 0 0 16 0 2 49 2 50)} "dom-set-data") :bytecode (20 0 0 16 0 1 1 0 48 2 17 1 16 1 33 24 0 51 3 0 16 1 52 2 0 2 5 20 4 0 16 0 1 1 0 2 49 3 32 1 0 2 50)} "emit-event" {:upvalue-count 0 :arity 3 :constants ("dom-dispatch") :bytecode (20 0 0 16 0 16 1 16 2 49 3 50)} "on-event" {:upvalue-count 0 :arity 3 :constants ("dom-on") :bytecode (20 0 0 16 0 16 1 16 2 49 3 50)} "bridge-event" {:upvalue-count 0 :arity 4 :constants ("effect" {:upvalue-count 4 :arity 0 :constants ("dom-on" {:upvalue-count 2 :arity 1 :constants ("event-detail" "cek-call" "list" "reset!") :bytecode (20 0 0 16 0 48 1 17 1 18 0 33 16 0 20 1 0 18 0 16 1 52 2 0 1 48 2 32 2 0 16 1 17 2 20 3 0 18 1 16 2 49 2 50)}) :bytecode (20 0 0 18 0 18 1 51 1 0 0 2 0 3 48 3 17 0 16 0 50)}) :bytecode (20 0 0 51 1 0 1 0 1 1 1 3 1 2 49 1 50)} "resource" {:upvalue-count 0 :arity 1 :constants ("signal" "dict" "loading" "data" "error" "promise-then" "cek-call" {:upvalue-count 1 :arity 1 :constants ("reset!" "dict" "loading" "data" "error") :bytecode (20 0 0 18 0 1 2 0 4 1 3 0 16 0 1 4 0 2 52 1 0 6 49 2 50)} {:upvalue-count 1 :arity 1 :constants ("reset!" "dict" "loading" "data" "error") :bytecode (20 0 0 18 0 1 2 0 4 1 3 0 2 1 4 0 16 0 52 1 0 6 49 2 50)}) :bytecode (20 0 0 1 2 0 3 1 3 0 2 1 4 0 2 52 1 0 6 48 1 17 1 20 5 0 20 6 0 16 0 2 48 2 51 7 0 1 1 51 8 0 1 1 48 3 5 16 1 50)}) :bytecode (51 1 0 128 0 0 5 51 3 0 128 2 0 5 51 5 0 128 4 0 5 51 7 0 128 6 0 5 51 9 0 128 8 0 5 51 11 0 128 10 0 50)))
+    :constants ("with-marsh-scope" {:upvalue-count 0 :arity 2 :constants ("list" "with-island-scope" {:upvalue-count 1 :arity 1 :constants ("append!") :bytecode (20 0 0 18 0 16 0 49 2 50)} "dom-set-data" "sx-marsh-disposers") :bytecode (52 0 0 0 17 2 20 1 0 51 2 0 1 2 16 1 48 2 5 20 3 0 16 0 1 4 0 16 2 49 3 50)} "dispose-marsh-scope" {:upvalue-count 0 :arity 1 :constants ("dom-get-data" "sx-marsh-disposers" "for-each" {:upvalue-count 0 :arity 1 :constants ("cek-call") :bytecode (20 0 0 16 0 2 49 2 50)} "dom-set-data") :bytecode (20 0 0 16 0 1 1 0 48 2 17 1 16 1 33 24 0 51 3 0 16 1 52 2 0 2 5 20 4 0 16 0 1 1 0 2 49 3 32 1 0 2 50)} "emit-event" {:upvalue-count 0 :arity 3 :constants ("dom-dispatch") :bytecode (16 0 16 1 16 2 52 0 0 3 50)} "on-event" {:upvalue-count 0 :arity 3 :constants ("dom-on") :bytecode (20 0 0 16 0 16 1 16 2 49 3 50)} "bridge-event" {:upvalue-count 0 :arity 4 :constants ("effect" {:upvalue-count 4 :arity 0 :constants ("dom-on" {:upvalue-count 2 :arity 1 :constants ("event-detail" "cek-call" "list" "reset!") :bytecode (16 0 52 0 0 1 17 1 18 0 33 16 0 20 1 0 18 0 16 1 52 2 0 1 48 2 32 2 0 16 1 17 2 20 3 0 18 1 16 2 49 2 50)}) :bytecode (20 0 0 18 0 18 1 51 1 0 0 2 0 3 48 3 17 0 16 0 50)}) :bytecode (51 1 0 1 0 1 1 1 3 1 2 52 0 0 1 50)} "resource" {:upvalue-count 0 :arity 1 :constants ("signal" "dict" "loading" "data" "error" "promise-then" "cek-call" {:upvalue-count 1 :arity 1 :constants ("reset!" "dict" "loading" "data" "error") :bytecode (20 0 0 18 0 1 2 0 4 1 3 0 16 0 1 4 0 2 52 1 0 6 49 2 50)} {:upvalue-count 1 :arity 1 :constants ("reset!" "dict" "loading" "data" "error") :bytecode (20 0 0 18 0 1 2 0 4 1 3 0 2 1 4 0 16 0 52 1 0 6 49 2 50)}) :bytecode (20 0 0 1 2 0 3 1 3 0 2 1 4 0 2 52 1 0 6 48 1 17 1 20 6 0 16 0 2 48 2 51 7 0 1 1 51 8 0 1 1 52 5 0 3 5 16 1 50)}) :bytecode (51 1 0 128 0 0 5 51 3 0 128 2 0 5 51 5 0 128 4 0 5 51 7 0 128 6 0 5 51 9 0 128 8 0 5 51 11 0 128 10 0 50)))