wasi: add reactor support

PR-URL: https://github.com/nodejs/node/pull/34046
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/doc/api/wasi.md b/doc/api/wasi.md
index 46673af9e7f..9fe004ea599 100644
--- a/doc/api/wasi.md
+++ b/doc/api/wasi.md
@@ -132,6 +132,23 @@ Attempt to begin execution of `instance` as a WASI command by invoking its
 
 If `start()` is called more than once, an exception is thrown.
 
+### `wasi.initialize(instance)`
+<!-- YAML
+added:
+ - REPLACEME
+-->
+
+* `instance` {WebAssembly.Instance}
+
+Attempt to initialize `instance` as a WASI reactor by invoking its
+`_initialize()` export, if it is present. If `instance` contains a `_start()`
+export, then an exception is thrown.
+
+`initialize()` requires that `instance` exports a [`WebAssembly.Memory`][] named
+`memory`. If `instance` does not have a `memory` export an exception is thrown.
+
+If `initialize()` is called more than once, an exception is thrown.
+
 ### `wasi.wasiImport`
 <!-- YAML
 added: