Allow customizing wizer path using opts.wizerBin

Fixes bytecodealliance#222

Author: tomasol

README.md

@@ -119,10 +119,14 @@ AOT compilation can also be configured with the following options:
 
 [weval]: https://github.com/bytecodealliance/weval
 
-### Custom `weval` binary
+### Custom `weval` binary for AOT
 
 To use a custom (pre-downloaded) [`weval`][weval] binary, set the `wevalBin` option to the path to your desired weval binary.
 
+### Custom `wizer` binary when AOT is disabled
+
+To use a custom (pre-downloaded) [`wizer`](https://github.com/bytecodealliance/wizer) binary, set the `wizerBin` option to the path to your desired wizer binary.
+
 ### Async Support
 
 To support asynchronous operations, all functions may optionally be written as sync or async functions, even though they will always be turned into sync component functions.

src/componentize.js

@@ -292,8 +292,14 @@ export async function componentize(opts,
       }
     );
   } else {
+    let wizerBin;
+    if (opts.wizerBin) {
+      wizerBin = opts.wizerBin;
+    } else {
+      wizerBin = wizer;
+    }
     wizerProcess = spawnSync(
-      wizer,
+      wizerBin,
       [
         '--allow-wasi',
         '--init-func',

types.d.ts

@@ -27,6 +27,10 @@ interface ComponentizeOptions {
    * Use a pre-existing path to the `weval` binary, if present
    */
   wevalBin?: string,
+  /**
+   * Use a pre-existing path to the `wizer` binary, if present
+   */
+  wizerBin?: string,
   /**
    * Path to custom Preview2 Adapter
    */