Fix building on windows when using new syntax (#217)

The new sytax uses cwd() to strip the prefix when building using
original source location. We were not running it through
maybeWindowsPath which led to file not being found during
initialization. This PR fixes that and thus enables building on windows
using the new syntax.

Author: karthik2804

src/componentize.js

@@ -85,8 +85,8 @@ function isNumeric(n) {
 }
 
 export async function componentize(opts,
-                                   _deprecatedWitWorldOrOpts = undefined,
-                                   _deprecatedOpts = undefined) {
+  _deprecatedWitWorldOrOpts = undefined,
+  _deprecatedOpts = undefined) {
   let useOriginalSourceFile = true;
   let jsSource;
 
@@ -246,8 +246,9 @@ export async function componentize(opts,
       workspacePrefix = sourceDir;
       sourcePath = sourceName;
     }
-    if (workspacePrefix.startsWith(cwd())) {
-      workspacePrefix = cwd();
+    let currentDir = maybeWindowsPath(cwd());
+    if (workspacePrefix.startsWith(currentDir)) {
+      workspacePrefix = currentDir;
       sourcePath = sourcePath.slice(workspacePrefix.length + 1);
     }
   }

test/api/index.js

@@ -0,0 +1,11 @@
+import { now } from 'wasi:clocks/[email protected]';
+import { getRandomBytes } from 'wasi:random/[email protected]';
+
+let result;
+export const run = {
+    run() {
+        result = `NOW: ${now().seconds}, RANDOM: ${getRandomBytes(2n)}`;
+    }
+};
+
+export const getResult = () => result;

test/test.js

@@ -109,9 +109,9 @@ suite('Builtins', () => {
                 reject(
                   new Error(
                     'test timed out with output:\n' +
-                      stdout +
-                      '\n\nstderr:\n' +
-                      stderr
+                    stdout +
+                    '\n\nstderr:\n' +
+                    stderr
                   )
                 );
               }, 10_000);
@@ -254,7 +254,7 @@ suite('Bindings', () => {
 });
 
 suite('WASI', () => {
-  test('basic app', async () => {
+  test('basic app (old API)', async () => {
     const { component } = await componentize(
       `
       import { now } from 'wasi:clocks/[email protected]';
@@ -301,4 +301,40 @@ suite('WASI', () => {
     strictEqual(result.slice(0, 10), `NOW: ${String(Date.now()).slice(0, 5)}`);
     strictEqual(result.split(',').length, 3);
   });
+
+  test('basic app (OriginalSourceFile API)', async () => {
+    const { component } = await componentize(
+      {
+        sourcePath: "./test/api/index.js",
+        witPath: fileURLToPath(new URL('./wit', import.meta.url)),
+        worldName: 'test1',
+        enableAot,
+        debugBuild,
+      }
+    );
+
+    await writeFile(
+      new URL(`./output/wasi.component.wasm`, import.meta.url),
+      component
+    );
+
+    const { files } = await transpile(component, { tracing: DEBUG_TRACING });
+
+    await mkdir(new URL(`./output/wasi/interfaces`, import.meta.url), {
+      recursive: true,
+    });
+
+    for (const file of Object.keys(files)) {
+      await writeFile(
+        new URL(`./output/wasi/${file}`, import.meta.url),
+        files[file]
+      );
+    }
+
+    var instance = await import(`./output/wasi/component.js`);
+    instance.run.run();
+    const result = instance.getResult();
+    strictEqual(result.slice(0, 10), `NOW: ${String(Date.now()).slice(0, 5)}`);
+    strictEqual(result.split(',').length, 3);
+  });
 });