text_blobs/Text module support for service worker format in local mode

This adds support for `text_blobs`/Text module support in local mode. Now that cloudflare/miniflare#228 has landed in miniflare (thanks @caass!), we can use that in wrangler as well.

Fixes #416

.changeset/short-cougars-approve.md

@@ -0,0 +1,7 @@
+---
+"wrangler": patch
+---
+
+`text_blobs`/Text module support for service worker format in local mode
+
+This adds support for `text_blobs`/Text module support in local mode. Now that https://github.com/cloudflare/miniflare/pull/228 has landed in miniflare (thanks @caass!), we can use that in wrangler as well.

packages/wrangler/src/__tests__/configuration.test.ts

@@ -354,7 +354,7 @@ describe("normalizeAndValidateConfig()", () => {
       expect(diagnostics.hasWarnings()).toBe(false);
     });
 
-    it("should error on invalid `wasm_module` paths", () => {
+    it("should error on invalid `wasm_modules` paths", () => {
       const expectedConfig = {
         wasm_modules: {
           MODULE_1: 111,

packages/wrangler/src/dev/local.tsx

@@ -82,6 +82,7 @@ function useLocalWorker({
       const scriptPath = realpathSync(bundle.path);
 
       const wasmBindings = { ...bindings.wasm_modules };
+      const textBlobBindings = { ...bindings.text_blobs };
       if (format === "service-worker") {
         for (const { type, name } of bundle.modules) {
           if (type === "compiled-wasm") {
@@ -91,6 +92,13 @@ function useLocalWorker({
             // characters with an underscore.
             const identifier = name.replace(/[^a-zA-Z0-9_$]/g, "_");
             wasmBindings[identifier] = name;
+          } else if (type === "text") {
+            // In service-worker format, text modules are referenced by global identifiers,
+            // so we convert it here.
+            // This identifier has to be a valid JS identifier, so we replace all non alphanumeric
+            // characters with an underscore.
+            const identifier = name.replace(/[^a-zA-Z0-9_$]/g, "_");
+            textBlobBindings[identifier] = name;
           }
         }
       }
@@ -130,6 +138,7 @@ function useLocalWorker({
           : undefined,
         bindings: bindings.vars,
         wasmBindings,
+        textBlobBindings,
         sourceMap: true,
         logUnhandledRejections: true,
       };
@@ -227,6 +236,7 @@ function useLocalWorker({
     publicDirectory,
     rules,
     bindings.wasm_modules,
+    bindings.text_blobs,
   ]);
   return { inspectorUrl };
 }

packages/wrangler/src/module-collection.ts

@@ -102,7 +102,7 @@ export default function createModuleCollector(props: {
           modules.splice(0);
         });
 
-        // ~ start  legacy module specifier support ~
+        // ~ start legacy module specifier support ~
 
         // This section detects usage of "legacy" 1.x style module specifiers
         // and modifies them so they "work" in wrangler v2, but with a warning