diff --git a/test_files/components/javascript_decoder/.gitignore b/test_files/components/javascript_decoder/.gitignore
new file mode 100644
index 0000000..3c3629e
--- /dev/null
+++ b/test_files/components/javascript_decoder/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/test_files/components/javascript_decoder/README.md b/test_files/components/javascript_decoder/README.md
new file mode 100644
index 0000000..743acd3
--- /dev/null
+++ b/test_files/components/javascript_decoder/README.md
@@ -0,0 +1,11 @@
+How to create and build the Javascript component:
+
+1. Create the `javascript_decoder` folder
+2. `cd javascript_decoder`
+3. Create `.gitignore` with content `node_modules`
+4. `npm install @bytecodealliance/jco @bytecodealliance/componentize-js binaryen`
+5. Create the `src` folder with the file `index.js`
+6. Create the `wit` folder with the file `world.wit`
+7. Update code as needed
+8. `npx jco componentize src/index.js --wit wit/world.wit --out javascript_decoder.wasm`
+9. `npx jco opt javascript_decoder.wasm --output javascript_decoder.wasm`
diff --git a/test_files/components/javascript_decoder/javascript_decoder.wasm b/test_files/components/javascript_decoder/javascript_decoder.wasm
new file mode 100644
index 0000000..88bde1d
Binary files /dev/null and b/test_files/components/javascript_decoder/javascript_decoder.wasm differ
diff --git a/test_files/components/javascript_decoder/package-lock.json b/test_files/components/javascript_decoder/package-lock.json
new file mode 100644
index 0000000..498a8bf
--- /dev/null
+++ b/test_files/components/javascript_decoder/package-lock.json
@@ -0,0 +1,570 @@
+{
+  "name": "javascript_decoder",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
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+        "binaryen": "^117.0.0"
+      }
+    },
+    "node_modules/@bytecodealliance/componentize-js": {
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+      "resolved": "https://registry.npmjs.org/@bytecodealliance/componentize-js/-/componentize-js-0.8.3.tgz",
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+      "dependencies": {
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+        "@bytecodealliance/wizer": "^3.0.1",
+        "es-module-lexer": "^1.4.1"
+      }
+    },
+    "node_modules/@bytecodealliance/componentize-js/node_modules/@bytecodealliance/jco": {
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+      "resolved": "https://registry.npmjs.org/@bytecodealliance/jco/-/jco-1.1.1.tgz",
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+      "dependencies": {
+        "@bytecodealliance/preview2-shim": "^0.16.1",
+        "binaryen": "^116.0.0",
+        "chalk-template": "^1",
+        "commander": "^12",
+        "mkdirp": "^3",
+        "ora": "^8",
+        "terser": "^5"
+      },
+      "bin": {
+        "jco": "src/jco.js"
+      }
+    },
+    "node_modules/@bytecodealliance/componentize-js/node_modules/binaryen": {
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+        "wasm2js": "bin/wasm2js"
+      }
+    },
+    "node_modules/@bytecodealliance/jco": {
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+        "binaryen": "^116.0.0",
+        "chalk-template": "^1",
+        "commander": "^12",
+        "mkdirp": "^3",
+        "ora": "^8",
+        "terser": "^5"
+      },
+      "bin": {
+        "jco": "src/jco.js"
+      }
+    },
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+      }
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+    "node_modules/@bytecodealliance/preview2-shim": {
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+        "wizer": "wizer.js"
+      },
+      "engines": {
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+      },
+      "optionalDependencies": {
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+      ],
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "bin": {
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+    },
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+}
diff --git a/test_files/components/javascript_decoder/package.json b/test_files/components/javascript_decoder/package.json
new file mode 100644
index 0000000..ca118b5
--- /dev/null
+++ b/test_files/components/javascript_decoder/package.json
@@ -0,0 +1,7 @@
+{
+  "dependencies": {
+    "@bytecodealliance/componentize-js": "^0.8.3",
+    "@bytecodealliance/jco": "^1.2.4",
+    "binaryen": "^117.0.0"
+  }
+}
diff --git a/test_files/components/javascript_decoder/src/index.js b/test_files/components/javascript_decoder/src/index.js
new file mode 100644
index 0000000..04d4139
--- /dev/null
+++ b/test_files/components/javascript_decoder/src/index.js
@@ -0,0 +1,17 @@
+import { log } from "component:javascript-decoder/host"
+
+const name = "Javascript Test Decoder"
+
+export const decoder = {
+    init() {
+        log(`${name} initialized`)
+    },
+    name() {
+        return name
+    },
+    formatSignalValue(value) {
+        value + "!"
+    }
+}
+
+
diff --git a/test_files/components/javascript_decoder/wit/world.wit b/test_files/components/javascript_decoder/wit/world.wit
new file mode 100644
index 0000000..777841a
--- /dev/null
+++ b/test_files/components/javascript_decoder/wit/world.wit
@@ -0,0 +1,16 @@
+package component:javascript-decoder;
+
+interface host {
+    log: func(message: string);
+}
+
+interface decoder {
+    init: func();
+    name: func() -> string;
+    format-signal-value: func(value: string) -> string;
+}
+
+world component {
+    import host;
+    export decoder;
+}