Enable parsing of script setup tag in SFC

__tests__/core/__fixtures__/ComponentScriptSetup.vue

@@ -0,0 +1,10 @@
+<template>
+  <div>Hello world</div>
+</template>
+
+<script setup>
+/**
+ * @vue-event {String} foo - Emit foo event
+ */
+ const emit = defineEmits(['foo'])
+</script>

__tests__/core/__snapshots__/vueScriptSetupExtractor.js.snap

@@ -0,0 +1,10 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`core.extractVueScript extract script 1`] = `
+"
+/**
+ * @vue-event {String} foo - Emit foo event
+ */
+ const emit = defineEmits(['foo'])
+"
+`;

__tests__/core/vueScriptSetupExtractor.js

@@ -0,0 +1,10 @@
+const path = require('path');
+const extractVueScript = require('../../lib/core/vueScriptExtractor');
+
+describe('core.extractVueScript', () => {
+  const filename = path.join(__dirname, '__fixtures__', 'ComponentScriptSetup.vue');
+
+  test('extract script', () => {
+    expect(extractVueScript(filename)).toMatchSnapshot();
+  });
+});

lib/core/seekExportDefaultLine.js

@@ -18,6 +18,10 @@ module.exports = function seekExportDefaultLine(source, filename) {
     if (inScript && /export\s+default/.test(line)) {
       return i + 1; // index starts at 0, but file's lines start at 1
     }
+
+    if (inScript && /<script\ssetup>/.test(line)) {
+      return i;
+    }
   }
 
   return 0;

lib/core/vueScriptExtractor.js

@@ -4,7 +4,7 @@ const compiler = require('@vue/compiler-sfc');
 module.exports = function extractVueScript(filename) {
   const source = fs.readFileSync(filename, 'utf8');
   const parsedComponent = compiler.parse(source);
-  const scriptContent = parsedComponent.descriptor.script ? parsedComponent.descriptor.script.content : '';
-
+  let scriptContent = parsedComponent.descriptor.script ? parsedComponent.descriptor.script.content : null;
+  scriptContent ??= parsedComponent.descriptor.scriptSetup ? parsedComponent.descriptor.scriptSetup.content : '';
   return scriptContent;
 };