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node_modules/@vue/vue-loader-v15/lib/codegen/hotReload.js

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+const hotReloadAPIPath = JSON.stringify(require.resolve('vue-hot-reload-api'))
+
+const genTemplateHotReloadCode = (id, request) => {
+  return `
+    module.hot.accept(${request}, function () {
+      api.rerender('${id}', {
+        render: render,
+        staticRenderFns: staticRenderFns
+      })
+    })
+  `.trim()
+}
+
+exports.genHotReloadCode = (id, functional, templateRequest) => {
+  return `
+/* hot reload */
+if (module.hot) {
+  var api = require(${hotReloadAPIPath})
+  api.install(require('vue'))
+  if (api.compatible) {
+    module.hot.accept()
+    if (!api.isRecorded('${id}')) {
+      api.createRecord('${id}', component.options)
+    } else {
+      api.${functional ? 'rerender' : 'reload'}('${id}', component.options)
+    }
+    ${templateRequest ? genTemplateHotReloadCode(id, templateRequest) : ''}
+  }
+}
+  `.trim()
+}