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node_modules/@vue/vue-loader-v15/lib/select.js

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+const { resolveScript } = require('./resolveScript')
+
+module.exports = function selectBlock(
+  descriptor,
+  scopeId,
+  options,
+  loaderContext,
+  query,
+  appendExtension
+) {
+  // template
+  if (query.type === `template`) {
+    if (appendExtension) {
+      loaderContext.resourcePath += '.' + (descriptor.template.lang || 'html')
+    }
+    loaderContext.callback(
+      null,
+      descriptor.template.content,
+      descriptor.template.map
+    )
+    return
+  }
+
+  // script
+  if (query.type === `script`) {
+    const script = resolveScript(descriptor, scopeId, options, loaderContext)
+    if (appendExtension) {
+      loaderContext.resourcePath += '.' + (script.lang || 'js')
+    }
+    loaderContext.callback(null, script.content, script.map)
+    return
+  }
+
+  // styles
+  if (query.type === `style` && query.index != null) {
+    const style = descriptor.styles[query.index]
+    if (appendExtension) {
+      loaderContext.resourcePath += '.' + (style.lang || 'css')
+    }
+    loaderContext.callback(null, style.content, style.map)
+    return
+  }
+
+  // custom
+  if (query.type === 'custom' && query.index != null) {
+    const block = descriptor.customBlocks[query.index]
+    loaderContext.callback(null, block.content, block.map)
+    return
+  }
+}