first commit

app_vue/node_modules/@vue/vue-loader-v15/lib/descriptorCache.js

@@ -0,0 +1,47 @@
+const fs = require('fs')
+const path = require('path')
+const { resolveCompiler } = require('./compiler')
+
+const cache = new Map()
+
+exports.setDescriptor = function setDescriptor(filename, entry) {
+  cache.set(cleanQuery(filename), entry)
+}
+
+exports.getDescriptor = function getDescriptor(
+  filename,
+  options,
+  loaderContext
+) {
+  filename = cleanQuery(filename)
+  if (cache.has(filename)) {
+    return cache.get(filename)
+  }
+
+  // This function should only be called after the descriptor has been
+  // cached by the main loader.
+  // If this is somehow called without a cache hit, it's probably due to sub
+  // loaders being run in separate threads. The only way to deal with this is to
+  // read from disk directly...
+  const source = fs.readFileSync(filename, 'utf-8')
+  const sourceRoot = path.dirname(
+    path.relative(loaderContext.rootContext, loaderContext.resourcePath)
+  )
+  const { compiler, templateCompiler } = resolveCompiler(
+    loaderContext.rootContext
+  )
+  const descriptor = compiler.parse({
+    source,
+    compiler: options.compiler || templateCompiler,
+    filename,
+    sourceRoot,
+    needMap: loaderContext.sourceMap
+  })
+  cache.set(filename, descriptor)
+  return descriptor
+}
+
+function cleanQuery(str) {
+  const i = str.indexOf('?')
+  return i > 0 ? str.slice(0, i) : str
+}