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node_modules/vue-loader/lib/utils/gen-id.js

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+// utility for generating a uid for each component file
+// used in scoped CSS rewriting
+var path = require('path')
+var hash = require('hash-sum')
+var cache = Object.create(null)
+var sepRE = new RegExp(path.sep.replace('\\', '\\\\'), 'g')
+
+module.exports = function genId (file, context, key) {
+  var contextPath = context.split(path.sep)
+  var rootId = contextPath[contextPath.length - 1]
+  file = rootId + '/' + path.relative(context, file).replace(sepRE, '/') + (key || '')
+  return cache[file] || (cache[file] = hash(file))
+}

node_modules/vue-loader/lib/utils/normalize.js

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+var IS_TEST = !!process.env.VUE_LOADER_TEST
+var fs = require('fs')
+var path = require('path')
+
+exports.lib = function (file) {
+  return path.resolve(__dirname, '../', file)
+}
+
+exports.dep = function (dep) {
+  if (IS_TEST) {
+    return dep
+  } else if (fs.existsSync(path.resolve(__dirname, '../../node_modules', dep))) {
+    // npm 2 or npm linked
+    return 'vue-loader/node_modules/' + dep
+  } else {
+    // npm 3
+    return dep
+  }
+}