fix

book/node_modules/string-template/index.js

@@ -0,0 +1,34 @@
+var nargs = /\{([0-9a-zA-Z]+)\}/g
+var slice = Array.prototype.slice
+
+module.exports = template
+
+function template(string) {
+    var args
+
+    if (arguments.length === 2 && typeof arguments[1] === "object") {
+        args = arguments[1]
+    } else {
+        args = slice.call(arguments, 1)
+    }
+
+    if (!args || !args.hasOwnProperty) {
+        args = {}
+    }
+
+    return string.replace(nargs, function replaceArg(match, i, index) {
+        var result
+
+        if (string[index - 1] === "{" &&
+            string[index + match.length] === "}") {
+            return i
+        } else {
+            result = args.hasOwnProperty(i) ? args[i] : null
+            if (result === null || result === undefined) {
+                return ""
+            }
+
+            return result
+        }
+    })
+}