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node_modules/vue-router/src/util/params.js

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+/* @flow */
+
+import { warn } from './warn'
+import Regexp from 'path-to-regexp'
+
+// $flow-disable-line
+const regexpCompileCache: {
+  [key: string]: Function
+} = Object.create(null)
+
+export function fillParams (
+  path: string,
+  params: ?Object,
+  routeMsg: string
+): string {
+  params = params || {}
+  try {
+    const filler =
+      regexpCompileCache[path] ||
+      (regexpCompileCache[path] = Regexp.compile(path))
+
+    // Fix #2505 resolving asterisk routes { name: 'not-found', params: { pathMatch: '/not-found' }}
+    // and fix #3106 so that you can work with location descriptor object having params.pathMatch equal to empty string
+    if (typeof params.pathMatch === 'string') params[0] = params.pathMatch
+
+    return filler(params, { pretty: true })
+  } catch (e) {
+    if (process.env.NODE_ENV !== 'production') {
+      // Fix #3072 no warn if `pathMatch` is string
+      warn(typeof params.pathMatch === 'string', `missing param for ${routeMsg}: ${e.message}`)
+    }
+    return ''
+  } finally {
+    // delete the 0 if it was added
+    delete params[0]
+  }
+}