deps: make "only" package inside (#1824)

closes https://github.com/koajs/koa/issues/1802

lib/application.js

@@ -16,7 +16,7 @@ const Emitter = require('events')
 const util = require('util')
 const Stream = require('stream')
 const http = require('http')
-const only = require('only')
+const only = require('./only.js')
 const { HttpError } = require('http-errors')
 
 /** @typedef {typeof import ('./context') & {

lib/only.js

@@ -0,0 +1,11 @@
+module.exports = (obj, keys) => {
+  obj = obj || {}
+  if (typeof keys === 'string') keys = keys.split(/ +/)
+  const ret = {}
+  for (let i = 0; i < keys.length; i++) {
+    const key = keys[i]
+    if (obj[key] == null) continue
+    ret[key] = obj[key]
+  }
+  return ret
+}

lib/request.js

@@ -13,7 +13,7 @@ const parse = require('parseurl')
 const qs = require('querystring')
 const typeis = require('type-is')
 const fresh = require('fresh')
-const only = require('only')
+const only = require('./only.js')
 const util = require('util')
 
 const IP = Symbol('context#ip')

lib/response.js

@@ -14,7 +14,7 @@ const destroy = require('destroy')
 const assert = require('assert')
 const extname = require('path').extname
 const vary = require('vary')
-const only = require('only')
+const only = require('./only.js')
 const util = require('util')
 const encodeUrl = require('encodeurl')
 const Stream = require('stream')

package-lock.json

@@ -24,7 +24,6 @@
         "http-errors": "^1.6.3",
         "koa-compose": "^4.1.0",
         "on-finished": "^2.3.0",
-        "only": "~0.0.2",
         "parseurl": "^1.3.2",
         "statuses": "^1.5.0",
         "type-is": "^1.6.16",
@@ -5380,11 +5379,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/only": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/only/-/only-0.0.2.tgz",
-      "integrity": "sha1-Kv3oTQPlC5qO3EROMGEKcCle37Q="
-    },
     "node_modules/optionator": {
       "version": "0.9.3",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.3.tgz",

package.json

@@ -51,7 +51,6 @@
     "http-errors": "^1.6.3",
     "koa-compose": "^4.1.0",
     "on-finished": "^2.3.0",
-    "only": "~0.0.2",
     "parseurl": "^1.3.2",
     "statuses": "^1.5.0",
     "type-is": "^1.6.16",