问题
I am creating my first react-native app. I am attempting to install the react-native command line interface as shown here. I keep getting an error when I type the command to initiate the react-native command line
- OS: Windows 10
- Node: 10.15.3
- npm: 6.4.1
I am not behind a proxy
I have removed the http and https environment variables
- Updating node and npm creates a different error as shown here
Here's the error
C:\>npm install -g react-native-cli
npm ERR! Cannot read property 'startsWith' of null
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\dnort\AppData\Roaming\npm-cache\_logs\2019-04-15T09_52_28_346Z-debug.log
Here's npm get registry
C:\>npm get registry
https://registry.npmjs.org/
Here's npm config get proxy
C:\>npm config get proxy
null
Here's npm config get http-proxy
C:\>npm config get http-proxy
undefined
Here's npm config get https-proxy
C:\>npm config get https-proxy
null
Here's the log file
0 info it worked if it ends with ok
1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli 'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli 'install',
1 verbose cli '-g',
1 verbose cli 'react-native-cli' ]
2 info using npm@6.4.1
3 info using node@v10.15.3
4 verbose npm-session 8e6a6f9ef2e9298d
5 silly install loadCurrentTree
6 silly install readGlobalPackageData
7 silly fetchPackageMetaData error for react-native-cli@latest Cannot read property 'startsWith' of null
8 timing stage:rollbackFailedOptional Completed in 7ms
9 timing stage:runTopLevelLifecycles Completed in 1811ms
10 verbose stack TypeError: Cannot read property 'startsWith' of null
10 verbose stack at getProxy (C:\Program Files\nodejs\node_modules\npm\node_modules\make-fetch-happen\agent.js:164:25)
10 verbose stack at getAgent (C:\Program Files\nodejs\node_modules\npm\node_modules\make-fetch-happen\agent.js:37:19)
10 verbose stack at remoteFetch (C:\Program Files\nodejs\node_modules\npm\node_modules\make-fetch-happen\index.js:310:17)
10 verbose stack at opts.cacheManager.match.then.res (C:\Program Files\nodejs\node_modules\npm\node_modules\make-fetch-happen\index.js:172:14)
10 verbose stack at tryCatcher (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\util.js:16:23)
10 verbose stack at Promise._settlePromiseFromHandler (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:512:31)
10 verbose stack at Promise._settlePromise (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:569:18)
10 verbose stack at Promise._settlePromise0 (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:614:10)
10 verbose stack at Promise._settlePromises (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:693:18)
10 verbose stack at Promise._fulfill (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:638:18)
10 verbose stack at Promise._resolveCallback (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:432:57)
10 verbose stack at Promise._settlePromiseFromHandler (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:524:17)
10 verbose stack at Promise._settlePromise (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:569:18)
10 verbose stack at Promise._settlePromise0 (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:614:10)
10 verbose stack at Promise._settlePromises (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:693:18)
10 verbose stack at Promise._fulfill (C:\Program Files\nodejs\node_modules\npm\node_modules\bluebird\js\release\promise.js:638:18)
11 verbose cwd C:\
12 verbose Windows_NT 10.0.17134
13 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "-g" "react-native-cli"
14 verbose node v10.15.3
15 verbose npm v6.4.1
16 error Cannot read property 'startsWith' of null
17 verbose exit [ 1, true ]
I expect to install the react-native command line to be able to initiate react-native projects.
EDIT Please see the npm config ls -l input below
C:\Windows\System32>npm config ls -l
; cli configs
long = true
metrics-registry = "https://registry.npmjs.org/"
scope = ""
user-agent = "npm/6.4.1 node/v10.15.3 win32 x64"
; userconfig C:\Users\dnort\.npmrc
https-proxy = null
proxy = null
strict-ssl = false
; builtin config undefined
prefix = "C:\\Users\\dnort\\AppData\\Roaming\\npm"
; default values
access = null
allow-same-version = false
also = null
always-auth = false
audit = true
audit-level = "low"
auth-type = "legacy"
bin-links = true
browser = null
ca = null
cache = "C:\\Users\\dnort\\AppData\\Roaming\\npm-cache"
cache-lock-retries = 10
cache-lock-stale = 60000
cache-lock-wait = 10000
cache-max = null
cache-min = 10
cafile = undefined
cert = null
cidr = null
color = true
commit-hooks = true
depth = null
description = true
dev = false
dry-run = false
editor = "notepad.exe"
engine-strict = false
fetch-retries = 2
fetch-retry-factor = 10
fetch-retry-maxtimeout = 60000
fetch-retry-mintimeout = 10000
force = false
git = "git"
git-tag-version = true
global = false
global-style = false
globalconfig = "C:\\Users\\dnort\\AppData\\Roaming\\npm\\etc\\npmrc"
globalignorefile = "C:\\Users\\dnort\\AppData\\Roaming\\npm\\etc\\npmignore"
group = 0
ham-it-up = false
heading = "npm"
https-proxy = null
if-present = false
ignore-prepublish = false
ignore-scripts = false
init-author-email = ""
init-author-name = ""
init-author-url = ""
init-license = "ISC"
init-module = "C:\\Users\\dnort\\.npm-init.js"
init-version = "1.0.0"
json = false
key = null
legacy-bundling = false
link = false
local-address = undefined
loglevel = "notice"
logs-max = 10
; long = false (overridden)
maxsockets = 50
message = "%s"
; metrics-registry = null (overridden)
node-options = null
node-version = "10.15.3"
noproxy = null
offline = false
onload-script = null
only = null
optional = true
otp = null
package-lock = true
package-lock-only = false
parseable = false
prefer-offline = false
prefer-online = false
; prefix = "C:\\Program Files\\nodejs" (overridden)
preid = ""
production = false
progress = true
proxy = null
read-only = false
rebuild-bundle = true
registry = "https://registry.npmjs.org/"
rollback = true
save = true
save-bundle = false
save-dev = false
save-exact = false
save-optional = false
save-prefix = "^"
save-prod = false
scope = ""
script-shell = null
scripts-prepend-node-path = "warn-only"
searchexclude = null
searchlimit = 20
searchopts = ""
searchstaleness = 900
send-metrics = false
shell = "C:\\WINDOWS\\system32\\cmd.exe"
shrinkwrap = true
sign-git-commit = false
sign-git-tag = false
sso-poll-frequency = 500
sso-type = "oauth"
; strict-ssl = true (overridden)
tag = "latest"
tag-version-prefix = "v"
timing = false
tmp = "C:\\Users\\dnort\\AppData\\Local\\Temp"
umask = 0
unicode = false
unsafe-perm = true
update-notifier = true
usage = false
user = 0
; user-agent = "npm/{npm-version} node/{node-version} {platform} {arch}" (overridden)
userconfig = "C:\\Users\\dnort\\.npmrc"
version = false
versions = false
viewer = "browser"
回答1:
There was no proxy set in my configs in npm. I tried npm config get proxy it was null.
Try this link
回答2:
Solution found
- Uninstall current version of node.js and npm from C:\Users{your_username}\AppData\Roaming
- Install an older version of node.js. You can do that here. At the time of this post I installed the LTS (Node-10.15.3 & npm-6.4.1).
- Remove http & https environment variables. (type in environment variables in search bar which should take your straight to system variables).
- Temporarily disable windows defender features.
- Restart system
- Open administrator node.js command prompt
- Enter npm install -g react-native-cli
My result output is now as expected:
C:\Windows\System32>npm install -g react-native-cli
C:\Users\dnort\AppData\Roaming\npm\react-native -> C:\Users\dnort\AppData\Roaming\npm\node_modules\react-native-cli\index.js
+ react-native-cli@2.0.1
added 41 packages from 15 contributors in 19.22s
This post is a continuation of my 'How to fix 'npm does not support Node.js v11.14.0 error' on Windows?' here
Note: Most solutions to similar problems have been related to proxy issues, unsupported versions of node.js/npm, environment variables
回答3:
this may occur cause of coding error, in my case this line caused error
<img class="cat-icon" v-bind:src="require('img/icon/' + icon)" style="width:25px;" />
try to run "npm run watch" to see detailed error
回答4:
I ran in to similar problem which was caused by wrong ralative path when registring components by require.context
回答5:
I have tried a variety of commands to delete proxy settings. I found that the best way to clear out proxy settings is to clear out related entry in .npmrc. In my case, I simply empty the whole file and restart cmd. And it works.
回答6:
This helped me:
npm config set proxy http://username:password@host:port
npm config set https-proxy http://username:password@host:port
来源：https://stackoverflow.com/questions/55686843/how-to-fix-npm-err-cannot-read-property-startswith-of-null