确保node_modules目录中只有一个“graphql”实例

Question

尝试使用npm run schema:download下载架构时，我收到以下错误。

my-app@0.1.0模式：下载npx-apollo服务：下载--endpoint=http://localhost:9000/graphql./src/app/grapql-schema.json

✔加载阿波罗项目✖保存模式。/src/app/graphql-schema.json →虚假结果。错误:无法使用graphql Schema " { _ _ validation errors:undefined，extensions: undefined，astNode: undefined，extensionASTNodes: undefined，_ _ allowed legacyanames:[]，_queryType: Query，_mutationType: Mutation，_subscriptionType: null，_directives: [@include，@skip，@deprecated，@specifiedBy]，_typeMap: { Query: Query，Car: Car，String: String，Float: Float，Mutation: Mutation，NewCarInput: NewCarInput，Int，_ _ Schema:_ _

Ensure that there is only one instance of "graphql" in the node_modules
directory. If different versions of "graphql" are the dependencies of other
relied on modules, use "resolutions" to ensure only one version is installed.

https://yarnpkg.com/en/docs/selective-version-resolutions

Duplicate "graphql" modules cannot be used at the same time since different
versions may have different capabilities and behavior. The data from one
version used in the function from another could produce confusing and
spurious results.

我已经在我的package.json中提供了schema：download的endpoint，如下所示。

  "scripts": {
"start": "craco start",
"build": "craco build",
"test": "craco test",
"eject": "react-scripts eject",
"schema:download": "npx apollo service:download --endpoint=http://localhost:9000/graphql ./src/app/graphql-schema.json",
"schema:generate-watch": "npx apollo codegen:generate --localSchemaFile=./src/app/graphql-schema.json --target=typescript --tagName=gql --watch"

},

我刚接触graphql，有人能帮我解决这个问题吗

Answer 1

就我而言，问题是我还全局安装了 graphql。删除它修复了错误：

纱线全局删除图形ql

npm等效值为：

npm卸载-g图ql

只是要小心，不要依赖全局安装来安装系统上的其他东西。

Answer 2

我在包中将graphql切换到v15.7.2。json，它对我有用。