中继编译器无法在 Typescript 中提取和使用 graphql 查询

Question

I tried using relay with the Typescript react starter , and am running into multiple issues.

Seems like babel-plugin-relay is not able to sense the graphql statements extracted by the relay-compiler. Here is my compiler script

"relay": "relay-compiler --src ./src --schema ./src/schema.graphql --extensions=tsx --watchman false".

.babelrc

{
   "babel": {
   "presets": [
      "react-app"
   ],
   "plugins": [
     "relay"
   ]
}

This is my error which suggests an issue with babel transpilation

graphql: Unexpected invocation at runtime. Either the Babel transform was not set up, or it failed to identify this call site. Make sure it is being used verbatim as `graphql`.

Answer 1

Essentially the problem resolves around pulling out the GraphQL tags from typescript during transformations. I figured out the solution thanks to work in these PRs #1710 and #2293 .

Here are the steps:

Modify the webpack config to include a babel loader (the typescript starter only has a ts-loader).

    ...
    test: /\.(ts|tsx)$/,
    include: paths.appSrc,
    exclude: /node_modules/,
    use: [
       { loader: 'babel-loader' },
       {
         loader: require.resolve('ts-loader'),
         options: {
            transpileOnly: true,
         },
       },
    ],
    ...

Change the target and module configuration in tsconfig to es2015

...
"target": "es2015",
"module": "es2015",
...

Add relay-compiler-language-typescript

yarn add relay-compiler-language-typescript -D

Also add babel-plugin-transform-es2015-modules-commonjs .

yarn add babel-plugin-transform-es2015-modules-commonjs -D

Since now we are targetting es2015, this plugin is needed to support ES module import and export statements.

And a script to compile graphql statements

"relay": "relay-compiler --src ./src --schema src/schema.graphql --language typescript --artifactDirectory ./src/__generated__ --watch"

Point the relay plugin to use the artifacts generated by the above command in .babelrc

"plugins": [
    "transform-es2015-modules-commonjs",
    ["relay", { "artifactDirectory": "./src/__generated__" }],
 ],

Answer 2

My.babelrc looks like this

{
    "plugins": [
        [
            // Please note that the "relay" plugin should run before other plugins or presets to ensure the graphql template literals are correctly transformed. See Babel's documentation on this topic.
            "relay",
            {
                "artifactDirectory": "./src/__generated__"
            }
        ],
        [
            "transform-es2015-modules-commonjs",
            {
                "allowTopLevelThis": true
            }
        ]
    ]
}

Follow the configuration steps here https://github.com/relay-tools/relay-compiler-language-typescript#typescript

that will link you to babel docs https://babeljs.io/docs/en/babel-plugin-transform-es2015-modules-commonjs/

this seems to be working. my npm script is

"relay": "relay-compiler --src./src --schema./data/schema.graphql --language typescript --artifactDirectory./src/__generated__"

and tsconfig.json contains this

    "target": "es2015",
    "module": "es2015",

Update

I had to install babel-plugin-relay as described here https://create-react-app.dev/docs/adding-relay/

and hack the typescript types for ithttps://github.com/DefinitelyTyped/DefinitelyTyped/issues/35707