@swc-node/jest ReferenceError: React is not defined

[zfwf]

EDIT: I don't think react runtime is supported by @swc-node at all.@swc-node/loader works in webpack but the bundle produced does not have the react runtime.

Below is the original issue:

my project was using @swc/jest and a .swcrc like this and jest works fine:

{
    "jsc": {
        "parser": {
            "syntax": "typescript",
            "tsx": true,
            "dynamicImport": true,
            "privateMethod": true,
            "functionBind": true,
            "exportDefaultFrom": true,
            "exportNamespaceFrom": true,
            "decorators": true,
            "decoratorsBeforeExport": true,
            "topLevelAwait": true,
            "importMeta": true
        },
        "transform": {
            "react": {
                "runtime": "automatic"
            }
        },
        "target": "es5",
        "loose": false,
        "externalHelpers": false,
        "keepClassNames": false
    }
}

I want to move to @swc-node/jest since I already have a tsconfig.json and I don't see a need to maintain both the .swcrc and tsconfig.json.

{
  "compilerOptions": {
    "target": "es5",
    "lib": [
      "dom",
      "dom.iterable",
      "esnext"
    ],
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx",
    "noFallthroughCasesInSwitch": true,
    "suppressImplicitAnyIndexErrors": true,
    "noImplicitAny": false,
    "sourceMap": true,
  },
  "include": [
    "src"
  ]
}

I changed jest config from "^.+\\.(t|j)sx?$": "@swc/jest", to "^.+\\.(t|j)sx?$": "@swc-node/jest", and got error ReferenceError: React is not defined. I copied the configs in .swcrc from above into jest config and still got the same error. It seems the react runtime configuration is not applied by @swc-node/jest but am applied by @swc/jest?

[Gabb-c]

I'm building my react lib with Rollup, and just using @swc/jest for the tests:

const config = {
...config,
  transform: {
    '^.+\\.(t|j)sx?$': [
      '@swc/jest',
      {
        jsc: {
          transform: {
            react: {
              runtime: 'automatic',
            },
          },
        },
      },
    ],
  },
};

So there's no need to have a .swcrc in this case. Reference

[AndrewSouthpaw]

https://github.com/swc-project/swc-node/issues/635#issuecomment-1070766669 was key for me. For some reason it didn't work in .swcrc but worked fine when passed directly into the jest config. 🤷🏼‍♂️