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Next.js Jest 28 - Can't transform SVG files

Time：06-13

I am using Next.js 12.0.7 and Jest 28.1.0. And, also using the next-react-svg library to import my SVG files into the components. Here is my jest.config.js file -

// jest.config.js

const nextJest = require("next/jest");

const createJestConfig = nextJest({
  dir: "./",
});

const customJestConfig = {
  setupFilesAfterEnv: ["<rootDir>/jest.setup.js"],
  moduleNameMapper: {
    "^@/(.*)$": "<rootDir>/src/$1",
  },
  moduleDirectories: ["node_modules", "<rootDir>/"],
  modulePathIgnorePatterns: ["<rootDir>/tests/"],
  testEnvironment: "jest-environment-jsdom",
  transform: {
    "^. \\.tsx?$": "ts-jest",
    "^. \\.svg$": "<rootDir>/__mocks__/jest-svg-transformer.js",
  },
};

module.exports = createJestConfig(customJestConfig);

And here is the jest-svg-transformer.js file where I am trying to mock the SVG files -

// __mocks__/jest-svg-transformer.js

const path = require("path");

module.exports = {
  process(src, filePath) {
    if (path.extname(filePath) !== ".svg") {
      return src;
    }

    const name = `svg-${path.basename(filePath, ".svg")}`
      .split(/\W /)
      .map((x) => `${x.charAt(0).toUpperCase()}${x.slice(1)}`)
      .join("");

    return `
      const React = require('react');
      function ${name}(props) {
        return React.createElement(
          'svg',
          Object.assign({}, props, {'data-file-name': ${name}.name})
        )
      }
      module.exports = ${name}
            `;
  },
};

I have mentioned the error below which I'm getting when trying to run yarn test or jest.

Warning: React.jsx: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: object.
    
    Check the render method of `Loader`.
        at text (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/src/modules/common/components/Loader/index.tsx:5:34)
        at div
        at LoginPage (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/src/modules/auth/components/LoginPage/index.tsx:17:47)
        at Login
        at Provider (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-redux/lib/components/Provider.js:21:20)

      15 |         <p className={styles.text}>
      16 |           <small>{text}</small>
    > 17 |         </p>
         |                                                     ^
      18 |       ) : (
      19 |         ""
      20 |       )}

      at printWarning (node_modules/react/cjs/react-jsx-runtime.development.js:117:30)
      at error (node_modules/react/cjs/react-jsx-runtime.development.js:93:5)
      at jsxWithValidation (node_modules/react/cjs/react-jsx-runtime.development.js:1152:7)
      at Object.jsxWithValidationDynamic [as jsx] (node_modules/react/cjs/react-jsx-runtime.development.js:1209:12)
      at Loader (src/modules/common/components/Loader/index.tsx:17:58)
      at renderWithHooks (node_modules/react-dom/cjs/react-dom.development.js:14985:18)
      at mountIndeterminateComponent (node_modules/react-dom/cjs/react-dom.development.js:17811:13)

  console.error
    Error: Uncaught [Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.
    
    Check the render method of `Loader`.]
        at reportException (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/helpers/runtime-script-errors.js:66:24)
        at innerInvokeEventListeners (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:343:9)
        at invokeEventListeners (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:276:3)
        at HTMLUnknownElementImpl._dispatch (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:223:9)
        at HTMLUnknownElementImpl.dispatchEvent (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:94:17)
        at HTMLUnknownElement.dispatchEvent (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/generated/EventTarget.js:241:34)
        at Object.invokeGuardedCallbackDev (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:3994:16)
        at invokeGuardedCallback (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:4056:31)
        at beginWork$1 (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:23964:7)
        at performUnitOfWork (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:22779:12) {
      detail: Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.
      
      Check the render method of `Loader`.
          at createFiberFromTypeAndProps (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:25058:21)
          at createFiberFromElement (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:25086:15)
          at reconcileSingleElement (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:14052:23)
          at reconcileChildFibers (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:14112:35)
          at reconcileChildren (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:16990:28)
          at updateHostComponent (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:17632:3)
          at beginWork (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:19080:14)
          at HTMLUnknownElement.callCallback (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:3945:14)
          at HTMLUnknownElement.callTheUserObjectsOperation (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/generated/EventListener.js:26:30)
          at innerInvokeEventListeners (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:340:25)
          at invokeEventListeners (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:276:3)
          at HTMLUnknownElementImpl._dispatch (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:223:9)
          at HTMLUnknownElementImpl.dispatchEvent (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:94:17)
          at HTMLUnknownElement.dispatchEvent (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jsdom/lib/jsdom/living/generated/EventTarget.js:241:34)
          at Object.invokeGuardedCallbackDev (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:3994:16)
          at invokeGuardedCallback (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:4056:31)
          at beginWork$1 (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:23964:7)
          at performUnitOfWork (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:22779:12)
          at workLoopSync (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:22707:5)
          at renderRootSync (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:22670:7)
          at performSyncWorkOnRoot (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:22293:18)
          at scheduleUpdateOnFiber (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:21881:7)
          at updateContainer (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:25482:3)
          at /Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:26021:7
          at unbatchedUpdates (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:22431:12)
          at legacyRenderSubtreeIntoContainer (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:26020:5)
          at Object.render (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:26103:10)
          at /Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/@testing-library/react/dist/pure.js:101:25
          at batchedUpdates$1 (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom.development.js:22380:12)
          at act (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-dom/cjs/react-dom-test-utils.development.js:1042:14)
          at Object.render (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/@testing-library/react/dist/pure.js:97:26)
          at Object.<anonymous> (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/__tests__/index.test.tsx:9:11)
          at Promise.then.completed (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-circus/build/utils.js:333:28)
          at new Promise (<anonymous>)
          at callAsyncCircusFn (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-circus/build/utils.js:259:10)
          at _callCircusTest (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-circus/build/run.js:277:40)
          at processTicksAndRejections (node:internal/process/task_queues:95:5)
          at _runTest (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-circus/build/run.js:209:3)
          at _runTestsForDescribeBlock (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-circus/build/run.js:97:9)
          at _runTestsForDescribeBlock (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-circus/build/run.js:91:9)
          at run (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-circus/build/run.js:31:3)
          at runAndTransformResultsToJestFormat (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-circus/build/legacy-code-todo-rewrite/jestAdapterInit.js:135:21)
          at jestAdapter (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-circus/build/legacy-code-todo-rewrite/jestAdapter.js:92:19)
          at runTestInternal (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-runner/build/runTest.js:411:16)
          at runTest (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-runner/build/runTest.js:499:34)
          at TestRunner.runTests (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-runner/build/index.js:145:12)
          at TestScheduler.scheduleTests (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/@jest/core/build/TestScheduler.js:317:13)
          at runJest (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/@jest/core/build/runJest.js:407:19)
          at _run10000 (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/@jest/core/build/cli/index.js:339:7)
          at runCLI (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/@jest/core/build/cli/index.js:190:3)
          at Object.run (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/jest-cli/build/cli/index.js:155:37),
      type: 'unhandled exception'
    }

      at VirtualConsole.<anonymous> (node_modules/jest-environment-jsdom/build/index.js:70:23)
      at reportException (node_modules/jsdom/lib/jsdom/living/helpers/runtime-script-errors.js:70:28)
      at innerInvokeEventListeners (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:343:9)
      at invokeEventListeners (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:276:3)
      at HTMLUnknownElementImpl._dispatch (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:223:9)
      at HTMLUnknownElementImpl.dispatchEvent (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:94:17)

  console.error
    The above error occurred in the <div> component:
    
        at div
        at div
        at text (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/src/modules/common/components/Loader/index.tsx:5:34)
        at div
        at LoginPage (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/src/modules/auth/components/LoginPage/index.tsx:17:47)
        at Login
        at Provider (/Users/prosenjitchowdhury/dev/multiplyr/dhaka-frontend/node_modules/react-redux/lib/components/Provider.js:21:20)
    
    Consider adding an error boundary to your tree to customize error handling behavior.
    Visit https://reactjs.org/link/error-boundaries to learn more about error boundaries.

      at logCapturedError (node_modules/react-dom/cjs/react-dom.development.js:20085:23)
      at update.callback (node_modules/react-dom/cjs/react-dom.development.js:20118:5)
      at callCallback (node_modules/react-dom/cjs/react-dom.development.js:12318:12)
      at commitUpdateQueue (node_modules/react-dom/cjs/react-dom.development.js:12339:9)
      at commitLifeCycles (node_modules/react-dom/cjs/react-dom.development.js:20736:11)
      at commitLayoutEffects (node_modules/react-dom/cjs/react-dom.development.js:23426:7)
      at HTMLUnknownElement.callCallback (node_modules/react-dom/cjs/react-dom.development.js:3945:14)

 FAIL  __tests__/index.test.tsx
  Home
    ✕ renders a heading (37 ms)

  ● Home › renders a heading

    Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

    Check the render method of `Loader`.

       7 | describe("Home", () => {
       8 |   it("renders a heading", () => {
    >  9 |     render(
         |           ^
      10 |       <Provider store={store}>
      11 |         <Login />
      12 |       </Provider>

      at createFiberFromTypeAndProps (node_modules/react-dom/cjs/react-dom.development.js:25058:21)
      at createFiberFromElement (node_modules/react-dom/cjs/react-dom.development.js:25086:15)
      at reconcileSingleElement (node_modules/react-dom/cjs/react-dom.development.js:14052:23)
      at reconcileChildFibers (node_modules/react-dom/cjs/react-dom.development.js:14112:35)
      at reconcileChildren (node_modules/react-dom/cjs/react-dom.development.js:16990:28)
      at updateHostComponent (node_modules/react-dom/cjs/react-dom.development.js:17632:3)
      at beginWork (node_modules/react-dom/cjs/react-dom.development.js:19080:14)
      at HTMLUnknownElement.callCallback (node_modules/react-dom/cjs/react-dom.development.js:3945:14)
      at HTMLUnknownElement.callTheUserObjectsOperation (node_modules/jsdom/lib/jsdom/living/generated/EventListener.js:26:30)
      at innerInvokeEventListeners (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:340:25)
      at invokeEventListeners (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:276:3)
      at HTMLUnknownElementImpl._dispatch (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:223:9)
      at HTMLUnknownElementImpl.dispatchEvent (node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:94:17)
      at HTMLUnknownElement.dispatchEvent (node_modules/jsdom/lib/jsdom/living/generated/EventTarget.js:241:34)
      at Object.invokeGuardedCallbackDev (node_modules/react-dom/cjs/react-dom.development.js:3994:16)
      at invokeGuardedCallback (node_modules/react-dom/cjs/react-dom.development.js:4056:31)
      at beginWork$1 (node_modules/react-dom/cjs/react-dom.development.js:23964:7)
      at performUnitOfWork (node_modules/react-dom/cjs/react-dom.development.js:22779:12)
      at workLoopSync (node_modules/react-dom/cjs/react-dom.development.js:22707:5)
      at renderRootSync (node_modules/react-dom/cjs/react-dom.development.js:22670:7)
      at performSyncWorkOnRoot (node_modules/react-dom/cjs/react-dom.development.js:22293:18)
      at scheduleUpdateOnFiber (node_modules/react-dom/cjs/react-dom.development.js:21881:7)
      at updateContainer (node_modules/react-dom/cjs/react-dom.development.js:25482:3)
      at node_modules/react-dom/cjs/react-dom.development.js:26021:7
      at unbatchedUpdates (node_modules/react-dom/cjs/react-dom.development.js:22431:12)
      at legacyRenderSubtreeIntoContainer (node_modules/react-dom/cjs/react-dom.development.js:26020:5)
      at Object.render (node_modules/react-dom/cjs/react-dom.development.js:26103:10)
      at node_modules/@testing-library/react/dist/pure.js:101:25
      at batchedUpdates$1 (node_modules/react-dom/cjs/react-dom.development.js:22380:12)
      at act (node_modules/react-dom/cjs/react-dom-test-utils.development.js:1042:14)
      at Object.render (node_modules/@testing-library/react/dist/pure.js:97:26)
      at Object.<anonymous> (__tests__/index.test.tsx:9:11)
      at TestScheduler.scheduleTests (node_modules/@jest/core/build/TestScheduler.js:317:13)
      at runJest (node_modules/@jest/core/build/runJest.js:407:19)
      at _run10000 (node_modules/@jest/core/build/cli/index.js:339:7)
      at runCLI (node_modules/@jest/core/build/cli/index.js:190:3)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        0.966 s, estimated 1 s
Ran all test suites.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

This is the test that is failing -

// __tests__/index.test.tsx

import { render, screen } from "@testing-library/react";
import "@testing-library/jest-dom";
import { Provider } from "react-redux";
import { store } from "@/store";
import Login from "@/pages/login";

describe("Home", () => {
  it("renders a heading", () => {
    render(
      <Provider store={store}>
        <Login />
      </Provider>
    );

    const heading = screen.getByTestId("page-loader-element");

    expect(heading).toBeInTheDocument();
  });
});

This is the component that is throwing me the error -

// src/modules/common/components/Loader/index.tsx

import React from "react";
import Logo from "@/assets/icons/Logo.svg";
import styles from "./Loader.module.scss";

export default function Loader({ text }: { text?: string }) {
  return (
    <div
      className="d-flex flex-column justify-content-center align-items-center w-100 my-3"
      data-testid="page-loader-element"
    >
      <div className="animate__animated animate__pulse animate__infinite    infinite">
        <Logo />
      </div>
      {text ? (
        <p className={styles.text}>
          <small>{text}</small>
        </p>
      ) : (
        ""
      )}
    </div>
  );
}

Here is my jest.setup.js file -

// jest.setup.js

import "@testing-library/jest-dom/extend-expect";

These are the versions of the related libraries I'm using -

// package.json

// ...
"dependencies": {
    "next": "^12.0.7",
    "next-react-svg": "1.1.3",
    // ...
},
"devDependencies": {
    // ...
    "@types/jest": "^28.1.1",
    "babel-jest": "^28.1.0",
    "jest": "^28.1.0",
    "jest-cli": "28.1.0",
    "jest-environment-jsdom": "^28.1.0",
    "jest-svg-transformer": "^1.0.0",
    "ts-jest": "^28.0.4",
    "typescript": "4.4.3"
},
"resolutions": {
    "@types/react": "17.0.2",
    "@types/react-dom": "17.0.2"
},
//...

And finally, this is what my current tsconfig.json file looks like -

// tsconfig.json

{
  "compilerOptions": {
    // ...
    "target": "es5",
    "lib": ["dom", "dom.iterable", "esnext"],
    "baseUrl": ".",
    "paths": {
      "@/*": ["src/*"]
    },
  },
  "include": [
    "next-env.d.ts",
    "additional.d.ts",
    "decs.d.ts",
    "**/*.ts",
    "**/*.tsx",
    "jest.setup.js"
  ],
  "exclude": ["node_modules", "playwright.config.ts"],
  "ts-node": {
    "transpileOnly": true,
    "files": true,
    "compilerOptions": {
      "rootDir": "."
    }
  }
}

I tried using the jest-svg-transformer library also. But no luck!

CodePudding user response：

Finally resolved this error by upgrading the Next.js version from 12.0.7 to 12.1.0. As per this official blog (aka changelog) Next.js 12.1 provides a Zero-configuration Jest plugin.

So, here's the simplified jest.config.js file (as per the official documentation) I am using right now:

const nextJest = require("next/jest");

const createJestConfig = nextJest({
  dir: "./",
});

const customJestConfig = {
  setupFilesAfterEnv: ["<rootDir>/jest.setup.js"],
  moduleNameMapper: {
    "^@/(.*)$": "<rootDir>/src/$1", // as all of my files are stored in ./src directory, & I have setup my paths to be compiled as `"@/*": ["src/*"]` in my tsconfig.json file
  },
  moduleDirectories: ["node_modules", "<rootDir>/"],
  modulePathIgnorePatterns: ["<rootDir>/tests/"], // the directory I want jest to ignore
  testEnvironment: "jest-environment-jsdom",
};

module.exports = createJestConfig(customJestConfig);

As you can see here, I am no longer using any mock files to mock or transform my SVG files. And I started using the @svgr/webpack instead of using next-react-svg to import SVG files in my project.

Page link：https//www.codepudding.com/Enterprise/440142.html

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