Stryker run fails with "UnexpectedToken" error

[p-saxena]

Question

I am new to mutation testing and excited to introduce it to my team as part of our testing strategy. However, I am getting an error when trying to run (npx stryker run) it for the first time in our React frontend project. I would really appreciate all the help I can get to resolve this error. More details on it are below.

Stryker environment

+-- @stryker-mutator/[email protected]
+-- @stryker-mutator/[email protected]

Stryker config

{
  "testRunner": "jest",
  "reporters": [
    "progress",
    "clear-text",
    "html"
  ],
  "coverageAnalysis": "off",
  "jest": {
    "projectType": "create-react-app"
  },
  "logLevel": "trace",
  "allowConsoleColors": true,
  "checkers": [],
  "checkerNodeArgs": [],
  "commandRunner": {
    "command": "npm test"
  },
  "clearTextReporter": {
    "allowColor": true,
    "allowEmojis": false,
    "logTests": true,
    "maxTestsToLog": 3,
    "reportTests": true,
    "reportMutants": true,
    "reportScoreTable": true
  },
  "dashboard": {
    "baseUrl": "https://dashboard.stryker-mutator.io/api/reports",
    "reportType": "full"
  },
  "dryRunOnly": false,
  "eventReporter": {
    "baseDir": "reports/mutation/events"
  },
  "ignorePatterns": [],
  "ignoreStatic": false,
  "incremental": false,
  "incrementalFile": "reports/stryker-incremental.json",
  "force": false,
  "fileLogLevel": "off",
  "inPlace": false,
  "maxConcurrentTestRunners": 9007199254740991,
  "maxTestRunnerReuse": 0,
  "mutate": [
    "{src,lib}/**/!(*.+(s|S)pec|*.+(t|T)est).+(cjs|mjs|js|ts|mts|cts|jsx|tsx|html|vue|svelte)",
    "!{src,lib}/**/__tests__/**/*.+(cjs|mjs|js|ts|mts|cts|jsx|tsx|html|vue|svelte)"
  ],
  "mutator": {
    "plugins": null,
    "excludedMutations": []
  },
  "plugins": [
    "@stryker-mutator/*"
  ],
  "appendPlugins": [],
  "htmlReporter": {
    "fileName": "reports/mutation/mutation.html"
  },
  "jsonReporter": {
    "fileName": "reports/mutation/mutation.json"
  },
  "disableTypeChecks": true,
  "symlinkNodeModules": true,
  "tempDirName": ".stryker-tmp",
  "cleanTempDir": true,
  "testRunnerNodeArgs": [],
  "thresholds": {
    "high": 80,
    "low": 60,
    "break": null
  },
  "timeoutFactor": 1.5,
  "timeoutMS": 5000,
  "dryRunTimeoutMinutes": 5,
  "tsconfigFile": "tsconfig.json",
  "warnings": true,
  "disableBail": false,
  "allowEmpty": false,
  "ignorers": []
}

package.json

{
  "version": "3.372.0",
  "main": "server",
  "private": true,
  "license": "UNLICENSED",
  "dependencies": {
    "@react-hook/debounce": "^4.0.0",
    "apollo-datasource-rest": "^3.7.0",
    "aws-sdk": "^2.419.0",
    "body-parser": "1.18.3",
    "compression": "1.7.3",
    "connect-redis": "3.4.0",
    "cookie-parser": "^1.4.5",
    "dataloader": "^2.0.0",
    "dd-trace": "5.10.0",
    "debounce": "^1.2.1",
    "express": "4.16.4",
    "express-session": "1.15.6",
    "helmet": "^3.16.0",
    "isomorphic-fetch": "2.2.1",
    "query-string": "5.1.1",
    "ramda": "0.25.0",
    "react-table": "^7.7.0",
    "react-tabs": "^4",
    "request": "2.88.0",
    "ts-jest": "^27",
    "xlsx": "0.12.10"
  },
  "devDependencies": {
    "@apollo/client": "^3.5.6",
    "@braze/web-sdk": "^4.8.3",
    "@datadog/browser-rum": "^4.39.0",
    "@googlemaps/markerclustererplus": "^1.1.0",
    "@orq/superagent": "0.4.1",
    "@stryker-mutator/core": "^8.2.6",
    "@stryker-mutator/jest-runner": "^8.2.6",
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^12.1.2",
    "@typescript-eslint/eslint-plugin": "^4",
    "@typescript-eslint/parser": "^5.25.0",
    "amplitude-js": "4",
    "apollo-server-express": "^2.18.2",
    "apollo-server-testing": "^2.21.1",
    "big.js": "^5",
    "chokidar-cli": "1.2.1",
    "classnames": "2.2.6",
    "csv-parse": "2.2.0",
    "d3": "^6.2.0",
    "dotenv": "6.2.0",
    "eslint-config-prettier": "^6.15.0",
    "eslint-import-resolver-typescript": "^2.7.1",
    "eslint-import-resolver-webpack": "^0.11.0",
    "eslint-plugin-import": "^2.26.0",
    "flow-bin": "^0.108.0",
    "flow-typed": "2.4.0",
    "folktale": "2.3.1",
    "got": "^9.6.0",
    "history": "^4.9.0",
    "http-proxy": "1.17.0",
    "husky": "^4",
    "jest-fetch-mock": "^3.0.3",
    "jest-styled-components": "^7.0.8",
    "js-cookie": "^2.2.1",
    "lint-staged": "^10.5.4",
    "lolex": "2.3.2",
    "marked": "0.3.19",
    "material-ui": "0.20.2",
    "mobx": "3.3.1",
    "mobx-react": "4.3.4",
    "moment": "^2.22.2",
    "nock": "9.2.5",
    "normalize.css": "8.0.1",
    "orq": "^0.3.0",
    "parse-decimal-number": "^1.0.0",
    "pdfjs-dist": "2.0.489",
    "prettier": "^2.2.0",
    "prop-types": "15.6.2",
    "react": "18.2.0",
    "react-dom": "18.2.0",
    "react-dropzone": "4.2.9",
    "react-ink": "6.4.0",
    "react-is": "18.2.0",
    "react-redux": "5.0.7",
    "react-router-config": "^5",
    "react-router-dom": "^5",
    "react-test-renderer": "18.2.0",
    "react-tunnels": "1.1.0",
    "redux": "4.0.1",
    "redux-actions": "2.3.0",
    "redux-promise-middleware": "5.1.1",
    "redux-thunk": "2.3.0",
    "reselect": "3.0.1",
    "rxjs": "5.5.10",
    "semver": "5.6.0",
    "spacetime": "7.4.7",
    "styled-components": "^5.2.1",
    "stylelint": "^13.11.0",
    "stylelint-config-prettier": "^8.0.2",
    "stylelint-config-styled-components": "^0.1.1",
    "stylelint-processor-styled-components": "^1.10.0",
    "typescript": "^4.3.4",
    "uuid": "^8.3.2"
  },
  "engines": {
    "node": "20"
  },
  "jest": {
    "testURL": "https://xxxxxx.com",
    "setupFilesAfterEnv": [
      "<rootDir>/__mocks__/automock"
    ],
    "setupFiles": [
      "<rootDir>/__mocks__/time"
    ],
    "moduleNameMapper": {
      "@braze/web-sdk": "<rootDir>/__mocks__/jestMockBraze.js"
    },
    "testPathIgnorePatterns": [
      "<rootDir>/node_modules/",
      "<rootDir>/cypress/",
      "dist"
    ],
    "testRegex": "(/__tests__/.*)\\.(j|t)sx?$",
    "transform": {
      "\\.ts": "ts-jest"
    },
    "collectCoverage": true,
    "coverageReporters": [
      "html",
      "text"
    ],
    "coverageDirectory": "coverage",
    "preset": "ts-jest",
    "moduleFileExtensions": [
      "ts",
      "js",
      "json"
    ]
  },
}

Stryker log

21:02:00 (97983) DEBUG PluginLoader Loading @stryker-mutator/* from /Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator
21:02:00 (97983) DEBUG PluginLoader Loading plugin "@stryker-mutator/jest-runner" (matched with expression @stryker-mutator/*)
21:02:00 (97983) DEBUG PluginLoader Loading plugin @stryker-mutator/jest-runner
21:02:00 (97983) DEBUG PluginLoader Loading plugin file:///Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/core/dist/src/reporters/index.js
21:02:00 (97983) DEBUG MetaSchemaBuilder Contributing 1 schemas from plugins to options validation.
21:02:02 (97983) INFO ProjectReader Found 1136 of 2847 file(s) to be mutated.

21:02:02 (97983) DEBUG TemporaryDirectory Using temp directory "/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/.stryker-tmp"
21:02:02 (97983) DEBUG Instrumenter Instrumenting 1136 source files with mutants
21:02:02 (97983) DEBUG Stryker Not removing the temp dir because an error occurred
21:02:02 (97983) ERROR Stryker Unexpected error occurred while running Stryker SyntaxError: /Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/src/client/bffmodelhydrators/Reminder/__fixtures__/index.js: Unexpected token, expected "," (8:7)

   6 | import { fixedMkReminders } from '#models/Reminders/__fixtures__'
   7 | import mkRemindersViews, {
>  8 |   type RemindersViews,
     |        ^
   9 |   type RemindersViewsOptions,
  10 | } from '../'
  11 |
    at constructor (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:353:19)
    at V8IntrinsicMixin.raise (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:3277:19)
    at V8IntrinsicMixin.unexpected (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:3297:16)
    at V8IntrinsicMixin.expect (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:3601:28)
    at V8IntrinsicMixin.parseNamedImportSpecifiers (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:13853:14)
    at V8IntrinsicMixin.parseImportSpecifiersAndAfter (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:13694:37)
    at V8IntrinsicMixin.parseImport (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:13687:17)
    at V8IntrinsicMixin.parseStatementContent (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:12347:27)
    at V8IntrinsicMixin.parseStatementLike (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:12239:17)
    at V8IntrinsicMixin.parseModuleItem (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:12216:17)
    at V8IntrinsicMixin.parseBlockOrModuleBlockBody (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:12796:36)
    at V8IntrinsicMixin.parseBlockBody (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:12789:10)
    at V8IntrinsicMixin.parseProgram (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:12116:10)
    at V8IntrinsicMixin.parseTopLevel (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:12106:25)
    at V8IntrinsicMixin.parse (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:13905:10)
    at parse (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/node_modules/@babel/parser/lib/index.js:13947:38)
    at parser (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/lib/parser/index.js:41:34)
    at parser.next (<anonymous>)
    at parse (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/lib/parse.js:25:37)
    at parse.next (<anonymous>)
    at step (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/gensync/index.js:261:32)
    at /Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/gensync/index.js:273:13
    at async.call.result.err.err (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/gensync/index.js:223:11)
    at /Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/gensync/index.js:189:28
    at /Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/@stryker-mutator/instrumenter/node_modules/@babel/core/lib/gensync-utils/async.js:67:7
    at /Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/gensync/index.js:113:33
    at step (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/gensync/index.js:287:14)
    at /Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/gensync/index.js:273:13
    at async.call.result.err.err (/Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/gensync/index.js:223:11)
    at /Users/prateeksaxena/IdeaProjects/vimcar-frontend-fleet/node_modules/gensync/index.js:189:28
    at FSReqCallback.readFileAfterClose [as oncomplete] (node:internal/fs/read/context:68:3) {
  code: 'BABEL_PARSE_ERROR',
  reasonCode: 'UnexpectedToken',
  loc: Position { line: 8, column: 7, index: 260 },
  pos: 260
}