typescript-checker v6.1.2 incompatability with TypeScript v4.8.2

[ericcornelissen]

Summary

The @stryker-mutator/typescript-checker package (at v6.1.2) does not seem to work when combined with TypeScript v4.8.2. After upgrading from TypeScript v4.7.4, Stryker stopped working with the error TypeError: Cannot read properties of undefined (reading 'modifiedTime') originating from the typescript-checker plugin (see also the stryker.log at the end of this issue).

Stryker config

// stryker.config.cjs
// See also https://github.com/ericcornelissen/webmangler/blob/90274ddbcae32fe094a518502baa516b0e362424/stryker.config.cjs

module.exports = {
  coverageAnalysis: "perTest",
  inPlace: false,
  mutate: [
    `packages/benchmarking/src/**/*.ts`,
    `!**/__tests__/**/*.ts`,
  ],
  commandRunner: {
    command: `npm run test -- benchmarking --unit`,
  },

  timeoutMS: 25000,
  timeoutFactor: 2.5,

  disableTypeChecks: `packages/benchmarking/src/**/*.ts`,
  checkers: ["typescript"],
  tsconfigFile: "tsconfig.build.json",

  reporters: [
    "clear-text",
    "dashboard",
    "html",
    "progress",
  ],
  dashboard: {
    module: "benchmarking",
  },
  htmlReporter: {
    fileName: `_reports/mutation/index.html`,
  },
  thresholds: {
    high: 80,
    low: 70,
    break: 50,
  },

  tempDirName: `.temp/stryker`,
  cleanTempDir: false,
};

Test runner config

Stryker environment

$ npm ls | grep stryker
├── @stryker-mutator/core@6.1.2
├── @stryker-mutator/typescript-checker@6.1.2

$ npm ls | grep mocha
├── mocha@10.0.0

$ npm ls | grep typescript
├── typescript@4.8.2

Test runner environment

# Test command
export TEST_PACKAGES=benchmarking
export TEST_TYPE=unit
npx mocha

// .mocharc.cjs
// See also https://github.com/ericcornelissen/webmangler/blob/90274ddbcae32fe094a518502baa516b0e362424/.mocharc.cjs

module.exports = {
  recursive: true,
  reporter: "dot",
  timeout: 5000,
  ui: "tdd",
  spec: [
    "packages",
    "benchmarking",
    "**",
    "__tests__",
    "uni",
    `*.test.ts`,
  ].join("/"),
  require: [
    "ts-node/register",
    "tsconfig-paths/register",
  ],

  "watch-files": [
    ...["benchmarking"].map((packageName) => {
      return `packages/benchmarking/**/*.ts`;
    }),
  ],
  "watch-ignore": [
    `node_modules/`,
  ],
};

Your Environment

software	version(s)
node	16.17.0
npm	8.15.0
Operating System	Ubuntu 22.04.1 LTS

Add stryker.log

00:14:01 (60495) DEBUG ConfigReader Loading config from stryker.config.cjs
00:14:01 (60495) DEBUG ConfigReader Loaded config: {
  "coverageAnalysis": "perTest",
  "inPlace": false,
  "mutate": [
    "packages/benchmarking/src/**/*.ts",
    "!**/__tests__/**/*.ts"
  ],
  "commandRunner": {
    "command": "npm run test -- benchmarking --unit"
  },
  "timeoutMS": 25000,
  "timeoutFactor": 2.5,
  "disableTypeChecks": "packages/benchmarking/src/**/*.ts",
  "checkers": [
    "typescript"
  ],
  "tsconfigFile": "tsconfig.build.json",
  "reporters": [
    "clear-text",
    "dashboard",
    "html",
    "progress"
  ],
  "dashboard": {
    "module": "benchmarking",
    "baseUrl": "https://dashboard.stryker-mutator.io/api/reports",
    "reportType": "full"
  },
  "htmlReporter": {
    "fileName": "_reports/mutation/index.html"
  },
  "thresholds": {
    "high": 80,
    "low": 70,
    "break": 50
  },
  "tempDirName": ".temp/stryker",
  "cleanTempDir": false,
  "fileLogLevel": "trace",
  "logLevel": "debug",
  "configFile": "stryker.config.cjs",
  "allowConsoleColors": true,
  "checkerNodeArgs": [],
  "maxTestRunnerReuse": 0,
  "clearTextReporter": {
    "allowColor": true,
    "logTests": true,
    "maxTestsToLog": 3
  },
  "eventReporter": {
    "baseDir": "reports/mutation/events"
  },
  "ignorePatterns": [],
  "ignoreStatic": false,
  "maxConcurrentTestRunners": 9007199254740991,
  "mutator": {
    "plugins": null,
    "excludedMutations": []
  },
  "plugins": [
    "@stryker-mutator/*"
  ],
  "appendPlugins": [],
  "jsonReporter": {
    "fileName": "reports/mutation/mutation.json"
  },
  "symlinkNodeModules": true,
  "testRunner": "command",
  "testRunnerNodeArgs": [],
  "dryRunTimeoutMinutes": 5,
  "warnings": true,
  "disableBail": false
}
00:14:01 (60495) DEBUG PluginLoader Loading @stryker-mutator/* from .../node_modules/@stryker-mutator
00:14:01 (60495) DEBUG PluginLoader Loading plugin "@stryker-mutator/typescript-checker" (matched with expression @stryker-mutator/*)
00:14:01 (60495) DEBUG PluginLoader Loading plugin @stryker-mutator/typescript-checker
00:14:01 (60495) DEBUG PluginLoader Loading plugin file://.../node_modules/@stryker-mutator/core/dist/src/reporters/index.js
00:14:01 (60495) DEBUG MetaSchemaBuilder Contributing 0 schemas from plugins to options validation.
00:14:01 (60495) INFO ProjectReader Found 13 of 865 file(s) to be mutated.
00:14:01 (60495) DEBUG ProjectReader All input files: [
  ".../.editorconfig",
  ".../.eslintrc.cjs",
  ".../.gitattributes",
  ".../.github/ISSUE_TEMPLATE/bug.yml",
  ".../.github/ISSUE_TEMPLATE/feature.yml",
  ".../.github/ISSUE_TEMPLATE/question.yml",
  ".../.github/codecov.yml",
  ".../.github/codeql.yml",
  ".../.github/renovate.json",
  ".../.github/workflows/code-analysis.yml",
  ".../.github/workflows/code-checks.yml",
  ".../.github/workflows/config-checks.yml",
  ".../.github/workflows/lint.yml",
  ".../.gitignore",
  ".../.markdownlint.yml",
  ".../.mocharc.cjs",
  ".../.npmrc",
  ".../.nvmrc",
  ".../.values.cjs",
  ".../.vscode/settings.json",
  ".../LICENSE",
  ".../README.md",
  ".../commitlint.config.cjs",
  ".../nyc.config.cjs",
  ".../package-lock.json",
  ".../package.json",
  ".../packages/benchmarking/.gitignore",
  ".../packages/benchmarking/.npmignore",
  ".../packages/benchmarking/CHANGELOG.md",
  ".../packages/benchmarking/LICENSE",
  ".../packages/benchmarking/README.md",
  ".../packages/benchmarking/build/budget/compute.d.ts",
  ".../packages/benchmarking/build/budget/compute.js",
  ".../packages/benchmarking/build/budget/index.d.ts",
  ".../packages/benchmarking/build/budget/index.js",
  ".../packages/benchmarking/build/budget/system.d.ts",
  ".../packages/benchmarking/build/budget/system.js",
  ".../packages/benchmarking/build/index.d.ts",
  ".../packages/benchmarking/build/index.js",
  ".../packages/benchmarking/build/runner/config.d.ts",
  ".../packages/benchmarking/build/runner/config.js",
  ".../packages/benchmarking/build/runner/index.d.ts",
  ".../packages/benchmarking/build/runner/index.js",
  ".../packages/benchmarking/build/runner/run.d.ts",
  ".../packages/benchmarking/build/runner/run.js",
  ".../packages/benchmarking/build/runner/time.d.ts",
  ".../packages/benchmarking/build/runner/time.js",
  ".../packages/benchmarking/build/runner/types.d.ts",
  ".../packages/benchmarking/build/runner/types.js",
  ".../packages/benchmarking/build/stats/compute.d.ts",
  ".../packages/benchmarking/build/stats/compute.js",
  ".../packages/benchmarking/build/stats/index.d.ts",
  ".../packages/benchmarking/build/stats/index.js",
  ".../packages/benchmarking/build/stats/math.d.ts",
  ".../packages/benchmarking/build/stats/math.js",
  ".../packages/benchmarking/build/stats/types.d.ts",
  ".../packages/benchmarking/build/stats/types.js",
  ".../packages/benchmarking/package-lock.json",
  ".../packages/benchmarking/package.json",
  ".../packages/benchmarking/src/__tests__/integration/index.test.ts",
  ".../packages/benchmarking/src/__tests__/unit/index.test.ts",
  ".../packages/benchmarking/src/budget/__tests__/integration/compute.test.ts",
  ".../packages/benchmarking/src/budget/__tests__/unit/compute.test.ts",
  ".../packages/benchmarking/src/budget/__tests__/unit/system.test.ts",
  ".../packages/benchmarking/src/budget/compute.ts",
  ".../packages/benchmarking/src/budget/index.ts",
  ".../packages/benchmarking/src/budget/system.ts",
  ".../packages/benchmarking/src/index.ts",
  ".../packages/benchmarking/src/runner/__tests__/integration/run.test.ts",
  ".../packages/benchmarking/src/runner/__tests__/unit/config.test.ts",
  ".../packages/benchmarking/src/runner/__tests__/unit/run.test.ts",
  ".../packages/benchmarking/src/runner/__tests__/unit/time.test.ts",
  ".../packages/benchmarking/src/runner/config.ts",
  ".../packages/benchmarking/src/runner/index.ts",
  ".../packages/benchmarking/src/runner/run.ts",
  ".../packages/benchmarking/src/runner/time.ts",
  ".../packages/benchmarking/src/runner/types.ts",
  ".../packages/benchmarking/src/stats/__tests__/integration/compute.test.ts",
  ".../packages/benchmarking/src/stats/__tests__/unit/compute.test.ts",
  ".../packages/benchmarking/src/stats/__tests__/unit/math.test.ts",
  ".../packages/benchmarking/src/stats/compute.ts",
  ".../packages/benchmarking/src/stats/index.ts",
  ".../packages/benchmarking/src/stats/math.ts",
  ".../packages/benchmarking/src/stats/types.ts",
  ".../packages/benchmarking/tsconfig.json",
  ".../packages/cli/.gitignore",
  ".../packages/cli/.npmignore",
  ".../packages/cli/.webmanglerrc.js",
  ".../packages/cli/CHANGELOG.md",
  ".../packages/cli/LICENSE",
  ".../packages/cli/README.md",
  ".../packages/cli/lib/config/constants.js",
  ".../packages/cli/lib/config/default.js",
  ".../packages/cli/lib/config/index.js",
  ".../packages/cli/lib/config/loader.js",
  ".../packages/cli/lib/config/types.js",
  ".../packages/cli/lib/fs/file.class.js",
  ".../packages/cli/lib/fs/index.js",
  ".../packages/cli/lib/fs/list.js",
  ".../packages/cli/lib/fs/read.js",
  ".../packages/cli/lib/fs/types.js",
  ".../packages/cli/lib/fs/write.js",
  ".../packages/cli/lib/index.js",
  ".../packages/cli/lib/logger/default-logger.js",
  ".../packages/cli/lib/logger/index.js",
  ".../packages/cli/lib/logger/level.js",
  ".../packages/cli/lib/logger/types.js",
  ".../packages/cli/lib/main.js",
  ".../packages/cli/lib/reporters/default-reporter.js",
  ".../packages/cli/lib/reporters/index.js",
  ".../packages/cli/lib/reporters/json-reporter.js",
  ".../packages/cli/lib/reporters/types.js",
  ".../packages/cli/lib/stats/compute.js",
  ".../packages/cli/lib/stats/helpers.js",
  ".../packages/cli/lib/stats/index.js",
  ".../packages/cli/lib/stats/paths.js",
  ".../packages/cli/lib/stats/types.js",
  ".../packages/cli/lib/timing/index.js",
  ".../packages/cli/lib/timing/timing.js",
  ".../packages/cli/lib/types.js",
  ".../packages/cli/lib/version.js",
  ".../packages/cli/package.json",
  ".../packages/cli/src/__tests__/integration/version.test.ts",
  ".../packages/cli/src/__tests__/unit/version.test.ts",
  ".../packages/cli/src/config/__tests__/integration/loader.test.ts",
  ".../packages/cli/src/config/__tests__/unit/constants.test.ts",
  ".../packages/cli/src/config/__tests__/unit/default.test.ts",
  ".../packages/cli/src/config/__tests__/unit/loader.test.ts",
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  ".../packages/cli/src/config/index.ts",
  ".../packages/cli/src/config/loader.ts",
  ".../packages/cli/src/config/types.ts",
  ".../packages/cli/src/fs/__tests__/common/file.mock.ts",
  ".../packages/cli/src/fs/__tests__/common/file.test.ts",
  ".../packages/cli/src/fs/__tests__/integration/read.test.ts",
  ".../packages/cli/src/fs/__tests__/integration/write.test.ts",
  ".../packages/cli/src/fs/__tests__/unit/file.test.ts",
  ".../packages/cli/src/fs/__tests__/unit/list.test.ts",
  ".../packages/cli/src/fs/__tests__/unit/read.test.ts",
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  ".../packages/cli/src/fs/file.class.ts",
  ".../packages/cli/src/fs/index.ts",
  ".../packages/cli/src/fs/list.ts",
  ".../packages/cli/src/fs/read.ts",
  ".../packages/cli/src/fs/types.ts",
  ".../packages/cli/src/fs/write.ts",
  ".../packages/cli/src/index.ts",
  ".../packages/cli/src/logger/__tests__/integration/default-logger.test.ts",
  ".../packages/cli/src/logger/__tests__/unit/default-logger.test.ts",
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  ".../packages/cli/src/logger/level.ts",
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  ".../packages/cli/src/reporters/__tests__/common/index.ts",
  ".../packages/cli/src/reporters/__tests__/common/writer.mock.ts",
  ".../packages/cli/src/reporters/__tests__/common/writer.test.ts",
  ".../packages/cli/src/reporters/__tests__/unit/default-reporter.test.ts",
  ".../packages/cli/src/reporters/__tests__/unit/json-reporter.test.ts",
  ".../packages/cli/src/reporters/default-reporter.ts",
  ".../packages/cli/src/reporters/index.ts",
  ".../packages/cli/src/reporters/json-reporter.ts",
  ".../packages/cli/src/reporters/types.ts",
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  ".../packages/cli/src/stats/__tests__/common/file.test.ts",
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  ".../packages/cli/src/stats/compute.ts",
  ".../packages/cli/src/stats/helpers.ts",
  ".../packages/cli/src/stats/index.ts",
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  ".../packages/cli/src/timing/__tests__/unit/timing.test.ts",
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  ".../packages/core/lib/engine/find.js",
  ".../packages/core/lib/engine/helpers.d.ts",
  ".../packages/core/lib/engine/helpers.js",
  ".../packages/core/lib/engine/index.d.ts",
  ".../packages/core/lib/engine/index.js",
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  ".../packages/core/lib/engine/mangle.js",
  ".../packages/core/lib/engine/options.d.ts",
  ".../packages/core/lib/engine/options.js",
  ".../packages/core/lib/engine/replace.d.ts",
  ".../packages/core/lib/engine/replace.js",
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  ".../packages/core/lib/languages/builtin/index.js",
  ".../packages/core/lib/languages/builtin/types.d.ts",
  ".../packages/core/lib/languages/builtin/types.js",
  ".../packages/core/lib/languages/index.d.ts",
  ".../packages/core/lib/languages/index.js",
  ".../packages/core/lib/manglers/builtin/class.d.ts",
  ".../packages/core/lib/manglers/builtin/class.js",
  ".../packages/core/lib/manglers/builtin/index.d.ts",
  ".../packages/core/lib/manglers/builtin/index.js",
  ".../packages/core/lib/manglers/builtin/types.d.ts",
  ".../packages/core/lib/manglers/builtin/types.js",
  ".../packages/core/lib/manglers/index.d.ts",
  ".../packages/core/lib/manglers/index.js",
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  ".../packages/core/lib/manglers/recommended/class.js",
  ".../packages/core/lib/manglers/recommended/index.d.ts",
  ".../packages/core/lib/manglers/recommended/index.js",
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  ".../packages/core/src/embeds.ts",
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  ".../packages/core/src/engine/__tests__/common/characters.ts",
  ".../packages/core/src/engine/__tests__/common/index.ts",
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  ".../packages/core/src/engine/__tests__/unit/options.test.ts",
  ".../packages/core/src/engine/__tests__/unit/replace.test.ts",
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  ".../packages/core/src/manglers/recommended/class.ts",
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  ".../packages/core/src/manglers/recommended/types.ts",
  ".../packages/core/src/name-generator.class.ts",
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  ".../packages/mangler-html-attributes/build/types.d.ts",
  ".../packages/mangler-html-attributes/build/types.js",
  ".../packages/mangler-html-attributes/package.json",
  ".../packages/mangler-html-attributes/src/__tests__/integration/class.test.ts",
  ".../packages/mangler-html-attributes/src/__tests__/unit/class.test.ts",
  ".../packages/mangler-html-attributes/src/__tests__/unit/index.test.ts",
  ".../packages/mangler-html-attributes/src/class.ts",
  ".../packages/mangler-html-attributes/src/helpers/__tests__/integration/language-options.test.ts",
  ".../packages/mangler-html-attributes/src/helpers/__tests__/unit/characters.test.ts",
  ".../packages/mangler-html-attributes/src/helpers/__tests__/unit/language-options.test.ts",
  ".../packages/mangler-html-attributes/src/helpers/__tests__/unit/patterns.test.ts",
  ".../packages/mangler-html-attributes/src/helpers/__tests__/unit/prefix.test.ts",
  ".../packages/mangler-html-attributes/src/helpers/__tests__/unit/reserved.test.ts",
  ".../packages/mangler-html-attributes/src/helpers/characters.ts",
  ".../packages/mangler-html-attributes/src/helpers/index.ts",
  ".../packages/mangler-html-attributes/src/helpers/language-options.ts",
  ".../packages/mangler-html-attributes/src/helpers/patterns.ts",
  ".../packages/mangler-html-attributes/src/helpers/prefix.ts",
  ".../packages/mangler-html-attributes/src/helpers/reserved.ts",
  ".../packages/mangler-html-attributes/src/index.ts",
  ".../packages/mangler-html-attributes/src/types.ts",
  ".../packages/mangler-html-attributes/tsconfig.json",
  ".../packages/mangler-html-ids/.gitignore",
  ".../packages/mangler-html-ids/.npmignore",
  ".../packages/mangler-html-ids/CHANGELOG.md",
  ".../packages/mangler-html-ids/LICENSE",
  ".../packages/mangler-html-ids/README.md",
  ".../packages/mangler-html-ids/build/class.d.ts",
  ".../packages/mangler-html-ids/build/class.js",
  ".../packages/mangler-html-ids/build/helpers/characters.d.ts",
  ".../packages/mangler-html-ids/build/helpers/characters.js",
  ".../packages/mangler-html-ids/build/helpers/index.d.ts",
  ".../packages/mangler-html-ids/build/helpers/index.js",
  ".../packages/mangler-html-ids/build/helpers/language-options.d.ts",
  ".../packages/mangler-html-ids/build/helpers/language-options.js",
  ".../packages/mangler-html-ids/build/helpers/patterns.d.ts",
  ".../packages/mangler-html-ids/build/helpers/patterns.js",
  ".../packages/mangler-html-ids/build/helpers/prefix.d.ts",
  ".../packages/mangler-html-ids/build/helpers/prefix.js",
  ".../packages/mangler-html-ids/build/helpers/reserved.d.ts",
  ".../packages/mangler-html-ids/build/helpers/reserved.js",
  ".../packages/mangler-html-ids/build/index.d.ts",
  ".../packages/mangler-html-ids/build/index.js",
  ".../packages/mangler-html-ids/build/types.d.ts",
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  ".../packages/mangler-html-ids/src/__tests__/unit/index.test.ts",
  ".../packages/mangler-html-ids/src/class.ts",
  ".../packages/mangler-html-ids/src/helpers/__tests__/integration/language-options.test.ts",
  ".../packages/mangler-html-ids/src/helpers/__tests__/unit/characters.test.ts",
  ".../packages/mangler-html-ids/src/helpers/__tests__/unit/index.test.ts",
  ".../packages/mangler-html-ids/src/helpers/__tests__/unit/language-options.test.ts",
  ".../packages/mangler-html-ids/src/helpers/__tests__/unit/patterns.test.ts",
  ".../packages/mangler-html-ids/src/helpers/__tests__/unit/prefix.test.ts",
  ".../packages/mangler-html-ids/src/helpers/__tests__/unit/reserved.test.ts",
  ".../packages/mangler-html-ids/src/helpers/characters.ts",
  ".../packages/mangler-html-ids/src/helpers/index.ts",
  ".../packages/mangler-html-ids/src/helpers/language-options.ts",
  ".../packages/mangler-html-ids/src/helpers/patterns.ts",
  ".../packages/mangler-html-ids/src/helpers/prefix.ts",
  ".../packages/mangler-html-ids/src/helpers/reserved.ts",
  ".../packages/mangler-html-ids/src/index.ts",
  ".../packages/mangler-html-ids/src/types.ts",
  ".../packages/mangler-html-ids/tsconfig.json",
  ".../packages/mangler-utils/.gitignore",
  ".../packages/mangler-utils/.npmignore",
  ".../packages/mangler-utils/CHANGELOG.md",
  ".../packages/mangler-utils/LICENSE",
  ".../packages/mangler-utils/lib/characters.d.ts",
  ".../packages/mangler-utils/lib/characters.js",
  ".../packages/mangler-utils/lib/helpers.d.ts",
  ".../packages/mangler-utils/lib/helpers.js",
  ".../packages/mangler-utils/lib/index.d.ts",
  ".../packages/mangler-utils/lib/index.js",
  ".../packages/mangler-utils/lib/inputs.d.ts",
  ".../packages/mangler-utils/lib/inputs.js",
  ".../packages/mangler-utils/lib/multi-mangler.class.d.ts",
  ".../packages/mangler-utils/lib/multi-mangler.class.js",
  ".../packages/mangler-utils/lib/simple-mangler.class.d.ts",
  ".../packages/mangler-utils/lib/simple-mangler.class.js",
  ".../packages/mangler-utils/package.json",
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  ".../packages/mangler-utils/src/helpers.ts",
  ".../packages/mangler-utils/src/index.ts",
  ".../packages/mangler-utils/src/inputs.ts",
  ".../packages/mangler-utils/src/multi-mangler.class.ts",
  ".../packages/mangler-utils/src/simple-mangler.class.ts",
  ".../packages/mangler-utils/tsconfig.json",
  ".../packages/testing/.gitignore",
  ".../packages/testing/.npmignore",
  ".../packages/testing/CHANGELOG.md",
  ".../packages/testing/LICENSE",
  ".../packages/testing/README.md",
  ".../packages/testing/lib/helpers/generate.d.ts",
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  ".../packages/testing/lib/helpers/index.js",
  ".../packages/testing/lib/index.d.ts",
  ".../packages/testing/lib/index.js",
  ".../packages/testing/lib/mocks/index.d.ts",
  ".../packages/testing/lib/mocks/index.js",
  ".../packages/testing/lib/mocks/mangle-expression.d.ts",
  ".../packages/testing/lib/mocks/mangle-expression.js",
  ".../packages/testing/lib/mocks/types.d.ts",
  ".../packages/testing/lib/mocks/types.js",
  ".../packages/testing/lib/mocks/web-mangler-language-plugin.d.ts",
  ".../packages/testing/lib/mocks/web-mangler-language-plugin.js",
  ".../packages/testing/lib/mocks/web-mangler-plugin.d.ts",
  ".../packages/testing/lib/mocks/web-mangler-plugin.js",
  ".../packages/testing/lib/suites/index.d.ts",
  ".../packages/testing/lib/suites/index.js",
  ".../packages/testing/lib/suites/language-plugin/constructor.d.ts",
  ".../packages/testing/lib/suites/language-plugin/constructor.js",
  ".../packages/testing/lib/suites/language-plugin/index.d.ts",
  ".../packages/testing/lib/suites/language-plugin/index.js",
  ".../packages/testing/lib/suites/language-plugin/methods.d.ts",
  ".../packages/testing/lib/suites/language-plugin/methods.js",
  ".../packages/testing/lib/suites/language-plugin/types.d.ts",
  ".../packages/testing/lib/suites/language-plugin/types.js",
  ".../packages/testing/lib/suites/plugin/constructor.d.ts",
  ".../packages/testing/lib/suites/plugin/constructor.js",
  ".../packages/testing/lib/suites/plugin/index.d.ts",
  ".../packages/testing/lib/suites/plugin/index.js",
  ".../packages/testing/lib/suites/plugin/methods.d.ts",
  ".../packages/testing/lib/suites/plugin/methods.js",
  ".../packages/testing/lib/suites/plugin/types.d.ts",
  ".../packages/testing/lib/suites/plugin/types.js",
  ".../packages/testing/lib/suites/utils.d.ts",
  ".../packages/testing/lib/suites/utils.js",
  ".../packages/testing/lib/types.d.ts",
  ".../packages/testing/lib/types.js",
  ".../packages/testing/package.json",
  ".../packages/testing/src/__tests__/unit/index.test.ts",
  ".../packages/testing/src/helpers/__tests__/unit/generate.test.ts",
  ".../packages/testing/src/helpers/generate.ts",
  ".../packages/testing/src/helpers/index.ts",
  ".../packages/testing/src/index.ts",
  ".../packages/testing/src/mocks/__tests__/integration/mangle-expression.test.ts",
  ".../packages/testing/src/mocks/__tests__/integration/web-mangler-language-plugin.test.ts",
  ".../packages/testing/src/mocks/__tests__/integration/web-mangler-plugin.test.ts",
  ".../packages/testing/src/mocks/__tests__/unit/mangle-expression.test.ts",
  ".../packages/testing/src/mocks/__tests__/unit/web-mangler-language-plugin.test.ts",
  ".../packages/testing/src/mocks/__tests__/unit/web-mangler-plugin.test.ts",
  ".../packages/testing/src/mocks/index.ts",
  ".../packages/testing/src/mocks/mangle-expression.ts",
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  ".../packages/testing/src/suites/plugin/constructor.ts",
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  ".../packages/testing/tsconfig.json",
  ".../packages/types/.gitignore",
  ".../packages/types/.npmignore",
  ".../packages/types/CHANGELOG.md",
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  ".../packages/types/lib/characters.d.ts",
  ".../packages/types/lib/characters.js",
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  ".../packages/types/lib/index.js",
  ".../packages/types/lib/options.d.ts",
  ".../packages/types/lib/options.js",
  ".../packages/types/lib/types.d.ts",
  ".../packages/types/lib/types.js",
  ".../packages/types/lib/utils.d.ts",
  ".../packages/types/lib/utils.js",
  ".../packages/types/package.json",
  ".../packages/types/src/characters.ts",
  ".../packages/types/src/index.ts",
  ".../packages/types/src/options.ts",
  ".../packages/types/src/types.ts",
  ".../packages/types/src/utils.ts",
  ".../packages/types/tsconfig.json",
  ".../scripts/ci/get-filters.js",
  ".../scripts/clean.js",
  ".../scripts/hooks/_/.gitignore",
  ".../scripts/hooks/_/husky.sh",
  ".../scripts/hooks/commit-msg",
  ".../scripts/hooks/common.sh",
  ".../scripts/hooks/pre-commit",
  ".../scripts/hooks/pre-push",
  ".../scripts/lint.js",
  ".../scripts/test.js",
  ".../scripts/utilities/exec.js",
  ".../scripts/utilities/flags.js",
  ".../scripts/utilities/log.js",
  ".../scripts/utilities/paths.js",
  ".../scripts/utilities/vcs.js",
  ".../stryker.config.cjs",
  ".../testdata/.gitignore",
  ".../testdata/sample.css",
  ".../testdata/sample.html",
  ".../testdata/sample.js",
  ".../tsconfig.build.json",
  ".../tsconfig.json"
]
00:14:01 (60495) DEBUG ProjectReader Files to mutate: [
  ".../packages/benchmarking/src/budget/compute.ts",
  ".../packages/benchmarking/src/budget/index.ts",
  ".../packages/benchmarking/src/budget/system.ts",
  ".../packages/benchmarking/src/index.ts",
  ".../packages/benchmarking/src/runner/config.ts",
  ".../packages/benchmarking/src/runner/index.ts",
  ".../packages/benchmarking/src/runner/run.ts",
  ".../packages/benchmarking/src/runner/time.ts",
  ".../packages/benchmarking/src/runner/types.ts",
  ".../packages/benchmarking/src/stats/compute.ts",
  ".../packages/benchmarking/src/stats/index.ts",
  ".../packages/benchmarking/src/stats/math.ts",
  ".../packages/benchmarking/src/stats/types.ts"
]
00:14:01 (60495) DEBUG TemporaryDirectory Using temp directory ".../.temp/stryker"
00:14:01 (60495) DEBUG Instrumenter Instrumenting 13 source files with mutants
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/budget/compute.ts (4 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/budget/index.ts (1 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/budget/system.ts (5 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/index.ts (1 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/runner/config.ts (9 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/runner/index.ts (2 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/runner/run.ts (12 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/runner/time.ts (2 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/runner/types.ts (0 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/stats/compute.ts (4 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/stats/index.ts (0 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/stats/math.ts (13 mutant(s))
00:14:01 (60495) DEBUG Instrumenter Instrumented packages/benchmarking/src/stats/types.ts (0 mutant(s))
00:14:01 (60495) INFO Instrumenter Instrumented 13 source file(s) with 53 mutant(s)
00:14:01 (60495) DEBUG TSConfigPreprocessor Rewriting file ProjectFile {
  fs: [FileSystem],
  name: '.../tsconfig.build.json',
  mutate: false
}
00:14:01 (60495) DEBUG TSConfigPreprocessor Rewriting file ProjectFile {
  fs: [FileSystem],
  name: '.../tsconfig.json',
  mutate: false
}
00:14:01 (60495) INFO ConcurrencyTokenProvider Creating 8 checker process(es) and 7 test runner process(es).
00:14:01 (60495) DEBUG ChildProcessProxy Started CheckerWorker in child process 60514
00:14:01 (60495) DEBUG ChildProcessProxy Started CheckerWorker in child process 60520
00:14:02 (60520) DEBUG PluginLoader Loading plugin @stryker-mutator/typescript-checker
00:14:02 (60520) DEBUG PluginLoader Loading plugin file://.../node_modules/@stryker-mutator/core/dist/src/reporters/index.js
00:14:02 (60514) DEBUG PluginLoader Loading plugin @stryker-mutator/typescript-checker
00:14:02 (60514) DEBUG PluginLoader Loading plugin file://.../node_modules/@stryker-mutator/core/dist/src/reporters/index.js
00:14:02 (60495) DEBUG Stryker Not removing the temp dir because an error occurred
00:14:02 (60495) ERROR Stryker Unexpected error occurred while running Stryker StrykerError: Error: An error occurred during initialization of the "typescript" checker. Inner error: TypeError: Cannot read properties of undefined (reading 'modifiedTime')
TypeError: Cannot read properties of undefined (reading 'modifiedTime')
    at Object.getModifiedTime (file://.../node_modules/@stryker-mutator/typescript-checker/dist/src/typescript-checker.js:84:49)
    at Object.host.getModifiedTime (.../node_modules/typescript/lib/typescript.js:126004:89)
    at Object.getModifiedTime (.../node_modules/typescript/lib/typescript.js:6278:21)
    at getUpToDateStatusWorker (.../node_modules/typescript/lib/typescript.js:127092:37)
    at getUpToDateStatus (.../node_modules/typescript/lib/typescript.js:127220:22)
    at getNextInvalidatedProjectCreateInfo (.../node_modules/typescript/lib/typescript.js:126731:26)
    at getNextInvalidatedProject (.../node_modules/typescript/lib/typescript.js:126794:20)
    at build (.../node_modules/typescript/lib/typescript.js:127365:38)
    at Object.build (.../node_modules/typescript/lib/typescript.js:127573:101)
    at TypescriptChecker.init (file://.../node_modules/@stryker-mutator/typescript-checker/dist/src/typescript-checker.js:97:18)
Error: An error occurred during initialization of the "typescript" checker. Inner error: TypeError: Cannot read properties of undefined (reading 'modifiedTime')
TypeError: Cannot read properties of undefined (reading 'modifiedTime')
    at Object.getModifiedTime (file://.../node_modules/@stryker-mutator/typescript-checker/dist/src/typescript-checker.js:84:49)
    at Object.host.getModifiedTime (.../node_modules/typescript/lib/typescript.js:126004:89)
    at Object.getModifiedTime (.../node_modules/typescript/lib/typescript.js:6278:21)
    at getUpToDateStatusWorker (.../node_modules/typescript/lib/typescript.js:127092:37)
    at getUpToDateStatus (.../node_modules/typescript/lib/typescript.js:127220:22)
    at getNextInvalidatedProjectCreateInfo (.../node_modules/typescript/lib/typescript.js:126731:26)
    at getNextInvalidatedProject (.../node_modules/typescript/lib/typescript.js:126794:20)
    at build (.../node_modules/typescript/lib/typescript.js:127365:38)
    at Object.build (.../node_modules/typescript/lib/typescript.js:127573:101)
    at TypescriptChecker.init (file://.../node_modules/@stryker-mutator/typescript-checker/dist/src/typescript-checker.js:97:18)
    at CheckerWorker.init (file://.../node_modules/@stryker-mutator/core/dist/src/checker/checker-worker.js:14:23)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async ChildProcessProxyWorker.handleCall (file://.../node_modules/@stryker-mutator/core/dist/src/child-proxy/child-process-proxy-worker.js:82:28)
    at ChildProcess.<anonymous> (file://.../node_modules/@stryker-mutator/core/dist/src/child-proxy/child-process-proxy.js:144:68)
    at ChildProcess.emit (node:events:513:28)
    at emit (node:internal/child_process:939:14)
    at processTicksAndRejections (node:internal/process/task_queues:84:21) {
  innerError: undefined
}
00:14:02 (60495) INFO Stryker This might be a known problem with a solution documented in our troubleshooting guide.
00:14:02 (60495) INFO Stryker You can find it at https://stryker-mutator.io/docs/stryker-js/troubleshooting/
00:14:02 (60495) DEBUG ChildProcessProxy Disposing of worker process 60514
00:14:02 (60495) DEBUG ChildProcessProxy Disposing of worker process 60520
00:14:02 (60495) DEBUG ChildProcessProxy Kill 60514
00:14:02 (60495) DEBUG ChildProcessProxy Kill 60520

[ericcornelissen]

I did a little bit more digging after also observing this issue in one of my other projects, here's what I found.

For some reason, the line

https://github.com/stryker-mutator/stryker-js/blob/a38cea59098147a88d6d51b77a4747020fb6ff7d/packages/typescript-checker/src/typescript-checker.ts#L95

is sometimes receiving file paths for .js files in the TypeScript source directory that should instead be in the TypeScript output directory, for example:

// actual
fileName=".../packages/benchmarking/src/index.js"
// expected(?)
fileName=".../packages/benchmarking/build/index.js"

it makes sense that this results in this.fs.getFile(fileName) evaluating to undefined and hence the lookup for modifiedTime failing.

As far as I'm able to tell this simply doesn't happen with TypeScript v4.7.4...

[nicojs]

Thanks for the clear issue. Apparently, TS 4.8 calls getModifiedTime before validating the file actually exists. This is a quick fix, as it allows undefined as the return value.