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error TS2451: Cannot redeclare block-scoped variable 'cucumber_1'

Stack Overflow Asked by mismas on December 30, 2021

I’m getting this error: error TS2451: Cannot redeclare block-scoped variable 'cucumber_1'.

I use webdriverIO 5, cucumber and typescript. This didn’t happen before.

This is my package.json

{
 "name": "webdriverio_v5_typescript",
 "version": "1.0.0",
 "description": "Boilerplate project using version 5 WebdriverIO & TypeScript.",
 "repository": "https://github.com/jpolley/WebdriverIO_v5_TypeScript",
 "scripts": {
 "test:acc": "cross-env TEST_ENV='acc' wdio src/config/env/acc/acc.conf.js",
 "test:dev": "cross-env TEST_ENV='dev' wdio src/config/env/dev/dev.conf.js",
 "lint": "tslint --fix 'test/**/*.ts' && tslint --fix 'src/**/*.ts'",
 "report": "allure generate ./allure-results --clean && allure open",
 "report-ci": "allure generate allure-results --clean -o allure-report"
},
"author": "Jeremy Polley",
"license": "ISC",
"devDependencies": {
"@applitools/eyes-webdriverio": "^5.8.4",
"@types/chai": "^4.2.2",
"@types/cucumber": "^4.0.5",
"@types/node": "^10.14.18",
"@wdio/allure-reporter": "^5.12.1",
"@wdio/applitools-service": "^5.8.0",
"@wdio/cli": "^5.13.0",
"@wdio/cucumber-framework": "^5.16.12",
"@wdio/local-runner": "^5.16.11",
"@wdio/selenium-standalone-service": "^5.16.10",
"@wdio/spec-reporter": "^5.12.1",
"@wdio/sync": "^5.16.11",
"allure-commandline": "^2.13.0",
"chai": "^4.2.0",
"chromedriver": "^78.0.1",
"cross-env": "^7.0.2",
"ts-node": "^8.10.2",
"tsconfig-paths": "^3.9.0",
"tslint": "^5.20.0",
"typescript": "^3.9.7",
"wdio-chromedriver-service": "^5.0.2",
"webdriverio": "^5.16.11"
  }
 }

This is tsconfig.json file:

{
"compilerOptions": {
"lib": ["es2016"],
"skipLibCheck": true,
"baseUrl": ".",
"paths": {
  "*": [
    "./*"
  ],
  "src/*": [
    "./src/*"
  ],
  "test/*": [
    "src/step_definitions/*"
  ]
},
/* Basic Options */
"target": "es2016",                       /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
"module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
// "lib": [],                             /* Specify library files to be included in the compilation. */
// "allowJs": true,                       /* Allow javascript files to be compiled. */
// "checkJs": true,                       /* Report errors in .js files. */
// "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
// "declaration": true,                   /* Generates corresponding '.d.ts' file. */
// "sourceMap": true,                     /* Generates corresponding '.map' file. */
// "outFile": "./",                       /* Concatenate and emit output to single file. */
// "outDir": "./",                        /* Redirect output structure to the directory. */
// "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
// "removeComments": true,                /* Do not emit comments to output. */
// "noEmit": true,                        /* Do not emit outputs. */
// "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
// "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
// "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */

/* Strict Type-Checking Options */
"strict": true,                           /* Enable all strict type-checking options. */
"noImplicitAny": false,                   /* Raise error on expressions and declarations with an implied 'any' type. */
// "strictNullChecks": true,              /* Enable strict null checks. */
// "strictFunctionTypes": true,           /* Enable strict checking of function types. */
// "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
// "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
// "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */

/* Additional Checks */
// "noUnusedLocals": true,                /* Report errors on unused locals. */
// "noUnusedParameters": true,            /* Report errors on unused parameters. */
// "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
// "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */

/* Module Resolution Options */
// "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
// "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
// "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
// "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
// "typeRoots": [],                       /* List of folders to include type definitions from. */
"types": ["@wdio/sync","cucumber", "node", "@wdio/applitools-service"], /* Type declaration files to be included in compilation. */
"typeRoots": ["./types"],
"allowSyntheticDefaultImports": true,     /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
"esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
// "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */

/* Source Map Options */
// "sourceRoot": "./",                    /* Specify the location where debugger should locate TypeScript files instead of source locations. */
// "mapRoot": "./",                       /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
// "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */

/* Experimental Options */
// "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
// "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
 }
}  

I couldn’t find anything that would help me solve the problem.
I think it could be related to typescript version or some kind of dependency issue.
Please help 🙂

One Answer

Add export {} at the top/outermost scope. The error is likely due to conflicts in the global declaration.

You can also refer to this thread

Answered by K.P on December 30, 2021

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