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When I build my application I get. error TS2339: Property 'split' does not exist on type 'string | string[]'. Property 'split' does not exist on type 'string[]'.
How can a split not exist on a string or string[]. It seems weird it sees it as a string array because it throws the error on a req.headers.authorization.split(" ")[1]. So this is basically: "Bearer (the token) so this seems to me a string that is getting split.
I'm using typescript version 2.3.
I tried changing the target in tsconfig to es2017.
I tried changing the lib to es6 and es7
All didn't work.
What rookie mistake did I make
This is my tsconfig.json
{ "compilerOptions": { "module": "commonjs", "target": "es6", "noImplicitAny": true, "moduleResolution": "node", "sourceMap": true, "outDir": "dist", "baseUrl": ".", "lib": [ "es2015", "es2017", "dom" ], "paths": { "*": [ "node_modules/*", "src/types/*" ] } }, "include": [ "src/**/*" ], "exclude": [ "test/**/*" ] } This is my package.json
{ "name": "express-typescript-starter", "version": "0.1.0", "description": "A starting point for Node.js express apps with TypeScript", "repository": { "type": "git", "url": "https://github.com/sahat/hackathon-starter.git" }, "author": "", "license": "MIT", "scripts": { "start": "npm run build && npm run watch", "build": "npm run build-ts && npm run tslint", "serve": "node $NODE_DEBUG_OPTION dist/server.js", "watch": "concurrently -k -p \"[{name}]\" -n \"TypeScript,Node\" -c \"cyan.bold,green.bold\" \"npm run watch-ts\" \"nodemon $NODE_DEBUG_OPTION dist/server.js\"", "test": "cross-env TEST_REPORT_PATH=./test-reports/ NODE_ENV=test MONGODB_URI=mongodb://localhost:27017/portal-service-test jest --verbose --forceExit", "build-ts": "tsc", "watch-ts": "tsc -w", "tslint": "tslint -c tslint.json -p tsconfig.json", "what": "tsc --version", "swagger": "swagger-ts-generate --entryFile=./src/server.ts --swaggerDir=./dist --routesDir=./src", "clean": "rimraf ./dist" }, "jest": { "testResultsProcessor": "./node_modules/jest-junit-reporter", "globals": { "__TS_CONFIG__": "tsconfig.json" }, "moduleFileExtensions": [ "ts", "js" ], "transform": { "^.+\\.(ts|tsx)$": "./node_modules/ts-jest/preprocessor.js" }, "testMatch": [ "**/test/**/*.test.(ts|js)" ], "testEnvironment": "node" }, "dependencies": { "@types/express-jwt": "^0.0.37", "async": "^2.1.2", "axios": "^0.16.2", "bcrypt-nodejs": "^0.0.3", "body-parser": "^1.15.2", "compression": "^1.6.2", "connect-mongo": "1.3.2", "cors": "^2.8.4", "crypto": "^1.0.1", "dotenv": "^2.0.0", "errorhandler": "^1.4.3", "express": "^4.14.0", "express-jwt": "^5.3.0", "express-session": "^1.14.2", "express-validator": "^3.2.1", "formidable": "^1.1.1", "jsonwebtoken": "^7.4.1", "jwt-decode": "^2.2.0", "lodash": "^4.17.4", "mock-require": "^2.0.2", "mongoose": "^4.11.5", "morgan": "^1.7.0", "passport": "0.3.2", "passport-http-jwt-bearer": "^0.1.3", "q": "^1.5.0", "qs": "^6.5.1", "request": "^2.81.0", "swagger-jsdoc": "^1.9.6", "swagger-ui-express": "^1.X", "uuid": "^3.1.0", "winston": "^2.3.1", "winston-daily-rotate-file": "^1.4.6", "yn": "^2.0.0" }, "devDependencies": { "@types/async": "^2.0.40", "@types/body-parser": "^1.16.2", "@types/chai": "^4.0.4", "@types/connect-mongo": "^0.0.32", "@types/cors": "^2.8.1", "@types/dotenv": "^2.0.20", "@types/errorhandler": "^0.0.30", "@types/express": "^4.0.35", "@types/express-validator": "^3.0.0", "@types/jest": "^19.2.2", "@types/lodash": "^4.14.63", "@types/mongodb": "^2.1.43", "@types/mongoose": "^4.7.9", "@types/morgan": "^1.7.32", "@types/node": "^7.0.12", "@types/node-notifier": "^0.0.28", "@types/nodemailer": "^1.3.32", "@types/passport": "^0.3.3", "@types/request": "0.0.42", "@types/sinon": "^2.3.3", "@types/sinon-chai": "^2.7.29", "@types/sinon-express-mock": "^1.3.2", "@types/supertest": "^2.0.2", "@types/swagger-jsdoc": "^0.0.1", "@types/uuid": "^3.4.0", "@types/winston": "^2.3.3", "babel-preset-es2015": "^6.24.1", "chai": "^4.1.2", "concurrently": "^3.4.0", "cross-env": "^5.0.5", "jest": "^19.0.2", "jest-junit-reporter": "^1.1.0", "mockgoose": "^7.3.3", "node-notifier": "^5.1.2", "nodemon": "^1.11.0", "rimraf": "^2.6.1", "sinon": "^3.2.1", "sinon-chai": "^2.13.0", "sinon-express-mock": "^1.3.1", "supertest": "^3.0.0", "ts-jest": "^19.0.8", "tslint": "^5.0.0", "typescript": "2.3.X" } } 
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The "Property does not exist on type '{}'" error occurs when we try to access or set a property that is not contained in the object's type. To solve the error, type the object properties explicitly or use a type with variable key names.
The "Property does not exist on type String" error occurs when we try to access a property that does not exist on the string type. To solve the error, use an object instead of a string, or make sure you're accessing a valid built-in method on the string. Here is an example of how the error occurs.
To fix the error "TS2339: Property 'x' does not exist on type 'Y'" with TypeScript, we should make sure the properties are listed in the interface that's set as the type of the object. interface Images { main: string; [key: string]: string; } const getMainImageUrl = (images: Images): string => { return images. main; };
The "Property does not exist on type void" error occurs when we try to access a property on the return value of a function that doesn't return anything. To solve the error, make sure to return the correct value from all of the function's code paths.
The type you are trying to invoke split on is string|string[], which means that value may be either a string or a string[], in order for TypeScript to be happy, BOTH types must have a split method. If you are confident that it will always be a string, either update the definition (if possible) or cast to a string before calling split:
(<string>req.headers.authorization).split or
(req.headers.authorization as string).split If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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