SolvedDefinitelyTyped Error: Interface 'Response<ResBody>' incorrectly extends interface 'Response'

When I compile from typescript I get this bug

node_modules/@types/express-serve-static-core/index.d.ts:505:18 - error TS2430: Interface 'Response<ResBody>' incorrectly extends interface 'Response'.
  Types of property 'locals' are incompatible.
    Type 'Record<string, any>' is missing the following properties from type 'i18nAPI': locale, __, __n, __mf, and 5 more.

505 export interface Response<ResBody = any> extends http.ServerResponse, Express.Response {
                     ~~~~~~~~

from my package.json

    "dependencies": {
        "@types/i18n": "^0.8.6",
        "@types/jest": "^26.0.7",
        "@types/moment": "^2.13.0",
        "@types/node": "^14.0.26",
        "@types/node-schedule": "^1.3.0",
        "@types/ws": "^7.2.6",
        "@typescript-eslint/eslint-plugin": "^3.7.0",
        "@typescript-eslint/parser": "^3.7.0",
        "@types/express": "^4.17.7",
        "chokidar": "^3.4.1",
        "dblapi.js": "^2.4.0",
        "discord.js": "^12.2.0",
        "eslint": "^7.5.0",
        "eslint-plugin-jest": "^23.18.2",
        "express": "^4.17.1",
        "findit2": "^2.2.3",
        "i18n": "^0.10.0",
        "jest": "^26.1.0",
        "moment": "^2.27.0",
        "node-schedule": "^1.3.2",
        "npm-check-updates": "^7.0.3",
        "tree-kill": "^1.2.2",
        "ts-jest": "^26.1.4",
        "typescript": "^3.9.7"
    }

Anyone know what's wrong?

44 Answers

✔️Accepted Answer

I added "skipLibCheck": true in tsconfig.json, so it worked for me.

Other Answers:

I got it working after adding

    "@types/express-serve-static-core": "^4.17.21",

before package-lock.json showed v4.17.19 - apparently .21 includes a fix.

rm -rf node_module;
rm yarn.lock;
yarn install;

And it worked correctly.

I am pretty sure this is related to a recent update to @types/express-serve-static-core that changed the declaration of Response.locals from any to Record<string, any> .... this basically defines it as an object with potentially infinite properties and prevents constraining it to a more specific type. I think it should be reverted back to an any or add support for specifying the type of locals via a generic parameter.

just bumping this up, recently upgraded to typescript 4 and now I'm getting this error. skipLibCheck seems like an ugly work around. I do indeed think the changes in @types/express-serve-static-core are the problem as described by @drtyh2o

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