[@types/express] 4 argument function is not inferred as ErrorRequestHandler in Express.use

[wirekang]

import {ErrorRequestHandler} from "express";
import express from "express"

const errorHandler: ErrorRequestHandler = (err,req,res,next)=>{}

const app = express()

app.use(errorHandler) // Works well with typescript
app.use((err,req,res,next)=>{}) //     <-------  Wrong type here

All arguments(err~next) is any type. Is it intended?

[typescript-bot]

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Pinging the DT module owners: @borisyankov, @CMUH, @puneetar, @dfrankland.

[alex-kinokon]

The problem is that the signature using RequestHandler has a higher precedence over the one using RequestHandlerParams. If you swap that two lines it’s going the work. The problem was introduced by #10025.

Edit: Pull request