[Array.prototype.reduce] TS infers accumulator type as any[]

TypeScript Version: 3.7-Beta, "noImplicitAny" compiler mode

Search Terms:
Array.prototype.reduce, reduce type inference, reduce implicit any

Code

const result = [1].reduce((acc, item) => {
    acc.push(item)
    return acc
}, [])

result[0].toLowerCase()

Expected behavior:

1. result implicitly has type any[] -> compiler error ("noImplicitAny")
   or
2. result has type unknown[] -> compiler error

Actual behavior:
result has type any[], no errors

Playground Link: http://www.typescriptlang.org/play/?strictNullChecks=false&strictPropertyInitialization=false&ts=3.7-Beta&ssl=6&ssc=24&pln=1&pc=1#code/MYewdgzgLgBATgUwgVwDawLwwNoEYC6AdIgCbLAIAUlAhsMADQwCWUCAtgJQwYB8MAbwBQMUTDrBCAB2QQAFpVYdOIsYijI4YcfSEBfJtnwqhiFOmwAGIlBAAZEAHcEcAMI0IVTkA

Related Issues: https://github.com/microsoft/TypeScript/issues/25454, https://github.com/microsoft/TypeScript/issues/29604

P.S. It seems reasonable to align behavior with other empty array cases, e.g.:

let x = {
    array: [] // Object literal's property 'array' implicitly has an 'any[]' type
}

let x = []
x[0].toLowerCase() // Variable 'x' implicitly has type 'any[]' in some locations where its type cannot be determined

Commencez par la reproduction liée dans TypeScript Playground avec noImplicitAny et comparez-la aux issues associées 25454 et 29604. Le travail est terminé lorsque l’accumulateur de tableau vide est diagnostiqué ou signalé de manière cohérente avec les autres cas de tableaux vides, en produisant l’erreur de compilation attendue.