Bug: Typescript definition file index.d.ts is missing insecureHTTPParser

[dianejewett]

Reproduction

fetch("./user-details", {
method: "POST",
headers: headers,
body: JSON.stringify({ userId: userId }),
insecureHTTPParser: true,
})

Gives typescript error: Object literal may only specify known properties, and 'insecureHTTPParser' does not exist in type 'RequestInit'.

software	version
node-fetch	3.0.0-beta.9
node	14.4.0
npm	6.14.5
Operating System	Linux MInt