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set.ts
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set.ts
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import { objectToHeaders } from 'headers-polyfill'
import { ResponseTransformer } from '../response'
export type HeadersObject<KeyType extends string = string> = Record<
KeyType,
string | string[]
>
/**
* @see https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_header_name
*/
export type ForbiddenHeaderNames =
| 'cookie'
| 'cookie2'
| 'set-cookie'
| 'set-cookie2'
export type ForbiddenHeaderError<HeaderName extends string> =
`SafeResponseHeader: the '${HeaderName}' header cannot be set on the response. Please use the 'ctx.cookie()' function instead.`
/**
* Sets one or multiple response headers.
* @example
* ctx.set('Content-Type', 'text/plain')
* ctx.set({
* 'Accept': 'application/javascript',
* 'Content-Type': "text/plain"
* })
* @see {@link https://mswjs.io/docs/api/context/set `ctx.set()`}
*/
export function set<N extends string | HeadersObject>(
...args: N extends string
? Lowercase<N> extends ForbiddenHeaderNames
? [ForbiddenHeaderError<N>]
: [N, string]
: N extends HeadersObject<infer CookieName>
? Lowercase<CookieName> extends ForbiddenHeaderNames
? [ForbiddenHeaderError<CookieName>]
: [N]
: [N]
): ResponseTransformer {
return (res) => {
const [name, value] = args
if (typeof name === 'string') {
res.headers.append(name, value as string)
} else {
const headers = objectToHeaders(name)
headers.forEach((value, name) => {
res.headers.append(name, value)
})
}
return res
}
}