fetch-mock-cache/lib/headers.js

Caching mock fetch implementation for all runtimes and frameworks.

/**
 * @module
 * Headers need special handling for "set-cookie" headers.
 * Node v19.7.0+ has a `getSetCookie` method on the Headers class.
 * node-fetch v3.0.0+ has a `raw` method on the Headers class.
 * In browser environments its irrelevant.
 */
/**
 * Given a Headers object, return a plain object with the headers.
 * The "set-cookie" header is handled differently in different environments.
 */
export function serializeHeaders(headers) {
    const serialized = Object.fromEntries(headers.entries());
    if (serialized["set-cookie"]) {
        if (typeof headers.getSetCookie === "function") {
            // @ts-expect-error: no type guard for typeof === "function"
            serialized["set-cookie"] = headers.getSetCookie();
            // @ts-expect-error: node-fetch package
        }
        else if (typeof headers.raw === "function") {
            // @ts-expect-error: no type guard for typeof === "function"
            serialized["set-cookie"] = headers.raw()["set-cookie"];
        }
    }
    return serialized;
}
/**
 * Given a Record<string, string | string[]>, return a Headers object.
 */
export function deserializeHeaders(serialized) {
    const headers = new Headers();
    for (const [key, value] of Object.entries(serialized)) {
        if (Array.isArray(value)) {
            for (const v of value)
                headers.append(key, v);
        }
        else
            headers.set(key, value);
    }
    return headers;
}