fix: eslint warnings

src/header/interpreter.ts

@@ -5,7 +5,7 @@ import type { HeadersInterpreter } from './types';
 export const defaultHeaderInterpreter: HeadersInterpreter = (headers) => {
   if (!headers) return 'not enough headers';
 
-  const cacheControl = headers[Header.CacheControl];
+  const cacheControl: unknown = headers[Header.CacheControl];
 
   if (cacheControl) {
     const { noCache, noStore, mustRevalidate, maxAge, immutable } = parse(
@@ -29,7 +29,7 @@ export const defaultHeaderInterpreter: HeadersInterpreter = (headers) => {
     }
 
     if (maxAge !== undefined) {
-      const age = headers[Header.Age];
+      const age: unknown = headers[Header.Age];
 
       if (!age) {
         return maxAge * 1000;
@@ -39,7 +39,7 @@ export const defaultHeaderInterpreter: HeadersInterpreter = (headers) => {
     }
   }
 
-  const expires = headers[Header.Expires];
+  const expires: unknown = headers[Header.Expires];
 
   if (expires) {
     const milliseconds = Date.parse(String(expires)) - Date.now();

src/interceptors/util.ts

@@ -42,15 +42,19 @@ export function updateStaleRequest<D>(
   const { etag, modifiedSince } = config.cache;
 
   if (etag) {
-    const etagValue = etag === true ? cache.data?.headers[Header.ETag] : etag;
+    const etagValue =
-    etagValue && (config.headers[Header.IfNoneMatch] = etagValue);
+      etag === true ? (cache.data?.headers[Header.ETag] as unknown) : etag;
+
+    if (etagValue) {
+      config.headers[Header.IfNoneMatch] = etagValue;
+    }
   }
 
   if (modifiedSince) {
     config.headers[Header.IfModifiedSince] =
       modifiedSince === true
         ? // If last-modified is not present, use the createdAt timestamp
-          cache.data.headers[Header.LastModified] ||
+          (cache.data.headers[Header.LastModified] as unknown) ||
           new Date(cache.createdAt).toUTCString()
         : modifiedSince.toUTCString();
   }

src/util/cache-predicate.ts

@@ -1,5 +1,6 @@
 import type { CacheAxiosResponse } from '../cache/axios';
-import type { CachePredicate } from './types';
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+import type { CachePredicate, CachePredicateObject } from './types';
 
 /** Tests an response against a {@link CachePredicateObject}. */
 export async function testCachePredicate<R = unknown, D = unknown>(
@@ -24,6 +25,9 @@ export async function testCachePredicate<R = unknown, D = unknown>(
       if (
         !(await predicate(
           // Axios response headers are in lowercase, but check both just in case.
+
+          // FIXME: https://github.com/axios/axios/pull/5525
+          // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
           response.headers[header.toLowerCase()] ?? response.headers[header]
         ))
       ) {

src/util/types.ts

@@ -22,7 +22,10 @@ export type CachePredicateObject<R = unknown, D = unknown> = {
    *
    * ### Remember, all axios headers are lowercase.
    */
-  containsHeaders?: Record<string, (header?: string) => MaybePromise<boolean>>;
+  containsHeaders?: Record<
+    string,
+    (header?: CacheAxiosResponse['headers'][string]) => MaybePromise<boolean>
+  >;
 
   /** Check if the response matches this predicate. */
   responseMatch?: (res: CacheAxiosResponse<R, D>) => MaybePromise<boolean>;

test/interceptors/last-modified.test.ts

@@ -104,7 +104,7 @@ describe('Last-Modified handling', () => {
 
     // First request, return x-my-header. Ttl 1 to make the cache stale
     const firstResponse = await axios.get('http://test.com', { cache: { ttl: -1 } });
-    const firstMyHeader = firstResponse.headers?.[XMockRandom];
+    const firstMyHeader: unknown = firstResponse.headers?.[XMockRandom];
 
     expect(firstMyHeader).toBeDefined();
     expect(Number(firstMyHeader)).not.toBeNaN();
@@ -113,7 +113,7 @@ describe('Last-Modified handling', () => {
     const secondResponse = await axios.get('http://test.com', {
       cache: { modifiedSince: true }
     });
-    const secondMyHeader = secondResponse.headers?.[XMockRandom];
+    const secondMyHeader: unknown = secondResponse.headers?.[XMockRandom];
 
     expect(secondMyHeader).toBeDefined();
     expect(Number(secondMyHeader)).not.toBeNaN();

test/mocks/axios.ts

@@ -16,7 +16,7 @@ export function mockAxios(
   axios.defaults.adapter = async (config) => {
     await 0; // Jumps to next tick of nodejs event loop
 
-    const should304 =
+    const should304: unknown =
       config.headers?.[Header.IfNoneMatch] || config.headers?.[Header.IfModifiedSince];
     const status = should304 ? 304 : 200;
 

test/util/cache-predicate.test.ts

@@ -1,3 +1,5 @@
+/* eslint-disable @typescript-eslint/no-unsafe-member-access */
+/* eslint-disable @typescript-eslint/no-unsafe-return */
 import type { CachedStorageValue } from '../../src/storage/types';
 import { testCachePredicate } from '../../src/util/cache-predicate';
 import { mockAxios } from '../mocks/axios';