diff --git a/package.json b/package.json
index 4862304..7a66134 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
   },
   "scripts": {
     "build": "tsc -p tsconfig.prod.json",
-    "check": "yarn compile && yarn lint && yarn test",
+    "check": "yarn compile && yarn lint && yarn test --forbid-only",
     "compile": "tsc",
     "lint": "tslint -p tsconfig.json -c tslint.json \"**/*.ts\"",
     "release": "semantic-release",
@@ -46,6 +46,7 @@
     "semantic-release": "^19.0.5",
     "sinon": "^14.0.2",
     "ts-node": "^10.9.1",
+    "tslib": "^2.4.1",
     "tslint": "^6.1.3",
     "tslint-eslint-rules": "^5.4.0",
     "typescript": "^4.8.4"
diff --git a/src/lib/RxjsAxios.ts b/src/lib/RxjsAxios.ts
index bd9d553..1316590 100644
--- a/src/lib/RxjsAxios.ts
+++ b/src/lib/RxjsAxios.ts
@@ -73,10 +73,11 @@ export class RxjsAxios {
   public request<T, R extends AxiosResponse<T> = AxiosResponse<T>, D = unknown>(
     config: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.request<T, R, D>({ ...config, signal }),
+      () => this.axios.request<T, R, D>({ ...reqConfig, signal }),
       controller,
     );
   }
@@ -85,10 +86,11 @@ export class RxjsAxios {
     url: string,
     config?: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.get<T, R, D>(url, { ...config, signal }),
+      () => this.axios.get<T, R, D>(url, { ...reqConfig, signal }),
       controller,
     );
   }
@@ -97,10 +99,11 @@ export class RxjsAxios {
     url: string,
     config?: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.delete<T, R, D>(url, { ...config, signal }),
+      () => this.axios.delete<T, R, D>(url, { ...reqConfig, signal }),
       controller,
     );
   }
@@ -109,10 +112,11 @@ export class RxjsAxios {
     url: string,
     config?: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.head<T, R, D>(url, { ...config, signal }),
+      () => this.axios.head<T, R, D>(url, { ...reqConfig, signal }),
       controller,
     );
   }
@@ -121,10 +125,11 @@ export class RxjsAxios {
     url: string,
     config?: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.options<T, R, D>(url, { ...config, signal }),
+      () => this.axios.options<T, R, D>(url, { ...reqConfig, signal }),
       controller,
     );
   }
@@ -134,10 +139,11 @@ export class RxjsAxios {
     data?: D,
     config?: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.post<T, R, D>(url, data, { ...config, signal }),
+      () => this.axios.post<T, R, D>(url, data, { ...reqConfig, signal }),
       controller,
     );
   }
@@ -147,10 +153,11 @@ export class RxjsAxios {
     data?: D,
     config?: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.put<T, R, D>(url, data, { ...config, signal }),
+      () => this.axios.put<T, R, D>(url, data, { ...reqConfig, signal }),
       controller,
     );
   }
@@ -160,10 +167,11 @@ export class RxjsAxios {
     data?: D,
     config?: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.patch<T, R, D>(url, data, { ...config, signal }),
+      () => this.axios.patch<T, R, D>(url, data, { ...reqConfig, signal }),
       controller,
     );
   }
@@ -173,10 +181,11 @@ export class RxjsAxios {
     data?: D,
     config?: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.postForm<T, R, D>(url, data, { ...config, signal }),
+      () => this.axios.postForm<T, R, D>(url, data, { ...reqConfig, signal }),
       controller,
     );
   }
@@ -186,10 +195,11 @@ export class RxjsAxios {
     data?: D,
     config?: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.putForm<T, R, D>(url, data, { ...config, signal }),
+      () => this.axios.putForm<T, R, D>(url, data, { ...reqConfig, signal }),
       controller,
     );
   }
@@ -199,14 +209,34 @@ export class RxjsAxios {
     data?: D,
     config?: AxiosRequestConfig<D>,
   ): Observable<R> {
+    const reqConfig = this.validateConfig(config);
     const { controller, signal } = this.makeCancellable();
 
     return observify(
-      () => this.axios.patchForm<T, R, D>(url, data, { ...config, signal }),
+      () => this.axios.patchForm<T, R, D>(url, data, { ...reqConfig, signal }),
       controller,
     );
   }
 
+  private validateConfig<D>(config?: AxiosRequestConfig<D>): AxiosRequestConfig<D> | undefined {
+    if (config !== undefined) {
+      const insteadMsg = "Instead, unsubscribe from the observable to cancel the request.";
+      const { cancelToken, signal, ...rest } = config;
+
+      if (cancelToken !== undefined) {
+        console.warn(`Use of "cancelToken" is deprecated by Axios and has no effect on rxjs-axios. ${insteadMsg}`);
+      }
+
+      if (signal !== undefined) {
+        console.warn(`Use of "signal" has no effect on rxjs-axios. ${insteadMsg}`);
+      }
+
+      return rest;
+    }
+
+    return config;
+  }
+
   private makeCancellable(): Abortable {
     const controller = new AbortController();
     const signal = controller.signal;
diff --git a/test/lib/RxjsAxios.test.ts b/test/lib/RxjsAxios.test.ts
index 617106d..c45e7ff 100644
--- a/test/lib/RxjsAxios.test.ts
+++ b/test/lib/RxjsAxios.test.ts
@@ -1,5 +1,5 @@
 import { expect, TypeFactories } from "@stackbuilders/assertive-ts";
-import otherAxios from "axios";
+import originalAxios from "axios";
 import FormData from "form-data";
 import { Observable } from "rxjs";
 import Sinon from "sinon";
@@ -10,11 +10,11 @@ import { RxjsAxios } from "../../src/lib/RxjsAxios";
 describe("[Unit] RxjsAxios.test.ts", () => {
   describe(".of", () => {
     it("creates an RxjsAxios instance from another Axios instance", () => {
-      const rxjsAxios = RxjsAxios.of(otherAxios);
+      const rxjsAxios = RxjsAxios.of(originalAxios);
 
       expect(Object(rxjsAxios))
         .asType(TypeFactories.object())
-        .toContainEntry(["axios", otherAxios]);
+        .toContainEntry(["axios", originalAxios]);
     });
   });
 
@@ -28,7 +28,7 @@ describe("[Unit] RxjsAxios.test.ts", () => {
 
   describe(".isAxiosError", () => {
     it("calls the same Axios method", () => {
-      const spy = Sinon.spy(otherAxios, "isAxiosError");
+      const spy = Sinon.spy(originalAxios, "isAxiosError");
 
       RxjsAxios.isAxiosError("foo");
 
@@ -38,7 +38,7 @@ describe("[Unit] RxjsAxios.test.ts", () => {
 
   describe(".isCancel", () => {
     it("calls the same Axios method", () => {
-      const spy = Sinon.spy(otherAxios, "isCancel");
+      const spy = Sinon.spy(originalAxios, "isCancel");
 
       RxjsAxios.isCancel("foo");
 
@@ -48,7 +48,7 @@ describe("[Unit] RxjsAxios.test.ts", () => {
 
   describe(".toFormData", () => {
     it("calls the same Axios method", () => {
-      const spy = Sinon.spy(otherAxios, "toFormData");
+      const spy = Sinon.spy(originalAxios, "toFormData");
 
       RxjsAxios.toFormData({ });
 
@@ -58,7 +58,7 @@ describe("[Unit] RxjsAxios.test.ts", () => {
 
   describe(".formToJSON", () => {
     it("calls the same Axios method", () => {
-      const spy = Sinon.spy(otherAxios, "formToJSON");
+      const spy = Sinon.spy(originalAxios, "formToJSON");
       const formData = new FormData();
 
       RxjsAxios.formToJSON(formData);
@@ -77,9 +77,9 @@ describe("[Unit] RxjsAxios.test.ts", () => {
 
   describe("#interceptors", () => {
     it("returns the instance interceptors", () => {
-      const rxjsAxios = RxjsAxios.of(otherAxios);
+      const rxjsAxios = RxjsAxios.of(originalAxios);
 
-      expect(rxjsAxios.interceptors).toBeSame(otherAxios.interceptors);
+      expect(rxjsAxios.interceptors).toBeSame(originalAxios.interceptors);
     });
   });
 
diff --git a/tslint.json b/tslint.json
index 620a894..fa5dea3 100644
--- a/tslint.json
+++ b/tslint.json
@@ -23,7 +23,7 @@
     "linebreak-style": [true, "LF"],
     "max-line-length": [true, 120],
     "member-access": [true, "check-constructor"],
-    "no-console": true,
+    "no-console": [true, "log"],
     "no-duplicate-imports": true,
     "no-namespace": false,
     "no-trailing-whitespace": true,
diff --git a/yarn.lock b/yarn.lock
index 1159855..d7e5ffd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4742,6 +4742,7 @@ __metadata:
     semantic-release: ^19.0.5
     sinon: ^14.0.2
     ts-node: ^10.9.1
+    tslib: ^2.4.1
     tslint: ^6.1.3
     tslint-eslint-rules: ^5.4.0
     typescript: ^4.8.4
@@ -5390,7 +5391,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"tslib@npm:^2.1.0":
+"tslib@npm:^2.1.0, tslib@npm:^2.4.1":
   version: 2.4.1
   resolution: "tslib@npm:2.4.1"
   checksum: 19480d6e0313292bd6505d4efe096a6b31c70e21cf08b5febf4da62e95c265c8f571f7b36fcc3d1a17e068032f59c269fab3459d6cd3ed6949eafecf64315fca