build: add type definitions

index.js

@@ -119,7 +119,7 @@ Accepts.prototype.types = function (types_) {
  *     ['gzip', 'deflate']
  *
  * @param {String|Array} encodings...
- * @return {String|Array}
+ * @return {String|Array|Boolean}
  * @public
  */
 
@@ -152,7 +152,7 @@ Accepts.prototype.encodings = function (encodings_) {
  *     ['utf-8', 'utf-7', 'iso-8859-1']
  *
  * @param {String|Array} charsets...
- * @return {String|Array}
+ * @return {String|Array|Boolean}
  * @public
  */
 
@@ -185,7 +185,7 @@ Accepts.prototype.charsets = function (charsets_) {
  *     ['es', 'pt', 'en']
  *
  * @param {String|Array} langs...
- * @return {Array|String}
+ * @return {String|Array|Boolean}
  * @public
  */
 

package.json

@@ -2,6 +2,7 @@
   "name": "accepts",
   "description": "Higher-level content negotiation",
   "version": "1.3.8",
+  "types": "types/index.d.ts",
   "contributors": [
     "Douglas Christopher Wilson <doug@somethingdoug.com>",
     "Jonathan Ong <me@jongleberry.com> (http://jongleberry.com)"
@@ -13,6 +14,7 @@
     "negotiator": "0.6.3"
   },
   "devDependencies": {
+    "@types/node": "18.11.18",
     "deep-equal": "1.0.1",
     "eslint": "7.32.0",
     "eslint-config-standard": "14.1.1",
@@ -22,12 +24,14 @@
     "eslint-plugin-promise": "4.3.1",
     "eslint-plugin-standard": "4.1.0",
     "mocha": "9.2.0",
-    "nyc": "15.1.0"
+    "nyc": "15.1.0",
+    "tsd": "^0.25.0"
   },
   "files": [
     "LICENSE",
     "HISTORY.md",
-    "index.js"
+    "index.js",
+    "types/index.d.ts"
   ],
   "engines": {
     "node": ">= 0.6"
@@ -36,7 +40,8 @@
     "lint": "eslint .",
     "test": "mocha --reporter spec --check-leaks --bail test/",
     "test-ci": "nyc --reporter=lcov --reporter=text npm test",
-    "test-cov": "nyc --reporter=html --reporter=text npm test"
+    "test-cov": "nyc --reporter=html --reporter=text npm test",
+    "test-typescript": "tsd"
   },
   "keywords": [
     "content",

types/index.d.ts

@@ -0,0 +1,94 @@
+/// <reference types="node" />
+
+import { IncomingMessage } from "http";
+
+declare namespace accepts {
+    interface Accepts {
+        /**
+         * Return the first accepted charset. If nothing in `charsets` is accepted, then `false` is returned.
+         * If no charsets are supplied, all accepted charsets are returned, in the order of the client's preference
+         * (most preferred first).
+         */
+        charset(): string[];
+        charset(charsets: string[]): string | string[] | false;
+        charset(...charsets: string[]): string | string[] | false;
+
+        /**
+         * Return the first accepted charset. If nothing in `charsets` is accepted, then `false` is returned.
+         * If no charsets are supplied, all accepted charsets are returned, in the order of the client's preference
+         * (most preferred first).
+         */
+        charsets(): string[];
+        charsets(charsets: string[]): string | string[] | false;
+        charsets(...charsets: string[]): string | string[] | false;
+
+        /**
+         * Return the first accepted encoding. If nothing in `encodings` is accepted, then `false` is returned.
+         * If no encodings are supplied, all accepted encodings are returned, in the order of the client's preference
+         * (most preferred first).
+         */
+        encoding(): string[];
+        encoding(encodings: string[]): string | string[] | false;
+        encoding(...encodings: string[]): string | string[] | false;
+
+        /**
+         * Return the first accepted encoding. If nothing in `encodings` is accepted, then `false` is returned.
+         * If no encodings are supplied, all accepted encodings are returned, in the order of the client's preference
+         * (most preferred first).
+         */
+        encodings(): string[];
+        encodings(encodings: string[]): string | string[] | false;
+        encodings(...encodings: string[]): string | string[] | false;
+
+        /**
+         * Return the first accepted language. If nothing in `languages` is accepted, then `false` is returned.
+         * If no languaes are supplied, all accepted languages are returned, in the order of the client's preference
+         * (most preferred first).
+         */
+        language(): string[];
+        language(languages: string[]): string | string[] | false;
+        language(...languages: string[]): string | string[] | false;
+
+        /**
+         * Return the first accepted language. If nothing in `languages` is accepted, then `false` is returned.
+         * If no languaes are supplied, all accepted languages are returned, in the order of the client's preference
+         * (most preferred first).
+         */
+        languages(): string[];
+        languages(languages: string[]): string | string[] | false;
+        languages(...languages: string[]): string | string[] | false;
+
+        /**
+         * Return the first accepted language. If nothing in `languages` is accepted, then `false` is returned.
+         * If no languaes are supplied, all accepted languages are returned, in the order of the client's preference
+         * (most preferred first).
+         */
+        lang(): string[];
+        lang(languages: string[]): string | string[] | false;
+        lang(...languages: string[]): string | string[] | false;
+
+        /**
+         * Return the first accepted language. If nothing in `languages` is accepted, then `false` is returned.
+         * If no languaes are supplied, all accepted languages are returned, in the order of the client's preference
+         * (most preferred first).
+         */
+        langs(): string[];
+        langs(languages: string[]): string | string[] | false;
+        langs(...languages: string[]): string | string[] | false;
+
+        /**
+         * Return the first accepted type (and it is returned as the same text as what appears in the `types` array). If nothing in `types` is accepted, then `false` is returned.
+         * If no types are supplied, return the entire set of acceptable types.
+         *
+         * The `types` array can contain full MIME types or file extensions. Any value that is not a full MIME types is passed to `require('mime-types').lookup`.
+         */
+        type(types: string[]): string | string[] | false;
+        type(...types: string[]): string | string[] | false;
+        types(types: string[]): string | string[] | false;
+        types(...types: string[]): string | string[] | false;
+    }
+}
+
+declare function accepts(req: IncomingMessage): accepts.Accepts;
+
+export = accepts;

types/index.test-d.ts

@@ -0,0 +1,29 @@
+import accepts from "..";
+
+const req: any = {};
+
+const accept = accepts(req);
+
+const charsets = accept.charsets();
+const charsetFromEmpty = accept.charset();
+const charsetFromEmptyArray = accept.charset([]);
+const charsetFromParams = accept.charset("json", "text");
+const charsetFromArray = accept.charset(["json", "txt"]);
+
+const encodings = accept.encodings();
+const encodingFromEmpty = accept.encoding();
+const encodingFromEmptyArray = accept.encoding([]);
+const encodingFromParams = accept.encoding("json", "text");
+const encodingFromArray = accept.encoding(["json", "text"]);
+
+const languages = accept.languages();
+const languageFromEmpty = accept.language();
+const languageFromEmptyArray = accept.language([]);
+const languageFromParams = accept.language("json", "text");
+const languageFromArray = accept.language(["json", "text"]);
+
+const types = accept.types();
+const typeFromEmpty = accept.type();
+const typeFromEmptyArray = accept.type([]);
+const typeFromParams = accept.type("json", "text");
+const typeFromArray = accept.type(["json", "text"]);