refactor: add some missing explicit types (#3997)

* refactor: add some missing return types and mark some non-exported types as `@internal`

* Update expect/fn.ts

Co-authored-by: Asher Gomez <ashersaupingomez@gmail.com>

* Remove @Internals

* nits

---------

Co-authored-by: Asher Gomez <ashersaupingomez@gmail.com>

csv/csv_parse_stream.ts

@@ -167,7 +167,7 @@ export class CsvParseStream<
     }
   }
 
-  get readable() {
+  get readable(): ReadableStream<RowType<T>> {
     return this.#readable as ReadableStream<RowType<T>>;
   }
 

csv/parse.ts

@@ -13,7 +13,7 @@ import {
 } from "./_io.ts";
 import { assert } from "../assert/assert.ts";
 
-export { ParseError, ReadOptions };
+export { ParseError, type ParseResult, ReadOptions };
 
 const BYTE_ORDER_MARK = "\ufeff";
 

data_structures/binary_heap.ts

@@ -61,7 +61,7 @@ export class BinaryHeap<T> implements Iterable<T> {
   #data: T[] = [];
   constructor(private compare: (a: T, b: T) => number = descend) {}
   /** Returns the underlying cloned array in arbitrary order without sorting */
-  toArray() {
+  toArray(): T[] {
     return Array.from(this.#data);
   }
   /** Creates a new binary heap from an array like or iterable object. */

data_structures/comparators.ts

@@ -2,11 +2,11 @@
 /** This module is browser compatible. */
 
 /** Compares its two arguments for ascending order using JavaScript's built in comparison operators. */
-export function ascend<T>(a: T, b: T) {
+export function ascend<T>(a: T, b: T): -1 | 0 | 1 {
   return a < b ? -1 : a > b ? 1 : 0;
 }
 
 /** Compares its two arguments for descending order using JavaScript's built in comparison operators. */
-export function descend<T>(a: T, b: T) {
+export function descend<T>(a: T, b: T): -1 | 0 | 1 {
   return a < b ? 1 : a > b ? -1 : 0;
 }

datetime/constants.ts

@@ -22,7 +22,7 @@ export const SECOND = 1e3;
  * console.log(MINUTE); // => 60000 (60 * 1000)
  * ```
  */
-export const MINUTE = SECOND * 60;
+export const MINUTE: number = SECOND * 60;
 /**
  * The number of milliseconds in an hour.
  *
@@ -33,7 +33,7 @@ export const MINUTE = SECOND * 60;
  * console.log(HOUR); // => 3600000 (60 * 60 * 1000)
  * ```
  */
-export const HOUR = MINUTE * 60;
+export const HOUR: number = MINUTE * 60;
 /**
  * The number of milliseconds in a day.
  *
@@ -44,7 +44,7 @@ export const HOUR = MINUTE * 60;
  * console.log(DAY); // => 86400000 (24 * 60 * 60 * 1000)
  * ```
  */
-export const DAY = HOUR * 24;
+export const DAY: number = HOUR * 24;
 /**
  * The number of milliseconds in a week.
  *
@@ -55,4 +55,4 @@ export const DAY = HOUR * 24;
  * console.log(WEEK); // => 604800000 (7 * 24 * 60 * 60 * 1000)
  * ```
  */
-export const WEEK = DAY * 7;
+export const WEEK: number = DAY * 7;

dotenv/stringify.ts

@@ -12,7 +12,7 @@
  * @param object object to be stringified
  * @returns string of object
  */
-export function stringify(object: Record<string, string>) {
+export function stringify(object: Record<string, string>): string {
   const lines: string[] = [];
   for (const [key, value] of Object.entries(object)) {
     let quote;

expect/fn.ts

@@ -4,7 +4,7 @@
 
 import { MOCK_SYMBOL, MockCall } from "./_mock_util.ts";
 
-export function fn(...stubs: Function[]) {
+export function fn(...stubs: Function[]): Function {
   const calls: MockCall[] = [];
 
   const f = (...args: any[]) => {

fmt/colors.ts

@@ -567,7 +567,7 @@ const ANSI_PATTERN = new RegExp(
  * Remove ANSI escape codes from the string.
  * @param string to remove ANSI escape codes from
  */
-export const stripColor = stripAnsiCode;
+export const stripColor: typeof stripAnsiCode = stripAnsiCode;
 
 /**
  * Remove ANSI escape codes from the string.

front_matter/any.ts

@@ -1,6 +1,6 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 
-import { createExtractor, Parser } from "./create_extractor.ts";
+import { createExtractor, type Extractor, Parser } from "./create_extractor.ts";
 import { parse as parseYAML } from "../yaml/parse.ts";
 import { parse as parseTOML } from "../toml/parse.ts";
 
@@ -10,7 +10,7 @@ export {
   test,
 } from "./test.ts";
 
-export const extract = createExtractor({
+export const extract: Extractor = createExtractor({
   yaml: parseYAML as Parser,
   toml: parseTOML as Parser,
   json: JSON.parse as Parser,

front_matter/json.ts

@@ -1,6 +1,6 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 
-import { createExtractor, Parser } from "./create_extractor.ts";
+import { createExtractor, type Extractor, Parser } from "./create_extractor.ts";
 import { test as _test } from "./test.ts";
 
 export { Format } from "./_formats.ts";
@@ -10,6 +10,8 @@ export function test(str: string): boolean {
   return _test(str, ["json"]);
 }
 
-export const extract = createExtractor({ json: JSON.parse as Parser });
+export const extract: Extractor = createExtractor({
+  json: JSON.parse as Parser,
+});
 /** @deprecated (will be removed after 0.210.0) Import {@linkcode extract} as a named import instead. */
 export default extract;

front_matter/toml.ts

@@ -1,6 +1,6 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 
-import { createExtractor, Parser } from "./create_extractor.ts";
+import { createExtractor, type Extractor, Parser } from "./create_extractor.ts";
 import { test as _test } from "./test.ts";
 import { parse } from "../toml/parse.ts";
 
@@ -11,6 +11,8 @@ export function test(str: string): boolean {
   return _test(str, ["toml"]);
 }
 
-export const extract = createExtractor({ ["toml"]: parse as Parser });
+export const extract: Extractor = createExtractor({
+  ["toml"]: parse as Parser,
+});
 /** @deprecated (will be removed after 0.210.0) Import {@linkcode extract} as a named import instead. */
 export default extract;

front_matter/yaml.ts

@@ -1,6 +1,6 @@
 // Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
 
-import { createExtractor, Parser } from "./create_extractor.ts";
+import { createExtractor, type Extractor, Parser } from "./create_extractor.ts";
 import { test as _test } from "./test.ts";
 import { parse } from "../yaml/parse.ts";
 
@@ -11,6 +11,8 @@ export function test(str: string): boolean {
   return _test(str, ["yaml"]);
 }
 
-export const extract = createExtractor({ ["yaml"]: parse as Parser });
+export const extract: Extractor = createExtractor({
+  ["yaml"]: parse as Parser,
+});
 /** @deprecated (will be removed after 0.210.0) Import {@linkcode extract} as a named import instead. */
 export default extract;

html/entities.ts

@@ -36,7 +36,7 @@ const rawRe = new RegExp(`[${[...rawToEntity.keys()].join("")}]`, "g");
  * assertEquals(escape("þð"), "þð");
  * ```
  */
-export function escape(str: string) {
+export function escape(str: string): string {
   return str.replaceAll(rawRe, (m) => rawToEntity.get(m)!);
 }
 
@@ -73,7 +73,7 @@ const entityListRegexCache = new WeakMap<EntityList, RegExp>();
 export function unescape(
   str: string,
   options: Partial<UnescapeOptions> = {},
-) {
+): string {
   const { entityList } = { ...defaultUnescapeOptions, ...options };
 
   let entityRe = entityListRegexCache.get(entityList);

http/cookie_map.ts

@@ -146,7 +146,8 @@ export type SecureCookieMapSetDeleteOptions = SecureCookieMapSetDeleteOptions_;
  *
  * @deprecated (will be removed after 0.212.0) Use {@link https://deno.land/std/http/cookie.ts} instead.
  */
-export const cookieMapHeadersInitSymbol = cookieMapHeadersInitSymbol_;
+export const cookieMapHeadersInitSymbol: typeof cookieMapHeadersInitSymbol_ =
+  cookieMapHeadersInitSymbol_;
 
 /**
  * Allows merging of various sources of headers into a final set of headers
@@ -159,7 +160,7 @@ export const cookieMapHeadersInitSymbol = cookieMapHeadersInitSymbol_;
  *
  * @deprecated (will be removed after 0.212.0) Use {@link https://deno.land/std/http/cookie.ts} instead.
  */
-export const mergeHeaders = mergeHeaders_;
+export const mergeHeaders: typeof mergeHeaders_ = mergeHeaders_;
 
 /**
  * Provides a way to manage cookies in a request and response on the server
@@ -174,7 +175,7 @@ export const mergeHeaders = mergeHeaders_;
  *
  * @deprecated (will be removed after 0.212.0) Use {@link https://deno.land/std/http/cookie.ts} instead.
  */
-export const CookieMap = CookieMap_;
+export const CookieMap: typeof CookieMap_ = CookieMap_;
 
 /**
  * Types of data that can be signed cryptographically.
@@ -211,4 +212,4 @@ export type KeyRing = KeyRing_;
  *
  * @deprecated (will be removed after 0.212.0) Use {@link https://deno.land/std/http/unstable_signed_cookie.ts} instead.
  */
-export const SecureCookieMap = SecureCookieMap_;
+export const SecureCookieMap: typeof SecureCookieMap_ = SecureCookieMap_;

http/file_server.ts

@@ -608,7 +608,10 @@ export interface ServeDirOptions {
  *
  * @param req The request to handle
  */
-export async function serveDir(req: Request, opts: ServeDirOptions = {}) {
+export async function serveDir(
+  req: Request,
+  opts: ServeDirOptions = {},
+): Promise<Response> {
   let response: Response;
   try {
     response = await createServeDirResponse(req, opts);

http/http_status.ts

@@ -38,15 +38,15 @@ import * as status from "./status.ts";
 /**
  * @deprecated (will be removed after 0.210.0) Import from {@link https://deno.land/std/http/status.ts} instead.
  */
-export const Status = status.Status;
+export const Status: typeof status.Status = status.Status;
 /**
  * @deprecated (will be removed after 0.210.0) Import from {@link https://deno.land/std/http/status.ts} instead.
  */
 export type Status = status.Status;
 /**
  * @deprecated (will be removed after 0.210.0) Import from {@link https://deno.land/std/http/status.ts} instead.
  */
-export const STATUS_TEXT = status.STATUS_TEXT;
+export const STATUS_TEXT: typeof status.STATUS_TEXT = status.STATUS_TEXT;
 /**
  * @deprecated (will be removed after 0.210.0) Import from {@link https://deno.land/std/http/status.ts} instead.
  */
@@ -74,24 +74,29 @@ export type ErrorStatus = status.ErrorStatus;
 /**
  * @deprecated (will be removed after 0.210.0) Import from {@link https://deno.land/std/http/status.ts} instead.
  */
-export const isInformationalStatus = status.isInformationalStatus;
+export const isInformationalStatus: typeof status.isInformationalStatus =
+  status.isInformationalStatus;
 /**
  * @deprecated (will be removed after 0.210.0) Import from {@link https://deno.land/std/http/status.ts} instead.
  */
-export const isSuccessfulStatus = status.isSuccessfulStatus;
+export const isSuccessfulStatus: typeof status.isSuccessfulStatus =
+  status.isSuccessfulStatus;
 /**
  * @deprecated (will be removed after 0.210.0) Import from {@link https://deno.land/std/http/status.ts} instead.
  */
-export const isRedirectStatus = status.isRedirectStatus;
+export const isRedirectStatus: typeof status.isRedirectStatus =
+  status.isRedirectStatus;
 /**
  * @deprecated (will be removed after 0.210.0) Import from {@link https://deno.land/std/http/status.ts} instead.
  */
-export const isClientErrorStatus = status.isClientErrorStatus;
+export const isClientErrorStatus: typeof status.isClientErrorStatus =
+  status.isClientErrorStatus;
 /**
  * @deprecated (will be removed after 0.210.0) Import from {@link https://deno.land/std/http/status.ts} instead.
  */
-export const isServerErrorStatus = status.isServerErrorStatus;
+export const isServerErrorStatus: typeof status.isServerErrorStatus =
+  status.isServerErrorStatus;
 /**
  * @deprecated (will be removed after 0.210.0) Import from {@link https://deno.land/std/http/status.ts} instead.
  */
-export const isErrorStatus = status.isErrorStatus;
+export const isErrorStatus: typeof status.isErrorStatus = status.isErrorStatus;

http/server.ts

@@ -138,7 +138,7 @@ export class Server {
    *
    * @param listener The listener to accept connections from.
    */
-  async serve(listener: Deno.Listener) {
+  async serve(listener: Deno.Listener): Promise<void> {
     if (this.#closed) {
       throw new Deno.errors.Http(ERROR_SERVER_CLOSED);
     }
@@ -188,7 +188,7 @@ export class Server {
    * await server.listenAndServe();
    * ```
    */
-  async listenAndServe() {
+  async listenAndServe(): Promise<void> {
     if (this.#closed) {
       throw new Deno.errors.Http(ERROR_SERVER_CLOSED);
     }
@@ -238,7 +238,7 @@ export class Server {
    * @param certFile The path to the file containing the TLS certificate.
    * @param keyFile The path to the file containing the TLS private key.
    */
-  async listenAndServeTls(certFile: string, keyFile: string) {
+  async listenAndServeTls(certFile: string, keyFile: string): Promise<void> {
     if (this.#closed) {
       throw new Deno.errors.Http(ERROR_SERVER_CLOSED);
     }
@@ -559,7 +559,7 @@ export async function serveListener(
   listener: Deno.Listener,
   handler: Handler,
   options?: ServeListenerOptions,
-) {
+): Promise<void> {
   const server = new Server({ handler, onError: options?.onError });
 
   options?.signal?.addEventListener("abort", () => server.close(), {
@@ -626,7 +626,7 @@ function hostnameForDisplay(hostname: string) {
 export async function serve(
   handler: Handler,
   options: ServeInit = {},
-) {
+): Promise<void> {
   let port = options.port ?? 8000;
   if (typeof port !== "number") {
     port = Number(port);
@@ -744,7 +744,7 @@ export interface ServeTlsInit extends ServeInit {
 export async function serveTls(
   handler: Handler,
   options: ServeTlsInit,
-) {
+): Promise<void> {
   if (!options.key && !options.keyFile) {
     throw new Error("TLS config is given, but 'key' is missing.");
   }

http/unstable_cookie_map.ts

@@ -322,7 +322,7 @@ class Cookie implements CookieAttributes {
  *
  * @deprecated (will be removed in 0.212.0) Use {@link https://deno.land/std/http/cookie.ts} instead.
  */
-export const cookieMapHeadersInitSymbol = Symbol.for(
+export const cookieMapHeadersInitSymbol: unique symbol = Symbol.for(
   "Deno.std.cookieMap.headersInit",
 );
 
@@ -373,7 +373,8 @@ const isSecure = Symbol("#secure");
 const requestKeys = Symbol("#requestKeys");
 
 /** An internal abstract class which provides common functionality for
- * {@link CookieMap} and {@link SecureCookieMap}. */
+ * {@link CookieMap} and {@link SecureCookieMap}.
+ */
 abstract class CookieMapBase implements Mergeable {
   [keys]?: string[];
   [requestHeaders]: Headers;

http/user_agent.ts

@@ -1054,7 +1054,14 @@ export class UserAgent {
     return this.#ua;
   }
 
-  toJSON() {
+  toJSON(): {
+    browser: Browser;
+    cpu: Cpu;
+    device: Device;
+    engine: Engine;
+    os: Os;
+    ua: string;
+  } {
     const { browser, cpu, device, engine, os, ua } = this;
     return { browser, cpu, device, engine, os, ua };
   }