add types

.github/workflows/node-aught.yml

@@ -9,3 +9,4 @@ jobs:
       range: '< 10'
       type: minors
       command: npm run tests-only
+      skip-ls-check: true

bin/import-or-require.js

@@ -4,6 +4,7 @@ const { extname: extnamePath } = require('path');
 const { pathToFileURL } = require('url');
 const getPackageType = require('get-package-type');
 
+/** @type {(file: string) => undefined | Promise<unknown>} */
 // eslint-disable-next-line consistent-return
 module.exports = function importOrRequire(file) {
 	const ext = extnamePath(file);

bin/tape

@@ -95,6 +95,7 @@ var hasImport = require('has-dynamic-import');
 
 var tape = require('../');
 
+/** @type {(hasSupport: boolean) => Promise<void> | void} */
 function importFiles(hasSupport) {
 	if (!hasSupport) {
 		return files.forEach(function (x) { require(x); });
@@ -104,6 +105,7 @@ function importFiles(hasSupport) {
 
 	tape.wait();
 
+	/** @type {null | undefined | Promise<unknown>} */
 	var filesPromise = files.reduce(function (promise, file) {
 		return promise ? promise.then(function () {
 			return importOrRequire(file);

index.d.ts

@@ -0,0 +1,82 @@
+import type { ThroughStream } from '@ljharb/through';
+
+import type Test from './lib/test';
+import type Results from './lib/results';
+
+declare function harnessFunction(this: ThisType<Test>, name: string, opts: tape.TestOptions, cb: tape.TestCase): Test;
+declare function harnessFunction(this: ThisType<Test>, name: string, opts: tape.TestOptions): Test;
+declare function harnessFunction(this: ThisType<Test>, name: string, cb: tape.TestCase): Test;
+declare function harnessFunction(this: ThisType<Test>, name: string): Test;
+declare function harnessFunction(this: ThisType<Test>, opts: tape.TestOptions, cb: tape.TestCase): Test;
+declare function harnessFunction(this: ThisType<Test>, opts: tape.TestOptions): Test;
+declare function harnessFunction(this: ThisType<Test>, cb: tape.TestCase): Test;
+
+declare namespace tape {
+    export type TestOptions = {
+        objectPrintDepth?: number | undefined;
+        skip?: boolean | undefined;
+        timeout?: number | undefined;
+        todo?: boolean | undefined;
+    };
+
+    export interface AssertOptions {
+        skip?: boolean | string | undefined;
+        todo?: boolean | string | undefined;
+        message?: string | undefined;
+        actual?: unknown;
+        expected?: unknown;
+        exiting?: boolean;
+    }
+
+    export interface TestCase {
+        (test: Test): void | Promise<void>;
+    }
+
+    export interface StreamOptions {
+        objectMode?: boolean | undefined;
+    }
+
+    function createStream(opts?: StreamOptions): ThroughStream;
+
+    export type CreateStream = typeof createStream;
+
+    export type HarnessEventHandler = (cb: Test.SyncCallback, ...rest: unknown[]) => void;
+
+    function only(name: string, cb: tape.TestCase): void;
+    function only(name: string, opts: tape.TestOptions, cb: tape.TestCase): void;
+    function only(cb: tape.TestCase): void;
+    function only(opts: tape.TestOptions, cb: tape.TestCase): void;
+
+    export type HarnessCallSignatures = typeof harnessFunction;
+
+    export interface Harness extends HarnessCallSignatures {
+        run?: () => void;
+        only: typeof only;
+        _exitCode: number;
+        _results: Results;
+        _tests: Test[];
+        close: () => void;
+        createStream: CreateStream;
+        onFailure: HarnessEventHandler;
+        onFinish: HarnessEventHandler;
+    }
+
+    export type HarnessConfig = {
+        autoclose?: boolean;
+        noOnly?: boolean;
+        stream?: NodeJS.WritableStream | ThroughStream;
+        exit?: boolean;
+    } & StreamOptions;
+
+    function createHarness(conf_?: HarnessConfig): Harness;
+    const Test: Test;
+    const test: typeof tape;
+    const skip: Test['skip'];
+}
+
+declare function tape(this: tape.Harness, name: string, opts: tape.TestOptions, cb: tape.TestCase): Test;
+declare function tape(this: tape.Harness, name: string, cb: tape.TestCase): Test;
+declare function tape(this: tape.Harness, opts?: tape.TestOptions): Test;
+declare function tape(this: tape.Harness, opts: tape.TestOptions, cb: tape.TestCase): Test;
+
+export = tape;

index.js

@@ -1,20 +1,36 @@
 'use strict';
 
 var defined = require('defined');
+var through = require('@ljharb/through');
+
 var createDefaultStream = require('./lib/default_stream');
 var Test = require('./lib/test');
 var Results = require('./lib/results');
-var through = require('@ljharb/through');
 
 var canEmitExit = typeof process !== 'undefined' && process
-	&& typeof process.on === 'function' && process.browser !== true;
+	// eslint-disable-next-line no-extra-parens
+	&& typeof process.on === 'function' && /** @type {{ browser?: boolean }} */ (process).browser !== true;
 var canExit = typeof process !== 'undefined' && process
 	&& typeof process.exit === 'function';
 
+/** @typedef {import('.')} Tape */
+/** @typedef {import('.').Harness} Harness */
+/** @typedef {import('.').HarnessConfig} HarnessConfig */
+/** @typedef {import('.').HarnessCallSignatures} HarnessCallSignatures */
+/** @typedef {import('.').TestOptions} TestOptions */
+/** @typedef {import('.').HarnessEventHandler} HarnessEventHandler */
+/** @typedef {import('.').CreateStream} CreateStream */
+/** @typedef {import('.').createHarness} CreateHarness */
+/** @typedef {import('./lib/results').Result} Result */
+/** @typedef {import('stream').Writable} WritableStream */
+/** @typedef {import('.').TestCase} TestCase */
+
 module.exports = (function () {
 	var wait = false;
+	/** @type {undefined | Harness} */
 	var harness;
 
+	/** @type {(opts?: HarnessConfig) => Harness} */
 	function getHarness(opts) {
 		// this override is here since tests fail via nyc if createHarness is moved upwards
 		if (!harness) {
@@ -24,6 +40,7 @@ module.exports = (function () {
 		return harness;
 	}
 
+	/** @type {(this: Harness, ...args: Parameters<Tape>) => ReturnType<Tape>} */
 	function lazyLoad() {
 		// eslint-disable-next-line no-invalid-this
 		return getHarness().apply(this, arguments);
@@ -43,6 +60,7 @@ module.exports = (function () {
 		return getHarness().only.apply(this, arguments);
 	};
 
+	/** @type {CreateStream} */
 	lazyLoad.createStream = function (opts) {
 		var options = opts || {};
 		if (!harness) {
@@ -66,21 +84,23 @@ module.exports = (function () {
 	return lazyLoad;
 }());
 
+/** @type {CreateHarness} */
 function createHarness(conf_) {
 	var results = new Results({ todoIsOK: !!(process.env.TODO_IS_OK === '1') });
 	if (!conf_ || conf_.autoclose !== false) {
 		results.once('done', function () { results.close(); });
 	}
 
+	/** @type {(name: string, conf: TestOptions, cb: TestCase) => Test} */
 	function test(name, conf, cb) {
 		var t = new Test(name, conf, cb);
 		test._tests.push(t);
 
 		(function inspectCode(st) {
-			st.on('test', function sub(st_) {
+			st.on('test', /** @type {(st: Test) => void} */ function sub(st_) {
 				inspectCode(st_);
 			});
-			st.on('result', function (r) {
+			st.on('result', /** @type {(r: Result) => void} */ function (r) {
 				if (!r.todo && !r.ok && typeof r !== 'string') { test._exitCode = 1; }
 			});
 		}(t));
@@ -90,21 +110,25 @@ function createHarness(conf_) {
 	}
 	test._results = results;
 
-	test._tests = [];
+	/** @type {Test[]} */ test._tests = [];
 
+	/** @type {CreateStream} */
 	test.createStream = function (opts) {
 		return results.createStream(opts);
 	};
 
+	/** @type {HarnessEventHandler} */
 	test.onFinish = function (cb) {
 		results.on('done', cb);
 	};
 
+	/** @type {HarnessEventHandler} */
 	test.onFailure = function (cb) {
 		results.on('fail', cb);
 	};
 
 	var only = false;
+	/** @type {() => Test} */
 	test.only = function () {
 		if (only) { throw new Error('there can only be one only test'); }
 		if (conf_ && conf_.noOnly) { throw new Error('`only` tests are prohibited'); }
@@ -117,9 +141,11 @@ function createHarness(conf_) {
 
 	test.close = function () { results.close(); };
 
+	// @ts-expect-error TODO FIXME: why is `test` not assignable to `Harness`???
 	return test;
 }
 
+/** @type {(conf: Omit<HarnessConfig, 'autoclose'>, wait?: boolean) => Harness} */
 function createExitHarness(config, wait) {
 	var noOnly = config.noOnly;
 	var objectMode = config.objectMode;
@@ -137,11 +163,12 @@ function createExitHarness(config, wait) {
 		if (running) { return; }
 		running = true;
 		var stream = harness.createStream({ objectMode: objectMode });
-		var es = stream.pipe(cStream || createDefaultStream());
+		// eslint-disable-next-line no-extra-parens
+		var es = stream.pipe(/** @type {WritableStream} */ (cStream || createDefaultStream()));
 		if (canEmitExit && es) { // in node v0.4, `es` is `undefined`
 			// TODO: use `err` arg?
 			// eslint-disable-next-line no-unused-vars
-			es.on('error', function (err) { harness._exitCode = 1; });
+			es.on('error', function (_) { harness._exitCode = 1; });
 		}
 		stream.on('end', function () { ended = true; });
 	}
@@ -180,6 +207,7 @@ function createExitHarness(config, wait) {
 }
 
 module.exports.createHarness = createHarness;
-module.exports.Test = Test;
-module.exports.test = module.exports; // tap compat
-module.exports.test.skip = Test.skip;
+var moduleExports = module.exports; // this hack is needed because TS has a bug with seemingly circular exports
+moduleExports.Test = Test;
+moduleExports.test = module.exports; // tap compat
+moduleExports.skip = Test.skip;

lib/default_stream.d.ts

@@ -0,0 +1,5 @@
+import type { ThroughStream } from "@ljharb/through";
+
+declare function defaultStream(): ThroughStream;
+
+export = defaultStream;

lib/default_stream.js

@@ -3,11 +3,13 @@
 var through = require('@ljharb/through');
 var fs = require('fs');
 
+/** @type {import('./default_stream')} */
 module.exports = function () {
 	var line = '';
 	var stream = through(write, flush);
 	return stream;
 
+	/** @type {(buf: unknown) => void} */
 	function write(buf) {
 		if (
 			buf == null // eslint-disable-line eqeqeq
@@ -16,10 +18,11 @@ module.exports = function () {
 			flush();
 			return;
 		}
-		for (var i = 0; i < buf.length; i++) {
-			var c = typeof buf === 'string'
-				? buf.charAt(i)
-				: String.fromCharCode(buf[i]);
+		var b = /** @type {string | ArrayLike<number>} */ (buf); // eslint-disable-line no-extra-parens
+		for (var i = 0; i < b.length; i++) {
+			var c = typeof b === 'string'
+				? b.charAt(i)
+				: String.fromCharCode(b[i]);
 			if (c === '\n') {
 				flush();
 			} else {

lib/results.d.ts

@@ -0,0 +1,52 @@
+import through from '@ljharb/through';
+import type { EventEmitter } from 'events';
+
+import type { StreamOptions } from '../';
+import Test = require('./test');
+
+declare class Results extends EventEmitter {
+    constructor(options?: { todoIsOK?: boolean });
+
+    count: number;
+    fail: number;
+    pass: number;
+    tests: Test[];
+    todo: number;
+    todoIsOK: boolean;
+    closed?: boolean;
+
+    _isRunning: boolean;
+    _only: Test | null;
+    _stream: through.ThroughStream;
+
+    close(this: Results): void;
+    createStream(this: Results, opts?: StreamOptions): through.ThroughStream;
+    only(this: Results, t: Test): void;
+    push(this: Results, t: Test): void;
+
+    _watch(this: Results, t: Test): void;
+}
+
+declare namespace Results {
+    export type Operator = string;
+
+    export type Result = {
+        id: number;
+        ok: boolean;
+        skip: unknown;
+        todo: unknown;
+        name?: string;
+        operator: undefined | Operator;
+        objectPrintDepth?: number;
+        actual?: unknown;
+        expected?: unknown;
+        error?: unknown;
+        functionName?: string;
+        file?: string;
+        line?: number;
+        column?: number;
+        at?: string;
+    };
+}
+
+export = Results;