Hooks: Type package

.eslintignore

@@ -1,6 +1,7 @@
 .cache
 build
 build-module
+build-types
 node_modules
 packages/block-serialization-spec-parser/parser.js
 packages/e2e-tests/plugins

packages/block-editor/tsconfig.json

@@ -4,14 +4,9 @@
 		"rootDir": "src",
 		"declarationDir": "build-types"
 	},
-	"references": [
-		{ "path": "../element" }
-	],
+	"references": [ { "path": "../element" }, { "path": "../hooks" } ],
 	// NOTE: This package is being progressively typed. You are encouraged to
 	// expand this array with files which can be type-checked. At some point in
 	// the future, this can be simplified to an `includes` of `src/**/*`.
-	"files": [
-		"src/components/block-context/index.js",
-		"src/utils/dom.js"
-	]
+	"files": [ "src/components/block-context/index.js", "src/utils/dom.js" ]
 }

packages/components/tsconfig.json

@@ -4,7 +4,7 @@
 		"rootDir": "src",
 		"declarationDir": "build-types"
 	},
-	"references": [ { "path": "../primitives" } ],
+	"references": [ { "path": "../hooks" }, { "path": "../primitives" } ],
 	"include": [
 		"src/base-control/**/*",
 		"src/dashicon/**/*",

packages/hooks/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### New Feature
+
+- Include TypeScript type declarations ([#26430](https://github.com/WordPress/gutenberg/pull/26430))
+
 ## 2.6.0 (2019-08-29)
 
 ### New Feature

packages/hooks/package.json

@@ -21,6 +21,7 @@
 	"main": "build/index.js",
 	"module": "build-module/index.js",
 	"react-native": "src/index",
+	"types": "build-types",
 	"dependencies": {
 		"@babel/runtime": "^7.11.2"
 	},

packages/hooks/src/createAddHook.js

@@ -5,22 +5,25 @@ import validateNamespace from './validateNamespace.js';
 import validateHookName from './validateHookName.js';
 import { doAction } from './';
 
+/**
+ * @callback AddHook
+ *
+ * Adds the hook to the appropriate hooks container.
+ *
+ * @param {string}               hookName  Name of hook to add
+ * @param {string}               namespace The unique namespace identifying the callback in the form `vendor/plugin/function`.
+ * @param {import('.').Callback} callback  Function to call when the hook is run
+ * @param {number}              [priority=10]  Priority of this hook
+ */
+
 /**
  * Returns a function which, when invoked, will add a hook.
  *
- * @param  {Object}   hooks Stored hooks, keyed by hook name.
+ * @param  {import('.').Hooks} hooks Stored hooks, keyed by hook name.
  *
- * @return {Function}       Function that adds a new hook.
+ * @return {AddHook} Function that adds a new hook.
  */
 function createAddHook( hooks ) {
-	/**
-	 * Adds the hook to the appropriate hooks container.
-	 *
-	 * @param {string}   hookName  Name of hook to add
-	 * @param {string}   namespace The unique namespace identifying the callback in the form `vendor/plugin/function`.
-	 * @param {Function} callback  Function to call when the hook is run
-	 * @param {?number}  priority  Priority of this hook (default=10)
-	 */
 	return function addHook( hookName, namespace, callback, priority = 10 ) {
 		if ( ! validateHookName( hookName ) ) {
 			return;
@@ -51,6 +54,7 @@ function createAddHook( hooks ) {
 			// Find the correct insert index of the new hook.
 			const handlers = hooks[ hookName ].handlers;
 
+			/** @type {number} */
 			let i;
 			for ( i = handlers.length; i > 0; i-- ) {
 				if ( priority >= handlers[ i - 1 ].priority ) {
@@ -70,7 +74,7 @@ function createAddHook( hooks ) {
 			// we're adding would come after the current callback, there's no
 			// problem; otherwise we need to increase the execution index of
 			// any other runs by 1 to account for the added element.
-			( hooks.__current || [] ).forEach( ( hookInfo ) => {
+			hooks.__current.forEach( ( hookInfo ) => {
 				if (
 					hookInfo.name === hookName &&
 					hookInfo.currentIndex >= i

packages/hooks/src/createCurrentHook.js

@@ -3,24 +3,13 @@
  * currently running hook, or `null` if no hook of the given type is currently
  * running.
  *
- * @param  {Object}   hooks          Stored hooks, keyed by hook name.
+ * @param  {import('.').Hooks} hooks Stored hooks, keyed by hook name.
  *
- * @return {Function}                Function that returns the current hook.
+ * @return {() => string | null} Function that returns the current hook name or null.
  */
 function createCurrentHook( hooks ) {
-	/**
-	 * Returns the name of the currently running hook, or `null` if no hook of
-	 * the given type is currently running.
-	 *
-	 * @return {?string}             The name of the currently running hook, or
-	 *                               `null` if no hook is currently running.
-	 */
 	return function currentHook() {
-		if ( ! hooks.__current || ! hooks.__current.length ) {
-			return null;
-		}
-
-		return hooks.__current[ hooks.__current.length - 1 ].name;
+		return hooks.__current[ hooks.__current.length - 1 ]?.name ?? null;
 	};
 }
 

packages/hooks/src/createDidHook.js

@@ -3,22 +3,25 @@
  */
 import validateHookName from './validateHookName.js';
 
+/**
+ * @callback DidHook
+ *
+ * Returns the number of times an action has been fired.
+ *
+ * @param  {string} hookName The hook name to check.
+ *
+ * @return {number | undefined} The number of times the hook has run.
+ */
+
 /**
  * Returns a function which, when invoked, will return the number of times a
  * hook has been called.
  *
- * @param  {Object}   hooks Stored hooks, keyed by hook name.
+ * @param  {import('.').Hooks} hooks Stored hooks, keyed by hook name.
  *
- * @return {Function}       Function that returns a hook's call count.
+ * @return {DidHook} Function that returns a hook's call count.
  */
 function createDidHook( hooks ) {
-	/**
-	 * Returns the number of times an action has been fired.
-	 *
-	 * @param  {string} hookName The hook name to check.
-	 *
-	 * @return {number}          The number of times the hook has run.
-	 */
 	return function didHook( hookName ) {
 		if ( ! validateHookName( hookName ) ) {
 			return;

packages/hooks/src/createDoingHook.js

@@ -1,21 +1,23 @@
+/**
+ * @callback DoingHook
+ * Returns whether a hook is currently being executed.
+ *
+ * @param  {string} [hookName] The name of the hook to check for.  If
+ *                             omitted, will check for any hook being executed.
+ *
+ * @return {boolean} Whether the hook is being executed.
+ */
+
 /**
  * Returns a function which, when invoked, will return whether a hook is
  * currently being executed.
  *
- * @param  {Object}   hooks Stored hooks, keyed by hook name.
+ * @param  {import('.').Hooks} hooks Stored hooks, keyed by hook name.
  *
- * @return {Function}       Function that returns whether a hook is currently
- *                          being executed.
+ * @return {DoingHook} Function that returns whether a hook is currently
+ *                     being executed.
  */
 function createDoingHook( hooks ) {
-	/**
-	 * Returns whether a hook is currently being executed.
-	 *
-	 * @param  {?string} hookName The name of the hook to check for.  If
-	 *                            omitted, will check for any hook being executed.
-	 *
-	 * @return {boolean}             Whether the hook is being executed.
-	 */
 	return function doingHook( hookName ) {
 		// If the hookName was not passed, check for any current hook.
 		if ( 'undefined' === typeof hookName ) {

packages/hooks/src/createHasHook.js

@@ -1,22 +1,24 @@
+/**
+ * @callback HasHook
+ *
+ * Returns whether any handlers are attached for the given hookName and optional namespace.
+ *
+ * @param {string} hookName    The name of the hook to check for.
+ * @param {string} [namespace] Optional. The unique namespace identifying the callback
+ *                             in the form `vendor/plugin/function`.
+ *
+ * @return {boolean} Whether there are handlers that are attached to the given hook.
+ */
 /**
  * Returns a function which, when invoked, will return whether any handlers are
  * attached to a particular hook.
  *
- * @param  {Object}   hooks Stored hooks, keyed by hook name.
+ * @param  {import('.').Hooks} hooks Stored hooks, keyed by hook name.
  *
- * @return {Function}       Function that returns whether any handlers are
- *                          attached to a particular hook and optional namespace.
+ * @return {HasHook} Function that returns whether any handlers are
+ *                   attached to a particular hook and optional namespace.
  */
 function createHasHook( hooks ) {
-	/**
-	 * Returns whether any handlers are attached for the given hookName and optional namespace.
-	 *
-	 * @param {string}  hookName  The name of the hook to check for.
-	 * @param {?string} namespace Optional. The unique namespace identifying the callback
-	 *                                      in the form `vendor/plugin/function`.
-	 *
-	 * @return {boolean} Whether there are handlers that are attached to the given hook.
-	 */
 	return function hasHook( hookName, namespace ) {
 		// Use the namespace if provided.
 		if ( 'undefined' !== typeof namespace ) {

packages/hooks/src/createHooks.js

@@ -11,11 +11,11 @@ import createDidHook from './createDidHook';
 
 /**
  * Returns an instance of the hooks object.
- *
- * @return {Object} Object that contains all hooks.
  */
 function createHooks() {
+	/** @type {import('.').Hooks} */
 	const actions = Object.create( null );
+	/** @type {import('.').Hooks} */
 	const filters = Object.create( null );
 	actions.__current = [];
 	filters.__current = [];

packages/hooks/src/createRemoveHook.js

@@ -5,25 +5,30 @@ import validateNamespace from './validateNamespace.js';
 import validateHookName from './validateHookName.js';
 import { doAction } from './';
 
+/**
+ * @callback RemoveHook
+ * Removes the specified callback (or all callbacks) from the hook with a given hookName
+ * and namespace.
+ *
+ * @param {string} hookName  The name of the hook to modify.
+ * @param {string} namespace The unique namespace identifying the callback in the
+ *                           form `vendor/plugin/function`.
+ *
+ * @return {number | undefined} The number of callbacks removed.
+ */
+
 /**
  * Returns a function which, when invoked, will remove a specified hook or all
  * hooks by the given name.
  *
- * @param  {Object}   hooks      Stored hooks, keyed by hook name.
- * @param  {boolean}     removeAll  Whether to remove all callbacks for a hookName, without regard to namespace. Used to create `removeAll*` functions.
+ * @param  {import('.').Hooks} hooks             Stored hooks, keyed by hook name.
+ * @param  {boolean}           [removeAll=false] Whether to remove all callbacks for a hookName,
+ *                                               without regard to namespace. Used to create
+ *                                               `removeAll*` functions.
  *
- * @return {Function}            Function that removes hooks.
+ * @return {RemoveHook} Function that removes hooks.
  */
-function createRemoveHook( hooks, removeAll ) {
-	/**
-	 * Removes the specified callback (or all callbacks) from the hook with a
-	 * given hookName and namespace.
-	 *
-	 * @param {string}    hookName  The name of the hook to modify.
-	 * @param {string}    namespace The unique namespace identifying the callback in the form `vendor/plugin/function`.
-	 *
-	 * @return {number}             The number of callbacks removed.
-	 */
+function createRemoveHook( hooks, removeAll = false ) {
 	return function removeHook( hookName, namespace ) {
 		if ( ! validateHookName( hookName ) ) {
 			return;
@@ -58,7 +63,7 @@ function createRemoveHook( hooks, removeAll ) {
 					// comes after the current callback, there's no problem;
 					// otherwise we need to decrease the execution index of any
 					// other runs by 1 to account for the removed element.
-					( hooks.__current || [] ).forEach( ( hookInfo ) => {
+					hooks.__current.forEach( ( hookInfo ) => {
 						if (
 							hookInfo.name === hookName &&
 							hookInfo.currentIndex >= i

packages/hooks/src/createRunHook.js

@@ -3,21 +3,13 @@
  * registered to a hook of the specified type, optionally returning the final
  * value of the call chain.
  *
- * @param  {Object}   hooks          Stored hooks, keyed by hook name.
- * @param  {?boolean}    returnFirstArg Whether each hook callback is expected to
- *                                   return its first argument.
+ * @param  {import('.').Hooks} hooks                  Stored hooks, keyed by hook name.
+ * @param  {boolean}           [returnFirstArg=false] Whether each hook callback is expected to
+ *                                                    return its first argument.
  *
- * @return {Function}                Function that runs hook callbacks.
+ * @return {(hookName:string, ...args: unknown[]) => unknown} Function that runs hook callbacks.
  */
-function createRunHook( hooks, returnFirstArg ) {
-	/**
-	 * Runs all callbacks for the specified hook.
-	 *
-	 * @param  {string} hookName The name of the hook to run.
-	 * @param  {...*}   args     Arguments to pass to the hook callbacks.
-	 *
-	 * @return {*}               Return value of runner, if applicable.
-	 */
+function createRunHook( hooks, returnFirstArg = false ) {
 	return function runHooks( hookName, ...args ) {
 		if ( ! hooks[ hookName ] ) {
 			hooks[ hookName ] = {

packages/hooks/src/index.js

@@ -3,6 +3,32 @@
  */
 import createHooks from './createHooks';
 
+/** @typedef {(...args: any[])=>any} Callback */
+
+/**
+ * @typedef Handler
+ * @property {Callback} callback  The callback
+ * @property {string}   namespace The namespace
+ * @property {number}   priority  The namespace
+ */
+
+/**
+ * @typedef Hook
+ * @property {Handler[]} handlers Array of handlers
+ * @property {number}    runs     Run counter
+ *
+ */
+
+/**
+ * @typedef Current
+ * @property {string} name         Hook name
+ * @property {number} currentIndex The index
+ */
+
+/**
+ * @typedef {Record<string, Hook> & {__current: Current[]}} Hooks
+ */
+
 const {
 	addAction,
 	addFilter,

packages/hooks/tsconfig.json

@@ -0,0 +1,9 @@
+{
+	"extends": "../../tsconfig.base.json",
+	"compilerOptions": {
+		"rootDir": "src",
+		"declarationDir": "build-types",
+		"types": [ "gutenberg-env" ]
+	},
+	"include": [ "src/**/*" ]
+}

tsconfig.json

@@ -12,6 +12,7 @@
 		{ "path": "packages/escape-html" },
 		{ "path": "packages/eslint-plugin" },
 		{ "path": "packages/html-entities" },
+		{ "path": "packages/hooks" },
 		{ "path": "packages/i18n" },
 		{ "path": "packages/icons" },
 		{ "path": "packages/is-shallow-equal" },

typings/gutenberg-env/index.d.ts

@@ -1,7 +1,7 @@
 interface Environment {
-	NODE_ENV?: unknown;
+	NODE_ENV: unknown;
 }
 interface Process {
-	env?: Environment;
+	env: Environment;
 }
 declare var process: Process;