feat:@discord.js/type-utils package

packages/type-utils/CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.

packages/type-utils/README.md

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+# `@discordjs/type-utils`
+
+> The type utilities module for Discord.js

packages/type-utils/__tests__/button.test.ts

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+import { MessageButtonOptions } from 'discord.js';
+import { isLinkButtonOptions } from '../src/lib/button';
+
+test('isLinkButtonOptions', () => {
+	const buttonData: MessageButtonOptions = {
+		style: 'LINK',
+		url: 'test',
+	};
+
+	expect(isLinkButtonOptions(buttonData)).toBe(true);
+
+	const invalidData: MessageButtonOptions = {
+		style: 'PRIMARY',
+		customId: '1234',
+	};
+
+	expect(isLinkButtonOptions(invalidData)).toBe(false);
+
+	// @ts-ignore
+	expect(() => isLinkButtonOptions({})).toThrowError();
+});

packages/type-utils/__tests__/command.test.ts

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+import { ApplicationCommandData, ApplicationCommandOptionData } from 'discord.js';
+import {
+	isChatInputCommandData,
+	isContextMenuCommandData,
+	optionDataSupportsChoices,
+	optionDataSupportsSubOptions,
+} from '../src/lib/command';
+import { validateType } from '../src/lib/util/enum';
+
+test('validateType', () => {
+	expect(() => validateType({})).toThrowError();
+});
+
+test('isContextMenuCommand', () => {
+	const nonTypedData: ApplicationCommandData = {
+		name: 'test',
+		description: 'test',
+	};
+
+	expect(isContextMenuCommandData(nonTypedData)).toBe(false);
+	expect(isChatInputCommandData(nonTypedData)).toBe(true);
+
+	const typedData: ApplicationCommandData = {
+		...nonTypedData,
+		type: 'CHAT_INPUT',
+	};
+
+	expect(isContextMenuCommandData(typedData)).toBe(false);
+
+	const invalidMessageData: ApplicationCommandData = {
+		name: 'test',
+		type: 'MESSAGE',
+	};
+
+	expect(isContextMenuCommandData(invalidMessageData)).toBe(true);
+	expect(isChatInputCommandData(invalidMessageData)).toBe(false);
+
+	const invalidUserData: ApplicationCommandData = {
+		name: 'test',
+		type: 'USER',
+	};
+
+	expect(isContextMenuCommandData(invalidUserData)).toBe(true);
+});
+
+test('optionsDataSupportsChoices', () => {
+	const subCommandData: ApplicationCommandOptionData = {
+		name: 'test',
+		type: 'SUB_COMMAND',
+		description: 'test',
+	};
+
+	expect(optionDataSupportsChoices(subCommandData)).toBe(false);
+
+	const stringData: ApplicationCommandOptionData = {
+		name: 'test',
+		type: 'STRING',
+		description: 'test',
+	};
+
+	expect(optionDataSupportsChoices(stringData)).toBe(true);
+});
+
+test('optionsDataSupportsSubOptions', () => {
+	const subCommandData: ApplicationCommandOptionData = {
+		name: 'test',
+		type: 'SUB_COMMAND',
+		description: 'test',
+	};
+
+	expect(optionDataSupportsSubOptions(subCommandData)).toBe(true);
+
+	const stringData: ApplicationCommandOptionData = {
+		name: 'test',
+		type: 'STRING',
+		description: 'test',
+	};
+
+	expect(optionDataSupportsSubOptions(stringData)).toBe(false);
+});

packages/type-utils/package.json

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+{
+	"$schema": "http://json.schemastore.org/package",
+	"name": "@discordjs/type-utils",
+	"version": "0.1.0-canary.0",
+	"description": "Type utilities for Discord.js and discord api types.",
+	"contributors": [
+		"Suneet Tipirneni <suneettipirneni@icloud.com>",
+		"NotSugden <email>"
+	],
+	"license": "Apache-2.0",
+	"scripts": {
+		"test": "echo \"Error: run tests from root\" && exit 1",
+		"build": "tsc --build --force"
+	},
+	"repository": {
+		"type": "git",
+		"url": "git+https://github.com/discordjs/discord.js-modules.git"
+	},
+	"bugs": {
+		"url": "https://github.com/discordjs/discord.js-modules/issues"
+	},
+	"homepage": "https://github.com/discordjs/discord.js-modules/tree/main/packages/type-utils",
+	"keywords": [
+		"discord",
+		"typeguards",
+		"typescript",
+		"discordapp",
+		"discordjs"
+	],
+	"main": "dist/index.js",
+	"directories": {
+		"lib": "src",
+		"test": "__tests__"
+	},
+	"files": [
+		"dist"
+	],
+	"devDependencies": {
+		"@types/node-fetch": "^2.5.10",
+		"discord.js": "^13.1.0"
+	},
+	"engines": {
+		"node": ">=16.0.0"
+	},
+	"publishConfig": {
+		"access": "public"
+	}
+}

packages/type-utils/src/index.ts

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+export * from './lib/command';

packages/type-utils/src/lib/button.ts

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+import { MessageButtonOptions, Constants, LinkButtonOptions } from 'discord.js';
+import { isPartOfEnum } from './util/enum';
+
+const { MessageButtonStyles } = Constants;
+
+/**
+ * Verifies if the given message button options support URLs or not.
+ * @param messageButtonOptions The message button options to check.
+ * @returns True if the option supports URLs, false otherwise.
+ */
+export function isLinkButtonOptions(buttonData: MessageButtonOptions): buttonData is LinkButtonOptions {
+	if (!('style' in buttonData)) {
+		throw new TypeError('INVALID_TYPE');
+	}
+
+	return isPartOfEnum(buttonData.style, MessageButtonStyles, ['LINK']);
+}

packages/type-utils/src/lib/command.ts

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+import {
+	ApplicationCommandData,
+	UserApplicationCommandData,
+	MessageApplicationCommandData,
+	ApplicationCommandChoicesData,
+	ApplicationCommandOptionData,
+	ApplicationCommandSubCommandData,
+	ApplicationCommandSubGroupData,
+	ChatInputApplicationCommandData,
+	Constants,
+} from 'discord.js';
+import { isPartOfEnum, validateType } from './util/enum';
+
+const { ApplicationCommandOptionTypes, ApplicationCommandTypes } = Constants;
+
+/**
+ * Whether or not the command supports a description or options.
+ * @param commandData The application command data to check.
+ * @returns True if the command is a context menu command, false otherwise.
+ */
+export function isContextMenuCommandData(
+	commandData: ApplicationCommandData,
+): commandData is UserApplicationCommandData | MessageApplicationCommandData {
+	if (!commandData.type) {
+		return false;
+	}
+
+	validateType(commandData);
+
+	return isPartOfEnum(commandData.type, ApplicationCommandTypes, ['MESSAGE', 'USER']);
+}
+
+/**
+ * Whether or not the command supports a description or options.
+ * @param commandData The application command data to check.
+ * @returns True if the command is a chat input command, false otherwise.
+ */
+export function isChatInputCommandData(
+	commandData: ApplicationCommandData,
+): commandData is ChatInputApplicationCommandData {
+	return !isContextMenuCommandData(commandData);
+}
+
+/**
+ * Verifies if the given command option data supports choices or not.
+ * @param commandOptionData The command option data to check.
+ * @returns True if the option supports choices, false otherwise.
+ */
+export function optionDataSupportsChoices(
+	optionData: ApplicationCommandOptionData,
+): optionData is ApplicationCommandChoicesData {
+	validateType(optionData);
+	return isPartOfEnum(optionData.type, ApplicationCommandOptionTypes, ['INTEGER', 'STRING', 'NUMBER']);
+}
+
+/**
+ * Verifies if the given command option data supports choices or not.
+ * @param {ApplicationCommandOptionData} commandOptionData The command option data to check.
+ * @returns {boolean} True if the option supports choices, false otherwise.
+ */
+export function optionDataSupportsSubOptions(
+	optionData: ApplicationCommandOptionData,
+): optionData is ApplicationCommandSubGroupData | ApplicationCommandSubCommandData {
+	validateType(optionData);
+	return isPartOfEnum(optionData.type, ApplicationCommandOptionTypes, ['SUB_COMMAND', 'SUB_COMMAND_GROUP']);
+}

packages/type-utils/src/lib/util/enum.ts

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+/**
+ * Resolves a given type to an enum equivalent value, and
+ * checks if it's part of the given enum type.
+ * @param type The type to resolve
+ * @param object The enum to resolve to
+ * @param fields The enum fields to check
+ * @returns Whether the type is part of the enum or not.
+ */
+export function isPartOfEnum(type: string | number, object: Record<string, unknown>, fields: string[]): boolean {
+	const resolvedType = typeof type === 'number' ? type : object[type];
+	return fields.some((field) => object[field] === resolvedType);
+}
+
+/**
+ * Throws a type error if the object has no `type field`.
+ * @param object The object to type check.
+ * @private
+ */
+export function validateType(object: any) {
+	if (!('type' in object)) {
+		throw new TypeError('INVALID_TYPE');
+	}
+}

packages/type-utils/tsconfig.json

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+{
+	"extends": "../tsconfig.base.json",
+	"compilerOptions": {
+		"sourceRoot": "./",
+		"rootDir": "./src",
+		"outDir": "dist",
+		"lib": ["ESNext"]
+	},
+	"include": ["src"],
+	"references": [{ "path": "../core" }]
+}