Update the build system [skip ci]

gulpfile.js

@@ -1,18 +1,14 @@
 import gulp from "gulp";
 import {spawn} from "node:child_process";
 import {readdir, readFile, rm, writeFile} from "node:fs/promises";
-import {delimiter, join, resolve} from "node:path";
-import {env} from "node:process";
+import {join} from "node:path";
 import pkg from "./package.json" with {type: "json"};
 
-// Initialize the build system.
-env.PATH = `${resolve("node_modules/.bin")}${delimiter}${env.PATH}`;
-
 /** Builds the project. */
 export async function build() {
 	const file = "src/client.ts";
 	await writeFile(file, (await readFile(file, "utf8")).replace(/#version = "\d+(\.\d+){2}"/, `#version = "${pkg.version}"`));
-	return $("tsc", ["--build", "src/tsconfig.json"]);
+	return exec("tsc", "--build", "src/tsconfig.json");
 }
 
 /** Deletes all generated files. */
@@ -24,25 +20,25 @@ export async function clean() {
 /** Performs the static analysis of source code. */
 export async function lint() {
 	await build();
-	await $("tsc", ["--build", "tsconfig.json"]);
-	return $("eslint", ["--config=etc/eslint.js", "gulpfile.js", "example", "src", "test"]);
+	await exec("tsc", "--build", "tsconfig.json");
+	return exec("eslint", "--config=etc/eslint.js", "gulpfile.js", "example", "src", "test");
 }
 
 /** Publishes the package. */
 export async function publish() {
-	for (const registry of ["https://registry.npmjs.org", "https://npm.pkg.github.com"]) await $("npm", ["publish", `--registry=${registry}`]);
-	for (const action of [["tag"], ["push", "origin"]]) await $("git", [...action, `v${pkg.version}`]);
+	for (const registry of ["https://registry.npmjs.org", "https://npm.pkg.github.com"]) await run("npm", "publish", `--registry=${registry}`);
+	for (const action of [["tag"], ["push", "origin"]]) await run("git", ...action, `v${pkg.version}`);
 }
 
 /** Runs the test suite. */
 export async function test() {
 	await build();
-	return $("node", ["--test", "--test-reporter=spec"]);
+	return run("node", "--test", "--test-reporter=spec");
 }
 
 /** Watches for file changes. */
 export function watch() {
-	return $("tsc", ["--build", "src/tsconfig.json", "--preserveWatchOutput", "--sourceMap", "--watch"]);
+	return exec("tsc", "--build", "src/tsconfig.json", "--preserveWatchOutput", "--sourceMap", "--watch");
 }
 
 /** The default task. */
@@ -51,15 +47,24 @@ export default gulp.series(
 	build
 );
 
+/**
+ * Executes a command from a local package.
+ * @param {string} command The command to run.
+ * @param {...string} args The command arguments.
+ * @return {Promise<void>} Resolves when the command is terminated.
+ */
+function exec(command, ...args) {
+	return run("npm", "exec", "--", command, ...args);
+}
+
 /**
  * Spawns a new process using the specified command.
  * @param {string} command The command to run.
- * @param {string[]} args The command arguments.
- * @param {import("node:child_process").SpawnOptionsWithoutStdio} options The settings to customize how the process is spawned.
+ * @param {...string} args The command arguments.
  * @return {Promise<void>} Resolves when the command is terminated.
  */
-function $(command, args = [], options = {}) {
+function run(command, ...args) {
 	const {promise, resolve: fulfill, reject} = /** @type {PromiseWithResolvers<void>} */ (Promise.withResolvers());
-	spawn(command, args, {shell: true, stdio: "inherit", ...options}).on("close", code => code ? reject(new Error(command)) : fulfill());
+	spawn(command, args, {shell: true, stdio: "inherit"}).on("close", code => code ? reject(new Error(command)) : fulfill());
 	return promise;
 }