Make the build-docs command silently fail if no template exists

.eslintrc

@@ -2,6 +2,7 @@
   "extends": "./shared/eslint.json",
   "rules": {
     "global-require": "off",
+    "no-bitwise": "off",
     "no-console": "off",
     "no-process-exit": "off"
   }

lib/commands/build-docs.js

@@ -5,7 +5,7 @@ const path = require('path');
 const { $ } = require('zx');
 const { readFile, writeFile } = require('fs').promises;
 
-const { loadConfig } = require('../utils');
+const { fileExists, loadConfig } = require('../utils');
 
 module.exports = {
   command: path.parse(__filename).name,
@@ -17,6 +17,7 @@ module.exports = {
     const { docs } = await loadConfig();
     const { files, headingDepth, noGfm, template } = docs || {};
     const templatePath = template || path.resolve(cwd, 'docs', 'templates', 'README.hbs');
+    if (!(await fileExists(templatePath))) return;
     const templateData = await readFile(templatePath, 'utf8');
     const cfg = {
       files: (Array.isArray(files) && files) || ['./lib/**/*.js'],

lib/utils.js

@@ -3,10 +3,13 @@
 const path = require('path');
 const prettier = require('prettier');
 const { cosmiconfig } = require('cosmiconfig');
-const { readFile, writeFile } = require('fs').promises;
+const { constants, promises } = require('fs');
 
 const { name } = require('../package.json');
 
+const { access, readFile, writeFile } = promises;
+const { F_OK, R_OK } = constants;
+
 /**
  * Loads the configuration for this tool from the target package.json file.
  *
@@ -61,4 +64,19 @@ async function storeJsonFile(file, data) {
   return writeFile(filePath, fileData, 'utf8');
 }
 
-module.exports = { loadConfig, loadJsonFile, pathFromCwd, storeJsonFile };
+/**
+ * Checks if the given file path exists and is readable.
+ *
+ * @param {string} file - The path of the file to check.
+ * @returns {Promise<boolean>}
+ */
+async function fileExists(file) {
+  try {
+    await access(file, F_OK | R_OK);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+module.exports = { fileExists, loadConfig, loadJsonFile, pathFromCwd, storeJsonFile };