Formatting tools.

.editorconfig

@@ -0,0 +1,28 @@
+# editorconfig.org
+
+#
+# Formatting configuration for those that may choose to not use prettier.
+# At least serves as documentation for how code contributions should be
+# formatted.
+#
+
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+indent_size = 2
+max_line_length = 80
+
+[*.py]
+indent_style = space
+indent_size = 4
+
+[*.bat]
+end_of_line = crlf
+
+[Makefile]
+indent_style = tab

.npmignore

@@ -2,3 +2,6 @@ docs
 tests
 src
 .github
+.prettier*
+.editorconfig
+tsconfig.json

.prettierignore

@@ -0,0 +1,9 @@
+# Yes. Format these files when they are present.
+!.prettier*/
+!.mochar*/
+!.huskyr*/
+
+# No. Do not format these files.
+.github
+/docs
+node_modules/

.prettierrc.js

@@ -0,0 +1,34 @@
+/** Simple logger. */
+/* istanbul ignore next: Unnecessary. */
+if (!global.log) global.log = console;
+
+/** Formatter configuration. */
+const config = {
+	arrowParens: 'always',
+	bracketSpacing: true,
+	endOfLine: 'lf',
+	printWidth: 80,
+	proseWrap: 'never',
+	quoteProps: 'as-needed',
+	semi: true,
+	singleQuote: true,
+	tabWidth: 2,
+	trailingComma: 'all',
+	useTabs: true,
+	overrides: [
+		{
+			files: ['**/*.json', '**/*.yaml', '**/*.yml'],
+			options: {
+				useTabs: false,
+			},
+		},
+	],
+};
+
+if (typeof require !== 'undefined' && require.main === module) {
+	// When a script.
+	log.debug(JSON.stringify(config, null, 2));
+} else {
+	// When a module.
+	module.exports = config;
+}

package.json

@@ -7,7 +7,9 @@
     "test": "mocha --require ts-node/register ./tests/**/*.test.ts",
     "clean": "rimraf ./build ./docs",
     "docs": "typedoc --out docs src/index.ts",
-    "build": "tsc --build tsconfig.json"
+    "build": "tsc --build tsconfig.json",
+    "format": "prettier --write .",
+    "format:check": "prettier --check ."
   },
   "repository": {
     "type": "git",
@@ -27,6 +29,7 @@
     "@types/node": "^17.0.21",
     "chai": "^4.3.6",
     "mocha": "^9.2.2",
+    "prettier": "^2.7.1",
     "rimraf": "^3.0.2",
     "source-map-support": "^0.5.19",
     "ts-node": "^10.7.0",