diff --git a/lib/__tests__/cli.test.js b/lib/__tests__/cli.test.js
new file mode 100644
index 0000000000..f306d86656
--- /dev/null
+++ b/lib/__tests__/cli.test.js
@@ -0,0 +1,140 @@
+'use strict';
+
+const { buildCLI } = require('../cli');
+
+describe('buildCLI', () => {
+	it('flags - default', () => {
+		expect(buildCLI([]).flags).toEqual({
+			allowEmptyInput: false,
+			cache: false,
+			color: false,
+			disableDefaultIgnores: false,
+			fix: false,
+			formatter: 'string',
+			help: false,
+			ignoreDisables: false,
+			printConfig: false,
+			quiet: false,
+			reportInvalidScopeDisables: false,
+			reportNeedlessDisables: false,
+			version: false,
+		});
+	});
+
+	it('flags.allowEmptyInput', () => {
+		expect(buildCLI(['--allow-empty-input']).flags.allowEmptyInput).toBe(true);
+		expect(buildCLI(['--aei']).flags.allowEmptyInput).toBe(true);
+	});
+
+	it('flags.cache', () => {
+		expect(buildCLI(['--cache']).flags.cache).toBe(true);
+	});
+
+	it('flags.cacheLocation', () => {
+		expect(buildCLI(['--cache-location=foo']).flags.cacheLocation).toBe('foo');
+	});
+
+	it('flags.color', () => {
+		expect(buildCLI(['--color']).flags.color).toBe(true);
+		expect(buildCLI(['--no-color']).flags.color).toBe(false);
+	});
+
+	it('flags.config', () => {
+		expect(buildCLI(['--config=/path/to/file']).flags.config).toBe('/path/to/file');
+	});
+
+	it('flags.configBasedir', () => {
+		expect(buildCLI(['--config-basedir=/path/to/dir']).flags.configBasedir).toBe('/path/to/dir');
+	});
+
+	it('flags.customFormatter', () => {
+		expect(buildCLI(['--custom-formatter=foo']).flags.customFormatter).toBe('foo');
+	});
+
+	it('flags.customSyntax', () => {
+		expect(buildCLI(['--custom-syntax=foo']).flags.customSyntax).toBe('foo');
+	});
+
+	it('flags.disableDefaultIgnores', () => {
+		expect(buildCLI(['--disable-default-ignores']).flags.disableDefaultIgnores).toBe(true);
+		expect(buildCLI(['--di']).flags.disableDefaultIgnores).toBe(true);
+	});
+
+	it('flags.fix', () => {
+		expect(buildCLI(['--fix']).flags.fix).toBe(true);
+	});
+
+	it('flags.formatter', () => {
+		expect(buildCLI(['--formatter=json']).flags.formatter).toBe('json');
+		expect(buildCLI(['-f', 'json']).flags.formatter).toBe('json');
+	});
+
+	it('flags.help', () => {
+		expect(buildCLI(['--help']).flags.help).toBe(true);
+		expect(buildCLI(['-h']).flags.help).toBe(true);
+	});
+
+	it('flags.ignoreDisables', () => {
+		expect(buildCLI(['--ignore-disables']).flags.ignoreDisables).toBe(true);
+		expect(buildCLI(['--id']).flags.ignoreDisables).toBe(true);
+	});
+
+	it('flags.ignorePath', () => {
+		expect(buildCLI(['--ignore-path=/path/to/file']).flags.ignorePath).toBe('/path/to/file');
+		expect(buildCLI(['-i', '/path/to/file']).flags.ignorePath).toBe('/path/to/file');
+	});
+
+	it('flags.ignorePattern', () => {
+		expect(buildCLI(['--ignore-pattern=vendor/**']).flags.ignorePattern).toBe('vendor/**');
+		expect(buildCLI(['--ip', 'vendor/**']).flags.ignorePattern).toBe('vendor/**');
+		expect(buildCLI(['--ip', 'vendor/**', '--ip', 'test/*.css']).flags.ignorePattern).toEqual([
+			'vendor/**',
+			'test/*.css',
+		]);
+	});
+
+	it('flags.maxWarnings', () => {
+		expect(buildCLI(['--max-warnings=7']).flags.maxWarnings).toBe(7);
+		expect(buildCLI(['--mw', '-1']).flags.maxWarnings).toBe(-1);
+	});
+
+	it('flags.outputFile', () => {
+		expect(buildCLI(['--output-file=/path/to/file']).flags.outputFile).toBe('/path/to/file');
+		expect(buildCLI(['-o', '/path/to/file']).flags.outputFile).toBe('/path/to/file');
+	});
+
+	it('flags.printConfig', () => {
+		expect(buildCLI(['--print-config']).flags.printConfig).toBe(true);
+	});
+
+	it('flags.quiet', () => {
+		expect(buildCLI(['--quiet']).flags.quiet).toBe(true);
+		expect(buildCLI(['-q']).flags.quiet).toBe(true);
+	});
+
+	it('flags.reportInvalidScopeDisables', () => {
+		expect(buildCLI(['--report-invalid-scope-disables']).flags.reportInvalidScopeDisables).toBe(
+			true,
+		);
+		expect(buildCLI(['--risd']).flags.reportInvalidScopeDisables).toBe(true);
+	});
+
+	it('flags.reportNeedlessDisables', () => {
+		expect(buildCLI(['--report-needless-disables']).flags.reportNeedlessDisables).toBe(true);
+		expect(buildCLI(['--rd']).flags.reportNeedlessDisables).toBe(true);
+	});
+
+	it('flags.stdinFilename', () => {
+		expect(buildCLI(['--stdin-filename=foo.css']).flags.stdinFilename).toBe('foo.css');
+	});
+
+	it('flags.syntax', () => {
+		expect(buildCLI(['--syntax=less']).flags.syntax).toBe('less');
+		expect(buildCLI(['-s', 'less']).flags.syntax).toBe('less');
+	});
+
+	it('flags.version', () => {
+		expect(buildCLI(['--version']).flags.version).toBe(true);
+		expect(buildCLI(['-v']).flags.version).toBe(true);
+	});
+});
diff --git a/lib/cli.js b/lib/cli.js
index 0825d450d0..20b8f4a571 100644
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -220,35 +220,32 @@ const meowOptions = {
         When glob pattern matches no files, the process will exit without throwing an error.
 	`,
 	flags: {
-		'allow-empty-input': {
+		allowEmptyInput: {
 			alias: 'aei',
 			type: 'boolean',
 		},
 		cache: {
 			type: 'boolean',
 		},
-		'cache-location': {
+		cacheLocation: {
 			type: 'string',
 		},
+		color: {
+			type: 'boolean',
+		},
 		config: {
 			type: 'string',
 		},
-		'config-basedir': {
+		configBasedir: {
 			type: 'string',
 		},
-		'print-config': {
-			type: 'boolean',
-		},
-		color: {
-			type: 'boolean',
-		},
-		'custom-formatter': {
+		customFormatter: {
 			type: 'string',
 		},
-		'custom-syntax': {
+		customSyntax: {
 			type: 'string',
 		},
-		'disable-default-ignores': {
+		disableDefaultIgnores: {
 			alias: 'di',
 			type: 'boolean',
 		},
@@ -264,44 +261,47 @@ const meowOptions = {
 			alias: 'h',
 			type: 'boolean',
 		},
-		'ignore-disables': {
+		ignoreDisables: {
 			alias: 'id',
 			type: 'boolean',
 		},
-		'ignore-path': {
+		ignorePath: {
 			alias: 'i',
+			type: 'string',
 		},
-		'ignore-pattern': {
+		ignorePattern: {
 			alias: 'ip',
+			type: 'string',
 		},
-		'no-color': {
-			type: 'boolean',
+		maxWarnings: {
+			alias: 'mw',
+			type: 'number',
 		},
-		'output-file': {
+		outputFile: {
 			alias: 'o',
 			type: 'string',
 		},
-		'report-needless-disables': {
-			alias: 'rd',
+		printConfig: {
 			type: 'boolean',
 		},
-		'report-invalid-scope-disables': {
+		quiet: {
+			alias: 'q',
+			type: 'boolean',
+		},
+		reportInvalidScopeDisables: {
 			alias: 'risd',
 			type: 'boolean',
 		},
-		'max-warnings': {
-			alias: 'mw',
+		reportNeedlessDisables: {
+			alias: 'rd',
+			type: 'boolean',
 		},
-		'stdin-filename': {
+		stdinFilename: {
 			type: 'string',
 		},
-		quiet: {
-			alias: 'q',
-			type: 'boolean',
-			default: false,
-		},
 		syntax: {
 			alias: 's',
+			type: 'string',
 		},
 		version: {
 			alias: 'v',
@@ -317,11 +317,7 @@ const meowOptions = {
  * @returns {Promise<any>}
  */
 module.exports = (argv) => {
-	meowOptions.argv = argv;
-	/** @type {CLIOptions} */
-	const cli =
-		// @ts-ignore TODO TYPES
-		meow(meowOptions);
+	const cli = buildCLI(argv);
 
 	const invalidOptionsMessage = checkInvalidCLIOptions(meowOptions.flags, cli.flags);
 
@@ -536,3 +532,14 @@ function handleError(err) {
 
 	process.exit(exitCode); // eslint-disable-line no-process-exit
 }
+
+/**
+ * @param {string[]} argv
+ * @returns {CLIOptions}
+ */
+function buildCLI(argv) {
+	// @ts-ignore TODO TYPES
+	return meow({ ...meowOptions, argv });
+}
+
+module.exports.buildCLI = buildCLI;
diff --git a/lib/utils/__tests__/checkInvalidCLIOptions.test.js b/lib/utils/__tests__/checkInvalidCLIOptions.test.js
index 5c1b281cf1..028b22a174 100644
--- a/lib/utils/__tests__/checkInvalidCLIOptions.test.js
+++ b/lib/utils/__tests__/checkInvalidCLIOptions.test.js
@@ -8,7 +8,7 @@ describe('checkInvalidCLIOptions', () => {
 	const allowedOptions = {
 		fix: {},
 		config: {},
-		'max-war': { alias: 'mw' },
+		maxWar: { alias: 'mw' },
 		quiet: { alias: 'q' },
 	};
 
diff --git a/lib/utils/checkInvalidCLIOptions.js b/lib/utils/checkInvalidCLIOptions.js
index 8f8b825f1f..b5b80e2233 100644
--- a/lib/utils/checkInvalidCLIOptions.js
+++ b/lib/utils/checkInvalidCLIOptions.js
@@ -75,8 +75,8 @@ module.exports = function checkInvalidCLIOptions(allowedOptions, inputOptions) {
 	const allOptions = buildAllowedOptions(allowedOptions);
 
 	return Object.keys(inputOptions)
-		.map((opt) => _.kebabCase(opt))
 		.filter((opt) => !allOptions.includes(opt))
+		.map(_.kebabCase)
 		.reduce((msg, invalid) => {
 			// NOTE: No suggestion for shortcut options because it's too difficult
 			const suggestion = invalid.length >= 2 ? suggest(allOptions, invalid) : null;