Fix isMultiple not handling multi-word flags (#150)

index.js

@@ -2,6 +2,7 @@
 const path = require('path');
 const buildParserOptions = require('minimist-options');
 const yargs = require('yargs-parser');
+const camelCase = require('camelcase');
 const camelcaseKeys = require('camelcase-keys');
 const decamelizeKeys = require('decamelize-keys');
 const trimNewlines = require('trim-newlines');
@@ -83,7 +84,7 @@ Convert to alternative syntax for coercing values to expected type, according to
 const convertToTypedArrayOption = (arrayOption, flags) =>
 	arrify(arrayOption).map(flagKey => ({
 		key: flagKey,
-		[flags[flagKey].type || 'string']: true
+		[flags[camelCase(flagKey, '-')].type || 'string']: true
 	}));
 
 const validateFlags = (flags, options) => {

package.json

@@ -42,6 +42,7 @@
 	"dependencies": {
 		"@types/minimist": "^1.2.0",
 		"arrify": "^2.0.1",
+		"camelcase": "^6.0.0",
 		"camelcase-keys": "^6.2.2",
 		"decamelize-keys": "^1.1.0",
 		"hard-rejection": "^2.1.0",

test/test.js

@@ -482,6 +482,21 @@ test('isMultiple - multiple flag default values', t => {
 	});
 });
 
+// Happened in production 2020-05-10: https://github.com/sindresorhus/meow/pull/143#issuecomment-626287226
+test('isMultiple - handles multi-word flag name', t => {
+	t.deepEqual(meow({
+		argv: ['--foo-bar=baz'],
+		flags: {
+			fooBar: {
+				type: 'string',
+				isMultiple: true
+			}
+		}
+	}).flags, {
+		fooBar: ['baz']
+	});
+});
+
 if (NODE_MAJOR_VERSION >= 14) {
 	test('supports es modules', async t => {
 		try {