failing tests and partial fix for #31

Author: Rich-Harris

src/index.ts

@@ -206,6 +206,10 @@ export function x(strings: TemplateStringsArray, ...values: any[]): Expression {
 
 	try {
 		const expression = acorn.parseExpressionAt(str, 0, acorn_opts(comments, str)) as Expression;
+		const match = /\S+/.exec(str.slice((expression as any).end));
+		if (match) {
+			throw new Error(`Unexpected token '${match[0]}'`);
+		}
 
 		inject(str, expression, values, comments);
 

test/samples/arrow-function-parenthesized/expected.js

@@ -0,0 +1 @@
+foo || (bar => bar);

test/samples/arrow-function-parenthesized/input.js

@@ -0,0 +1 @@
+module.exports = ({ b, x }) => b`foo || ${x`bar => bar`}`;

test/test.ts

@@ -398,6 +398,12 @@ describe('codered', () => {
 				mappings: 'YASK,EAAE'
 			});
 		});
+
+		it('errors on invalid expressions', () => {
+			assert.throws(() => {
+				x`this is broken`;
+			}, /Unexpected token 'is'/);
+		});
 	});
 
 	describe('p', () => {