Fix filename option

Author: TooTallNate

src/index.ts

@@ -3,7 +3,7 @@ import { generate } from 'escodegen';
 import { parseScript } from 'esprima';
 import { visit, namedTypes as n, builders as b } from 'ast-types';
 import { Context, RunningScriptOptions } from 'vm';
-import { VM } from 'vm2';
+import { VM, VMScript } from 'vm2';
 
 /**
  * Compiles sync JavaScript code into JavaScript with async Functions.
@@ -138,7 +138,10 @@ namespace degenerator {
 	): (...args: A) => Promise<R> {
 		const compiled = degenerator(code, names);
 		const vm = new VM(options);
-		const fn = vm.run(`${compiled};${returnName}`);
+		const script = new VMScript(`${compiled};${returnName}`, {
+			filename: options.filename,
+		});
+		const fn = vm.run(script);
 		if (typeof fn !== 'function') {
 			throw new Error(
 				`Expected a "function" to be returned for \`${returnName}\`, but got "${typeof fn}"`

test/test.ts

@@ -159,26 +159,42 @@ describe('degenerator()', () => {
 				assert.equal(val, 'foo');
 			});
 		});
-		it('should prevent privilege escalation of untrusted code', async() => {
+		it('should prevent privilege escalation of untrusted code', async () => {
 			let err;
 			try {
 				const fn = compile<typeof process>(
 					`const f = this.constructor.constructor('return process');`,
 					'f',
-					[],
+					[]
 				);
 				await fn();
-			} catch(_err) {
+			} catch (_err) {
 				err = _err;
 			}
-			assert.equal(err.message,'process is not defined')
+			assert.equal(err.message, 'process is not defined');
 		});
 		it('should allow to return synchronous undefined', () => {
 			function u() {}
 			const fn = compile(`${u}`, 'u', ['']);
-			return fn().then(val => {
+			return fn().then((val) => {
 				assert.strictEqual(val, undefined);
 			});
 		});
+		it('should support "filename" option', async () => {
+			function u() {
+				throw new Error('fail');
+			}
+			let err;
+			const fn = compile(`${u}`, 'u', [''], {
+				filename: '/foo/bar/baz.js',
+			});
+			try {
+				await fn();
+			} catch (_err) {
+				err = _err;
+			}
+			assert.strictEqual(err.message, 'fail');
+			assert(err.stack.includes('at u (/foo/bar/baz.js:'));
+		});
 	});
 });