Implement syntax check for javascript

Also added some examples to test that a syntax error does trigger an
COMPILER-ERROR. This does also require another extension as we can't
load modules with the normal extension without a package.json file.

Author: vmcj

example_problems/hello/submissions/accepted/multifile-js-2/hello.js

@@ -0,0 +1,7 @@
+// This should give CORRECT on the default problem 'hello'.
+// It does include another file for the actual implementation
+//
+// @EXPECTED_RESULTS@: CORRECT
+
+import { hello } from './module.js';
+console.log(hello());

example_problems/hello/submissions/accepted/multifile-js-2/module.js

@@ -0,0 +1,4 @@
+// Extra included file with JS code
+export function hello() {
+    return "Hello world!";
+}

example_problems/hello/submissions/accepted/multifile-js-2/package.json

@@ -0,0 +1 @@
+{"type": "module"}

example_problems/hello/submissions/accepted/multifile-js/main.mjs

@@ -0,0 +1,7 @@
+// This should give CORRECT on the default problem 'hello'.
+// It does include another file for the actual implementation
+//
+// @EXPECTED_RESULTS@: CORRECT
+
+import { hello } from './module.mjs';
+console.log(hello());

example_problems/hello/submissions/accepted/multifile-js/module.mjs

@@ -0,0 +1,4 @@
+// Extra included file with JS code
+export function hello() {
+    return "Hello world!";
+}

example_problems/hello/submissions/compiler_error/multifile-js-2/hello.js

@@ -0,0 +1,7 @@
+// This should give COMPILER-ERROR on the default problem 'hello'.
+// The console.log is missing a `)`.
+//
+// @EXPECTED_RESULTS@: COMPILER-ERROR
+
+import { hello } from './module.js';
+console.log(hello();

example_problems/hello/submissions/compiler_error/multifile-js-2/module.js

@@ -0,0 +1,4 @@
+// Extra included file with JS code
+export function hello() {
+    return "Hello world!";
+}

example_problems/hello/submissions/compiler_error/multifile-js-2/package.json

@@ -0,0 +1 @@
+{"type": "module"}

example_problems/hello/submissions/compiler_error/multifile-js-3/hello.js

@@ -0,0 +1,9 @@
+// This should give CORRECT on the default problem 'hello'.
+// The submission includes another file with invalid syntax
+// which is never used. As we check all files for syntax we
+// also check the unused but invalid other file resulting in
+// the (unneeded) error.
+//
+// @EXPECTED_RESULTS@: COMPILER-ERROR
+
+console.log("Hello world!");

example_problems/hello/submissions/compiler_error/multifile-js-3/module.js

@@ -0,0 +1,6 @@
+// Extra included file with (invalid) JS code.
+// Invalid syntax on import instead of export.
+// The file itself is never used in the submission.
+import function hello() {
+    return "Hello world!"
+}