Fix JavaScript dependencies in bundles. (#4215)

Fixes #4602

We turned off `allowJs` by default, to keep the compiler from grabbing
a bunch of files that it wouldn't actually do anything useful with.  On
the other hand, this caused problems with bundles, where the compiler
needs to gather all the dependencies, including JavaScript ones.  This
fixes this so that when we are bundling, we analyse JavaScript imports
in the compiler.

1 files changed, 9 insertions, 0 deletions

diff --git a/cli/js/compiler_api_test.ts b/cli/js/compiler_api_test.ts
index 64ba70afb..fcca0a22b 100644
--- a/cli/js/compiler_api_test.ts
+++ b/cli/js/compiler_api_test.ts
@@ -135,6 +135,15 @@ test(async function bundleApiConfig() {
   assert(!actual.includes(`random`));
 });
 
+test(async function bundleApiJsModules() {
+  const [diagnostics, actual] = await bundle("/foo.js", {
+    "/foo.js": `export * from "./bar.js";\n`,
+    "/bar.js": `export const bar = "bar";\n`
+  });
+  assert(diagnostics == null);
+  assert(actual.includes(`System.register("bar",`));
+});
+
 test(async function diagnosticsTest() {
   const [diagnostics] = await compile("/foo.ts", {
     "/foo.ts": `document.getElementById("foo");`