Add BinaryenAddCustomSection API (#2381)

This adds a new BinaryenAddCustomSection API so a generator can add arbitrary
custom sections to a module.

1 files changed, 11 insertions, 0 deletions

diff --git a/test/binaryen.js/custom-section.js b/test/binaryen.js/custom-section.js
new file mode 100644
index 000000000..f61af0096
--- /dev/null
+++ b/test/binaryen.js/custom-section.js
@@ -0,0 +1,11 @@
+function assert(x) {
+  if (!x) throw 'error!';
+}
+
+Binaryen.setAPITracing(true);
+var module = new Binaryen.Module();
+
+module.addCustomSection("hello", [119, 111, 114, 108, 100]);
+
+assert(module.validate());
+console.log(module.emitText());