Enable features in libwabt.js by default (#2109)

This applies the same defaults for features in the JavaScript-compiled
version as the native tools. Without this change, enabling only the
"reference_types" feature did not work, as it got turned off due to
the dependency on "bulk_memory", which is counter-intuitive (see
Features::UpdateDependencies()).

Additionally, exposes all the features and their default setting in
JavaScript.

1 files changed, 3 insertions, 16 deletions

diff --git a/docs/demo/wat2wasm/demo.js b/docs/demo/wat2wasm/demo.js
index 66f44736..a5b7eb09 100644
--- a/docs/demo/wat2wasm/demo.js
+++ b/docs/demo/wat2wasm/demo.js
@@ -24,19 +24,6 @@ var features = {};
 
 WabtModule().then(function(wabt) {
 
-var FEATURES = [
-  'exceptions',
-  'mutable_globals',
-  'sat_float_to_int',
-  'sign_extension',
-  'simd',
-  'threads',
-  'multi_value',
-  'tail_call',
-  'bulk_memory',
-  'reference_types',
-];
-
 var kCompileMinMS = 100;
 var outputShowBase64 = false;
 var outputLog;
@@ -52,9 +39,9 @@ var base64El = document.getElementById('base64');
 var binaryBuffer = null;
 var binaryBlobUrl = null;
 
-for (var feature of FEATURES) {
-  var featureEl = document.getElementById(feature);
-  features[feature] = featureEl.checked;
+for (const [f, v] of Object.entries(wabt.FEATURES)) {
+  var featureEl = document.getElementById(f);
+  featureEl.checked = v;
   featureEl.addEventListener('change', event => {
     var feature = event.target.id;
     features[feature] = event.target.checked;