Add basic support for TypeRef in decode.js

For now it decodes into an Immutable.Map

js/src/decode.js

@@ -81,6 +81,35 @@ function decodeSet(input, ref, getChunk) {
 }
 
 function decodeType(input, ref, getChunk) {
+  return new Ref(ref, () => {
+    // We always have a kind an a name.
+    let p = decodeValue(input.name, ref, getChunk).then(name => {
+      return decodeValue(input.kind, ref, getChunk).then(kind => {
+        return {name, kind};
+      });
+    });
+
+    // Package is not yet implemented. Just use null for now.
+    if (input.pkgRef) {
+      throw new Error('Not implemented')
+    } else {
+      p = p.then(({name, kind}) => ({name, kind, pkg: null}));
+    }
+
+    // If desc is present it is a list
+    p = p.then(({name, kind, pkg}) => {
+      if (!input.desc) {
+        return {name, kind, pkg, desc: null};
+      }
+      return decodeValue(input.desc, ref, getChunk).deref().then(desc => {
+        return {name, kind, pkg, desc};
+      });
+    });
+
+    return p.then(obj => {
+      return Immutable.Map(obj);
+    });
+  });
 }
 
 function decodeCompoundBlob(value, ref, getChunk) {

js/test/decode.js

@@ -84,6 +84,32 @@ suite('decode.js', function() {
     assert.isTrue(Immutable.List.of(true, false).equals(value));
   });
 
+  testCompound('type', 'j {"type":{"kind":{"uint8":0},"name":""}}', value => {
+    assert.isTrue(Immutable.Map.isMap(value));
+    assert.equal(value.get('kind'), 0);
+    assert.equal(value.get('name'), '');
+  });
+
+  testCompound('type with desc', 'j {"type":{"kind":{"uint8":14},"name":"T","desc":{"list":[{"ref":"sha1-list"},{"ref":"sha1-map"}]}}}', value => {
+    assert.isTrue(Immutable.Map.isMap(value));
+    assert.equal(value.get('kind'), 14);
+    assert.equal(value.get('name'), 'T');
+    assert.isTrue(Immutable.List.isList(value.get('desc')));
+    assert.equal(2, value.get('desc').size);
+    assert.isTrue(Ref.isRef(value.get('desc').get(0)));
+    assert.isTrue(Ref.isRef(value.get('desc').get(1)));
+  });
+
+testCompound('type enum', 'j {"type":{"desc":{"list":["f","g"]},"kind":{"uint8":18},"name":"enum"}}', value => {
+  assert.isTrue(Immutable.Map.isMap(value));
+  assert.equal(value.get('kind'), 18);
+  assert.equal(value.get('name'), 'enum');
+  assert.isTrue(Immutable.List.isList(value.get('desc')));
+  assert.equal(2, value.get('desc').size);
+  assert.equal('f', value.get('desc').get(0));
+  assert.equal('g', value.get('desc').get(1));
+});
+
   test('blob', done => {
     let data = 'b abc';
     let ref = 'sha1-c0ffee';