refactor: Defaults

packages/physics/package.json

@@ -33,6 +33,7 @@
     "deepmerge": "^4.2.2",
     "immutable": "^4.0.0-rc.12",
     "kefir": "^3.8.8",
+    "lodash.get": "^4.4.2",
     "matter-js": "0.14.2",
     "poly-decomp": "0.3.0",
     "proton-engine": "^4.2.1"

packages/physics/src/traits/emitter.js

@@ -3,6 +3,7 @@ import {Ticker} from '@avocado/timing';
 import {Trait} from '@avocado/traits';
 import {compose} from '@latus/core';
 import merge from 'deepmerge';
+import get from 'lodash.get';
 import K from 'kefir';
 
 import Proton from '../proton';
@@ -93,6 +94,7 @@ export default (latus) => class Emitter extends decorate(Trait) {
 
   async emitParticleJson(json) {
     const {Entity} = latus.get('%resources');
+    const isListed = get(json, 'traits.Emitted.params.listed', true);
     return this.entity.emitParticleEntity(
       await Entity.load(
         merge(
@@ -100,6 +102,7 @@ export default (latus) => class Emitter extends decorate(Trait) {
             traits: {
               Positioned: {},
               Visible: {},
+              ...(isListed ? {Listed: {}} : {}),
             },
           },
           json,