feat: add is-object-visible

src/is-object-visible/index.ts

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+export function isObjectVisible(id: string): boolean {
+	return Game.getObjectById(id) !== null;
+}

src/is-object-visible/package.json

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+{
+  "name": "@open-screeps/is-object-visible",
+  "version": "0.0.0-development",
+  "description": "Is the game object visible",
+  "main": "index.js",
+  "scripts": {
+    "lint": "tslint -p ./tsconfig.json",
+    "test": "tsc && nyc ava",
+    "prepare": "npm test",
+    "release": "semantic-release -e semantic-release-monorepo"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/postcrafter/open-screeps.git"
+  },
+  "files": [
+    "index.{d.ts,js,js.map}"
+  ],
+  "keywords": [
+    "screeps",
+    "open-screeps"
+  ],
+  "author": "Adam Laycock <adam@arcath.net>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/postcrafter/open-screeps/issues"
+  },
+  "homepage": "https://github.com/postcrafter/open-screeps/src/is-object-visible#readme",
+  "dependencies": {
+    "@types/screeps": "^0.0.0"
+  },
+  "devDependencies": {
+    "ava": "^0.24.0",
+    "condition-circle": "^2.0.1",
+    "nyc": "^11.3.0",
+    "semantic-release": "^11.0.2",
+    "semantic-release-monorepo": "^4.0.0",
+    "tslint": "^5.9.1",
+    "tslint-config-airbnb": "^5.4.2",
+    "typescript": "^2.6.2"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "release": {
+    "verifyConditions": "condition-circle"
+  }
+}

src/is-object-visible/readme.md

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+# is-object-visible
+> Is the game object visible
+
+## Install
+```sh
+$ npm install @open-screeps/is-object-visible
+```
+
+## Usage
+```typescript
+import { isObjectVisible } from '@open-screeps/is-object-visible';
+
+if(isObjectVisible('someid')){
+  const source = Game.getObjectById<Source>('someid')
+}
+```
+
+## Related
+- [is-room-visible](https://github.com/PostCrafter/open-screeps/tree/master/src/is-room-visible)
+
+## License
+[MIT](../../license.md)

src/is-object-visible/test.ts

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+import ava from 'ava';
+
+import { isObjectVisible } from './index';
+
+declare const global: any;
+
+function stubGame() {
+	const objects: {[id: string]: {} | null} = {
+		foo: {},
+		bar: null,
+	};
+
+	global.Game = {
+		getObjectById: (id: string) => {
+			return objects[id];
+		},
+	};
+}
+
+ava('Should return the right values', (t) => {
+	stubGame();
+
+	t.true(isObjectVisible('foo'));
+	t.false(isObjectVisible('bar'));
+});

src/is-object-visible/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json"
+}