Add initial version of the plugin API helper

Author: MunGell

.eslintrc

@@ -0,0 +1,23 @@
+{
+    "root": true,
+    "parser": "@typescript-eslint/parser",
+    "env": { "node": true },
+    "plugins": [
+        "@typescript-eslint"
+    ],
+    "extends": [
+        "eslint:recommended",
+        "plugin:@typescript-eslint/eslint-recommended",
+        "plugin:@typescript-eslint/recommended"
+    ],
+    "parserOptions": {
+        "sourceType": "module"
+    },
+    "rules": {
+        "no-unused-vars": "off",
+        "@typescript-eslint/no-unused-vars": ["error", { "args": "none" }],
+        "@typescript-eslint/ban-ts-comment": "off",
+        "no-prototype-builtins": "off",
+        "@typescript-eslint/no-empty-function": "off"
+    }
+}

.gitignore

@@ -0,0 +1 @@
+node_modules

index.ts

@@ -0,0 +1,17 @@
+import {Plugin} from 'obsidian';
+
+declare global {
+    interface Window {
+        ['PluginApi']?: any
+    }
+}
+
+export function registerAPI(name: string, api: any, plugin: Plugin) {
+    window['PluginApi'] = window['PluginApi'] || {};
+
+    window['PluginApi'][name] = api;
+
+    plugin.register(() => {
+        delete window['PluginApi'][name];
+    });
+}