added Angular support

Author: DanielJDufour

proj4-fully-loaded.js

@@ -1,6 +1,11 @@
-const proj4 = require("proj4");
+let proj4 = require("proj4");
 const defs = require("proj4js-definitions");
 
+if (typeof proj4 === "object" && typeof proj4.defs !== "function" && typeof proj4.default === "function") {
+  // probably inside an Angular project
+  proj4 = proj4.default;
+}
+
 proj4.defs(defs);
 
 module.exports = proj4;