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When `emitDecoratorMetadata` compiler option is set to true in `tsconfig.json`, TypeScript generates some calls to `__metadata` function. By default in our NativeScript TypeScript projects the `noEmitHelpers` option is set to true, so TypeScript compiler does not generate the `__metadata` function. So the application crashes at runtime. Add the missing method, so we can have both `noEmitHelpers` and `emitDecoratorMetadata` set to true in `tsconfig.json`.
Globals module for defining functions part of the global context - you need only to call require for this module and all globals will be registered. For example:
require("globals");
setTimeout(function(){ console.log("Test"); }, 2000);
Global functions/objects are: setTimeout, clearTimeout, setInterval, clearInterval and console.