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x/momentum/di/decorators/optional.ts

Momentum is an open-source framework for building server-side Deno applications in TypeScript. It provides the paradigms and design patterns to guide developers to create robust, scalable, and enterprise-grade applications.
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import { DiContainer, Type } from "../di-container.ts";
/** * Decorator use to mark an injected type as optional. If the type is not able to be resolved, the argument will be undefined */export function Optional(): PropertyDecorator & ParameterDecorator {  return function (    // deno-lint-ignore ban-types    target: Object,    propName?: string | symbol,    paramIndex?: number,  ) {    if (propName) {      DiContainer.root().registerProperty(        target.constructor as Type,        propName.toString(),        { isOptional: true },      );    }    if (paramIndex || paramIndex === 0) {      DiContainer.root().registerCtorParam(target as Type, paramIndex, {        isOptional: true,      });    }  };}