Code QuizAdvanced

Wrong design:type Key String

A misspelled metadata key returns undefined instead of the property type.

Codetypescript

import "reflect-metadata";
// experimentalDecorators + emitDecoratorMetadata enabled

function track(target: any, key: string) {
  const type = Reflect.getMetadata("design:types", target, key);
  console.log(type.name); // TypeError: Cannot read properties of undefined
}

class Product {
  @track
  price: number;
}

Why does reading the property's type fail?

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