"design:type" return undefined if types are defined out of order

[abdullah2993]

Bug Report

Decorator metadata is not stored properly if type are not defined in right order.

import 'reflect-metadata';

function field(target: Object, propertyName: string) {}
export class C {}

export class A {
  @field
  public bb: B;

  @field
  public cc: C;

  @field
  public xx: boolean;
}

export class B {
  @field
  public aa: A;
}

console.log(Reflect.getOwnMetadata('design:type', A.prototype, 'bb')); // Return undefined expected B
console.log(Reflect.getOwnMetadata('design:type', A.prototype, 'cc'));
console.log(Reflect.getOwnMetadata('design:type', A.prototype, 'xx'));

[MartinJohns]

Related / Duplicate: #27519

[abdullah2993]

This is related to #27519 but you can reproduce it without circular dependency

import 'reflect-metadata';

function field(target: Object, propertyName: string) {}

export class A {
  @field
  public bb: B;
}

export class B {}

console.log(Reflect.getOwnMetadata('design:type', A.prototype, 'bb')); // Return undefined expected B

[MartinJohns]

The issue is the same: B is not declared yet when it's being used. Please read the comments in the linked issue.

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.