InversifyJS Use default class property for @optional injected properties

Description

Currently the @optional tag overrides class properties defined with typescript-style default values:

@injectable()
class Ninja {
    @inject(Weapon) @optional() weapon: Weapon = new Katana();

    ....
}

this currently sets the weapon property to undefined if no Weapon is present in the container. My proposed change allows does not override the default and results in the weapon property being set to new Katana().

(Default values in the constructor already work, but I would prefer not to add boilerplate constructors if this solution is possible.)

Motivation and Context

How Has This Been Tested?

By copying the test case for optional constructor injection but moving the injection to property injection and then running npm test

Types of changes

[x] Updated docs / Refactor code / Added a tests case (non-breaking change)
[ ] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

[x] My code follows the code style of this project.
[x] My change requires a change to the documentation.
[x] I have updated the documentation accordingly.
[x] I have read the CONTRIBUTING document.
[x] I have added tests to cover my changes.
[x] All new and existing tests passed.
[x] I have updated the changelog.

Jun 23 '22 06:06 haaijman-imagem

Codecov Report

Merging #1467 (56055bf) into master (758a6bd) will increase coverage by 0.05%. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master    #1467      +/-   ##
==========================================
+ Coverage   99.56%   99.61%   +0.05%     
==========================================
  Files          53       53              
  Lines        1364     1568     +204     
  Branches      196      206      +10     
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+ Hits         1358     1562     +204     
  Partials        6        6