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add type interference to plainToClass / plainToInstance #1451

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Description

Adds type-safe object literals to plainToClass / plainToInstance.

Untested but made this proof of concept.

declare function plainToClass<T>(cls: ClassConstructor<T>, plain: T): T;

class Foo {
    name: string = 'Hello';
}

const foo = plainToClass(Foo, {
    name: 'Bar',
    invalid: 'propName',
})

Checklist

  • the pull request title describes what this PR does (not a vague title like Update index.md)
  • the pull request targets the default branch of the repository (develop)
  • the code follows the established code style of the repository
    • npm run prettier:check passes
    • npm run lint:check passes
  • tests are added for the changes I made (if any source code was modified)
  • documentation added or updated
  • I have run the project locally and verified that there are no errors

Fixes

Fixes #503

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feature: Support type-safe object literals in plainToClass
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