Parse file pipe fix (multiple files validation)

[mahkassem]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

The parse file validation pipe doesn't work if multiple files were passed.

Issue Number: N/A

What is the new behavior?

• ParseFilePipe will now handle multiple files validations where the IUploadValidatorOptions will be applied to each file.
• It still works with single file as it already was.

Does this PR introduce a breaking change?

• Yes
• No

Other information

I'm aware of the existing pull-request that introduces a similar solution, I tried to help with it but it seems to be abandoned, so I create this one to help ship this improvement quicker.

[coveralls]

Pull Request Test Coverage Report for Build 0bdc1286-e6fc-42e3-8026-8982426e0fcd

• 6 of 9 (66.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 93.364%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/common/pipes/file/parse-file.pipe.ts	6	9	66.67%

Totals
Change from base Build 0701e559-e0cf-4feb-9bad-f5fcb514c782:	-0.04%
Covered Lines:	6205
Relevant Lines:	6646

---

💛 - Coveralls

[kamilmysliwiec]

LGTM

[micalevisk]

note that this PR had introduced a regression because of the eager import of class-validator which is an optional package for @nestjs/common as long as you don't use few features -- fixed at 91f7190

We might clarify that on CONTRIBUTING.md

[mahkassem]

note that this PR had introduced a regression because of the eager import of class-validator which is an optional package for @nestjs/common as long as you don't use few features -- fixed at 91f7190

We might clarify that on CONTRIBUTING.md

Thank you, I will be careful with any future PRs