feat(platform) multer support for fastify platform

[gperdomor]

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
[x] 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?

File upload using Multer is only supported for express adapter
Issue Number: N/A

What is the new behavior?

Add fastify-multer support in @nestjs/platform-fastify.

Does this PR introduce a breaking change?

[] Yes
[x] No

Other information

[coveralls]

Pull Request Test Coverage Report for Build 2603

• 66 of 68 (97.06%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 93.57%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/platform-fastify/multer/interceptors/file-fields.interceptor.ts	14	16	87.5%

Totals
Change from base Build 2599:	0.04%
Covered Lines:	3155
Relevant Lines:	3314

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 2578

• 18 of 18 (100.0%) changed or added relevant lines in 8 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.07%) to 93.458%

---

Totals
Change from base Build 2574:	-0.07%
Covered Lines:	3090
Relevant Lines:	3247

---

💛 - Coveralls

[gperdomor]

@kamilmysliwiec WDYT? 😄

[kamilmysliwiec]

Thanks for the contribution. A few things:

• the original multer support (for express) is located in the @nestjs/platform-express package. Hence, we shouldn't create another lib but rather put it inside the @nestjs/platform-fastify instead of introducing breaking changes
• fastify-multer is a too young library for now, we cannot recommend using it yet

[gperdomor]

@kamilmysliwiec updated, Multer package was removed and the files related interceptors was copied to platform-fastify. Please consider a common @nestjs/multer package to avoid code duplication in Nest 7

[gperdomor]

please let me know if you are ok with the new version to proceed to update the docs

[kamilmysliwiec]

Thank you for your contribution @gperdomor. We have to postpone merging though because as I said:

fastify-multer is a too young library for now, we cannot recommend using it yet

Anyway, feel free to move forward with the docs. Once the library gets more mature, we'll surely make use of it.

[gperdomor]

@kamilmysliwiec docs updated :D

[podzz]

@kamilmysliwiec How long do you think this will take to merge this PR to master?

I am using @nestjs/platform-fastify and FileUpload in my project. In the meantime, is there a way to integrate this PR to @nestjs/platform-fastify dependency?

[zuohuadong]

@kamilmysliwiec @gperdomor
Any progress?

[ap-gorkun]

@kamilmysliwiec @gperdomor
fastify-multer has aged one year since the date of this PR. WDYT now? 😄

[mubasshir]

@kamilmysliwiec any update on it? we are missing out on performance due to this small part

[gperdomor]

Thanks to everyone for for the interest in this PR, I will close this in favor of #4921 which basically is an updated version of this one