fileWriteStreamHandler accept promise which will resolve to writeable stream

[dcvice1967]

Support plan

• which support plan is this issue covered by? (e.g. Community, Sponsor, or Enterprise): Community
• is this issue currently blocking your project? (yes/no): yes
• is this issue affecting a production system? (yes/no): yes

Context

• node version: v16.7.0
• module (formidable) version: "formidable": "^2.0.1",
• environment (e.g. node, browser, native, OS): node application
• used with (i.e. popular names of modules): express, oracledb
• any other relevant information:

What problem are you trying to solve?

We need to store file contents from the form data in a blob in the oracle database. When the fileWriteStreamHandler is called, we need to open a db connection and request a blob handle. This handle is wrapped as a writable stream. Since these calls return promises, we need to have the fileWriteStreamHandler support receiving a promise which will resolve to the writeable stream. Currently this does not seem to be supported.

Do you have a new or modified API suggestion to solve the problem?

Either add a new property for promised based callback or update the existing one to check if the result is a promise and handle accordingly.

[GrosSacASac]

Can you try to convert the promise into a stream ? With this library https://github.com/GrosSacASac/stream-sac/blob/main/source/concatAsStream.js

const stream = concatAsStream([promise]);