support empty strings for defaultMessage in intl.formatMessage

[lowell1]

Hi friends, I noticed if you put an empty string as the default message in formatMessage, it thinks there is no default message so it displays the id instead.

I don't really understand how format js works enough to fix it myself but i think i found the problem here

if (!msg.defaultMessage && !msg.id) {
return;
}

if (msg.defaultMessage) {
msg.defaultMessage = msg.defaultMessage.trim().replace(/\s+/gm, ' ');
}

maybe you could change it to something like

if(typeof msg.defaultMessage === "string")

here's the link to where i found this code

formatjs/packages/ts-transformer/src/transform.ts

Line 305 in 099fd8c

if (!msg.defaultMessage && !msg.id) {

p.s. i know you can also put a blank space for an empty message but i didn't know that at the time and it took me a while to figure it out so i think this might make it easier for other people that are new to formatjs

[longlho]

Why would you have empty defaultMessage?

[lowell1]

sometimes some things aren't translated for parts of the webpage and i think it would be a better user experience for the text to not show rather than show up as the message id

[longlho]

defaultMessage gets prioritized over id though, so it would show English in that case (if your defaultMessage is in English).