cli/extract: throw when encountering same id with different defaults

[vsnig]

I believe such situation is unexpected and we should warn (or better error) when encountering it.
Right now it saves last extracted defaults and discards all the others.

I didn't look how to better do this but let it be here for now so we can later discuss and implement this.

[tricoder42]

@lingui/babel-extract-messages` throws a syntax error when same message with different defaults is found in the same file, but maybe it's missed when messages are in different files?

[tricoder42]

Fixed in latest release v2.3.0.

[tkvw]

I think we should allow undefined; this would allow to enter the default message once and use the id only in other cases.
Given:

<Trans id="about">About</Trans>

and:

<Trans id="about"/>

throws :

Error: Encountered different defaults for message about
pages/about.js:8 About
pages/index.js:26 undefined

[tricoder42]

@tkvw The problem might be when message contains variables.

<Trans id="about">About {section}</Trans>

// becomes
<Trans id="about" defaults="About {section}" values={{ section }} />

// but we would have just
<Trans id="about" defaults="About {section}" />

so, yes, this should be possible, but you just have to pass values manually:

<Trans id="about" values={{ section }} />