Add backquote support

[Kudo]

Version

• i18next: 10.0.7
• i18next-scanner: 2.1.2

Configuration

{ // i18next-scanner options
    defaultValue: '__STRING_NOT_TRANSLATED__',
    resource: {
      loadPath: 'i18n/{{lng}}/{{ns}}.json',
      savePath: 'i18n/{{lng}}/{{ns}}.json',
      jsonIndent: 2
    },
    nsSeparator: false,
    keySeparator: false
}

For multiline string, I sometimes use ES6 template strings and it seems i18next-scanner does not support backquote according to the test case.

My test case is:

i18next.t(`aString`);

or even further

i18next.t(`line1
  line2
  line3`);

Could you please help to add the backquote parsing support?
Thank you.

[cheton]

The assumption for using template literals is to embed expressions within a string, however, it's not possible for i18next-scanner to find the translation key using static analysis.

I can add support for matching back-tick (` `) character, but it would need user's help to specify an option like defaultKey, as either below:

• defaultKeys as an array of translation keys

i18next.t(`added ${something}`, {
    defaultKeys: [
        'added foo',
        'added bar'
    ]
});

• defaultKey as an object containing all the variables

i18next.t(`added ${something}`, {
    defaultKey: {
        'something': ['foo', 'bar']
    }
});

[Kudo]

The interpolation mechanism in i18next works well.
My case is just to use template strings for multiline strings and we don't need the replace the content.
I.e. I will do something like that from your case.

i18next.t(`added {{something}}
  and {{bar}}`, { something: 'foo', bar: 'bar' });

Well, adding this feature may confuse new user especially between the partial template strings support and interpolation.
Please consider and if there are any concerns just forget me and I will close this issue.

[cheton]

Sure. I will update the parser to support back-tick (` `) characters, just to let you know the translation key will have newline characters like below:

{
    "added {{something}}\n and {{bar}}": ""
}

[cheton]

Published i18next-scanner@2.1.3

[Kudo]

It works like a charm. Thank you so much for quick enhancement.