kazupon/vue-i18n

[feature request] Have $te check for fallback locales

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#971 opened on Aug 12, 2020

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Status: ProposalType: Featurehelp wanted

Description

Suppose I have the following messages and fallback config:

messages: {
  en: {
    message: {
      hello: 'hello world',
      greeting: 'good morning'
    }
  }
},
fallbackLocale: 'en'

And with my current $i18n.locale set to "en-US", running $te will have the following output:

this.$te('hello') // => false

Would it be a bad idea to configure the default behavior of $te to take into account of the fallback locale setting?

So suppose I have the fallbackLocale set to ['es-EC', 'en'], and with $i18n.locale set to "fr", running

this.$te('hello')

should be equivalent to

(this.$te('hello', 'fr') ||
 this.$te('hello', 'es-EC') ||
 this.$te('hello', 'es') ||
 this.$te('hello', 'en'))

With that implemented, the current default behavior should still be reproduceable with this.$te('hello', this.$i18n.locale).

Contributor guide

Tech stack
vuejavascript
Domain
frontendinternationalization
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Vue.jsvue i18n basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Examine the $te method implementation in the vue i18n source code, likely in src/index.js or a related mixin file. Currently, it only checks the current locale for message existence. The change requires iterating through the fallback locale chain, respecting the fallbackLocale configuration. Ensure that passing an explicit locale argument still works and that the fallback logic only applies when no locale is given. After implementing, test with sample configurations like the one in the issue.