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eslint-plugin-i18next

ESLint plugin for i18n

Installation

npm install eslint-plugin-i18next --save-dev

Usage

Add i18next to the plugins section of your .eslintrc configuration file.

{
  "plugins": ["i18next"]
}

Then configure the rules you want to use under the rules section.

{
  "rules": {
    "i18next/no-literal-string": 2
  }
}

or

{
  "extends": ["plugin:i18next/recommended"]
}

Rule no-literal-string

This rule aims to avoid developers to display literal string to users in those projects which need to support multi-language.

Note: Disable auto-fix because key in the call i18next.t(key) ussally was not the same as the literal

Rule Details

It will find out all literal strings and validate them.

Examples of incorrect code for this rule:

/*eslint i18next/no-literal-string: "error"*/
const a = 'foo';

Examples of correct code for this rule:

/*eslint i18next/no-literal-string: "error"*/
// safe to assign string to const variables whose name are UPPER_CASE
var FOO = 'foo';

// UPPER_CASE properties are valid no matter if they are computed or not
var a = {
  BAR: 'bar',
  [FOO]: 'foo'
};

// also safe to use strings themselves are UPPCASE_CASE
var foo = 'FOO';

i18n

This rule allows to call i18next translate function.

Correct code:

/*eslint i18next/no-literal-string: "error"*/
var bar = i18next.t('bar');
var bar2 = i18n.t('bar');

Maybe you use other internationalization libraries not i18next. You can use like this:

/*eslint i18next/no-literal-string: ["error", { "ignoreCallee": ["yourI18n"] }]*/
const bar = yourI18n('bar');

// or

/*eslint i18next/no-literal-string: ["error", { "ignoreCallee": ["yourI18n.method"] }]*/
const bar = yourI18n.method('bar');

HTML Markup

All literal strings in html template are typically mistakes. For JSX example:

<div>foo</div>

They should be translated by i18next translation api:

<div>{i18next.t('foo')}</div>

Same for Vue template:

<!-- incorrect -->
<template>
  foo
</template>

<!-- correct -->
<template>
  {{ i18next.t('foo') }}
</template>

It would allow most reasonable usages of string that would rarely be shown to user, like following examples.

Click on them to see details.

react-i18next

This plugin are compatible with react-i18next

// correct
<Trans>
  <span>bar</span>
</Trans>
Redux/Vuex

This rule also works with those state managers like Redux and Vuex.

Correct code:

var bar = store.dispatch('bar');
var bar2 = store.commit('bar');
Typescript

This plugin would not complain on those reasonable usages of string.

The following cases are considered as correct:

var a: Type['member'];
var a: Omit<T, 'key'>;
enum E {
  A = 1
}
var a = E['A'];
var a: { t: 'button' } = { t: 'button' };
var a: 'abc' | 'name' = 'abc';

We require type information to work properly, so you need to add some options in your .eslintrc:

  "parserOptions": {
    // path of your tsconfig.json
    "project": "./tsconfig.json"
  }

See here for more deteils.

Import/Export

The following cases are allowed:

import mod from 'm';
import('mod');
require('mod');

export { named } from 'm';
export * from 'm';
String Comparison

String comparison is fine.

// correct
name === 'Android' || name === 'iOS';
SwithCase

Skip switchcase statement:

// correct
switch (type) {
  case 'foo':
    break;
  case 'bar':
    break;
}

Options

markupOnly

If markupOnly option turn on, only JSX text and strings used as JSX attributes will be validated.

JSX text:

// incorrect
<div>hello world</div>
<div>{"hello world"}</div>

Strings as JSX attribute:

// incorrect
<div foo="foo"></div>
<div foo={"foo"}></div>

onlyAttribute

Only check the JSX attributes that listed in this option. This option would turn on markupOnly.

// correct
const foo = 'bar';
<div foo="foo"></div>

// incorrect
<div>foo</div>

/*eslint i18next/no-literal-string: ["error", {"onlyAttribute": ["foo"]}]*/
// incorrect
<div foo="foo"></div>

ignore

The ignore option specifies exceptions not to check for literal strings that match one of regexp paterns.

Examples of correct code for the { "ignore": ['foo'] } option:

/*eslint i18next/no-literal-string: ["error", {"ignore": ["foo"]}]*/
const a = 'afoo';

ignoreCallee

THe ignoreCallee option speficies exceptions not check for function calls whose names match one of regexp patterns.

Examples of correct code for the { "ignoreCallee": ["foo"] } option:

/*eslint i18next/no-literal-string: ["error", { "ignoreCallee": ["foo"] }]*/
const bar = foo('bar');

ignoreAttribute

The ignoreAttribute option specifies exceptions not to check for JSX attributes that match one of ignored attributes.

Examples of correct code for the { "ignoreAttribute": ["foo"] } option:

/*eslint i18next/no-literal-string: ["error", { "ignoreAttribute": ["foo"] }]*/
const element = <div foo="bar" />;

ignoreProperty

The ignoreProperty option specifies exceptions not to check for object properties that match one of ignored properties.

Examples of correct code for the { "ignoreProperty": ["foo"] } option:

/*eslint i18next/no-literal-string: ["error", { "ignoreProperty": ["foo"] }]*/
const a = { foo: 'bar' };

ignoreComponent

The ignoreComponent option specifies exceptions not to check for string literals inside a list of named components. It includes <Trans> per default.

Examples of correct code for the { "ignoreComponent": ["Icon"] } option:

/*eslint i18next/no-literal-string: ["error", { "ignoreComponent": ["Icon"] }]*/
<Icon>arrow<Icon/>

validateTemplate

Indicate whether to validate template strings or not. Default false

/*eslint i18next/no-literal-string: ["error", { "validateTemplate": true }]*/
// incorrect
var foo = `hello world`;

About

ESLint plugin for i18next. Prevent to display non-localized text for users

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