feat: legacy typings (#44)

* update core/context

* feat: define legacy typings

src/core/context.ts

@@ -260,7 +260,10 @@ function appendBlockToChain(
 ): unknown {
   let follow: unknown = true
   for (let i = 0; i < block.length && isBoolean(follow); i++) {
-    follow = appendLocaleToChain(chain, block[i], blocks)
+    const locale = block[i]
+    if (isString(locale)) {
+      follow = appendLocaleToChain(chain, block[i], blocks)
+    }
   }
   return follow
 }

src/index.ts

@@ -23,7 +23,12 @@ export {
   PostTranslationHandler
 } from './core'
 export * from './core/types'
-export { MissingHandler, ComposerOptions, Composer } from './composer'
+export {
+  MissingHandler,
+  ComposerOptions,
+  Composer,
+  CustomBlocks
+} from './composer'
 export {
   TranslateResult,
   Choice,

src/mixin.ts

@@ -1,7 +1,7 @@
 import { ComponentOptions, getCurrentInstance } from 'vue'
 import { Path } from './path'
 import { Locale } from './core/context'
-import { Composer, ComposerInternalOptions } from './composer'
+import { Composer, ComposerInternalOptions, CustomBlocks } from './composer'
 import {
   VueI18n,
   VueI18nInternal,
@@ -13,6 +13,129 @@ import {
 } from './legacy'
 import { I18nInternal } from './i18n'
 
+declare module '@vue/runtime-core' {
+  interface ComponentCustomOptions {
+    /**
+     * VueI18n options
+     *
+     * @remarks
+     * See the {@link VueI18nOptions}
+     */
+    i18n?: VueI18nOptions
+    /**
+     * For custom blocks options
+     * @internal
+     */
+    __i18n?: CustomBlocks
+  }
+  interface ComponentCustomProperties {
+    /**
+     * VueI18n class compatible interface. See {@link VueI18n}
+     *
+     * @remarks
+     * If you have specified an `i18n` option at component options,
+     * you will be able to get a VueI18n instance at the component,
+     * Otherwise, you will be able get root VueI18n instance.
+     *
+     * This property is supported for legacy API only
+     */
+    $i18n?: VueI18n
+    /**
+     * translation method
+     *
+     * @param key - required, type {@link Path}
+     * @param locale - optional, type {@link Locale}
+     * @param values - optional, type `Array` or `Object`
+     * @returns translated string
+     *
+     * @remarks
+     * Localize the locale message of `key`.
+     * Localize in preferentially component locale messages than global locale messages.
+     * If not specified component locale messages, localize with global locale messages.
+     * If you specified `locale`, localize the locale messages of `locale`.
+     * If you specified `key` of list / named formatting local messages, you must specify `values` too.
+     *
+     * This property is supported for legacy API only
+     */
+    $t?: (...args: unknown[]) => TranslateResult
+    /**
+     * pluralization method
+     *
+     * @param key - required, type {@link Path}
+     * @param choice - optional, type `number`, default `1`
+     * @param locale - optional, type {@link Locale}
+     * @param values - optional, type `string` or `Array` or `Object`
+     * @returns pluralized string
+     *
+     * @remarks
+     * Localize the locale message of `key` with pluralization.
+     * Localize in preferentially component locale messages than global locale messages.
+     * If not specified component locale messages, localize with global locale messages.
+     * If you specified `locale`, localize the locale messages of `locale`.
+     * If you will specify string value to `values`, localize the locale messages of value.
+     * If you will specify Array or Object value to `values`, you must specify with `values` of `$t`.
+     *
+     * This property is supported for legacy API only
+     */
+    $tc?: (...args: unknown[]) => TranslateResult
+    /**
+     * translation exist method
+     *
+     * @param key - required, type {@link Path}
+     * @param locale - optional, type {@link Locale}
+     * @returns key exsiting result
+     *
+     * @remarks
+     * Check whether key exists.
+     * In Vue instance, If not specified component locale messages,
+     * check with global locale messages. If you specified `locale`, check the locale messages of `locale`
+     *
+     * This property is supported for legacy API only
+     */
+    $te?: (key: Path, locale?: Locale) => boolean
+    /**
+     * datetime method
+     *
+     * @param value - required, type `number` or `Date`
+     * @param key - optional, type {@link Path} or `Object`
+     * @param locale - optional, type {@link Locale}
+     * @returns formatted datetime result
+     *
+     * @remarks
+     * Localize the datetime of `value` with datetime format of `key`.
+     * The datetime format of `key` need to register to `dateTimeFormats` option of {@link VueI18nOptions},
+     * and depend on `locale` option of {@link VueI18nOptions}.
+     * If you will specify locale argument, it will have priority over `locale` of {@link VueI18nOptions}.
+     *
+     * If the datetime format of `key` not exist in `dateTimeFormats` option,
+     * fallback to depend on `fallbackLocale` of {@link VueI18nOptions}.
+     *
+     * This property is supported for legacy API only
+     */
+    $d?: (...args: unknown[]) => DateTimeFormatResult
+    /**
+     * number method
+     *
+     * @param value - required, type `number`
+     * @param format - optional, type {@link Path} or `Object`
+     * @param locale - optional, type {@link Locale}
+     * @returns formatted number result
+     *
+     * @remarks
+     * Localize the number of `value` with number format of `format`.
+     * The number format of `format` need to register to `numberFormats` option of {@link VueI18nOptions},
+     * and depend on `locale` option of {@link VueI18nOptions}.
+     * If you will specify `locale` argument, it will have priority over `locale` option of {@link VueI18nOptions}
+     *
+     * If the number format of `format` not exist in `numberFormats` option,
+     * fallback to depend on `fallbackLocale` option of {@link VueI18nOptions}
+     *
+     * This property is supported for legacy API only
+     */
+    $n?: (...args: unknown[]) => NumberFormatResult
+  }
+}
+
 // supports compatibility for legacy vue-i18n APIs
 export function defineMixin(
   legacy: VueI18n & VueI18nInternal,