fix: export TranslationSignatureResolver type (#228)

Author: kazupon

docs/@intlify/vue-i18n-extensions-api.md

@@ -6,6 +6,8 @@
   - [transformVTDirective](#transformvtdirective)
 - [Interface](#interface)
   - [TransformVTDirectiveOptions](#transformvtdirectiveoptions)
+- [TypeAlias](#typealias)
+  - [TranslationSignatureResolver](#translationsignatureresolver)
 
 ## Function
 
@@ -127,7 +129,7 @@ Translation function signatures
 
 **Signature:**
 ```typescript
-translationSignatures?: string | string[];
+translationSignatures?: string | TranslationSignatureResolver | string[] | TranslationSignatureResolver[] | (string | TranslationSignatureResolver)[];
 ```
 
 #### Remarks
@@ -136,3 +138,49 @@ You can specify the signature of the translation function attached to the bindin
 
 
 
+## TypeAlias
+
+### TranslationSignatureResolver
+
+Translation signature resolver
+
+**Signature:**
+```typescript
+type TranslationSignatureResolver = (context: TransformContext) => string;
+```
+
+#### Remarks
+
+This resolver is used at ['translationSignatures' option](#transformvtdirectiveoptions)
+
+###1 Examples
+
+
+```js
+import { compile } from '@vue/compiler-dom'
+import { transformVTDirective } from '@intlify/vue-i18n-extensions'
+
+// the below is just an example, you can use your own signature resolver
+const signatureMap = new Map()
+
+const transformVT = transformVTDirective({
+  translationSignatures: (context) => {
+    const { prefixIdentifiers, bindingMetadata, inline, filename } = context
+    let signature = ''
+
+    // something logic to resolve signature like using `signatureMap`
+    // signature = signatureMap.get(filename)
+    // ...
+
+    return signature
+  }
+})
+
+const { code } = compile(`<p v-t="'hello'"></p>`, {
+  // ...
+  directiveTransforms: { t: transformVT }
+})
+```
+
+
+

src/index.ts

@@ -1,2 +1,2 @@
 export { transformVTDirective } from './transform'
-export type { TransformVTDirectiveOptions } from './transform'
+export type { TransformVTDirectiveOptions, TranslationSignatureResolver } from './transform'

src/transform.ts

@@ -56,6 +56,8 @@ type VTDirectiveValue = {
  * @remarks
  * This resolver is used at {@link TransformVTDirectiveOptions | 'translationSignatures' option}
  *
+ * @public
+ *
  * @example
  * ```js
  * import { compile } from '@vue/compiler-dom'