Use TypeScript for translation service

package.json

@@ -5,7 +5,7 @@
   "type": "module",
   "scripts": {
     "start": "tsx ./server/server.ts",
-    "test": "tsc && node --test",
+    "test": "tsc && node --import tsx --test",
     "lint": "eslint . --fix"
   },
   "author": "Digitální a informační agentura",

server/http/api/v2/quality/api-v2-quality-presenter.mjs

@@ -1,4 +1,4 @@
-import { createTranslationService } from "../../../../service/translation-service.mjs";
+import { createTranslationService } from "../../../../service/translation-service";
 import local from "./api-v2-quality-presenter-localization.mjs";
 
 export default function createHandler(services) {

server/http/application-detail/application-detail-presenter.mjs

@@ -1,5 +1,5 @@
 import { ROUTE } from "../route-name.mjs";
-import { createTranslationService } from "../../service/translation-service.mjs";
+import { createTranslationService } from "../../service/translation-service";
 import { parseClientQuery } from "./application-detail-query.mjs";
 import { prepareData } from "./application-detail-model.mjs";
 import { renderHtml } from "./application-detail-view-html.mjs";

server/http/application-list/application-list-presenter.mjs

@@ -1,5 +1,5 @@
 import { ROUTE } from "../route-name.mjs";
-import { createTranslationService } from "../../service/translation-service.mjs";
+import { createTranslationService } from "../../service/translation-service";
 import { parseClientQuery, beforeLinkCallback } from "./application-list-query.mjs";
 import { prepareData } from "./application-list-model.mjs";
 import { renderHtml } from "./application-list-view-html.mjs";

server/http/dataset-detail/dataset-detail-presenter.mjs

@@ -1,5 +1,5 @@
 import { ROUTE } from "../route-name.mjs";
-import { createTranslationService } from "../../service/translation-service.mjs";
+import { createTranslationService } from "../../service/translation-service";
 import { parseClientQuery, beforeLinkCallback } from "./dataset-detail-query.mjs";
 import { prepareData } from "./dataset-detail-model.mjs";
 import { renderHtml } from "./dataset-detail-view-html.mjs";

server/http/dataset-list/dataset-list-presenter.mjs

@@ -1,5 +1,5 @@
 import { ROUTE } from "../route-name.mjs";
-import { createTranslationService } from "../../service/translation-service.mjs";
+import { createTranslationService } from "../../service/translation-service";
 import { parseClientQuery, beforeLinkCallback } from "./dataset-list-query.mjs";
 import { prepareData } from "./dataset-list-model.mjs";
 import { renderHtml } from "./dataset-list-view-html.mjs";

server/http/local-catalog-list/local-catalog-list-presenter.mjs

@@ -1,5 +1,5 @@
 import { ROUTE } from "../route-name.mjs";
-import { createTranslationService } from "../../service/translation-service.mjs";
+import { createTranslationService } from "../../service/translation-service";
 import { prepareData } from "./local-catalog-list-model.mjs";
 import { renderHtml } from "./local-catalog-list-view-html.mjs";
 import localization from "./local-catalog-list-localization.mjs";

server/http/publisher-list/publisher-list-presenter.mjs

@@ -1,5 +1,5 @@
 import { ROUTE } from "../route-name.mjs";
-import { createTranslationService } from "../../service/translation-service.mjs";
+import { createTranslationService } from "../../service/translation-service";
 import { prepareData } from "./publisher-list-model.mjs";
 import { renderHtml } from "./publisher-list-view-html.mjs";
 import localization from "./publisher-list-localization.mjs";

server/http/suggestion-detail/suggestion-detail-presenter.mjs

@@ -1,5 +1,5 @@
 import { ROUTE } from "../route-name.mjs";
-import { createTranslationService } from "../../service/translation-service.mjs";
+import { createTranslationService } from "../../service/translation-service";
 import { parseClientQuery } from "./suggestion-detail-query.mjs";
 import { prepareData } from "./suggestion-detail-model.mjs";
 import { renderHtml } from "./suggestion-detail-view-html.mjs";

server/http/suggestion-list/suggestion-list-presenter.mjs

@@ -1,5 +1,5 @@
 import { ROUTE } from "../route-name.mjs";
-import { createTranslationService } from "../../service/translation-service.mjs";
+import { createTranslationService } from "../../service/translation-service";
 import { parseClientQuery, beforeLinkCallback } from "./suggestion-list-query.mjs";
 import { prepareData } from "./suggestion-list-model.mjs";
 import { renderHtml } from "./suggestion-list-view-html.mjs";

server/service/translation-service.test.mjs

@@ -1,6 +1,6 @@
 import assert from "node:assert";
 import { describe, it } from "node:test"
-import { createTranslationService } from "./translation-service.mjs";
+import { createTranslationService } from "./translation-service";
 
 describe("Translation service.", () => {
 

server/service/translation-service.ts

@@ -0,0 +1,51 @@
+
+export type Translations = Record<string, string | Function>;
+
+export interface TranslationService {
+  translate: (serverMessage: string, args: any) => string;
+}
+
+/**
+ * Create translation service from pairs or server local strings.
+ */
+export function createTranslationService(serverToLocal: Translations) {
+  return new DefaultTranslationService(serverToLocal);
+}
+
+class DefaultTranslationService implements TranslationService {
+
+  readonly serverToLocal: Translations;
+
+  constructor(serverToLocal: Translations) {
+    this.serverToLocal = serverToLocal;
+  }
+
+  translate(serverMessage: string, args: any) {
+    let result;
+    const entry = this.serverToLocal[serverMessage];
+    // When given a function we do not care about anything else.
+    if (entry instanceof Function) {
+      return entry(args);
+    }
+    // We allow for simple "{}" substitution.
+    if (Array.isArray(entry)) {
+      // Initial value.
+      result = entry[0][1];
+      for (let [separator, localizedMessage] of entry) {
+        if (separator > args) {
+          break;
+        }
+        result = localizedMessage;
+      }
+    } else {
+      result = entry;
+      if (result === undefined) {
+        console.error("Missing localization entry.", { serverMessage });
+        result = "";
+      }
+    }
+    return result.replace("{}", args);
+  }
+
+}
+

tsconfig.json

@@ -11,6 +11,7 @@
     "esModuleInterop": true,
     "lib": ["ESNext", "DOM"],
     "skipLibCheck": true,
+    "allowJs": true,
   },
   "exclude": [
     "node_modules"