Interpolate multiple instances of variables. (#102)

Co-authored-by: Sasha Chedygov <schedygov@evidation.com>

CHANGELOG.md

@@ -17,6 +17,8 @@ project adheres to [Semantic Versioning](http://semver.org/).
 ## Unreleased
 
 - [Removed] Remove `I18n#availableLocales`, as it's no used anywhere.
+- [Changed] `I18n.t` now replaces all instances of a placeholder in a
+  translation.
 
 ## v4.4.3 - Feb 15, 2024
 

__tests__/fixtures/translations.ts

@@ -49,6 +49,8 @@ export function translations(): { [key: string]: any } {
         },
       },
     },
+
+    multiple_variables: "Hello, {{name}}! Your name is {{name}}.",
   };
 
   Translations["en-US"] = {

__tests__/interpolation.test.ts

@@ -15,6 +15,13 @@ test("performs multiple interpolations", () => {
   expect(actual).toEqual("John Doe is 27-years old");
 });
 
+test("interpolates multiple instances of each variable", () => {
+  const i18n = new I18n(translations());
+  const actual = i18n.t("multiple_variables", { name: "John Doe" });
+
+  expect(actual).toEqual("Hello, John Doe! Your name is John Doe.");
+});
+
 test("outputs missing placeholder message if interpolation value is missing", () => {
   const i18n = new I18n(translations());
   const actual = i18n.t("greetings.name");

src/helpers/interpolate.ts

@@ -46,6 +46,7 @@ export function interpolate(
 
     const regex = new RegExp(
       placeholder.replace(/\{/gm, "\\{").replace(/\}/gm, "\\}"),
+      "g",
     );
 
     message = message.replace(regex, value);