fix(core): remove runtime whitespace trimming aligned with v5 (#2169)

packages/core/src/i18n.test.ts

@@ -215,7 +215,7 @@ describe("I18n", () => {
         id: "My name is {name}",
         message: "Je m'appelle {name}",
       })
-    ).toEqual("Je m'appelle")
+    ).toEqual("Je m'appelle ")
 
     // Untranslated message
     expect(i18n._("Missing message")).toEqual("Missing message")
@@ -263,6 +263,23 @@ describe("I18n", () => {
     ).toEqual("Mi 'nombre' es {name}")
   })
 
+  it("._ should not trim whitespaces in translated messages", () => {
+    const messages = {}
+
+    const i18n = setupI18n({
+      locale: "es",
+      messages: { es: messages },
+    })
+
+    expect(
+      i18n._({
+        id: "msg",
+        /* note the space at the end */
+        message: " Hello ",
+      })
+    ).toEqual(" Hello ")
+  })
+
   it("._ shouldn't compile uncompiled messages in production", () => {
     const messages = {
       Hello: "Salut",

packages/core/src/interpolate.test.ts

@@ -44,7 +44,7 @@ describe("interpolate", () => {
     expect(plural({ value: 1 })).toEqual("1 Book")
     expect(plural({ value: 2 })).toEqual("2 Books")
     expect(plural({ value: 4 })).toEqual("Four books")
-    expect(plural({ value: 99 })).toEqual("Books with problems")
+    expect(plural({ value: 99 })).toEqual(" Books with problems ")
 
     const offset = prepare(
       "{value, plural, offset:1 =0 {No Books} one {# Book} other {# Books}}"

packages/core/src/interpolate.ts

@@ -152,9 +152,9 @@ export function interpolate(
       // convert raw unicode sequences back to normal strings
       // note JSON.parse hack is not working as you might expect https://stackoverflow.com/a/57560631/2210610
       // that's why special library for that purpose is used
-      return unraw(result.trim())
+      return unraw(result)
     }
-    if (isString(result)) return result.trim()
+    if (isString(result)) return result
     return result ? String(result) : ""
   }
 }