diff --git a/packages/angular/build/src/builders/application/i18n.ts b/packages/angular/build/src/builders/application/i18n.ts
index f212659a14be..058a2fa3d6a4 100644
--- a/packages/angular/build/src/builders/application/i18n.ts
+++ b/packages/angular/build/src/builders/application/i18n.ts
@@ -42,14 +42,13 @@ export async function inlineI18n(
   warnings: string[];
   prerenderedRoutes: PrerenderedRoutesRecord;
 }> {
-  const { i18nOptions, optimizationOptions, baseHref, cacheOptions } = options;
+  const { i18nOptions, baseHref, cacheOptions } = options;
 
   // Create the multi-threaded inliner with common options and the files generated from the build.
   const inliner = new I18nInliner(
     {
       missingTranslation: i18nOptions.missingTranslationBehavior ?? 'warning',
       outputFiles: executionResult.outputFiles,
-      shouldOptimize: optimizationOptions.scripts,
       persistentCachePath: cacheOptions.enabled ? cacheOptions.path : undefined,
       localizeVersion: i18nOptions.localizeVersion,
     },
diff --git a/packages/angular/build/src/tools/esbuild/i18n-inliner-worker.ts b/packages/angular/build/src/tools/esbuild/i18n-inliner-worker.ts
index af9d9dce134b..d6a56ad10d74 100644
--- a/packages/angular/build/src/tools/esbuild/i18n-inliner-worker.ts
+++ b/packages/angular/build/src/tools/esbuild/i18n-inliner-worker.ts
@@ -7,6 +7,7 @@
  */
 
 import remapping, { type DecodedSourceMap, type SourceMapInput } from '@ampproject/remapping';
+import type { ɵParsedTranslation } from '@angular/localize';
 import type { Node } from '@oxc-project/types';
 import { MagicString } from 'magic-string';
 import assert from 'node:assert';
@@ -16,29 +17,6 @@ import { parseSync, visitorKeys } from 'oxc-parser';
 import { loadLocaleData } from './i18n-locale-plugin';
 import { createSharedTranslationProxy } from './i18n-translation-reader';
 
-/**
- * The options passed to the inliner for each file request
- */
-interface InlineFileRequest {
-  /**
-   * The filename that should be processed. The data for the file is provided to the Worker
-   * during Worker initialization.
-   */
-  filename: string;
-
-  /**
-   * The locale specifier that should be used during the inlining process of the file.
-   */
-  locale: string;
-
-  /**
-   * The serialized translation messages for the locale that should be used during the inlining
-   * process of the file. A SharedArrayBuffer or Blob is used so that the messages are shared with
-   * the Worker by reference instead of being copied into it for every request.
-   */
-  translation?: Blob | SharedArrayBuffer;
-}
-
 /**
  * The options passed to the inliner for each code request
  */
@@ -77,9 +55,9 @@ interface InlineFileBatchRequest {
   filename: string;
 
   /**
-   * The locale specifiers or locale objects that should be used during the inlining process of the file.
+   * The locale specifiers and optional translations to use during the inlining process of the file.
    */
-  locales: (string | { locale: string; translation?: Blob | SharedArrayBuffer })[];
+  locales: ReadonlyMap<string, Blob | SharedArrayBuffer | undefined>;
 
   /**
    * Whether the file data should be treated as ephemeral and not cached long-term in the Worker.
@@ -113,10 +91,9 @@ interface InlineFileBatchResult {
 }
 
 // Extract the application files and common options used for inline requests from the Worker context
-const { files, missingTranslation, translations } = (workerData || {}) as {
+const { files, missingTranslation } = (workerData || {}) as {
   files: ReadonlyMap<string, Blob>;
   missingTranslation: 'error' | 'warning' | 'ignore';
-  translations?: ReadonlyMap<string, Blob | SharedArrayBuffer>;
 };
 
 /**
@@ -135,7 +112,7 @@ const fileDataCache = new Map<string, Promise<CachedFileData>>();
 /**
  * Cache of deserialized translation messages keyed by locale.
  */
-const deserializedTranslations = new Map<string, Promise<Record<string, unknown>>>();
+const deserializedTranslations = new Map<string, Promise<Record<string, ɵParsedTranslation>>>();
 
 /**
  * Retrieves the file data for a filename, loading and extracting localization metadata.
@@ -183,24 +160,23 @@ function loadFileData(filename: string, cache = true): Promise<CachedFileData> {
 function loadTranslation(
   locale: string,
   translation?: Blob | SharedArrayBuffer,
-): Promise<Record<string, unknown>> | undefined {
-  const translationData = translation ?? translations?.get(locale);
-  if (!translationData) {
+): Promise<Record<string, ɵParsedTranslation>> | undefined {
+  if (!translation) {
     return undefined;
   }
 
   let messagesPromise = deserializedTranslations.get(locale);
   if (!messagesPromise) {
-    if (translationData instanceof Blob) {
-      messagesPromise = translationData
+    if (translation instanceof Blob) {
+      messagesPromise = translation
         .arrayBuffer()
-        .then((buffer) => deserialize(new Uint8Array(buffer)) as Record<string, unknown>)
+        .then((buffer) => deserialize(new Uint8Array(buffer)) as Record<string, ɵParsedTranslation>)
         .catch((error) => {
           deserializedTranslations.delete(locale);
           throw error;
         });
     } else {
-      messagesPromise = Promise.resolve(createSharedTranslationProxy(translationData));
+      messagesPromise = Promise.resolve(createSharedTranslationProxy(translation));
     }
     deserializedTranslations.set(locale, messagesPromise);
   }
@@ -208,38 +184,6 @@ function loadTranslation(
   return messagesPromise;
 }
 
-/**
- * Inlines the provided locale and translation into a JavaScript file that contains `$localize` usage.
- * This function is the main entry for the Worker's action that is called by the worker pool.
- *
- * @param request An InlineRequest object representing the options for inlining
- * @returns An object containing the inlined file and optional map content.
- */
-export default async function inlineFile(request: InlineFileRequest) {
-  const { code, metadata } = await loadFileData(request.filename, true);
-
-  // Sourcemaps are parsed on demand per request rather than cached long-term to prevent
-  // monotonic memory growth as a worker processes multiple files across the build.
-  const rawMap = await files.get(request.filename + '.map')?.text();
-  const map = rawMap ? (JSON.parse(rawMap) as SourceMapInput) : undefined;
-
-  const result = await inlineLocalize(
-    code,
-    map,
-    metadata,
-    request.locale,
-    await loadTranslation(request.locale, request.translation),
-    request.filename,
-  );
-
-  return {
-    file: request.filename,
-    code: result.code,
-    map: result.map,
-    messages: result.diagnostics.messages,
-  };
-}
-
 /**
  * Inlines multiple locales and translations into a JavaScript file that contains `$localize` usage.
  *
@@ -266,9 +210,7 @@ export async function inlineFileBatch(
   const map = rawMap ? (JSON.parse(rawMap) as SourceMapInput) : undefined;
 
   const results = await Promise.all(
-    request.locales.map(async (entry) => {
-      const locale = typeof entry === 'string' ? entry : entry.locale;
-      const translation = typeof entry === 'string' ? undefined : entry.translation;
+    Array.from(request.locales, async ([locale, translation]) => {
       const result = await inlineLocalize(
         code,
         map,
@@ -490,7 +432,7 @@ async function inlineLocalize(
   map: SourceMapInput | undefined,
   metadata: FileLocalizeMetadata,
   locale: string,
-  translation: Record<string, unknown> | undefined,
+  translation: Record<string, ɵParsedTranslation> | undefined,
   filename: string,
 ) {
   const magicString = new MagicString(code);
diff --git a/packages/angular/build/src/tools/esbuild/i18n-inliner.ts b/packages/angular/build/src/tools/esbuild/i18n-inliner.ts
index 41de55de666f..33b570a46017 100644
--- a/packages/angular/build/src/tools/esbuild/i18n-inliner.ts
+++ b/packages/angular/build/src/tools/esbuild/i18n-inliner.ts
@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import type { ɵParsedTranslation } from '@angular/localize';
 import assert from 'node:assert';
 import { extname, join } from 'node:path';
 import { serialize } from 'node:v8';
@@ -38,7 +39,7 @@ const DEFAULT_LOCALE_WINDOW_SIZE = 8;
  * @returns A SharedArrayBuffer or Blob containing the serialized messages, or undefined if none.
  */
 function serializeTranslation(
-  translation: Record<string, unknown> | undefined,
+  translation: Record<string, ɵParsedTranslation> | undefined,
 ): SharedArrayBuffer | Blob | undefined {
   if (!translation) {
     return undefined;
@@ -57,10 +58,8 @@ function serializeTranslation(
 export interface I18nInlinerOptions {
   missingTranslation: 'error' | 'warning' | 'ignore';
   outputFiles: BuildOutputFile[];
-  shouldOptimize?: boolean;
   persistentCachePath?: string;
   localizeVersion?: string;
-  translations?: ReadonlyMap<string, Blob | SharedArrayBuffer>;
 }
 
 /**
@@ -75,7 +74,7 @@ export interface LocaleInlineOptions {
   /**
    * The translation messages for the locale, or undefined for the source/untranslated locale.
    */
-  translation?: Record<string, unknown>;
+  translation?: Record<string, ɵParsedTranslation>;
 
   /**
    * An optional content integrity hash of the translation file(s) for fast cache key calculation.
@@ -155,7 +154,7 @@ export class I18nInliner {
     maxThreads?: number,
   ) {
     this.#unmodifiedFiles = [];
-    const { outputFiles, shouldOptimize, missingTranslation, translations } = options;
+    const { outputFiles, missingTranslation } = options;
     const files = new Map<string, BuildOutputFile>();
 
     const pendingMaps = [];
@@ -206,8 +205,6 @@ export class I18nInliner {
       // Extract options to ensure only the named options are serialized and sent to the worker
       workerData: {
         missingTranslation,
-        shouldOptimize,
-        translations,
         // A Blob is an immutable data structure that allows sharing the data between workers
         // without copying until the data is actually used within a Worker. This is useful here
         // since each file may not actually be processed in each Worker and the Blob avoids
@@ -233,7 +230,7 @@ export class I18nInliner {
   ): Promise<Map<string, LocaleInlineResult>> {
     await this.initCache();
 
-    const { shouldOptimize, missingTranslation, localizeVersion } = this.options;
+    const { missingTranslation, localizeVersion } = this.options;
     const localeList = Array.from(locales);
 
     if (localeList.length === 0) {
@@ -270,7 +267,6 @@ export class I18nInliner {
                 locale,
                 translation: translationIntegrity || translation,
                 missingTranslation,
-                shouldOptimize,
                 localizeVersion,
               }),
             ),
@@ -426,10 +422,7 @@ export class I18nInliner {
           const batchResult = (await this.#workerPool.run(
             {
               filename,
-              locales: batchEntries.map((e) => ({
-                locale: e.locale,
-                translation: e.translation,
-              })),
+              locales: new Map(batchEntries.map((e) => [e.locale, e.translation])),
               ephemeral,
               activeLocales,
             },
@@ -478,7 +471,7 @@ export class I18nInliner {
    */
   async inlineForLocale(
     locale: string,
-    translation: Record<string, unknown> | undefined,
+    translation: Record<string, ɵParsedTranslation> | undefined,
     translationIntegrity?: string,
   ): Promise<LocaleInlineResult> {
     const results = await this.inlineAll([{ locale, translation, translationIntegrity }]);
@@ -490,7 +483,7 @@ export class I18nInliner {
 
   async inlineTemplateUpdate(
     locale: string,
-    translation: Record<string, unknown> | undefined,
+    translation: Record<string, ɵParsedTranslation> | undefined,
     templateCode: string,
     templateId: string,
   ): Promise<{ code: string; errors: string[]; warnings: string[] }> {
diff --git a/packages/angular/build/src/tools/esbuild/i18n-inliner_spec.ts b/packages/angular/build/src/tools/esbuild/i18n-inliner_spec.ts
index 46d1cb4145d4..acceab7513b5 100644
--- a/packages/angular/build/src/tools/esbuild/i18n-inliner_spec.ts
+++ b/packages/angular/build/src/tools/esbuild/i18n-inliner_spec.ts
@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import type { ɵParsedTranslation } from '@angular/localize';
 import { transform } from 'esbuild';
 import fs from 'node:fs/promises';
 import os from 'node:os';
@@ -21,11 +22,22 @@ import { I18nInliner } from './i18n-inliner';
 const GREETING_SOURCE = 'export const greeting = $localize`:@@greeting:Hello`;\n';
 
 /**
- * Creates the parsed translation form that `@angular/localize` expects for a message without
- * placeholders.
+ * Creates the parsed translation form that `@angular/localize` expects.
  */
-function translationFor(message: string): Record<string, unknown> {
-  return { messageParts: [message], placeholderNames: [], text: message };
+function parsedTranslation(
+  parts: string[],
+  placeholderNames: string[] = [],
+  text?: string,
+): ɵParsedTranslation {
+  return {
+    messageParts: Object.assign([...parts], { raw: [...parts] }),
+    placeholderNames,
+    text: text ?? parts.join(''),
+  };
+}
+
+function translationFor(message: string): ɵParsedTranslation {
+  return parsedTranslation([message], [], message);
 }
 
 function browserFile(path: string, contents: string): BuildOutputFile {
@@ -222,11 +234,7 @@ describe('I18nInliner', () => {
     const { outputFiles, errors, warnings } = await createInliner([
       browserFile('main.js', source),
     ]).inlineForLocale('fr', {
-      welcome: {
-        messageParts: ['Bonjour ', ' !'],
-        placeholderNames: ['PH'],
-        text: 'Bonjour {$PH} !',
-      },
+      welcome: parsedTranslation(['Bonjour ', ' !'], ['PH'], 'Bonjour {$PH} !'),
     });
 
     expect(errors).toEqual([]);
@@ -294,11 +302,11 @@ describe('I18nInliner', () => {
       browserFile('main.js', source),
     ]).inlineForLocale('fr', {
       inner: translationFor('Pomme'),
-      outer: {
-        messageParts: ['Vous avez sélectionné ', ' pour la livraison.'],
-        placeholderNames: ['PH'],
-        text: 'Vous avez sélectionné {$PH} pour la livraison.',
-      },
+      outer: parsedTranslation(
+        ['Vous avez sélectionné ', ' pour la livraison.'],
+        ['PH'],
+        'Vous avez sélectionné {$PH} pour la livraison.',
+      ),
     });
 
     expect(errors).toEqual([]);
diff --git a/packages/angular/build/src/tools/esbuild/i18n-translation-encoder.ts b/packages/angular/build/src/tools/esbuild/i18n-translation-encoder.ts
index 091d9ba0ff26..cc8f1ae50f31 100644
--- a/packages/angular/build/src/tools/esbuild/i18n-translation-encoder.ts
+++ b/packages/angular/build/src/tools/esbuild/i18n-translation-encoder.ts
@@ -6,6 +6,8 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import type { ɵParsedTranslation } from '@angular/localize';
+
 /**
  * Magic header identifier for i18n SharedArrayBuffer translation tables ('I18N').
  */
@@ -19,7 +21,9 @@ export const I18N_MAGIC_ID = 0x4931384e;
  * @param translation The translation dictionary object.
  * @returns A SharedArrayBuffer containing the binary encoded translation catalog.
  */
-export function encodeTranslationToBuffer(translation: Record<string, unknown>): SharedArrayBuffer {
+export function encodeTranslationToBuffer<T = ɵParsedTranslation>(
+  translation: Record<string, T>,
+): SharedArrayBuffer {
   const encoder = new TextEncoder();
   const entries = Object.entries(translation);
   const entryCount = entries.length;
diff --git a/packages/angular/build/src/tools/esbuild/i18n-translation-encoder_spec.ts b/packages/angular/build/src/tools/esbuild/i18n-translation-encoder_spec.ts
index c3b6409d40b5..dd660f9a4059 100644
--- a/packages/angular/build/src/tools/esbuild/i18n-translation-encoder_spec.ts
+++ b/packages/angular/build/src/tools/esbuild/i18n-translation-encoder_spec.ts
@@ -22,7 +22,7 @@ describe('SharedArrayBuffer Translation Encoder & Reader', () => {
     };
 
     const buffer = encodeTranslationToBuffer(translation);
-    const dictionary = new SharedTranslationDictionary(buffer);
+    const dictionary = new SharedTranslationDictionary<unknown>(buffer);
 
     expect(dictionary.get('greeting')).toEqual('Hello');
     expect(dictionary.get('farewell')).toEqual('Goodbye');
@@ -38,7 +38,7 @@ describe('SharedArrayBuffer Translation Encoder & Reader', () => {
     };
 
     const buffer = encodeTranslationToBuffer(translation);
-    const proxy = createSharedTranslationProxy(buffer);
+    const proxy = createSharedTranslationProxy<string>(buffer);
 
     expect(proxy['msg1']).toEqual('Message 1');
     expect(proxy['msg2']).toEqual('Message 2');
@@ -54,7 +54,7 @@ describe('SharedArrayBuffer Translation Encoder & Reader', () => {
     };
 
     const buffer = encodeTranslationToBuffer(translation);
-    const proxy = createSharedTranslationProxy(buffer);
+    const proxy = createSharedTranslationProxy<string>(buffer);
 
     expect(Object.prototype.hasOwnProperty.call(proxy, 'msg1')).toBeTrue();
     expect(Object.prototype.hasOwnProperty.call(proxy, 'unknown')).toBeFalse();
@@ -83,7 +83,7 @@ describe('SharedArrayBuffer Translation Encoder & Reader', () => {
     };
 
     const buffer = encodeTranslationToBuffer(translation);
-    const dictionary = new SharedTranslationDictionary(buffer);
+    const dictionary = new SharedTranslationDictionary<string>(buffer);
 
     expect(dictionary.get('😀')).toEqual('emoji message');
     expect(dictionary.get('\uE000')).toEqual('uE000 message');
@@ -102,8 +102,8 @@ describe('SharedArrayBuffer Translation Encoder & Reader', () => {
       msg1: 'Message 1',
     };
 
-    const buffer = encodeTranslationToBuffer(translation);
-    const dictionary = new SharedTranslationDictionary(buffer);
+    const buffer = encodeTranslationToBuffer<string>(translation);
+    const dictionary = new SharedTranslationDictionary<string>(buffer);
 
     // First lookup for missing key
     expect(dictionary.get('missingKey')).toBeUndefined();
diff --git a/packages/angular/build/src/tools/esbuild/i18n-translation-reader.ts b/packages/angular/build/src/tools/esbuild/i18n-translation-reader.ts
index bc87633da5dc..c332b47f1941 100644
--- a/packages/angular/build/src/tools/esbuild/i18n-translation-reader.ts
+++ b/packages/angular/build/src/tools/esbuild/i18n-translation-reader.ts
@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import type { ɵParsedTranslation } from '@angular/localize';
 import { I18N_MAGIC_ID } from './i18n-translation-encoder';
 
 /**
@@ -43,13 +44,13 @@ function compareBytes(
  * A zero-copy reader that queries translation messages directly from a SharedArrayBuffer
  * using binary search over a sorted key index.
  */
-export class SharedTranslationDictionary {
+export class SharedTranslationDictionary<T = ɵParsedTranslation> {
   private readonly entryCount: number;
   private readonly uint32Index: Uint32Array;
   private readonly uint8Pool: Uint8Array;
   private readonly decoder = new TextDecoder();
   private readonly encoder = new TextEncoder();
-  private readonly lazyCache = new Map<string, unknown>();
+  private readonly lazyCache = new Map<string, T | typeof NOT_FOUND>();
 
   constructor(buffer: SharedArrayBuffer) {
     if (buffer.byteLength < 16) {
@@ -86,7 +87,7 @@ export class SharedTranslationDictionary {
    * @param targetKey The message key ID to search for.
    * @returns The parsed translation message, or undefined if not found.
    */
-  get(targetKey: string): unknown | undefined {
+  get(targetKey: string): T | undefined {
     const cached = this.lazyCache.get(targetKey);
     if (cached !== undefined) {
       return cached === NOT_FOUND ? undefined : cached;
@@ -117,7 +118,7 @@ export class SharedTranslationDictionary {
         const valJson = this.decoder.decode(valBytes);
 
         try {
-          const val = JSON.parse(valJson);
+          const val = JSON.parse(valJson) as T;
           this.lazyCache.set(targetKey, val);
 
           return val;
@@ -150,8 +151,10 @@ export class SharedTranslationDictionary {
  * @param buffer The SharedArrayBuffer containing binary encoded translation catalog.
  * @returns A Proxy object that intercepts property reads and queries the SharedTranslationDictionary.
  */
-export function createSharedTranslationProxy(buffer: SharedArrayBuffer): Record<string, unknown> {
-  const dictionary = new SharedTranslationDictionary(buffer);
+export function createSharedTranslationProxy<T = ɵParsedTranslation>(
+  buffer: SharedArrayBuffer,
+): Record<string, T> {
+  const dictionary = new SharedTranslationDictionary<T>(buffer);
 
   return new Proxy(
     {},
diff --git a/packages/angular/build/src/utils/i18n-options.ts b/packages/angular/build/src/utils/i18n-options.ts
index 6a288622d053..9a55656e6798 100644
--- a/packages/angular/build/src/utils/i18n-options.ts
+++ b/packages/angular/build/src/utils/i18n-options.ts
@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import type { ɵParsedTranslation } from '@angular/localize';
 import path from 'node:path';
 import type { TranslationLoader } from './load-translations';
 
@@ -15,7 +16,7 @@ export interface LocaleDescription {
     integrity?: string;
     format?: string;
   }[];
-  translation?: Record<string, unknown>;
+  translation?: Record<string, ɵParsedTranslation>;
   dataPath?: string;
   baseHref?: string;
   subPath: string;
@@ -244,7 +245,7 @@ export function loadTranslations(
   usedFormats?: Set<string>,
   duplicateTranslation?: 'ignore' | 'error' | 'warning',
 ) {
-  let translations: Record<string, unknown> | undefined = undefined;
+  let translations: Record<string, ɵParsedTranslation> | undefined = undefined;
   for (const file of desc.files) {
     const loadResult = loader(path.join(workspaceRoot, file.path));