1 files changed, 71 insertions, 0 deletions
diff --git a/src/shared/constants.js b/src/shared/constants.js
new file mode 100644
index 0000000..76a679c
--- /dev/null
+++ b/src/shared/constants.js
@@ -0,0 +1,71 @@
+/**
+ * Shared constants for the extension.
+ *
+ * NOTE: This module is loaded by ES module contexts (background / popup /
+ * options / tests). The content script is a classic script and duplicates the
+ * small subset it needs (see src/content/content.js). The unit tests assert
+ * that the duplicated constants stay in sync.
+ */
+
+export const PORT_NAME = 'translation-stream';
+
+/** Maximum accepted selection length (characters). */
+export const MAX_SELECTION_LENGTH = 20000;
+
+/** Maximum length of the user-defined system prompt. */
+export const MAX_USER_SYSTEM_PROMPT_LENGTH = 2000;
+
+/** Context length presets (fixed values only). */
+export const CONTEXT_PRESETS = [4096, 8192, 16384, 32768, 131072, 262144];
+
+/** Supported target languages. */
+export const LANGUAGES = [
+  { code: 'ja', label: '日本語' },
+  { code: 'en', label: 'English' },
+  { code: 'zh-CN', label: '简体中文' },
+  { code: 'zh-TW', label: '繁體中文' },
+  { code: 'ko', label: '한국어' },
+  { code: 'fr', label: 'Français' },
+  { code: 'de', label: 'Deutsch' },
+  { code: 'es', label: 'Español' },
+  { code: 'pt', label: 'Português' },
+  { code: 'ru', label: 'Русский' }
+];
+
+/** Thinking mode values accepted by the settings UI. */
+export const THINKING_MODES = ['off', 'on', 'low', 'medium', 'high'];
+
+/** Default Ollama endpoint. */
+export const DEFAULT_OLLAMA_HOST = 'http://localhost:11434';
+
+/** Error codes exchanged between background and content script. */
+export const ERROR_CODES = {
+  INVALID_REQUEST: 'INVALID_REQUEST',
+  TEXT_EMPTY: 'TEXT_EMPTY',
+  TEXT_TOO_LONG: 'TEXT_TOO_LONG',
+  OLLAMA_UNAVAILABLE: 'OLLAMA_UNAVAILABLE',
+  MODEL_NOT_FOUND: 'MODEL_NOT_FOUND',
+  INVALID_SETTINGS: 'INVALID_SETTINGS',
+  REQUEST_ABORTED: 'REQUEST_ABORTED',
+  STREAM_ERROR: 'STREAM_ERROR',
+  UNKNOWN_ERROR: 'UNKNOWN_ERROR'
+};
+
+/** Message types: content -> background (via runtime.Port). */
+export const CONTENT_TO_BG = {
+  TRANSLATE: 'translate',
+  CANCEL: 'cancel'
+};
+
+/** Message types: background -> content (via runtime.Port). */
+export const BG_TO_CONTENT = {
+  STARTED: 'started',
+  CHUNK: 'chunk',
+  COMPLETED: 'completed',
+  ERROR: 'error'
+};
+
+/** Message types: one-shot runtime messages (popup/options -> background). */
+export const RUNTIME_MESSAGES = {
+  LIST_MODELS: 'listModels'
+};
+\ No newline at end of file