2 files changed, 70 insertions, 0 deletions
diff --git a/src/cdp/errors.ts b/src/cdp/errors.ts
new file mode 100644
index 0000000..cf1dab7
--- /dev/null
+++ b/src/cdp/errors.ts
@@ -0,0 +1,19 @@
+export type CdpErrorKind =
+  | "transport_closed"
+  | "timeout"
+  | "session_not_found"
+  | "remote_error"
+  | "discovery_failed"
+  | "invalid_response";
+
+export type CdpError = {
+  readonly kind: CdpErrorKind;
+  readonly message: string;
+  readonly method?: string;
+};
+
+export const cdpError = (
+  kind: CdpErrorKind,
+  message: string,
+  method?: string,
+): CdpError => ({ kind, message, ...(method !== undefined ? { method } : {}) });
diff --git a/src/cdp/types.ts b/src/cdp/types.ts
new file mode 100644
index 0000000..cbcb2d5
--- /dev/null
+++ b/src/cdp/types.ts
@@ -0,0 +1,51 @@
+export type CdpEvent = {
+  readonly method: string;
+  readonly params: unknown;
+  readonly sessionId?: string;
+};
+
+export type CdpRawMessage = {
+  readonly id?: number;
+  readonly method?: string;
+  readonly params?: Record<string, unknown>;
+  readonly result?: unknown;
+  readonly error?: { readonly message: string; readonly code?: number };
+  readonly sessionId?: string;
+};
+
+export type DialogInfo = {
+  readonly type: "alert" | "confirm" | "prompt" | "beforeunload";
+  readonly message: string;
+  readonly defaultPrompt?: string;
+};
+
+export type TabInfo = {
+  readonly targetId: string;
+  readonly title: string;
+  readonly url: string;
+};
+
+export type PageInfo = {
+  readonly url: string;
+  readonly title: string;
+  readonly width: number;
+  readonly height: number;
+  readonly scrollX: number;
+  readonly scrollY: number;
+  readonly pageWidth: number;
+  readonly pageHeight: number;
+};
+
+export type DaemonStatus = {
+  readonly alive: boolean;
+  readonly sessionId: string | null;
+  readonly namespace: string;
+  readonly remoteBrowserId?: string;
+};
+
+const INTERNAL_PREFIXES: ReadonlyArray<string> = [
+  "chrome://", "chrome-untrusted://", "devtools://", "chrome-extension://", "about:",
+];
+
+export const isInternalUrl = (url: string): boolean =>
+  INTERNAL_PREFIXES.some((p) => url.startsWith(p));