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import { type Result, err, ok } from "../util/result";
import { type CdpError, cdpError } from "./errors";
import type { CdpSession } from "./session";
/**
* Runtime.evaluate, unwrapped and narrowed. Runs `expression`, surfaces a page
* exception as an error, then applies `check` to the returned value — the
* sanctioned way to turn `unknown` evaluate output into a typed `T` without a
* cast.
*/
export const evaluateJson = async <T>(
session: CdpSession,
expression: string,
check: (v: unknown) => v is T,
): Promise<Result<T, CdpError>> => {
const r = await session.call("Runtime.evaluate", {
expression,
returnByValue: true,
awaitPromise: true,
});
if (!r.success) return r;
const { result, exceptionDetails } = r.data;
if (exceptionDetails !== undefined) {
return err(cdpError("remote_error", exceptionDetails.text, "Runtime.evaluate"));
}
const value = result.value;
if (!check(value)) {
return err(cdpError("invalid_response", `unexpected evaluate shape for: ${expression.slice(0, 60)}`, "Runtime.evaluate"));
}
return ok(value);
};
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