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/**
* Error types shared across oag-mcp components.
*
* @module errors
*/
/**
* An error carrying a stable machine-readable code and an actionable hint
* for the person running the CLI.
*/
export class OagMcpError extends Error {
readonly code: string;
readonly hint?: string;
readonly details?: Record<string, unknown>;
/**
* @param {String} code - stable error code, e.g. "SDK_LAYOUT_UNSUPPORTED"
* @param {String} message - human-readable description
* @param {Object} [opts] - optional settings
* @param {String} [opts.hint] - actionable next step
* @param {Object} [opts.details] - structured, non-sensitive context
* @param {Error} [opts.cause] - underlying error
*/
constructor(
code: string,
message: string,
opts: {
hint?: string;
details?: Record<string, unknown>;
cause?: unknown;
} = {},
) {
super(message, opts.cause ? { cause: opts.cause } : undefined);
this.name = "OagMcpError";
this.code = code;
this.hint = opts.hint;
this.details = opts.details;
}
}
/**
* Format an error for terminal output (stderr), including its hint.
*
* @param {Error} err - error to format
* @return {String} formatted message
*/
export function formatCliError(err: unknown): string {
if (err instanceof OagMcpError) {
const lines = [`Error [${err.code}]: ${err.message}`];
if (err.hint) {
lines.push(`Hint: ${err.hint}`);
}
return lines.join("\n");
}
if (err instanceof Error) {
return `Error: ${err.message}`;
}
return `Error: ${String(err)}`;
}
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