/**
 * Load user-provided sim stubs from the `sim/` directory.
 *
 * Each `sim/<name>.stub.ts` file is a JS/TS module that directly implements
 * the corresponding `native:*` native module. The source is read as text,
 * TypeScript types are stripped, and the result is registered as a virtual
 * module in the QuickJS runtime (replacing the native C module).
 *
 * Stubs run inside QuickJS, not in Node.js. They should export the same
 * interface as the native module they replace.
 *
 * Returns a map of native:* module name → source string.
 */
export declare function loadSimStubs(projectDir: string): Record<string, string>;
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