import ModuleLocatorMap from './module-locator-map';
import { ModuleLocator } from '@glimmer/interfaces';
/**
 * Maps ModuleLocators to their associated handles, and vice versa. The table
 * tracks both application handles (used to map symbolic references at compile
 * time into concrete objects at runtime) and VM handles (used to track the
 * offset of a compiled template in the binary program).
 *
 * Host environments can use this module table, provided at the end of
 * compilation, to codegen a similar data structure in the compiled JavaScript
 * output that allows the resolver to exchange handles for concrete module
 * values at runtime.
 */
export default class ExternalModuleTable {
    byModuleLocator: ModuleLocatorMap<number, ModuleLocator>;
    byHandle: Map<number, ModuleLocator>;
    vmHandleByModuleLocator: ModuleLocatorMap<number, ModuleLocator>;
    byVMHandle: Map<number, ModuleLocator>;
    /**
     * Returns the handle (unique integer id) for the provided module locator. If
     * the locator has not been seen before, a new handle is assigned. Otherwise,
     * the same handle is always returned for a given locator.
     */
    handleForModuleLocator(locator: ModuleLocator): number;
}
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