ModuleScope.js

import { forOwn } from '../../utils/object.js';
import relativeId from '../../utils/relativeId.js';
import Scope from './Scope.js';
import LocalVariable from '../variables/LocalVariable';
import { UNKNOWN_ASSIGNMENT } from '../values';

export default class ModuleScope extends Scope {
	constructor ( module ) {
		super( {
			isModuleScope: true,
			parent: module.bundle.scope
		} );

		this.module = module;
		this.variables.this = new LocalVariable( 'this', null, UNKNOWN_ASSIGNMENT );
	}

	deshadow ( names ) {
		names = new Set( names );

		forOwn( this.module.imports, specifier => {
			if ( specifier.module.isExternal ) return;

			const addDeclaration = declaration => {
				if ( declaration.isNamespace && !declaration.isExternal ) {
					declaration.module.getExports().forEach( name => {
						addDeclaration( declaration.module.traceExport( name ) );
					} );
				}

				names.add( declaration.name );
			};

			specifier.module.getExports().forEach( name => {
				addDeclaration( specifier.module.traceExport( name ) );
			} );

			if ( specifier.name !== '*' ) {
				const declaration = specifier.module.traceExport( specifier.name );
				if ( !declaration ) {
					this.module.warn( {
						code: 'NON_EXISTENT_EXPORT',
						name: specifier.name,
						source: specifier.module.id,
						message: `Non-existent export '${specifier.name}' is imported from ${relativeId( specifier.module.id )}`
					}, specifier.specifier.start );
					return;
				}

				const name = declaration.getName( true );
				if ( name !== specifier.name ) {
					names.add( declaration.getName( true ) );
				}

				if ( specifier.name !== 'default' && specifier.specifier.imported.name !== specifier.specifier.local.name ) {
					names.add( specifier.specifier.imported.name );
				}
			}
		} );

		super.deshadow( names );
	}

	findLexicalBoundary () {
		return this;
	}

	findVariable ( name ) {
		if ( this.variables[ name ] ) {
			return this.variables[ name ];
		}

		return this.module.trace( name ) || this.parent.findVariable( name );
	}
}