js-slang/dist/modules/preprocessor/transformers/removeExports.js

Javascript-based implementations of Source, written in Typescript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const misc_1 = require("../../../utils/misc");
/**
 * Removes all export-related nodes from the AST.
 *
 * Export-related AST nodes are only needed in the local imports pre-processing
 * step to determine which functions/variables/expressions should be made
 * available to other files/modules. After which, they have no functional effect
 * on program evaluation.
 *
 * @param program The AST which should be stripped of export-related nodes.
 */
function removeExports(program) {
    program.body = (0, misc_1.mapAndFilter)(program.body, node => {
        switch (node.type) {
            case 'ExportDefaultDeclaration':
                // 'node.declaration' can be either a Declaration or an Expression.
                // If the ExportDefaultDeclaration node contains a declaration, replace
                // it with the declaration node in its parent node's body.
                return node.declaration.type === 'FunctionDeclaration' ||
                    node.declaration.type === 'ClassDeclaration'
                    ? node.declaration
                    : undefined;
            case 'ExportNamedDeclaration':
                // If the ExportNamedDeclaration node contains a declaration, replace
                // it with the declaration node in its parent node's body.
                return !node.declaration ? undefined : node.declaration;
            case 'ExportAllDeclaration':
                return undefined;
            default:
                return node;
        }
    });
}
exports.default = removeExports;
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