rollup-plugin-strip-final-exports/dist/esm/index.js

Rollup plugin to strip the exports left in the output files

import { walk } from 'estree-walker';
import MagicString from 'magic-string';

const isExpressionStatement = (node) => node.type === 'ExpressionStatement';
const isIdentifier = (node) => node.type === 'Identifier';
const isLiteral = (node) => node.type === 'Literal';
const isMemberExpression = (node) => node.type === 'MemberExpression';
const isAssignmentStatement = (node) => (isExpressionStatement(node)
    && node.expression.type === 'AssignmentExpression');
const isModuleIdentifier = (node) => (isIdentifier(node)
    && node.name === 'module');
const isExportsIdentifier = (node) => (isIdentifier(node)
    && node.name === 'exports');
const isExportsLiteral = (node) => (isLiteral(node)
    && node.value === 'exports');
const isModuleExportsWithIdentifier = (memberExpression) => (isModuleIdentifier(memberExpression.object)
    && isExportsIdentifier(memberExpression.property));
const isModuleExportsWithLiteral = (memberExpression) => (isModuleIdentifier(memberExpression.object)
    && isExportsLiteral(memberExpression.property));
const isModuleExportsExpression = (memberExpression) => (isModuleExportsWithIdentifier(memberExpression)
    || isModuleExportsWithLiteral(memberExpression));
const utils = {
    isAssignmentStatement,
    isExportsIdentifier,
    isMemberExpression,
    isModuleExportsExpression,
    isModuleIdentifier,
};

const isModuleExportsMemberExpression = (expression) => (utils.isMemberExpression(expression)
    && utils.isModuleExportsExpression(expression));
const isCJSExportsAssignment = (memberExpression) => (utils.isExportsIdentifier(memberExpression.object)
    || utils.isModuleExportsExpression(memberExpression)
    || isModuleExportsMemberExpression(memberExpression.object));
const isCJSModuleExportStatement = (node) => (utils.isAssignmentStatement(node)
    && utils.isMemberExpression(node.expression.left)
    && isCJSExportsAssignment(node.expression.left));
const isESModuleExportStatement = (node) => [
    'ExportAllDeclaration',
    'ExportDefaultDeclaration',
    'ExportNamedDeclaration',
].includes(node.type);
const isCJSExport = (node, rollupOptions) => (rollupOptions.format === 'cjs'
    && isCJSModuleExportStatement(node));
const isESModuleExport = (node, rollupOptions) => (rollupOptions.format === 'es'
    && isESModuleExportStatement(node));
const isExport = (node, rollupOptions) => (isCJSExport(node, rollupOptions)
    || isESModuleExport(node, rollupOptions));

const index = (stripExportsOptions = {}) => ({
    name: 'Strip final exports',
    renderChunk(sourceCode, chunk, rollupOptions) {
        const ast = this.parse(sourceCode);
        const magicString = new MagicString(sourceCode);
        walk(ast, {
            enter(node) {
                if (isExport(node, rollupOptions)) {
                    const { start, end } = node;
                    magicString.remove(start, end);
                }
            },
        });
        const code = magicString.toString();
        const map = stripExportsOptions.sourceMap ? magicString.generateMap() : null;
        return { code, map };
    },
});

export { index as default };