vite-plugin-commonjs-externals/dist/index.mjs

Provides commonjs externals support for Vite.

import * as acorn from 'acorn';
import * as esModuleLexer from 'es-module-lexer';
import MagicString from 'magic-string';

function transformEsm(imports, code, externals) {
    const imports2 = imports
        .map(i => (Object.assign(Object.assign({}, i), { importStatement: code.substring(i.ss, i.se) })))
        .filter(({ n, d }) => 
    // static import
    d === -1 &&
        n !== undefined &&
        externals.some(external => typeof external === 'string'
            ? external === n
            : external instanceof RegExp
                ? external.test(n)
                : false));
    if (imports2.length === 0) {
        return;
    }
    const magicString = new MagicString(code);
    imports2.forEach(({ importStatement, ss, se }) => {
        const program = acorn.parse(importStatement, {
            ecmaVersion: 'latest',
            sourceType: 'module',
        });
        const node = program.body[0];
        if ((node === null || node === void 0 ? void 0 : node.type) !== 'ImportDeclaration') {
            return;
        }
        if (typeof node.source.value !== 'string') {
            return;
        }
        if (node.specifiers.length === 0) {
            magicString.overwrite(ss, se, `require('${node.source.value}')`);
            return;
        }
        const importNamespaceSpecifierList = node.specifiers.filter(x => x.type === 'ImportNamespaceSpecifier');
        const importDefaultSpecifierList = node.specifiers.filter(x => x.type === 'ImportDefaultSpecifier');
        const importSpecifierList = node.specifiers.filter(x => x.type === 'ImportSpecifier');
        if (importNamespaceSpecifierList.length > 1) {
            throw new Error(`Illegal state of importNamespaceSpecifierList: it can only have zero or one namespace import. \`${importStatement}\``);
        }
        if (importDefaultSpecifierList.length > 1) {
            throw new Error(`Illegal state of importDefaultSpecifierList: it can only have zero or one default import. \`${importStatement}\``);
        }
        const requireStatement = (identifiers) => `const ${identifiers}=(()=>{const mod = require("${node.source.value}");return mod && mod.__esModule ? mod : Object.assign(Object.create(null),mod,{default:mod,[Symbol.toStringTag]:"Module"})})();`;
        const localNamesIdentifiers = [
            ...importSpecifierList.map(spec => `${spec.imported.name}: ${spec.local.name}`),
            ...importDefaultSpecifierList.map(spec => `default: ${spec.local.name}`),
        ].join(', ');
        if (importNamespaceSpecifierList.length === 0) {
            magicString.overwrite(ss, se, requireStatement(`{${localNamesIdentifiers}}`));
            return;
        }
        const namespaceIdentifier = importNamespaceSpecifierList[0].local.name;
        const namespaceRequireStatement = requireStatement(namespaceIdentifier);
        if (localNamesIdentifiers === '') {
            magicString.overwrite(ss, se, namespaceRequireStatement);
            return;
        }
        magicString.overwrite(ss, se, namespaceRequireStatement +
            `const {${localNamesIdentifiers}}=${namespaceIdentifier};`);
    });
    return {
        code: magicString.toString(),
        map: magicString.generateMap(),
    };
}
const commonjsExternalsPlugin = ({ externals, exts = ['ts', 'tsx', 'js', 'jsx', 'mjs', 'cjs', 'vue', 'svelte'], }) => ({
    name: 'commonjs-externals',
    async transform(code, id) {
        if (!exts.some(ext => id.endsWith('.' + ext))) {
            return;
        }
        await esModuleLexer.init;
        const [imports] = esModuleLexer.parse(code);
        return transformEsm(imports, code, externals);
    },
});

export { commonjsExternalsPlugin as default };
//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoiaW5kZXgubWpzIiwic291cmNlcyI6W10sInNvdXJjZXNDb250ZW50IjpbXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6Ijs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7Ozs7OzsifQ==