index.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.rewriteModuleStatementsAndPrepareHeader = rewriteModuleStatementsAndPrepareHeader;
exports.ensureStatementsHoisted = ensureStatementsHoisted;
exports.wrapInterop = wrapInterop;
exports.buildNamespaceInitStatements = buildNamespaceInitStatements;
Object.defineProperty(exports, "isModule", {
  enumerable: true,
  get: function () {
    return _helperModuleImports.isModule;
  }
});
Object.defineProperty(exports, "rewriteThis", {
  enumerable: true,
  get: function () {
    return _rewriteThis.default;
  }
});
Object.defineProperty(exports, "hasExports", {
  enumerable: true,
  get: function () {
    return _normalizeAndLoadMetadata.hasExports;
  }
});
Object.defineProperty(exports, "isSideEffectImport", {
  enumerable: true,
  get: function () {
    return _normalizeAndLoadMetadata.isSideEffectImport;
  }
});
Object.defineProperty(exports, "getModuleName", {
  enumerable: true,
  get: function () {
    return _getModuleName.default;
  }
});

var _assert = _interopRequireDefault(require("assert"));

var t = _interopRequireWildcard(require("@babel/types"));

var _template = _interopRequireDefault(require("@babel/template"));

var _chunk = _interopRequireDefault(require("lodash/chunk"));

var _helperModuleImports = require("@babel/helper-module-imports");

var _rewriteThis = _interopRequireDefault(require("./rewrite-this"));

var _rewriteLiveReferences = _interopRequireDefault(require("./rewrite-live-references"));

var _normalizeAndLoadMetadata = _interopRequireWildcard(require("./normalize-and-load-metadata"));

var _getModuleName = _interopRequireDefault(require("./get-module-name"));

function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function rewriteModuleStatementsAndPrepareHeader(path, {
  exportName,
  strict,
  allowTopLevelThis,
  strictMode,
  loose,
  noInterop,
  lazy,
  esNamespaceOnly
}) {
  (0, _assert.default)((0, _helperModuleImports.isModule)(path), "Cannot process module statements in a script");
  path.node.sourceType = "script";
  const meta = (0, _normalizeAndLoadMetadata.default)(path, exportName, {
    noInterop,
    loose,
    lazy,
    esNamespaceOnly
  });

  if (!allowTopLevelThis) {
    (0, _rewriteThis.default)(path);
  }

  (0, _rewriteLiveReferences.default)(path, meta);

  if (strictMode !== false) {
    const hasStrict = path.node.directives.some(directive => {
      return directive.value.value === "use strict";
    });

    if (!hasStrict) {
      path.unshiftContainer("directives", t.directive(t.directiveLiteral("use strict")));
    }
  }

  const headers = [];

  if ((0, _normalizeAndLoadMetadata.hasExports)(meta) && !strict) {
    headers.push(buildESModuleHeader(meta, loose));
  }

  const nameList = buildExportNameListDeclaration(path, meta);

  if (nameList) {
    meta.exportNameListName = nameList.name;
    headers.push(nameList.statement);
  }

  headers.push(...buildExportInitializationStatements(path, meta, loose));
  return {
    meta,
    headers
  };
}

function ensureStatementsHoisted(statements) {
  statements.forEach(header => {
    header._blockHoist = 3;
  });
}

function wrapInterop(programPath, expr, type) {
  if (type === "none") {
    return null;
  }

  let helper;

  if (type === "default") {
    helper = "interopRequireDefault";
  } else if (type === "namespace") {
    helper = "interopRequireWildcard";
  } else {
    throw new Error(`Unknown interop: ${type}`);
  }

  return t.callExpression(programPath.hub.addHelper(helper), [expr]);
}

function buildNamespaceInitStatements(metadata, sourceMetadata, loose = false) {
  const statements = [];
  let srcNamespace = t.identifier(sourceMetadata.name);
  if (sourceMetadata.lazy) srcNamespace = t.callExpression(srcNamespace, []);

  for (const localName of sourceMetadata.importsNamespace) {
    if (localName === sourceMetadata.name) continue;
    statements.push(_template.default.statement`var NAME = SOURCE;`({
      NAME: localName,
      SOURCE: t.cloneNode(srcNamespace)
    }));
  }

  if (loose) {
    statements.push(...buildReexportsFromMeta(metadata, sourceMetadata, loose));
  }

  for (const exportName of sourceMetadata.reexportNamespace) {
    statements.push((sourceMetadata.lazy ? _template.default.statement`
            Object.defineProperty(EXPORTS, "NAME", {
              enumerable: true,
              get: function() {
                return NAMESPACE;
              }
            });
          ` : _template.default.statement`EXPORTS.NAME = NAMESPACE;`)({
      EXPORTS: metadata.exportName,
      NAME: exportName,
      NAMESPACE: t.cloneNode(srcNamespace)
    }));
  }

  if (sourceMetadata.reexportAll) {
    const statement = buildNamespaceReexport(metadata, t.cloneNode(srcNamespace), loose);
    statement.loc = sourceMetadata.reexportAll.loc;
    statements.push(statement);
  }

  return statements;
}

const getTemplateForReexport = loose => {
  return loose ? _template.default.statement`EXPORTS.EXPORT_NAME = NAMESPACE.IMPORT_NAME;` : (0, _template.default)`
      Object.defineProperty(EXPORTS, "EXPORT_NAME", {
        enumerable: true,
        get: function() {
          return NAMESPACE.IMPORT_NAME;
        },
      });
    `;
};

const buildReexportsFromMeta = (meta, metadata, loose) => {
  const namespace = metadata.lazy ? t.callExpression(t.identifier(metadata.name), []) : t.identifier(metadata.name);
  const templateForCurrentMode = getTemplateForReexport(loose);
  return Array.from(metadata.reexports, ([exportName, importName]) => templateForCurrentMode({
    EXPORTS: meta.exportName,
    EXPORT_NAME: exportName,
    NAMESPACE: t.cloneNode(namespace),
    IMPORT_NAME: importName
  }));
};

function buildESModuleHeader(metadata, enumerable = false) {
  return (enumerable ? _template.default.statement`
        EXPORTS.__esModule = true;
      ` : _template.default.statement`
        Object.defineProperty(EXPORTS, "__esModule", {
          value: true,
        });
      `)({
    EXPORTS: metadata.exportName
  });
}

function buildNamespaceReexport(metadata, namespace, loose) {
  return (loose ? _template.default.statement`
        Object.keys(NAMESPACE).forEach(function(key) {
          if (key === "default" || key === "__esModule") return;
          VERIFY_NAME_LIST;

          EXPORTS[key] = NAMESPACE[key];
        });
      ` : _template.default.statement`
        Object.keys(NAMESPACE).forEach(function(key) {
          if (key === "default" || key === "__esModule") return;
          VERIFY_NAME_LIST;

          Object.defineProperty(EXPORTS, key, {
            enumerable: true,
            get: function() {
              return NAMESPACE[key];
            },
          });
        });
    `)({
    NAMESPACE: namespace,
    EXPORTS: metadata.exportName,
    VERIFY_NAME_LIST: metadata.exportNameListName ? (0, _template.default)`
            if (Object.prototype.hasOwnProperty.call(EXPORTS_LIST, key)) return;
          `({
      EXPORTS_LIST: metadata.exportNameListName
    }) : null
  });
}

function buildExportNameListDeclaration(programPath, metadata) {
  const exportedVars = Object.create(null);

  for (const data of metadata.local.values()) {
    for (const name of data.names) {
      exportedVars[name] = true;
    }
  }

  let hasReexport = false;

  for (const data of metadata.source.values()) {
    for (const exportName of data.reexports.keys()) {
      exportedVars[exportName] = true;
    }

    for (const exportName of data.reexportNamespace) {
      exportedVars[exportName] = true;
    }

    hasReexport = hasReexport || data.reexportAll;
  }

  if (!hasReexport || Object.keys(exportedVars).length === 0) return null;
  const name = programPath.scope.generateUidIdentifier("exportNames");
  delete exportedVars.default;
  return {
    name: name.name,
    statement: t.variableDeclaration("var", [t.variableDeclarator(name, t.valueToNode(exportedVars))])
  };
}

function buildExportInitializationStatements(programPath, metadata, loose = false) {
  const initStatements = [];
  const exportNames = [];

  for (const [localName, data] of metadata.local) {
    if (data.kind === "import") {} else if (data.kind === "hoisted") {
      initStatements.push(buildInitStatement(metadata, data.names, t.identifier(localName)));
    } else {
      exportNames.push(...data.names);
    }
  }

  for (const data of metadata.source.values()) {
    if (!loose) {
      initStatements.push(...buildReexportsFromMeta(metadata, data, loose));
    }

    for (const exportName of data.reexportNamespace) {
      exportNames.push(exportName);
    }
  }

  initStatements.push(...(0, _chunk.default)(exportNames, 100).map(members => {
    return buildInitStatement(metadata, members, programPath.scope.buildUndefinedNode());
  }));
  return initStatements;
}

function buildInitStatement(metadata, exportNames, initExpr) {
  return t.expressionStatement(exportNames.reduce((acc, exportName) => _template.default.expression`EXPORTS.NAME = VALUE`({
    EXPORTS: metadata.exportName,
    NAME: exportName,
    VALUE: acc
  }), initExpr));
}