index.js 9.8 KB

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  1. "use strict";
  2. Object.defineProperty(exports, "__esModule", {
  3. value: true
  4. });
  5. exports.rewriteModuleStatementsAndPrepareHeader = rewriteModuleStatementsAndPrepareHeader;
  6. exports.ensureStatementsHoisted = ensureStatementsHoisted;
  7. exports.wrapInterop = wrapInterop;
  8. exports.buildNamespaceInitStatements = buildNamespaceInitStatements;
  9. Object.defineProperty(exports, "isModule", {
  10. enumerable: true,
  11. get: function () {
  12. return _helperModuleImports.isModule;
  13. }
  14. });
  15. Object.defineProperty(exports, "rewriteThis", {
  16. enumerable: true,
  17. get: function () {
  18. return _rewriteThis.default;
  19. }
  20. });
  21. Object.defineProperty(exports, "hasExports", {
  22. enumerable: true,
  23. get: function () {
  24. return _normalizeAndLoadMetadata.hasExports;
  25. }
  26. });
  27. Object.defineProperty(exports, "isSideEffectImport", {
  28. enumerable: true,
  29. get: function () {
  30. return _normalizeAndLoadMetadata.isSideEffectImport;
  31. }
  32. });
  33. Object.defineProperty(exports, "getModuleName", {
  34. enumerable: true,
  35. get: function () {
  36. return _getModuleName.default;
  37. }
  38. });
  39. var _assert = _interopRequireDefault(require("assert"));
  40. var t = _interopRequireWildcard(require("@babel/types"));
  41. var _template = _interopRequireDefault(require("@babel/template"));
  42. var _chunk = _interopRequireDefault(require("lodash/chunk"));
  43. var _helperModuleImports = require("@babel/helper-module-imports");
  44. var _rewriteThis = _interopRequireDefault(require("./rewrite-this"));
  45. var _rewriteLiveReferences = _interopRequireDefault(require("./rewrite-live-references"));
  46. var _normalizeAndLoadMetadata = _interopRequireWildcard(require("./normalize-and-load-metadata"));
  47. var _getModuleName = _interopRequireDefault(require("./get-module-name"));
  48. function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
  49. 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; }
  50. function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  51. function rewriteModuleStatementsAndPrepareHeader(path, {
  52. exportName,
  53. strict,
  54. allowTopLevelThis,
  55. strictMode,
  56. loose,
  57. noInterop,
  58. lazy,
  59. esNamespaceOnly
  60. }) {
  61. (0, _assert.default)((0, _helperModuleImports.isModule)(path), "Cannot process module statements in a script");
  62. path.node.sourceType = "script";
  63. const meta = (0, _normalizeAndLoadMetadata.default)(path, exportName, {
  64. noInterop,
  65. loose,
  66. lazy,
  67. esNamespaceOnly
  68. });
  69. if (!allowTopLevelThis) {
  70. (0, _rewriteThis.default)(path);
  71. }
  72. (0, _rewriteLiveReferences.default)(path, meta);
  73. if (strictMode !== false) {
  74. const hasStrict = path.node.directives.some(directive => {
  75. return directive.value.value === "use strict";
  76. });
  77. if (!hasStrict) {
  78. path.unshiftContainer("directives", t.directive(t.directiveLiteral("use strict")));
  79. }
  80. }
  81. const headers = [];
  82. if ((0, _normalizeAndLoadMetadata.hasExports)(meta) && !strict) {
  83. headers.push(buildESModuleHeader(meta, loose));
  84. }
  85. const nameList = buildExportNameListDeclaration(path, meta);
  86. if (nameList) {
  87. meta.exportNameListName = nameList.name;
  88. headers.push(nameList.statement);
  89. }
  90. headers.push(...buildExportInitializationStatements(path, meta, loose));
  91. return {
  92. meta,
  93. headers
  94. };
  95. }
  96. function ensureStatementsHoisted(statements) {
  97. statements.forEach(header => {
  98. header._blockHoist = 3;
  99. });
  100. }
  101. function wrapInterop(programPath, expr, type) {
  102. if (type === "none") {
  103. return null;
  104. }
  105. let helper;
  106. if (type === "default") {
  107. helper = "interopRequireDefault";
  108. } else if (type === "namespace") {
  109. helper = "interopRequireWildcard";
  110. } else {
  111. throw new Error(`Unknown interop: ${type}`);
  112. }
  113. return t.callExpression(programPath.hub.addHelper(helper), [expr]);
  114. }
  115. function buildNamespaceInitStatements(metadata, sourceMetadata, loose = false) {
  116. const statements = [];
  117. let srcNamespace = t.identifier(sourceMetadata.name);
  118. if (sourceMetadata.lazy) srcNamespace = t.callExpression(srcNamespace, []);
  119. for (const localName of sourceMetadata.importsNamespace) {
  120. if (localName === sourceMetadata.name) continue;
  121. statements.push(_template.default.statement`var NAME = SOURCE;`({
  122. NAME: localName,
  123. SOURCE: t.cloneNode(srcNamespace)
  124. }));
  125. }
  126. if (loose) {
  127. statements.push(...buildReexportsFromMeta(metadata, sourceMetadata, loose));
  128. }
  129. for (const exportName of sourceMetadata.reexportNamespace) {
  130. statements.push((sourceMetadata.lazy ? _template.default.statement`
  131. Object.defineProperty(EXPORTS, "NAME", {
  132. enumerable: true,
  133. get: function() {
  134. return NAMESPACE;
  135. }
  136. });
  137. ` : _template.default.statement`EXPORTS.NAME = NAMESPACE;`)({
  138. EXPORTS: metadata.exportName,
  139. NAME: exportName,
  140. NAMESPACE: t.cloneNode(srcNamespace)
  141. }));
  142. }
  143. if (sourceMetadata.reexportAll) {
  144. const statement = buildNamespaceReexport(metadata, t.cloneNode(srcNamespace), loose);
  145. statement.loc = sourceMetadata.reexportAll.loc;
  146. statements.push(statement);
  147. }
  148. return statements;
  149. }
  150. const getTemplateForReexport = loose => {
  151. return loose ? _template.default.statement`EXPORTS.EXPORT_NAME = NAMESPACE.IMPORT_NAME;` : (0, _template.default)`
  152. Object.defineProperty(EXPORTS, "EXPORT_NAME", {
  153. enumerable: true,
  154. get: function() {
  155. return NAMESPACE.IMPORT_NAME;
  156. },
  157. });
  158. `;
  159. };
  160. const buildReexportsFromMeta = (meta, metadata, loose) => {
  161. const namespace = metadata.lazy ? t.callExpression(t.identifier(metadata.name), []) : t.identifier(metadata.name);
  162. const templateForCurrentMode = getTemplateForReexport(loose);
  163. return Array.from(metadata.reexports, ([exportName, importName]) => templateForCurrentMode({
  164. EXPORTS: meta.exportName,
  165. EXPORT_NAME: exportName,
  166. NAMESPACE: t.cloneNode(namespace),
  167. IMPORT_NAME: importName
  168. }));
  169. };
  170. function buildESModuleHeader(metadata, enumerable = false) {
  171. return (enumerable ? _template.default.statement`
  172. EXPORTS.__esModule = true;
  173. ` : _template.default.statement`
  174. Object.defineProperty(EXPORTS, "__esModule", {
  175. value: true,
  176. });
  177. `)({
  178. EXPORTS: metadata.exportName
  179. });
  180. }
  181. function buildNamespaceReexport(metadata, namespace, loose) {
  182. return (loose ? _template.default.statement`
  183. Object.keys(NAMESPACE).forEach(function(key) {
  184. if (key === "default" || key === "__esModule") return;
  185. VERIFY_NAME_LIST;
  186. EXPORTS[key] = NAMESPACE[key];
  187. });
  188. ` : _template.default.statement`
  189. Object.keys(NAMESPACE).forEach(function(key) {
  190. if (key === "default" || key === "__esModule") return;
  191. VERIFY_NAME_LIST;
  192. Object.defineProperty(EXPORTS, key, {
  193. enumerable: true,
  194. get: function() {
  195. return NAMESPACE[key];
  196. },
  197. });
  198. });
  199. `)({
  200. NAMESPACE: namespace,
  201. EXPORTS: metadata.exportName,
  202. VERIFY_NAME_LIST: metadata.exportNameListName ? (0, _template.default)`
  203. if (Object.prototype.hasOwnProperty.call(EXPORTS_LIST, key)) return;
  204. `({
  205. EXPORTS_LIST: metadata.exportNameListName
  206. }) : null
  207. });
  208. }
  209. function buildExportNameListDeclaration(programPath, metadata) {
  210. const exportedVars = Object.create(null);
  211. for (const data of metadata.local.values()) {
  212. for (const name of data.names) {
  213. exportedVars[name] = true;
  214. }
  215. }
  216. let hasReexport = false;
  217. for (const data of metadata.source.values()) {
  218. for (const exportName of data.reexports.keys()) {
  219. exportedVars[exportName] = true;
  220. }
  221. for (const exportName of data.reexportNamespace) {
  222. exportedVars[exportName] = true;
  223. }
  224. hasReexport = hasReexport || data.reexportAll;
  225. }
  226. if (!hasReexport || Object.keys(exportedVars).length === 0) return null;
  227. const name = programPath.scope.generateUidIdentifier("exportNames");
  228. delete exportedVars.default;
  229. return {
  230. name: name.name,
  231. statement: t.variableDeclaration("var", [t.variableDeclarator(name, t.valueToNode(exportedVars))])
  232. };
  233. }
  234. function buildExportInitializationStatements(programPath, metadata, loose = false) {
  235. const initStatements = [];
  236. const exportNames = [];
  237. for (const [localName, data] of metadata.local) {
  238. if (data.kind === "import") {} else if (data.kind === "hoisted") {
  239. initStatements.push(buildInitStatement(metadata, data.names, t.identifier(localName)));
  240. } else {
  241. exportNames.push(...data.names);
  242. }
  243. }
  244. for (const data of metadata.source.values()) {
  245. if (!loose) {
  246. initStatements.push(...buildReexportsFromMeta(metadata, data, loose));
  247. }
  248. for (const exportName of data.reexportNamespace) {
  249. exportNames.push(exportName);
  250. }
  251. }
  252. initStatements.push(...(0, _chunk.default)(exportNames, 100).map(members => {
  253. return buildInitStatement(metadata, members, programPath.scope.buildUndefinedNode());
  254. }));
  255. return initStatements;
  256. }
  257. function buildInitStatement(metadata, exportNames, initExpr) {
  258. return t.expressionStatement(exportNames.reduce((acc, exportName) => _template.default.expression`EXPORTS.NAME = VALUE`({
  259. EXPORTS: metadata.exportName,
  260. NAME: exportName,
  261. VALUE: acc
  262. }), initExpr));
  263. }