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62 lines
3.0 KiB
62 lines
3.0 KiB
4 years ago
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = splitExportDeclaration;
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var t = _interopRequireWildcard(require("@babel/types"));
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function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
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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; }
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function splitExportDeclaration(exportDeclaration) {
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if (!exportDeclaration.isExportDeclaration()) {
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throw new Error("Only export declarations can be split.");
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}
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const isDefault = exportDeclaration.isExportDefaultDeclaration();
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const declaration = exportDeclaration.get("declaration");
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const isClassDeclaration = declaration.isClassDeclaration();
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if (isDefault) {
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const standaloneDeclaration = declaration.isFunctionDeclaration() || isClassDeclaration;
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const scope = declaration.isScope() ? declaration.scope.parent : declaration.scope;
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let id = declaration.node.id;
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let needBindingRegistration = false;
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if (!id) {
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needBindingRegistration = true;
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id = scope.generateUidIdentifier("default");
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if (standaloneDeclaration || declaration.isFunctionExpression() || declaration.isClassExpression()) {
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declaration.node.id = t.cloneNode(id);
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}
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}
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const updatedDeclaration = standaloneDeclaration ? declaration : t.variableDeclaration("var", [t.variableDeclarator(t.cloneNode(id), declaration.node)]);
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const updatedExportDeclaration = t.exportNamedDeclaration(null, [t.exportSpecifier(t.cloneNode(id), t.identifier("default"))]);
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exportDeclaration.insertAfter(updatedExportDeclaration);
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exportDeclaration.replaceWith(updatedDeclaration);
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if (needBindingRegistration) {
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scope.registerDeclaration(exportDeclaration);
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}
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return exportDeclaration;
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}
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if (exportDeclaration.get("specifiers").length > 0) {
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throw new Error("It doesn't make sense to split exported specifiers.");
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}
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const bindingIdentifiers = declaration.getOuterBindingIdentifiers();
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const specifiers = Object.keys(bindingIdentifiers).map(name => {
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return t.exportSpecifier(t.identifier(name), t.identifier(name));
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});
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const aliasDeclar = t.exportNamedDeclaration(null, specifiers);
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exportDeclaration.insertAfter(aliasDeclar);
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exportDeclaration.replaceWith(declaration.node);
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return exportDeclaration;
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}
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