93 lines
8.5 KiB
JavaScript
93 lines
8.5 KiB
JavaScript
'use strict';
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var _docsUrl = require('../docsUrl');
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var _docsUrl2 = _interopRequireDefault(_docsUrl);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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module.exports = {
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meta: {
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type: 'suggestion',
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docs: {
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url: (0, _docsUrl2.default)('prefer-default-export')
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}
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},
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create: function (context) {
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let specifierExportCount = 0;
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let hasDefaultExport = false;
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let hasStarExport = false;
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let hasTypeExport = false;
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let namedExportNode = null;
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function captureDeclaration(identifierOrPattern) {
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if (identifierOrPattern.type === 'ObjectPattern') {
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// recursively capture
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identifierOrPattern.properties.forEach(function (property) {
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captureDeclaration(property.value);
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});
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} else if (identifierOrPattern.type === 'ArrayPattern') {
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identifierOrPattern.elements.forEach(captureDeclaration);
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} else {
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// assume it's a single standard identifier
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specifierExportCount++;
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}
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}
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return {
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'ExportDefaultSpecifier': function () {
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hasDefaultExport = true;
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},
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'ExportSpecifier': function (node) {
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if (node.exported.name === 'default') {
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hasDefaultExport = true;
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} else {
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specifierExportCount++;
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namedExportNode = node;
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}
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},
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'ExportNamedDeclaration': function (node) {
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// if there are specifiers, node.declaration should be null
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if (!node.declaration) return;
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const type = node.declaration.type;
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if (type === 'TSTypeAliasDeclaration' || type === 'TypeAlias' || type === 'TSInterfaceDeclaration' || type === 'InterfaceDeclaration') {
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specifierExportCount++;
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hasTypeExport = true;
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return;
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}
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if (node.declaration.declarations) {
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node.declaration.declarations.forEach(function (declaration) {
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captureDeclaration(declaration.id);
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});
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} else {
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// captures 'export function foo() {}' syntax
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specifierExportCount++;
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}
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namedExportNode = node;
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},
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'ExportDefaultDeclaration': function () {
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hasDefaultExport = true;
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},
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'ExportAllDeclaration': function () {
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hasStarExport = true;
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},
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'Program:exit': function () {
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if (specifierExportCount === 1 && !hasDefaultExport && !hasStarExport && !hasTypeExport) {
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context.report(namedExportNode, 'Prefer default export.');
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}
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}
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};
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}
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};
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