116 lines
12 KiB
JavaScript
116 lines
12 KiB
JavaScript
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'use strict';
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var _docsUrl = require('../docsUrl');var _docsUrl2 = _interopRequireDefault(_docsUrl);function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { 'default': obj };}
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var SINGLE_EXPORT_ERROR_MESSAGE = 'Prefer default export on a file with single export.';
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var ANY_EXPORT_ERROR_MESSAGE = 'Prefer default export to be present on every file that has export.';
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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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category: 'Style guide',
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description: 'Prefer a default export if module exports a single name or multiple names.',
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url: (0, _docsUrl2['default'])('prefer-default-export') },
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schema: [{
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type: 'object',
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properties: {
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target: {
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type: 'string',
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'enum': ['single', 'any'],
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'default': 'single' } },
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additionalProperties: false }] },
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create: function () {function create(context) {
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var specifierExportCount = 0;
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var hasDefaultExport = false;
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var hasStarExport = false;
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var hasTypeExport = false;
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var namedExportNode = null;
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// get options. by default we look into files with single export
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var _ref = context.options[0] || {},_ref$target = _ref.target,target = _ref$target === undefined ? 'single' : _ref$target;
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function captureDeclaration(identifierOrPattern) {
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if (identifierOrPattern && identifierOrPattern.type === 'ObjectPattern') {
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// recursively capture
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identifierOrPattern.properties.
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forEach(function (property) {
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captureDeclaration(property.value);
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});
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} else if (identifierOrPattern && identifierOrPattern.type === 'ArrayPattern') {
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identifierOrPattern.elements.
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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 () {function ExportDefaultSpecifier() {
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hasDefaultExport = true;
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}return ExportDefaultSpecifier;}(),
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ExportSpecifier: function () {function ExportSpecifier(node) {
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if ((node.exported.name || node.exported.value) === '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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}return ExportSpecifier;}(),
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ExportNamedDeclaration: function () {function ExportNamedDeclaration(node) {
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// if there are specifiers, node.declaration should be null
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if (!node.declaration) {return;}var
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type = node.declaration.type;
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if (
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type === 'TSTypeAliasDeclaration' ||
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type === 'TypeAlias' ||
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type === 'TSInterfaceDeclaration' ||
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type === 'InterfaceDeclaration')
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{
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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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}return ExportNamedDeclaration;}(),
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ExportDefaultDeclaration: function () {function ExportDefaultDeclaration() {
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hasDefaultExport = true;
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}return ExportDefaultDeclaration;}(),
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ExportAllDeclaration: function () {function ExportAllDeclaration() {
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hasStarExport = true;
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}return ExportAllDeclaration;}(),
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'Program:exit': function () {function ProgramExit() {
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if (hasDefaultExport || hasStarExport || hasTypeExport) {
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return;
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}
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if (target === 'single' && specifierExportCount === 1) {
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context.report(namedExportNode, SINGLE_EXPORT_ERROR_MESSAGE);
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} else if (target === 'any' && specifierExportCount > 0) {
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context.report(namedExportNode, ANY_EXPORT_ERROR_MESSAGE);
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}
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}return ProgramExit;}() };
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}return create;}() };
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