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node_modules/eslint-plugin-import-x/lib/rules/prefer-default-export.js

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+import { createRule, getValue } from '../utils/index.js';
+export default createRule({
+    name: 'prefer-default-export',
+    meta: {
+        type: 'suggestion',
+        docs: {
+            category: 'Style guide',
+            description: 'Prefer a default export if module exports a single name or multiple names.',
+        },
+        schema: [
+            {
+                type: 'object',
+                properties: {
+                    target: {
+                        type: 'string',
+                        enum: ['single', 'any'],
+                        default: 'single',
+                    },
+                },
+                additionalProperties: false,
+            },
+        ],
+        messages: {
+            single: 'Prefer default export on a file with single export.',
+            any: 'Prefer default export to be present on every file that has export.',
+        },
+    },
+    defaultOptions: [],
+    create(context) {
+        let specifierExportCount = 0;
+        let hasDefaultExport = false;
+        let hasStarExport = false;
+        let hasTypeExport = false;
+        let namedExportNode;
+        const { target = 'single' } = context.options[0] || {};
+        function captureDeclaration(identifierOrPattern) {
+            if (identifierOrPattern?.type === 'ObjectPattern') {
+                for (const property of identifierOrPattern.properties) {
+                    captureDeclaration(property.value);
+                }
+            }
+            else if (identifierOrPattern?.type === 'ArrayPattern') {
+                for (const el of identifierOrPattern.elements) {
+                    captureDeclaration(el);
+                }
+            }
+            else {
+                specifierExportCount++;
+            }
+        }
+        return {
+            ExportDefaultSpecifier() {
+                hasDefaultExport = true;
+            },
+            ExportSpecifier(node) {
+                if (getValue(node.exported) === 'default') {
+                    hasDefaultExport = true;
+                }
+                else {
+                    specifierExportCount++;
+                    namedExportNode = node;
+                }
+            },
+            ExportNamedDeclaration(node) {
+                if (!node.declaration) {
+                    return;
+                }
+                const { type } = node.declaration;
+                if (type === 'TSTypeAliasDeclaration' ||
+                    type === 'TSInterfaceDeclaration' ||
+                    type === 'TypeAlias' ||
+                    type === 'InterfaceDeclaration') {
+                    specifierExportCount++;
+                    hasTypeExport = true;
+                    return;
+                }
+                if ('declarations' in node.declaration &&
+                    node.declaration.declarations) {
+                    for (const declaration of node.declaration.declarations) {
+                        captureDeclaration(declaration.id);
+                    }
+                }
+                else {
+                    specifierExportCount++;
+                }
+                namedExportNode = node;
+            },
+            ExportDefaultDeclaration() {
+                hasDefaultExport = true;
+            },
+            ExportAllDeclaration() {
+                hasStarExport = true;
+            },
+            'Program:exit'() {
+                if (hasDefaultExport || hasStarExport || hasTypeExport) {
+                    return;
+                }
+                if (target === 'single' && specifierExportCount === 1) {
+                    context.report({
+                        node: namedExportNode,
+                        messageId: 'single',
+                    });
+                }
+                else if (target === 'any' && specifierExportCount > 0) {
+                    context.report({
+                        node: namedExportNode,
+                        messageId: 'any',
+                    });
+                }
+            },
+        };
+    },
+});
+//# sourceMappingURL=prefer-default-export.js.map