prefer-default-export.js
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'use strict';
module.exports = {
meta: {
docs: {}
},
create: function (context) {
let specifierExportCount = 0;
let hasDefaultExport = false;
let hasStarExport = false;
let namedExportNode = null;
function captureDeclaration(identifierOrPattern) {
if (identifierOrPattern.type === 'ObjectPattern') {
// recursively capture
identifierOrPattern.properties.forEach(function (property) {
captureDeclaration(property.value);
});
} else {
// assume it's a single standard identifier
specifierExportCount++;
}
}
return {
'ExportDefaultSpecifier': function () {
hasDefaultExport = true;
},
'ExportSpecifier': function (node) {
if (node.exported.name === 'default') {
hasDefaultExport = true;
} else {
specifierExportCount++;
namedExportNode = node;
}
},
'ExportNamedDeclaration': function (node) {
// if there are specifiers, node.declaration should be null
if (!node.declaration) return;
// don't count flow types exports
if (node.exportKind === 'type') return;
if (node.declaration.declarations) {
node.declaration.declarations.forEach(function (declaration) {
captureDeclaration(declaration.id);
});
} else {
// captures 'export function foo() {}' syntax
specifierExportCount++;
}
namedExportNode = node;
},
'ExportDefaultDeclaration': function () {
hasDefaultExport = true;
},
'ExportAllDeclaration': function () {
hasStarExport = true;
},
'Program:exit': function () {
if (specifierExportCount === 1 && !hasDefaultExport && !hasStarExport) {
context.report(namedExportNode, 'Prefer default export.');
}
}
};
}
};
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