react-scripts
Version:
Configuration and scripts for Create React App.
62 lines (53 loc) • 5.61 kB
JavaScript
;
module.exports = function (context) {
var specifierExportCount = 0;
var hasDefaultExport = false;
var hasStarExport = false;
var namedExportNode = null;
return {
'ExportSpecifier': function ExportSpecifier(node) {
if (node.exported.name === 'default') {
hasDefaultExport = true;
} else {
specifierExportCount++;
namedExportNode = node;
}
},
'ExportNamedDeclaration': function ExportNamedDeclaration(node) {
// if there are specifiers, node.declaration should be null
if (!node.declaration) return;
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++;
}
}
if (node.declaration.declarations) {
node.declaration.declarations.forEach(function (declaration) {
captureDeclaration(declaration.id);
});
} else {
// captures 'export function foo() {}' syntax
specifierExportCount++;
}
namedExportNode = node;
},
'ExportDefaultDeclaration': function ExportDefaultDeclaration() {
hasDefaultExport = true;
},
'ExportAllDeclaration': function ExportAllDeclaration() {
hasStarExport = true;
},
'Program:exit': function ProgramExit() {
if (specifierExportCount === 1 && !hasDefaultExport && !hasStarExport) {
context.report(namedExportNode, 'Prefer default export.');
}
}
};
};
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