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no-mutable-exports.js
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no-mutable-exports.js
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import docsUrl from '../docsUrl'
module.exports = {
meta: {
type: 'suggestion',
docs: {
url: docsUrl('no-mutable-exports'),
},
},
create: function (context) {
function checkDeclaration(node) {
const {kind} = node
if (kind === 'var' || kind === 'let') {
context.report(node, `Exporting mutable '${kind}' binding, use 'const' instead.`)
}
}
function checkDeclarationsInScope({variables}, name) {
for (let variable of variables) {
if (variable.name === name) {
for (let def of variable.defs) {
if (def.type === 'Variable' && def.parent) {
checkDeclaration(def.parent)
}
}
}
}
}
function handleExportDefault(node) {
const scope = context.getScope()
if (node.declaration.name) {
checkDeclarationsInScope(scope, node.declaration.name)
}
}
function handleExportNamed(node) {
const scope = context.getScope()
if (node.declaration) {
checkDeclaration(node.declaration)
} else if (!node.source) {
for (let specifier of node.specifiers) {
checkDeclarationsInScope(scope, specifier.local.name)
}
}
}
return {
'ExportDefaultDeclaration': handleExportDefault,
'ExportNamedDeclaration': handleExportNamed,
}
},
}