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/**
* @fileoverview null objects can be created with `ObjectCreate(null)`, or with
* syntax: `{ __proto__: null }`. This linter rule forces use of
* syntax over ObjectCreate.
* @author Jordan Harband <ljharb@gmail.com>
*/
'use strict';
// Cribbed from `eslint-module-utils/declaredScope`
function declaredScope(context, name) {
const references = context.getScope().references;
const reference = references.find((x) => x.identifier.name === name);
if (!reference) return undefined;
return reference.resolved.scope.type;
}
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
fixable: 'code',
messages: {
error: 'Use `{ __proto__: {{value}} }` instead of `ObjectCreate({{value}})` or `Object.create({{value}})`.',
},
},
create(context) {
return {
/* eslint max-len: 0 */
'CallExpression[arguments.length=1]:matches(\
[callee.type="Identifier"][callee.name="ObjectCreate"],\
[callee.type="MemberExpression"][callee.object.name="Object"][callee.property.name="create"]\
)'(node) {
if (node.callee.type === 'MemberExpression') {
const scope = declaredScope(context, node.callee.object);
if (scope && scope !== 'module' && scope !== 'global') {
return;
}
}
const value = context.getSourceCode().getText(node.arguments[0]);
context.report({
node,
messageId: 'error',
data: { value },
fix(fixer) {
return fixer.replaceText(node, `{ __proto__: ${value} }`);
},
});
},
};
},
};
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