/
no-empty-interface.ts
69 lines (66 loc) · 1.65 KB
/
no-empty-interface.ts
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import * as util from '../util';
type Options = [
{
allowSingleExtends?: boolean;
}
];
type MessageIds = 'noEmpty' | 'noEmptyWithSuper';
export default util.createRule<Options, MessageIds>({
name: 'no-empty-interface',
meta: {
type: 'suggestion',
docs: {
description: 'Disallow the declaration of empty interfaces',
tslintRuleName: 'no-empty-interface',
category: 'Best Practices',
recommended: 'error',
},
messages: {
noEmpty: 'An empty interface is equivalent to `{}`.',
noEmptyWithSuper:
'An interface declaring no members is equivalent to its supertype.',
},
schema: [
{
type: 'object',
additionalProperties: false,
properties: {
allowSingleExtends: {
type: 'boolean',
},
},
},
],
},
defaultOptions: [
{
allowSingleExtends: false,
},
],
create(context, [{ allowSingleExtends }]) {
return {
TSInterfaceDeclaration(node) {
if (node.body.body.length !== 0) {
// interface contains members --> Nothing to report
return;
}
if (!node.extends || node.extends.length === 0) {
context.report({
node: node.id,
messageId: 'noEmpty',
});
} else if (node.extends.length === 1) {
// interface extends exactly 1 interface --> Report depending on rule setting
if (allowSingleExtends) {
return;
} else {
context.report({
node: node.id,
messageId: 'noEmptyWithSuper',
});
}
}
},
};
},
});