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no-unsafe-declaration-merging.test.ts
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no-unsafe-declaration-merging.test.ts
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import rule from '../../src/rules/no-unsafe-declaration-merging';
import { getFixturesRootDir, RuleTester } from '../RuleTester';
const rootPath = getFixturesRootDir();
const ruleTester = new RuleTester({
parser: '@typescript-eslint/parser',
parserOptions: {
sourceType: 'module',
tsconfigRootDir: rootPath,
project: './tsconfig.json',
},
});
ruleTester.run('no-unsafe-declaration-merging', rule, {
valid: [
`
interface Foo {}
class Bar implements Foo {}
`,
`
namespace Foo {}
namespace Foo {}
`,
`
enum Foo {}
namespace Foo {}
`,
`
namespace Fooo {}
function Foo() {}
`,
`
const Foo = class {};
`,
`
interface Foo {
props: string;
}
function bar() {
return class Foo {};
}
`,
`
interface Foo {
props: string;
}
(function bar() {
class Foo {}
})();
`,
`
declare global {
interface Foo {}
}
class Foo {}
`,
],
invalid: [
{
code: `
interface Foo {}
class Foo {}
`,
errors: [
{
messageId: 'unsafeMerging',
line: 2,
column: 11,
},
{
messageId: 'unsafeMerging',
line: 3,
column: 7,
},
],
},
{
code: `
namespace Foo {
export interface Bar {}
}
namespace Foo {
export class Bar {}
}
`,
errors: [
{
messageId: 'unsafeMerging',
line: 3,
column: 20,
},
{
messageId: 'unsafeMerging',
line: 6,
column: 16,
},
],
},
{
code: `
declare global {
interface Foo {}
class Foo {}
}
`,
errors: [
{
messageId: 'unsafeMerging',
line: 3,
column: 13,
},
{
messageId: 'unsafeMerging',
line: 4,
column: 9,
},
],
},
],
});