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no-useless-empty-export.test.ts
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no-useless-empty-export.test.ts
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/* eslint-disable eslint-comments/no-use */
// this rule tests the spacing, which prettier will want to fix and break the tests
/* eslint "@typescript-eslint/internal/plugin-test-formatting": ["error", { formatWithPrettier: false }] */
/* eslint-enable eslint-comments/no-use */
import rule from '../../src/rules/no-useless-empty-export';
import { RuleTester } from '../RuleTester';
const ruleTester = new RuleTester({
parserOptions: {
ecmaVersion: 2020,
sourceType: 'module',
},
parser: '@typescript-eslint/parser',
});
const error = {
messageId: 'uselessExport',
} as const;
ruleTester.run('no-useless-empty-export', rule, {
valid: [
"declare module '_'",
"import {} from '_';",
"import * as _ from '_';",
'export = {};',
'export = 3;',
'export const _ = {};',
`
const _ = {};
export default _;
`,
`
export * from '_';
export = {};
`,
`
export {};
`,
],
invalid: [
{
code: `
export const _ = {};
export {};
`,
errors: [error],
output: `
export const _ = {};
`,
},
{
code: `
export * from '_';
export {};
`,
errors: [error],
output: `
export * from '_';
`,
},
{
code: `
export {};
export * from '_';
`,
errors: [error],
output: `
export * from '_';
`,
},
{
code: `
const _ = {};
export default _;
export {};
`,
errors: [error],
output: `
const _ = {};
export default _;
`,
},
{
code: `
export {};
const _ = {};
export default _;
`,
errors: [error],
output: `
const _ = {};
export default _;
`,
},
{
code: `
const _ = {};
export { _ };
export {};
`,
errors: [error],
output: `
const _ = {};
export { _ };
`,
},
{
code: `
import _ = require('_');
export {};
`,
errors: [error],
output: `
import _ = require('_');
`,
},
],
});