/
no-unnecessary-type-arguments.test.ts
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/
no-unnecessary-type-arguments.test.ts
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import rule from '../../src/rules/no-unnecessary-type-arguments';
import { RuleTester, getFixturesRootDir } from '../RuleTester';
const rootPath = getFixturesRootDir();
const ruleTester = new RuleTester({
parser: '@typescript-eslint/parser',
parserOptions: {
sourceType: 'module',
tsconfigRootDir: rootPath,
project: './tsconfig.json',
},
});
ruleTester.run('no-unnecessary-type-arguments', rule, {
valid: [
`f<>();`,
`f<string>();`,
`expect().toBe<>();`,
`class Foo extends Bar<> {}`,
`class Foo extends Bar<string> {}`,
`class Foo implements Bar<> {}`,
`class Foo implements Bar<string> {}`,
`function f<T = number>() { }
f();`,
`function f<T = number>() { }
f<string>();`,
`declare const f: (<T = number>() => void) | null;
f?.();`,
`declare const f: (<T = number>() => void) | null;
f?.<string>();`,
`declare const f: any;
f();`,
`declare const f: any;
f<string>();`,
`declare const f: unknown;
f();`,
`declare const f: unknown;
f<string>();`,
`function g<T = number, U = string>() { }
g<number, number>();`,
`declare const g: any;
g<string, string>();`,
`declare const g: unknown;
g<string, string>();`,
`class C<T = number> { }
new C<string>();`,
`declare const C: any;
new C<string>();`,
`declare const C: unknown;
new C<string>();`,
`class C<T = number> { }
class D extends C<string> { }`,
`declare const C: any;
class D extends C<string> { }`,
`declare const C: unknown;
class D extends C<string> { }`,
`interface I<T = number> { }
class Impl implements I<string> { }`,
`class C<TC = number> { }
class D<TD = number> extends C { }`,
`declare const C: any;
class D<TD = number> extends C { }`,
`declare const C: unknown;
class D<TD = number> extends C { }`,
`let a: A<number>`,
`class Foo<T> {}
const foo = new Foo<number>();`,
`type Foo<T> = import('foo').Foo<T>;`,
`class Bar<T = number> {}
class Foo<T = number> extends Bar<T> {}`,
`interface Bar<T = number> {}
class Foo<T = number> implements Bar<T> {}`,
`class Bar<T = number> {}
class Foo<T = number> extends Bar<string> {}`,
`interface Bar<T = number> {}
class Foo<T = number> implements Bar<string> {}`,
`import { F } from './missing';
function bar<T = F>() {}
bar<F<number>>()`,
],
invalid: [
{
code: `function f<T = number>() { }
f<number>();`,
errors: [
{
column: 11,
messageId: 'unnecessaryTypeParameter',
},
],
output: `function f<T = number>() { }
f();`,
},
{
code: `function g<T = number, U = string>() { }
g<string, string>();`,
errors: [
{
column: 19,
messageId: 'unnecessaryTypeParameter',
},
],
output: `function g<T = number, U = string>() { }
g<string>();`,
},
{
code: `class C<T = number> { }
function h(c: C<number>) { }`,
errors: [
{
messageId: 'unnecessaryTypeParameter',
},
],
output: `class C<T = number> { }
function h(c: C) { }`,
},
{
code: `class C<T = number> { }
new C<number>();`,
errors: [
{
messageId: 'unnecessaryTypeParameter',
},
],
output: `class C<T = number> { }
new C();`,
},
{
code: `class C<T = number> { }
class D extends C<number> { }`,
errors: [
{
messageId: 'unnecessaryTypeParameter',
},
],
output: `class C<T = number> { }
class D extends C { }`,
},
{
code: `interface I<T = number> { }
class Impl implements I<number> { }`,
errors: [
{
messageId: 'unnecessaryTypeParameter',
},
],
output: `interface I<T = number> { }
class Impl implements I { }`,
},
{
code: `class Foo<T = number> {}
const foo = new Foo<number>();`,
errors: [
{
messageId: 'unnecessaryTypeParameter',
},
],
output: `class Foo<T = number> {}
const foo = new Foo();`,
},
{
code: `interface Bar<T = string> {}
class Foo<T = number> implements Bar<string> {}`,
errors: [
{
messageId: 'unnecessaryTypeParameter',
},
],
output: `interface Bar<T = string> {}
class Foo<T = number> implements Bar {}`,
},
{
code: `class Bar<T = string> {}
class Foo<T = number> extends Bar<string> {}`,
errors: [
{
messageId: 'unnecessaryTypeParameter',
},
],
output: `class Bar<T = string> {}
class Foo<T = number> extends Bar {}`,
},
{
code: `import { F } from './missing';
function bar<T = F<string>>() {}
bar<F<string>>()`,
errors: [
{
line: 3,
column: 13,
messageId: 'unnecessaryTypeParameter',
},
],
output: `import { F } from './missing';
function bar<T = F<string>>() {}
bar()`,
},
],
});