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no-useless-fragment.spec.ts
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import { AST_NODE_TYPES } from "@typescript-eslint/types";
import { allValid, ruleTester } from "../../../../../test";
import rule, { RULE_NAME } from "./no-useless-fragment";
ruleTester.run(RULE_NAME, rule, {
invalid: [
{
code: /* tsx */ `<></>`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" }],
},
{
code: /* tsx */ `<p><>foo</></p>`,
errors: [
{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragmentInBuiltIn" },
{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" },
],
},
{
code: /* tsx */ `<p>moo<>foo</></p>`,
errors: [
{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragmentInBuiltIn" },
{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" },
],
},
{
code: /* tsx */ `<p><>{meow}</></p>`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragmentInBuiltIn" }],
},
{
code: /* tsx */ `<><div/></>`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" }],
},
{
code: /* tsx */ `
<>
<div/>
</>
`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" }],
},
{
code: /* tsx */ `<Fragment />`,
errors: [{ type: AST_NODE_TYPES.JSXElement, messageId: "noUselessFragment" }],
},
{
code: /* tsx */ `
<React.Fragment>
<Foo />
</React.Fragment>
`,
errors: [{ type: AST_NODE_TYPES.JSXElement, messageId: "noUselessFragment" }],
},
{
code: /* tsx */ `<Eeee><>foo</></Eeee>`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" }],
},
{
code: /* tsx */ `<div><>foo</></div>`,
errors: [
{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragmentInBuiltIn" },
{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" },
],
},
{
code: '<div><>{"a"}{"b"}</></div>',
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragmentInBuiltIn" }],
},
{
code: /* tsx */ `
<section>
<Eeee />
<Eeee />
<>{"a"}{"b"}</>
</section>
`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragmentInBuiltIn" }],
},
{
code: '<div><Fragment>{"a"}{"b"}</Fragment></div>',
errors: [{ type: AST_NODE_TYPES.JSXElement, messageId: "noUselessFragmentInBuiltIn" }],
},
{
// whitepace tricky case
code: /* tsx */ `
<section>
git<>
<b>hub</b>.
</>
git<> <b>hub</b></>
</section>
`,
errors: [
{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragmentInBuiltIn" },
{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragmentInBuiltIn" },
],
},
{
code: '<div>a <>{""}{""}</> a</div>',
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragmentInBuiltIn" }],
},
{
code: /* tsx */ `
const Comp = () => (
<html>
<React.Fragment />
</html>
);
`,
errors: [
{ type: AST_NODE_TYPES.JSXElement, messageId: "noUselessFragmentInBuiltIn" },
{ type: AST_NODE_TYPES.JSXElement, messageId: "noUselessFragment" },
],
},
// Ensure allowExpressions still catches expected violations
{
code: /* tsx */ `<><Foo>{moo}</Foo></>`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" }],
},
{
code: /* tsx */ `<>{moo}</>`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" }],
options: [{ allowExpressions: false }],
},
{
code: /* tsx */ `<Foo><>{moo}</></Foo>`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" }],
options: [{ allowExpressions: false }],
},
{
code: /* tsx */ `<React.Fragment><>{moo}</></React.Fragment>`,
errors: [{ type: AST_NODE_TYPES.JSXElement, messageId: "noUselessFragment" }, {
type: AST_NODE_TYPES.JSXFragment,
messageId: "noUselessFragment",
}],
options: [{ allowExpressions: false }],
},
{
code: /* tsx */ `<Foo bar={<>baz</>}/>`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" }],
options: [{ allowExpressions: false }],
},
{
code: /* tsx */ `<Foo><><Bar/><Baz/></></Foo>`,
errors: [{ type: AST_NODE_TYPES.JSXFragment, messageId: "noUselessFragment" }],
options: [{ allowExpressions: false }],
},
],
valid: [
...allValid,
"<><Foo /><Bar /></>",
"<>foo<div /></>",
"<> <div /></>",
'<>{"moo"} </>',
"<NotFragment />",
"<React.NotFragment />",
"<Foo><><div /><div /></></Foo>",
'<div p={<>{"a"}{"b"}</>} />',
"<Fragment key={item.id}>{item.value}</Fragment>",
"<Fooo content={<>eeee ee eeeeeee eeeeeeee</>} />",
"<>{foos.map(foo => foo)}</>",
"<>{moo}</>",
/* tsx */ `
<>
{moo}
</>
`,
/* tsx */ `
<>{children}</>
`,
/* tsx */ `
<>{props.children}</>
`,
/* tsx */ `
<>
{children}
{moo}
</>
`,
/* tsx */ `
<>
{props.children}
{moo}
</>
`,
/* tsx */ `<>{cloneElement(children, { ref: childrenRef })}</>`,
{
code: /* tsx */ `
<React.SomeFragment>
{<Foo />}
</React.SomeFragment>
`,
settings: {
"react-x": {
jsxPragma: "SomeReact",
jsxPragmaFrag: "SomeFragment",
},
},
},
{
code: /* tsx */ `<NotReact.Fragment />`,
settings: {
"react-x": {
strictImportCheck: true,
},
},
},
{
code: /* tsx */ `{foo}`,
options: [{ allowExpressions: false }],
},
{
code: /* tsx */ `<Foo bar={<><Bar/><Baz/></>} />`,
options: [{ allowExpressions: false }],
},
],
});