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prefer-optional-chain.test.ts
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prefer-optional-chain.test.ts
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import type { TSESLint } from '@typescript-eslint/utils';
import rule from '../../src/rules/prefer-optional-chain';
import type {
InferMessageIdsTypeFromRule,
InferOptionsTypeFromRule,
} from '../../src/util';
import { noFormat, RuleTester } from '../RuleTester';
const ruleTester = new RuleTester({
parser: '@typescript-eslint/parser',
});
const baseCases = [
// chained members
{
code: 'foo && foo.bar',
output: 'foo?.bar',
},
{
code: 'foo.bar && foo.bar.baz',
output: 'foo.bar?.baz',
},
{
code: 'foo && foo()',
output: 'foo?.()',
},
{
code: 'foo.bar && foo.bar()',
output: 'foo.bar?.()',
},
{
code: 'foo && foo.bar && foo.bar.baz && foo.bar.baz.buzz',
output: 'foo?.bar?.baz?.buzz',
},
{
code: 'foo.bar && foo.bar.baz && foo.bar.baz.buzz',
output: 'foo.bar?.baz?.buzz',
},
// case with a jump (i.e. a non-nullish prop)
{
code: 'foo && foo.bar && foo.bar.baz.buzz',
output: 'foo?.bar?.baz.buzz',
},
{
code: 'foo.bar && foo.bar.baz.buzz',
output: 'foo.bar?.baz.buzz',
},
// case where for some reason there is a doubled up expression
{
code: 'foo && foo.bar && foo.bar.baz && foo.bar.baz && foo.bar.baz.buzz',
output: 'foo?.bar?.baz?.buzz',
},
{
code: 'foo.bar && foo.bar.baz && foo.bar.baz && foo.bar.baz.buzz',
output: 'foo.bar?.baz?.buzz',
},
// chained members with element access
{
code: 'foo && foo[bar] && foo[bar].baz && foo[bar].baz.buzz',
output: 'foo?.[bar]?.baz?.buzz',
},
{
// case with a jump (i.e. a non-nullish prop)
code: 'foo && foo[bar].baz && foo[bar].baz.buzz',
output: 'foo?.[bar].baz?.buzz',
},
// case with a property access in computed property
{
code: 'foo && foo[bar.baz] && foo[bar.baz].buzz',
output: 'foo?.[bar.baz]?.buzz',
},
// case with this keyword
{
code: 'foo[this.bar] && foo[this.bar].baz',
output: 'foo[this.bar]?.baz',
},
// chained calls
{
code: 'foo && foo.bar && foo.bar.baz && foo.bar.baz.buzz()',
output: 'foo?.bar?.baz?.buzz()',
},
{
code: 'foo && foo.bar && foo.bar.baz && foo.bar.baz.buzz && foo.bar.baz.buzz()',
output: 'foo?.bar?.baz?.buzz?.()',
},
{
code: 'foo.bar && foo.bar.baz && foo.bar.baz.buzz && foo.bar.baz.buzz()',
output: 'foo.bar?.baz?.buzz?.()',
},
// case with a jump (i.e. a non-nullish prop)
{
code: 'foo && foo.bar && foo.bar.baz.buzz()',
output: 'foo?.bar?.baz.buzz()',
},
{
code: 'foo.bar && foo.bar.baz.buzz()',
output: 'foo.bar?.baz.buzz()',
},
{
// case with a jump (i.e. a non-nullish prop)
code: 'foo && foo.bar && foo.bar.baz.buzz && foo.bar.baz.buzz()',
output: 'foo?.bar?.baz.buzz?.()',
},
{
// case with a call expr inside the chain for some inefficient reason
code: 'foo && foo.bar() && foo.bar().baz && foo.bar().baz.buzz && foo.bar().baz.buzz()',
output: 'foo?.bar()?.baz?.buzz?.()',
},
// chained calls with element access
{
code: 'foo && foo.bar && foo.bar.baz && foo.bar.baz[buzz]()',
output: 'foo?.bar?.baz?.[buzz]()',
},
{
code: 'foo && foo.bar && foo.bar.baz && foo.bar.baz[buzz] && foo.bar.baz[buzz]()',
output: 'foo?.bar?.baz?.[buzz]?.()',
},
// (partially) pre-optional chained
{
code: 'foo && foo?.bar && foo?.bar.baz && foo?.bar.baz[buzz] && foo?.bar.baz[buzz]()',
output: 'foo?.bar?.baz?.[buzz]?.()',
},
{
code: 'foo && foo?.bar.baz && foo?.bar.baz[buzz]',
output: 'foo?.bar.baz?.[buzz]',
},
{
code: 'foo && foo?.() && foo?.().bar',
output: 'foo?.()?.bar',
},
{
code: 'foo.bar && foo.bar?.() && foo.bar?.().baz',
output: 'foo.bar?.()?.baz',
},
// private properties
{
code: 'foo.#bar && foo.#bar.baz',
output: 'foo.#bar?.baz',
},
{
code: 'foo && foo.#bar',
output: 'foo?.#bar',
},
{
code: 'foo && foo[bar.#baz]',
output: 'foo?.[bar.#baz]',
},
{
code: 'foo[bar.#baz] && foo[bar.#baz].buzz',
output: 'foo[bar.#baz]?.buzz',
},
].map(
c =>
({
code: c.code.trim(),
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: c.output.trim(),
},
],
},
],
} as TSESLint.InvalidTestCase<
InferMessageIdsTypeFromRule<typeof rule>,
InferOptionsTypeFromRule<typeof rule>
>),
);
ruleTester.run('prefer-optional-chain', rule, {
valid: [
'!a || !b;',
'!a || a.b;',
'!a && a.b;',
'!a && !a.b;',
'!a.b || a.b?.();',
'!a.b || a.b();',
'!foo() || !foo().bar;',
'foo || {};',
'foo || ({} as any);',
'(foo || {})?.bar;',
'(foo || { bar: 1 }).bar;',
'(undefined && (foo || {})).bar;',
'foo ||= bar;',
'foo ||= bar || {};',
'foo ||= bar?.baz;',
'foo ||= bar?.baz || {};',
'foo ||= bar?.baz?.buzz;',
'(foo1 ? foo2 : foo3 || {}).foo4;',
'(foo = 2 || {}).bar;',
'func(foo || {}).bar;',
'foo ?? {};',
'(foo ?? {})?.bar;',
'foo ||= bar ?? {};',
'foo && bar;',
'foo && foo;',
'foo || bar;',
'foo ?? bar;',
'foo || foo.bar;',
'foo ?? foo.bar;',
"file !== 'index.ts' && file.endsWith('.ts');",
'nextToken && sourceCode.isSpaceBetweenTokens(prevToken, nextToken);',
'result && this.options.shouldPreserveNodeMaps;',
'foo && fooBar.baz;',
'match && match$1 !== undefined;',
'foo !== null && foo !== undefined;',
"x['y'] !== undefined && x['y'] !== null;",
// private properties
'this.#a && this.#b;',
'!this.#a || !this.#b;',
'a.#foo?.bar;',
'!a.#foo?.bar;',
'!foo().#a || a;',
'!a.b.#a || a;',
'!new A().#b || a;',
'!(await a).#b || a;',
"!(foo as any).bar || 'anything';",
// currently do not handle complex computed properties
'foo && foo[bar as string] && foo[bar as string].baz;',
'foo && foo[1 + 2] && foo[1 + 2].baz;',
'foo && foo[typeof bar] && foo[typeof bar].baz;',
'!foo[1 + 1] || !foo[1 + 2];',
'!foo[1 + 1] || !foo[1 + 1].foo;',
'!foo || !foo[bar as string] || !foo[bar as string].baz;',
'!foo || !foo[1 + 2] || !foo[1 + 2].baz;',
'!foo || !foo[typeof bar] || !foo[typeof bar].baz;',
// currently do not handle 'this' as the first part of a chain
'this && this.foo;',
'!this || !this.foo;',
// intentionally do not handle mixed TSNonNullExpression in properties
'!entity.__helper!.__initialized || options.refresh;',
'!foo!.bar || !foo!.bar.baz;',
'!foo!.bar!.baz || !foo!.bar!.baz!.paz;',
'!foo.bar!.baz || !foo.bar!.baz!.paz;',
'import.meta || true;',
'import.meta || import.meta.foo;',
'!import.meta && false;',
'!import.meta && !import.meta.foo;',
'new.target || new.target.length;',
'!new.target || true;',
],
invalid: [
...baseCases,
// it should ignore whitespace in the expressions
...baseCases.map(c => ({
...c,
code: c.code.replace(/\./g, '. '),
})),
...baseCases.map(c => ({
...c,
code: c.code.replace(/\./g, '.\n'),
})),
// it should ignore parts of the expression that aren't part of the expression chain
...baseCases.map(c => ({
...c,
code: `${c.code} && bing`,
errors: [
{
...c.errors[0],
suggestions: [
{
...c.errors[0].suggestions![0],
output: `${c.errors[0].suggestions![0].output} && bing`,
},
],
},
],
})),
...baseCases.map(c => ({
...c,
code: `${c.code} && bing.bong`,
errors: [
{
...c.errors[0],
suggestions: [
{
...c.errors[0].suggestions![0],
output: `${c.errors[0].suggestions![0].output} && bing.bong`,
},
],
},
],
})),
// strict nullish equality checks x !== null && x.y !== null
...baseCases.map(c => ({
...c,
code: c.code.replace(/&&/g, '!== null &&'),
})),
...baseCases.map(c => ({
...c,
code: c.code.replace(/&&/g, '!= null &&'),
})),
...baseCases.map(c => ({
...c,
code: c.code.replace(/&&/g, '!== undefined &&'),
})),
...baseCases.map(c => ({
...c,
code: c.code.replace(/&&/g, '!= undefined &&'),
})),
// two errors
{
code: noFormat`foo && foo.bar && foo.bar.baz || baz && baz.bar && baz.bar.foo`,
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: `foo?.bar?.baz || baz && baz.bar && baz.bar.foo`,
},
],
},
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: `foo && foo.bar && foo.bar.baz || baz?.bar?.foo`,
},
],
},
],
},
// case with inconsistent checks
{
code: 'foo && foo.bar != null && foo.bar.baz !== undefined && foo.bar.baz.buzz;',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar?.baz?.buzz;',
},
],
},
],
},
{
code: noFormat`foo.bar && foo.bar.baz != null && foo.bar.baz.qux !== undefined && foo.bar.baz.qux.buzz;`,
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo.bar?.baz?.qux?.buzz;',
},
],
},
],
},
// ensure essential whitespace isn't removed
{
code: 'foo && foo.bar(baz => <This Requires Spaces />);',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar(baz => <This Requires Spaces />);',
},
],
},
],
parserOptions: {
ecmaFeatures: {
jsx: true,
},
},
},
{
code: 'foo && foo.bar(baz => typeof baz);',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar(baz => typeof baz);',
},
],
},
],
},
{
code: noFormat`foo && foo["some long string"] && foo["some long string"].baz`,
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: `foo?.["some long string"]?.baz`,
},
],
},
],
},
{
code: noFormat`foo && foo[\`some long string\`] && foo[\`some long string\`].baz`,
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: `foo?.[\`some long string\`]?.baz`,
},
],
},
],
},
{
code: "foo && foo['some long string'] && foo['some long string'].baz;",
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: "foo?.['some long string']?.baz;",
},
],
},
],
},
// should preserve comments in a call expression
{
code: noFormat`
foo && foo.bar(/* comment */a,
// comment2
b, );
`,
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: `
foo?.bar(/* comment */a,
// comment2
b, );
`,
},
],
},
],
},
// ensure binary expressions that are the last expression do not get removed
{
code: 'foo && foo.bar != null;',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar != null;',
},
],
},
],
},
{
code: 'foo && foo.bar != undefined;',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar != undefined;',
},
],
},
],
},
{
code: 'foo && foo.bar != null && baz;',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar != null && baz;',
},
],
},
],
},
// case with this keyword at the start of expression
{
code: 'this.bar && this.bar.baz;',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'this.bar?.baz;',
},
],
},
],
},
// other weird cases
{
code: 'foo && foo?.();',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.();',
},
],
},
],
},
{
code: 'foo.bar && foo.bar?.();',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo.bar?.();',
},
],
},
],
},
// using suggestion instead of autofix
{
code: 'foo && foo.bar != null && foo.bar.baz !== undefined && foo.bar.baz.buzz;',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
line: 1,
column: 1,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar?.baz?.buzz;',
},
],
},
],
},
{
code: 'foo && foo.bar(baz => <This Requires Spaces />);',
output: null,
errors: [
{
messageId: 'preferOptionalChain',
line: 1,
column: 1,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar(baz => <This Requires Spaces />);',
},
],
},
],
parserOptions: {
ecmaFeatures: {
jsx: true,
},
},
},
{
code: '(foo || {}).bar;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 16,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar;',
},
],
},
],
},
{
code: noFormat`(foo || ({})).bar;`,
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 18,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar;',
},
],
},
],
},
{
code: noFormat`(await foo || {}).bar;`,
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 22,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(await foo)?.bar;',
},
],
},
],
},
{
code: '(foo1?.foo2 || {}).foo3;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 24,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo1?.foo2?.foo3;',
},
],
},
],
},
{
code: '((() => foo())() || {}).bar;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 28,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(() => foo())()?.bar;',
},
],
},
],
},
{
code: 'const foo = (bar || {}).baz;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 13,
endColumn: 28,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'const foo = bar?.baz;',
},
],
},
],
},
{
code: '(foo.bar || {})[baz];',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 21,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo.bar?.[baz];',
},
],
},
],
},
{
code: '((foo1 || {}).foo2 || {}).foo3;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 31,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(foo1 || {}).foo2?.foo3;',
},
],
},
{
messageId: 'optionalChainSuggest',
column: 2,
endColumn: 19,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(foo1?.foo2 || {}).foo3;',
},
],
},
],
},
{
code: '(foo || undefined || {}).bar;',
errors: [
{
messageId: 'optionalChainSuggest',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(foo || undefined)?.bar;',
},
],
},
],
},
{
code: '(foo() || bar || {}).baz;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 25,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(foo() || bar)?.baz;',
},
],
},
],
},
{
code: '((foo1 ? foo2 : foo3) || {}).foo4;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 34,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(foo1 ? foo2 : foo3)?.foo4;',
},
],
},
],
},
{
code: noFormat`if (foo) { (foo || {}).bar; }`,
errors: [
{
messageId: 'optionalChainSuggest',
column: 12,
endColumn: 27,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: `if (foo) { foo?.bar; }`,
},
],
},
],
},
{
code: noFormat`if ((foo || {}).bar) { foo.bar; }`,
errors: [
{
messageId: 'optionalChainSuggest',
column: 5,
endColumn: 20,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: `if (foo?.bar) { foo.bar; }`,
},
],
},
],
},
{
code: noFormat`(undefined && foo || {}).bar;`,
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 29,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(undefined && foo)?.bar;',
},
],
},
],
},
{
code: '(foo ?? {}).bar;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 16,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar;',
},
],
},
],
},
{
code: noFormat`(foo ?? ({})).bar;`,
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 18,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo?.bar;',
},
],
},
],
},
{
code: noFormat`(await foo ?? {}).bar;`,
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 22,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(await foo)?.bar;',
},
],
},
],
},
{
code: '(foo1?.foo2 ?? {}).foo3;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 24,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo1?.foo2?.foo3;',
},
],
},
],
},
{
code: '((() => foo())() ?? {}).bar;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 28,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(() => foo())()?.bar;',
},
],
},
],
},
{
code: 'const foo = (bar ?? {}).baz;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 13,
endColumn: 28,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'const foo = bar?.baz;',
},
],
},
],
},
{
code: '(foo.bar ?? {})[baz];',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 21,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: 'foo.bar?.[baz];',
},
],
},
],
},
{
code: '((foo1 ?? {}).foo2 ?? {}).foo3;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 31,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(foo1 ?? {}).foo2?.foo3;',
},
],
},
{
messageId: 'optionalChainSuggest',
column: 2,
endColumn: 19,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(foo1?.foo2 ?? {}).foo3;',
},
],
},
],
},
{
code: '(foo ?? undefined ?? {}).bar;',
errors: [
{
messageId: 'optionalChainSuggest',
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(foo ?? undefined)?.bar;',
},
],
},
],
},
{
code: '(foo() ?? bar ?? {}).baz;',
errors: [
{
messageId: 'optionalChainSuggest',
column: 1,
endColumn: 25,
suggestions: [
{
messageId: 'optionalChainSuggest',
output: '(foo() ?? bar)?.baz;',
},
],
},