8000 fix(eslint-plugin): [no-unnecessary-condition] handle noUncheckedIndexedAccess true by yeonjuan · Pull Request #10514 · typescript-eslint/typescript-eslint · GitHub
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fix(eslint-plugin): [no-unnecessary-condition] handle noUncheckedIndexedAccess true #10514

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Merged
merged 3 commits into from
Dec 23, 2024
Merged

fix(eslint-plugin): [no-unnecessary-condition] handle noUncheckedIndexedAccess true #10514

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059dfb8
fix(eslint-plugin): [no-unnecessary-condition] handle index signature
yeonjuan Dec 17, 2024
572d02f
fix
yeonjuan Dec 17, 2024
31f10b0
refactor
yeonjuan Dec 17, 2024
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18 changes: 13 additions & 5 deletions packages/eslint-plugin/src/rules/no-unnecessary-condition.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -273,6 +273,10 @@ export default createRule<Options, MessageId>({
compilerOptions,
'strictNullChecks',
);
const isNoUncheckedIndexedAccess = tsutils.isCompilerOptionEnabled(
compilerOptions,
'noUncheckedIndexedAccess',
);

if (
!isStrictNullChecks &&
Expand Down Expand Up @@ -756,11 +760,15 @@ export default createRule<Options, MessageId>({
}
const indexInfo = checker.getIndexInfosOfType(type);

return indexInfo.some(
info =>
getTypeName(checker, info.keyType) === 'string' &&
isNullableType(info.type),
);
return indexInfo.some(info => {
const isStringTypeName =
getTypeName(checker, info.keyType) === 'string';

return (
isStringTypeName &&
(isNoUncheckedIndexedAccess || isNullableType(info.type))
);
});
});
return !isOwnNullable && isNullableType(prevType);
}
Expand Down
68 changes: 53 additions & 15 deletions packages/eslint-plugin/tests/rules/no-unnecessary-condition.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,12 @@ const optionsWithExactOptionalPropertyTypes = {
tsconfigRootDir: rootPath,
};

const optionsWithNoUncheckedIndexedAccess = {
project: './tsconfig.noUncheckedIndexedAccess.json',
projectService: false,
tsconfigRootDir: getFixturesRootDir(),
};

const necessaryConditionTest = (condition: string): string => `
declare const b1: ${condition};
declare const b2: boolean;
Expand Down Expand Up @@ -591,11 +597,7 @@ const key = '1' as BrandedKey;
foo?.[key]?.trim();
`,
languageOptions: {
parserOptions: {
project: './tsconfig.noUncheckedIndexedAccess.json',
projectService: false,
tsconfigRootDir: getFixturesRootDir(),
},
parserOptions: optionsWithNoUncheckedIndexedAccess,
},
},
{
Expand Down Expand Up @@ -649,11 +651,7 @@ function Foo(outer: Outer, key: Foo): number | undefined {
}
`,
languageOptions: {
parserOptions: {
project: './tsconfig.noUncheckedIndexedAccess.json',
projectService: false,
tsconfigRootDir: getFixturesRootDir(),
},
parserOptions: optionsWithNoUncheckedIndexedAccess,
},
},
{
Expand All @@ -666,11 +664,51 @@ declare const key: Key;
foo?.[key]?.trim();
`,
languageOptions: {
parserOptions: {
project: './tsconfig.noUncheckedIndexedAccess.json',
projectService: false,
tsconfigRootDir: getFixturesRootDir(),
},
parserOptions: optionsWithNoUncheckedIndexedAccess,
},
},
{
code: `
type Foo = {
key?: Record<string, { key: string }>;
};
declare const foo: Foo;
foo.key?.someKey?.key;
`,
languageOptions: {
parserOptions: optionsWithNoUncheckedIndexedAccess,
},
},
{
code: `
type Foo = {
key?: {
[key: string]: () => void;
};
};
declare const foo: Foo;
foo.key?.value?.();
`,
languageOptions: {
parserOptions: optionsWithNoUncheckedIndexedAccess,
},
},
{
code: `
type A = {
[name in Lowercase<string>]?: {
[name in Lowercase<string>]: {
a: 1;
};
};
};

declare const a: A;

a.a?.a?.a;
`,
languageOptions: {
parserOptions: optionsWithNoUncheckedIndexedAccess,
},
},
`
Expand Down
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