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fix(eslint-plugin): [prefer-optional-chain] suggests optional chaining during strict null equality check #8717

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Merged
merged 16 commits into from
Apr 24, 2024
Merged

fix(eslint-plugin): [prefer-optional-chain] suggests optional chaining during strict null equality check #8717

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8baa3fa
fix [prefer-optional-chain] suggests optional chaining during strict …
up201304504 Mar 18, 2024
68acba3
fix [prefer-optional-chain] suggests optional chaining during strict …
up201304504 Mar 19, 2024
cb68747
Fix lint
jsfm01 Mar 22, 2024
29246c4
Add prefer-optional-chain test
jsfm01 Mar 22, 2024
5307759
Fix lint
jsfm01 Mar 22, 2024
6fb2f03
rebase and fix prefer optional chain on strict null equality
up201304504 Mar 31, 2024
3a8bdb7
fix prefer optional chain on strict null equality
up201304504 Mar 31, 2024
ef31674
fix lint
up201304504 Apr 1, 2024
80d78d9
Merge branch 'main' into fix/7654-prefer-optional-chain
up201304504 Apr 10, 2024
f49c964
tests: code review suggestion
up201304504 Apr 10, 2024
9904ae4
Merge branch 'main' into fix/7654-prefer-optional-chain
jsfm01 Apr 19, 2024
8c0b87b
Merge branch 'main' into fix/7654-prefer-optional-chain
up201304504 Apr 22, 2024
7094d28
Update packages/eslint-plugin/src/rules/prefer-optional-chain-utils/a…
JoshuaKGoldberg Apr 23, 2024
5a0732b
Merge branch 'main'
JoshuaKGoldberg Apr 23, 2024
888874b
Merge branch 'main' into fix/7654-prefer-optional-chain
up201304504 Apr 23, 2024
27f7269
Merge branch 'main' into fix/7654-prefer-optional-chain
up201304504 Apr 23, 2024
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21 changes: 16 additions & 5 deletions packages/eslint-plugin/src/rules/prefer-optional-chain-utils/analyzeChain.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -61,13 +61,24 @@ const analyzeAndChainOperand: OperandAnalyzer = (
chain,
) => {
switch (operand.comparisonType) {
case NullishComparisonType.Boolean:
case NullishComparisonType.Boolean: {
const nextOperand = chain.at(index + 1);
if (
nextOperand?.comparisonType ===
NullishComparisonType.NotStrictEqualNull &&
operand.comparedName.type === AST_NODE_TYPES.Identifier
) {
return null;
}
return [operand];
}

case NullishComparisonType.NotEqualNullOrUndefined:
return [operand];

case NullishComparisonType.NotStrictEqualNull: {
// handle `x !== null && x !== undefined`
const nextOperand = chain[index + 1] as ValidOperand | undefined;
const nextOperand = chain.at(index + 1);
if (
nextOperand?.comparisonType ===
NullishComparisonType.NotStrictEqualUndefined &&
Expand All @@ -94,7 +105,7 @@ const analyzeAndChainOperand: OperandAnalyzer = (

case NullishComparisonType.NotStrictEqualUndefined: {
// handle `x !== undefined && x !== null`
const nextOperand = chain[index + 1] as ValidOperand | undefined;
const nextOperand = chain.at(index + 1);
if (
nextOperand?.comparisonType ===
NullishComparisonType.NotStrictEqualNull &&
Expand Down Expand Up @@ -132,7 +143,7 @@ const analyzeOrChainOperand: OperandAnalyzer = (

case NullishComparisonType.StrictEqualNull: {
// handle `x === null || x === undefined`
const nextOperand = chain[index + 1] as ValidOperand | undefined;
const nextOperand = chain.at(index + 1);
if (
nextOperand?.comparisonType ===
NullishComparisonType.StrictEqualUndefined &&
Expand All @@ -159,7 +170,7 @@ const analyzeOrChainOperand: OperandAnalyzer = (

case NullishComparisonType.StrictEqualUndefined: {
// handle `x === undefined || x === null`
const nextOperand = chain[index + 1] as ValidOperand | undefined;
const nextOperand = chain.at(index + 1);
if (
nextOperand?.comparisonType === NullishComparisonType.StrictEqualNull &&
compareNodes(operand.comparedName, nextOperand.comparedName) ===
Expand Down
2 changes: 2 additions & 0 deletions packages/eslint-plugin/tests/rules/prefer-optional-chain/prefer-optional-chain.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -793,6 +793,8 @@ describe('hand-crafted cases', () => {
'(function () {}) && function () {}.name;',
'(class Foo {}) && class Foo {}.constructor;',
"new Map().get('a') && new Map().get('a').what;",
// https://github.com/typescript-eslint/typescript-eslint/issues/7654
'data && data.value !== null;',
{
code: '<div /> && (<div />).wtf;',
parserOptions: { ecmaFeatures: { jsx: true } },
Expand Down