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Make no-unused-collection not trigger if writing to elements of said collection #452

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Mar 18, 2024
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Make no-unused-collection not trigger if writing to elements of said collection #452

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Make no-unused-collection not trigger if writing to elements of said …
zglicz Mar 18, 2024
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zglicz Mar 18, 2024
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5 changes: 1 addition & 4 deletions src/rules/no-unused-collection.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -184,10 +184,7 @@ function isElementWrite(statement: TSESTree.ExpressionStatement, ref: TSESLint.S
}

function isMemberExpressionReference(lhs: TSESTree.Node, ref: TSESLint.Scope.Reference): boolean {
return (
lhs.type === 'MemberExpression' &&
(isReferenceTo(ref, lhs.object) || isMemberExpressionReference(lhs.object, ref))
);
return lhs.type === 'MemberExpression' && isReferenceTo(ref, lhs.object);
}

function isIdentifier(node: TSESTree.Node, ...values: string[]): node is TSESTree.Identifier {
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14 changes: 8 additions & 6 deletions tests/rules/no-unused-collection.test.ts
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Expand Up @@ -34,7 +34,7 @@ function invalidTest(code: string) {
};
}

ruleTester.run('Primitive return types should be used.', rule, {
ruleTester.run('Collection contents should be used', rule, {
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Seems to be some copypasta from some other test.

valid: [
{
code: `
Expand Down Expand Up @@ -169,6 +169,13 @@ ruleTester.run('Primitive return types should be used.', rule, {
{
code: `export const collection = new Map()`,
},
{
code: `
const a = {foo: false};
const xs = [a];
xs[0].foo = true;
`,
},
],
invalid: [
{
Expand Down Expand Up @@ -197,11 +204,6 @@ ruleTester.run('Primitive return types should be used.', rule, {
arrayConstructor[1] = 42;
}
`),
invalidTest(`function nok2_1() {
let arrayConstructor = new Array(); // Noncompliant
arrayConstructor[1][2] = 42;
}
Comment on lines -200 to -203
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this would now be considered compliant code, as the arrayConstructor array is being read to access arrayConstructor[1], hence should be not considered unused.

`),
invalidTest(`function nok3() {
let arrayWithoutNew = Array(); // Noncompliant
arrayWithoutNew[1] = 42;
Expand Down