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fix(eslint-plugin): [no-magic-numbers] fix implementation of the ignore option #9167

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Merged
merged 4 commits into from
Jun 6, 2024
Merged

fix(eslint-plugin): [no-magic-numbers] fix implementation of the ignore option #9167

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215b965
fix(eslint-plugin): [no-magic-numbers] fix implementation of the `ign…
Vinccool96 May 28, 2024
ef05ffb
Passed node's value as parameter
Vinccool96 Jun 2, 2024
1abbe89
Simple tests to check if value was correctly not ignored
Vinccool96 Jun 2, 2024
02d78e9
Simple tests to check if value was correctly ignored
Vinccool96 Jun 2, 2024
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45 changes: 44 additions & 1 deletion packages/eslint-plugin/src/rules/no-magic-numbers.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -58,11 +58,14 @@ export default createRule<Options, MessageIds>({
ignoreNumericLiteralTypes: false,
ignoreEnums: false,
ignoreReadonlyClassProperties: false,
ignoreTypeIndexes: false,
},
],
create(context, [options]) {
const rules = baseRule.create(context);

const ignored = new Set((options.ignore ?? []).map(normalizeIgnoreValue));

return {
Literal(node): void {
// If it’s not a numeric literal we’re not interested
Expand All @@ -76,8 +79,12 @@ export default createRule<Options, MessageIds>({
// not one of our exception cases, and we’ll fall back to the base rule.
let isAllowed: boolean | undefined;

// Check if the node is ignored
if (ignored.has(normalizeLiteralValue(node, node.value))) {
isAllowed = true;
}
// Check if the node is a TypeScript enum declaration
if (isParentTSEnumDeclaration(node)) {
else if (isParentTSEnumDeclaration(node)) {
isAllowed = options.ignoreEnums === true;
}
// Check TypeScript specific nodes for Numeric Literal
Expand Down Expand Up @@ -129,6 +136,42 @@ export default createRule<Options, MessageIds>({
},
});

/**
* Convert the value to bigint if it's a string. Otherwise, return the value as-is.
* @param value The value to normalize.
* @returns The normalized value.
*/
function normalizeIgnoreValue(
value: bigint | number | string,
): bigint | number {
if (typeof value === 'string') {
return BigInt(value.slice(0, -1));
}

return value;
}

/**
* Converts the node to its numeric value, handling prefixed numbers (-1 / +1)
* @param node the node to normalize.
* @param value the node's value.
*/
function normalizeLiteralValue(
node: TSESTree.BigIntLiteral | TSESTree.NumberLiteral,
value: number | bigint,
): bigint | number {
if (
node.parent.type === AST_NODE_TYPES.UnaryExpression &&
['-', '+'].includes(node.parent.operator)
) {
if (node.parent.operator === '-') {
return -value;
}
}

return value;
}

/**
* Gets the true parent of the literal, handling prefixed numbers (-1 / +1)
*/
Expand Down
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