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fix(linter): correct autofix in unicorn/prefer-number-properties for Infinity #12445

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merged 1 commit into from
Jul 22, 2025
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fix(linter): correct autofix in unicorn/prefer-number-properties for Infinity #12445

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111 changes: 92 additions & 19 deletions crates/oxc_linter/src/rules/unicorn/prefer_number_properties.rs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
use oxc_ast::{
AstKind,
ast::{Expression, match_member_expression},
ast::{Expression, UnaryOperator, match_member_expression},
};
use oxc_diagnostics::OxcDiagnostic;
use oxc_macros::declare_oxc_lint;
Expand Down Expand Up @@ -121,28 +121,66 @@ impl Rule for PreferNumberProperties {
AstKind::IdentifierReference(ident_ref)
if ctx.is_reference_to_global_variable(ident_ref) =>
{
if (ident_ref.name.as_str() == "NaN" && self.check_nan)
|| (ident_ref.name.as_str() == "Infinity" && self.check_infinity)
|| (matches!(
ident_ref.name.as_str(),
"isNaN" | "isFinite" | "parseFloat" | "parseInt"
) && matches!(
ctx.nodes().parent_kind(node.id()),
AstKind::ObjectProperty(_)
))
let ident_name = ident_ref.name.as_str();
if (ident_name == "NaN" && self.check_nan)
|| (ident_name == "Infinity" && self.check_infinity)
|| (matches!(ident_name, "isNaN" | "isFinite" | "parseFloat" | "parseInt")
&& matches!(ctx.nodes().parent_kind(node.id()), AstKind::ObjectProperty(_)))
{
let fixer = |fixer: RuleFixer<'_, 'a>| match ctx.nodes().parent_kind(node.id())
{
AstKind::ObjectProperty(object_property) if object_property.shorthand => {
fixer.insert_text_before(
&ident_ref.span,
format!("{}: Number.", ident_ref.name.as_str()),
)
let mut replacement = "Number.POSITIVE_INFINITY";
let mut replace_span = ident_ref.span;
let fixer = |fixer: RuleFixer<'_, 'a>| {
if ident_name == "Infinity" {
let unary_expr =
ctx.nodes().ancestor_kinds(node.id()).find_map(|ancestor| {
if let AstKind::UnaryExpression(unary_expr) = ancestor {
Some(unary_expr)
} else {
None
}
});

if let Some(unary_expr) = unary_expr {
replacement = if matches!(
unary_expr.operator,
UnaryOperator::UnaryNegation
) {
// -(Infinity) -> Number.NEGATIVE_INFINITY
// +(Infinity) -> +(Number.POSITIVE_INFINITY)
replace_span = unary_expr.span;
"Number.NEGATIVE_INFINITY"
} else {
"Number.POSITIVE_INFINITY"
};
}
}
match ctx.nodes().parent_kind(node.id()) {
AstKind::ObjectProperty(object_property)
if object_property.shorthand =>
{
if ident_name == "Infinity" {
fixer.insert_text_after(
&ident_ref.span,
format!(": {replacement}"),
)
} else {
fixer.insert_text_before(
&ident_ref.span,
format!("{}: Number.", ident_ref.name.as_str()),
)
}
}
_ => {
if ident_name == "Infinity" {
fixer.replace(replace_span, replacement)
} else {
fixer.insert_text_before(&ident_ref.span, "Number.")
}
}
}
_ => fixer.insert_text_before(&ident_ref.span, "Number."),
};

if ident_ref.name.as_str() == "isNaN" || ident_ref.name.as_str() == "isFinite" {
if ident_name == "isNaN" || ident_name == "isFinite" {
ctx.diagnostic_with_dangerous_fix(
prefer_number_properties_diagnostic(ident_ref.span, &ident_ref.name),
fixer,
Expand Down Expand Up @@ -480,6 +518,41 @@ function inner() {
("class Foo3 {[NaN] = 1}", "class Foo3 {[Number.NaN] = 1}", None),
("class Foo2 {[NaN] = 1}", "class Foo2 {[Number.NaN] = 1}", None),
("class Foo {[NaN] = 1}", "class Foo {[Number.NaN] = 1}", None),
(
"const foo = Infinity;",
"const foo = Number.POSITIVE_INFINITY;",
Some(json!([{"checkInfinity":true}])),
),
(
"const foo = -Infinity;",
"const foo = Number.NEGATIVE_INFINITY;",
Some(json!([{"checkInfinity":true}])),
),
(
"const foo = -(Infinity);",
"const foo = Number.NEGATIVE_INFINITY;",
Some(json!([{"checkInfinity":true}])),
),
(
"const foo = -((Infinity));",
"const foo = Number.NEGATIVE_INFINITY;",
Some(json!([{"checkInfinity":true}])),
),
(
"let a = { Infinity, }",
"let a = { Infinity: Number.POSITIVE_INFINITY, }",
Some(json!([{"checkInfinity":true}])),
),
(
"let a = (Infinity)",
"let a = (Number.POSITIVE_INFINITY)",
Some(json!([{"checkInfinity":true}])),
),
(
"let a = +(Infinity)",
"let a = +(Number.POSITIVE_INFINITY)",
Some(json!([{"checkInfinity":true}])),
),
];

Tester::new(PreferNumberProperties::NAME, PreferNumberProperties::PLUGIN, pass, fail)
Expand Down
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