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https://github.com/danbulant/oxc
synced 2026-05-19 04:08:41 +00:00
feat(linter): eslint/no-new-native-nonconstructor (#3187)
feat(linter): eslint/no-new-native-nonconstructor closes #3179 remove no new symbol
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5 changed files with 112 additions and 91 deletions
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@ -85,7 +85,7 @@ mod eslint {
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pub mod no_iterator;
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pub mod no_loss_of_precision;
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pub mod no_mixed_operators;
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pub mod no_new_symbol;
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pub mod no_new_native_nonconstructor;
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pub mod no_new_wrappers;
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pub mod no_nonoctal_decimal_escape;
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pub mod no_obj_calls;
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@ -444,7 +444,6 @@ oxc_macros::declare_all_lint_rules! {
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eslint::no_iterator,
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eslint::no_loss_of_precision,
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eslint::no_mixed_operators,
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eslint::no_new_symbol,
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eslint::no_new_wrappers,
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eslint::no_nonoctal_decimal_escape,
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eslint::no_obj_calls,
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@ -475,6 +474,7 @@ oxc_macros::declare_all_lint_rules! {
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eslint::use_isnan,
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eslint::valid_typeof,
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eslint::no_await_in_loop,
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eslint::no_new_native_nonconstructor,
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typescript::adjacent_overload_signatures,
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typescript::array_type,
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typescript::ban_ts_comment,
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@ -0,0 +1,83 @@
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use oxc_ast::{ast::Expression, AstKind};
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use oxc_diagnostics::{
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miette::{self, Diagnostic},
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thiserror::{self, Error},
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};
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use oxc_macros::declare_oxc_lint;
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use oxc_span::{CompactStr, Span};
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use crate::{context::LintContext, rule::Rule, AstNode};
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#[derive(Debug, Error, Diagnostic)]
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#[error("eslint(no-new-native-nonconstructor): `{0}` cannot be called as a constructor.")]
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#[diagnostic(severity(warning))]
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struct NoNewNativeNonconstructorDiagnostic(CompactStr, #[label] pub Span);
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#[derive(Debug, Default, Clone)]
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pub struct NoNewNativeNonconstructor;
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declare_oxc_lint!(
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/// ### What it does
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///
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/// Disallow new operators with global non-constructor functions (Symbol, BigInt)
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///
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/// ### Why is this bad?
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///
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/// Both new Symbol and new BigInt throw a type error because they are functions and not classes.
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/// It is easy to make this mistake by assuming the uppercase letters indicate classes.
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///
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/// ### Example
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/// ```javascript
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/// // throws a TypeError
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/// let foo = new Symbol("foo");
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///
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/// // throws a TypeError
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/// let result = new BigInt(9007199254740991);
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/// ```
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NoNewNativeNonconstructor,
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correctness,
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);
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impl Rule for NoNewNativeNonconstructor {
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fn run<'a>(&self, node: &AstNode<'a>, ctx: &LintContext<'a>) {
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let AstKind::NewExpression(expr) = node.kind() else { return };
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let Expression::Identifier(ident) = &expr.callee else { return };
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if matches!(ident.name.as_str(), "Symbol" | "BigInt")
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&& ctx.semantic().is_reference_to_global_variable(ident)
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{
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let start = expr.span.start;
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let end = start + 3;
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ctx.diagnostic(NoNewNativeNonconstructorDiagnostic(
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ident.name.to_compact_str(),
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Span::new(start, end),
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));
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}
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}
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}
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#[test]
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fn test() {
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use crate::tester::Tester;
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let pass = vec![
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"var foo = Symbol('foo');",
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"function bar(Symbol) { var baz = new Symbol('baz');}",
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"function Symbol() {} new Symbol();",
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"new foo(Symbol);",
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"new foo(bar, Symbol);",
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"var foo = BigInt(9007199254740991);",
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"function bar(BigInt) { var baz = new BigInt(9007199254740991);}",
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"function BigInt() {} new BigInt();",
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"new foo(BigInt);",
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"new foo(bar, BigInt);",
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];
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let fail = vec![
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"var foo = new Symbol('foo');",
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"function bar() { return function Symbol() {}; } var baz = new Symbol('baz');",
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"var foo = new BigInt(9007199254740991);",
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"function bar() { return function BigInt() {}; } var baz = new BigInt(9007199254740991);",
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];
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Tester::new(NoNewNativeNonconstructor::NAME, pass, fail).test_and_snapshot();
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}
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@ -1,72 +0,0 @@
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use oxc_ast::{ast::Expression, AstKind};
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use oxc_diagnostics::{
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miette::{self, Diagnostic},
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thiserror::Error,
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};
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use oxc_macros::declare_oxc_lint;
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use oxc_span::Span;
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use crate::{context::LintContext, rule::Rule, AstNode};
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#[derive(Debug, Error, Diagnostic)]
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#[error("eslint(no-new-symbol): Disallow new operators with the Symbol object")]
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#[diagnostic(
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severity(warning),
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help(
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"Symbol is not intended to be used with the new operator, but to be called as a function. Consider removing the new operator."
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)
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)]
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struct NoNewSymbolDiagnostic(#[label] pub Span);
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#[derive(Debug, Default, Clone)]
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pub struct NoNewSymbol;
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declare_oxc_lint!(
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/// ### What it does
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///
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/// Disallow new operators with the Symbol object
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///
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///
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/// ### Why is this bad?
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///
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/// Symbol is not intended to be used with the new operator, but to be called as a function.
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///
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/// ### Example
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/// ```javascript
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/// var foo = new Symbol('foo');
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/// ```
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NoNewSymbol,
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correctness
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);
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impl Rule for NoNewSymbol {
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fn run<'a>(&self, node: &AstNode<'a>, ctx: &LintContext<'a>) {
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let AstKind::NewExpression(expr) = node.kind() else { return };
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let Expression::Identifier(ident) = &expr.callee else { return };
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if ident.name == "Symbol" && ctx.semantic().is_reference_to_global_variable(ident) {
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let start = expr.span.start;
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let end = start + 3;
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ctx.diagnostic(NoNewSymbolDiagnostic(Span::new(start, end)));
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}
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}
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}
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#[test]
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fn test() {
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use crate::tester::Tester;
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let pass = vec![
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("var foo = Symbol('foo');", None),
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("function bar(Symbol) { var baz = new Symbol('baz');}", None),
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("function Symbol() {} new Symbol();", None),
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("new foo(Symbol);", None),
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("new foo(bar, Symbol);", None),
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];
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let fail = vec![
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("var foo = new Symbol('foo');", None),
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("function bar() { return function Symbol() {}; } var baz = new Symbol('baz');", None),
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];
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Tester::new(NoNewSymbol::NAME, pass, fail).test_and_snapshot();
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}
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@ -0,0 +1,27 @@
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---
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source: crates/oxc_linter/src/tester.rs
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expression: no_new_native_nonconstructor
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---
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⚠ eslint(no-new-native-nonconstructor): `Symbol` cannot be called as a constructor.
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╭─[no_new_native_nonconstructor.tsx:1:11]
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1 │ var foo = new Symbol('foo');
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· ───
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╰────
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⚠ eslint(no-new-native-nonconstructor): `Symbol` cannot be called as a constructor.
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╭─[no_new_native_nonconstructor.tsx:1:59]
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1 │ function bar() { return function Symbol() {}; } var baz = new Symbol('baz');
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· ───
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╰────
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⚠ eslint(no-new-native-nonconstructor): `BigInt` cannot be called as a constructor.
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╭─[no_new_native_nonconstructor.tsx:1:11]
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1 │ var foo = new BigInt(9007199254740991);
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· ───
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╰────
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⚠ eslint(no-new-native-nonconstructor): `BigInt` cannot be called as a constructor.
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╭─[no_new_native_nonconstructor.tsx:1:59]
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1 │ function bar() { return function BigInt() {}; } var baz = new BigInt(9007199254740991);
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· ───
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╰────
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@ -1,17 +0,0 @@
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---
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source: crates/oxc_linter/src/tester.rs
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expression: no_new_symbol
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---
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⚠ eslint(no-new-symbol): Disallow new operators with the Symbol object
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╭─[no_new_symbol.tsx:1:11]
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1 │ var foo = new Symbol('foo');
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· ───
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╰────
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help: Symbol is not intended to be used with the new operator, but to be called as a function. Consider removing the new operator.
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⚠ eslint(no-new-symbol): Disallow new operators with the Symbol object
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╭─[no_new_symbol.tsx:1:59]
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1 │ function bar() { return function Symbol() {}; } var baz = new Symbol('baz');
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· ───
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╰────
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help: Symbol is not intended to be used with the new operator, but to be called as a function. Consider removing the new operator.
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