feat(linter/eslint): implement no-new-func

crates/oxc_linter/src/rules.rs

@@ -81,6 +81,7 @@ mod eslint {
     pub mod no_loss_of_precision;
     pub mod no_multi_str;
     pub mod no_new;
+    pub mod no_new_func;
     pub mod no_new_native_nonconstructor;
     pub mod no_new_wrappers;
     pub mod no_nonoctal_decimal_escape;
@@ -524,6 +525,7 @@ oxc_macros::declare_all_lint_rules! {
     eslint::no_iterator,
     eslint::no_loss_of_precision,
     eslint::no_new,
+    eslint::no_new_func,
     eslint::no_new_wrappers,
     eslint::no_nonoctal_decimal_escape,
     eslint::no_obj_calls,

crates/oxc_linter/src/rules/eslint/no_new_func.rs

@@ -0,0 +1,143 @@
+use oxc_ast::{ast::IdentifierReference, AstKind};
+use oxc_diagnostics::OxcDiagnostic;
+use oxc_macros::declare_oxc_lint;
+use oxc_span::Span;
+
+use crate::{context::LintContext, rule::Rule, AstNode};
+
+fn no_new_func(span: Span) -> OxcDiagnostic {
+    OxcDiagnostic::warn("The Function constructor is eval.").with_label(span)
+}
+
+fn is_global_function_reference(ctx: &LintContext, id: &IdentifierReference) -> bool {
+    if let Some(reference_id) = id.reference_id() {
+        return id.name == "Function" && ctx.symbols().is_global_reference(reference_id);
+    }
+    false
+}
+
+#[derive(Debug, Default, Clone)]
+pub struct NoNewFunc;
+
+declare_oxc_lint!(
+    /// ### What it does
+    ///
+    /// The rule disallow `new` operators with the `Function` object.
+    ///
+    /// ### Why is this bad?
+    ///
+    /// Using `new Function` or `Function` can lead to code that is difficult to understand and maintain. It can introduce security risks similar to those associated with `eval` because it generates a new function from a string of code, which can be a vector for injection attacks. Additionally, it impacts performance negatively as these functions are not optimized by the JavaScript engine.
+    ///
+    /// ### Examples
+    ///
+    /// Examples of **incorrect** code for this rule:
+    /// ```js
+    /// var x = new Function("a", "b", "return a + b");
+    /// var x = Function("a", "b", "return a + b");
+    /// var x = Function.call(null, "a", "b", "return a + b");
+    /// var x = Function.apply(null, ["a", "b", "return a + b"]);
+    /// var x = Function.bind(null, "a", "b", "return a + b")();
+    /// var f = Function.bind(null, "a", "b", "return a + b");
+    /// ```
+    ///
+    /// Examples of **correct** code for this rule:
+    /// ```js
+    /// let x = function (a, b) {
+    ///  return a + b;
+    /// };
+    /// ```
+    NoNewFunc,
+    style
+);
+
+impl Rule for NoNewFunc {
+    fn run<'a>(&self, node: &AstNode<'a>, ctx: &LintContext<'a>) {
+        let id_and_span = match node.kind() {
+            AstKind::NewExpression(new_expr) => {
+                let Some(id) = new_expr.callee.get_identifier_reference() else {
+                    return;
+                };
+
+                Some((id, new_expr.span))
+            }
+            AstKind::CallExpression(call_expr) => {
+                let Some(obj_id) = call_expr.callee.get_identifier_reference() else {
+                    return;
+                };
+
+                Some((obj_id, call_expr.span))
+            }
+            AstKind::MemberExpression(mem_expr) => {
+                let parent: Option<&AstNode<'a>> =
+                    ctx.nodes().iter_parents(node.id()).skip(1).find(|node| {
+                        !matches!(
+                            node.kind(),
+                            AstKind::ChainExpression(_) | AstKind::ParenthesizedExpression(_)
+                        )
+                    });
+
+                let Some(AstKind::CallExpression(parent_call_expr)) = parent.map(AstNode::kind)
+                else {
+                    return;
+                };
+
+                let Some(static_property_name) = &mem_expr.static_property_name() else {
+                    return;
+                };
+
+                if !["apply", "bind", "call"].contains(static_property_name) {
+                    return;
+                }
+
+                let Some(obj_id) = mem_expr.object().get_identifier_reference() else {
+                    return;
+                };
+
+                Some((obj_id, parent_call_expr.span))
+            }
+            _ => None,
+        };
+
+        if let Some((id, span)) = id_and_span {
+            if is_global_function_reference(ctx, id) {
+                ctx.diagnostic(no_new_func(span));
+            }
+        }
+    }
+}
+
+#[test]
+fn test() {
+    use crate::tester::Tester;
+
+    let pass = vec![
+        r#"var a = new _function("b", "c", "return b+c");"#,
+        r#"var a = _function("b", "c", "return b+c");"#,
+        "class Function {}; new Function()",
+        "const fn = () => { class Function {}; new Function() }",
+        "function Function() {}; Function()",
+        "var fn = function () { function Function() {}; Function() }",
+        "var x = function Function() { Function(); }",
+        "call(Function)",
+        "new Class(Function)",
+        "foo[Function]()",
+        "foo(Function.bind)",
+        "Function.toString()",
+        "Function[call]()",
+    ];
+
+    let fail = vec![
+        r#"var a = new Function("b", "c", "return b+c");"#,
+        r#"var a = Function("b", "c", "return b+c");"#,
+        r#"var a = Function.call(null, "b", "c", "return b+c");"#,
+        r#"var a = Function.apply(null, ["b", "c", "return b+c"]);"#,
+        r#"var a = Function.bind(null, "b", "c", "return b+c")();"#,
+        r#"var a = Function.bind(null, "b", "c", "return b+c");"#,
+        r#"var a = Function["call"](null, "b", "c", "return b+c");"#,
+        r#"var a = (Function?.call)(null, "b", "c", "return b+c");"#,
+        "const fn = () => { class Function {} }; new Function('', '')",
+        "var fn = function () { function Function() {} }; Function('', '')",
+    ];
+
+    Tester::new(NoNewFunc::NAME, pass, fail).test_and_snapshot();
+}

crates/oxc_linter/src/snapshots/no_new_func.snap

@@ -0,0 +1,62 @@
+---
+source: crates/oxc_linter/src/tester.rs
+---
+  ⚠ eslint(no-new-func): The Function constructor is eval.
+   ╭─[no_new_func.tsx:1:9]
+ 1 │ var a = new Function("b", "c", "return b+c");
+   ·         ────────────────────────────────────
+   ╰────
+
+  ⚠ eslint(no-new-func): The Function constructor is eval.
+   ╭─[no_new_func.tsx:1:9]
+ 1 │ var a = Function("b", "c", "return b+c");
+   ·         ────────────────────────────────
+   ╰────
+
+  ⚠ eslint(no-new-func): The Function constructor is eval.
+   ╭─[no_new_func.tsx:1:9]
+ 1 │ var a = Function.call(null, "b", "c", "return b+c");
+   ·         ───────────────────────────────────────────
+   ╰────
+
+  ⚠ eslint(no-new-func): The Function constructor is eval.
+   ╭─[no_new_func.tsx:1:9]
+ 1 │ var a = Function.apply(null, ["b", "c", "return b+c"]);
+   ·         ──────────────────────────────────────────────
+   ╰────
+
+  ⚠ eslint(no-new-func): The Function constructor is eval.
+   ╭─[no_new_func.tsx:1:9]
+ 1 │ var a = Function.bind(null, "b", "c", "return b+c")();
+   ·         ───────────────────────────────────────────
+   ╰────
+
+  ⚠ eslint(no-new-func): The Function constructor is eval.
+   ╭─[no_new_func.tsx:1:9]
+ 1 │ var a = Function.bind(null, "b", "c", "return b+c");
+   ·         ───────────────────────────────────────────
+   ╰────
+
+  ⚠ eslint(no-new-func): The Function constructor is eval.
+   ╭─[no_new_func.tsx:1:9]
+ 1 │ var a = Function["call"](null, "b", "c", "return b+c");
+   ·         ──────────────────────────────────────────────
+   ╰────
+
+  ⚠ eslint(no-new-func): The Function constructor is eval.
+   ╭─[no_new_func.tsx:1:9]
+ 1 │ var a = (Function?.call)(null, "b", "c", "return b+c");
+   ·         ──────────────────────────────────────────────
+   ╰────
+
+  ⚠ eslint(no-new-func): The Function constructor is eval.
+   ╭─[no_new_func.tsx:1:41]
+ 1 │ const fn = () => { class Function {} }; new Function('', '')
+   ·                                         ────────────────────
+   ╰────
+
+  ⚠ eslint(no-new-func): The Function constructor is eval.
+   ╭─[no_new_func.tsx:1:50]
+ 1 │ var fn = function () { function Function() {} }; Function('', '')
+   ·                                                  ────────────────
+   ╰────