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https://github.com/danbulant/oxc
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feat(linter) eslint plugin unicorn: no new array (#1160)
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Cameron
GitHub
parent
013cfe9c44
commit
0635d7b740
3 changed files with 533 additions and 0 deletions
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@ -146,6 +146,7 @@ mod unicorn {
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pub mod no_empty_file;
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pub mod no_instanceof_array;
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pub mod no_invalid_remove_event_listener;
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pub mod no_new_array;
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pub mod no_thenable;
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pub mod no_unnecessary_await;
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pub mod prefer_array_flat_map;
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@ -272,6 +273,7 @@ oxc_macros::declare_all_lint_rules! {
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unicorn::no_empty_file,
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unicorn::no_instanceof_array,
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unicorn::no_invalid_remove_event_listener,
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unicorn::no_new_array,
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unicorn::no_thenable,
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unicorn::no_unnecessary_await,
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unicorn::prefer_array_flat_map,
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134
crates/oxc_linter/src/rules/unicorn/no_new_array.rs
Normal file
134
crates/oxc_linter/src/rules/unicorn/no_new_array.rs
Normal file
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@ -0,0 +1,134 @@
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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-plugin-unicorn(no-new-array): Do not use `new Array()`.")]
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#[diagnostic(severity(warning), help(r#"If the argument is the array's length, consider using `Array.from({{ length: n }})` instead. If the argument is the only element, use `[element]` instead."#))]
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struct NoNewArrayDiagnostic(#[label] pub Span);
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#[derive(Debug, Default, Clone)]
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pub struct NoNewArray;
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declare_oxc_lint!(
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/// ### What it does
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///
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/// Disallow `new Array()`.
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///
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/// ### Why is this bad?
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///
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/// When using the `Array` constructor with one argument, it's not clear whether the argument is meant to be the length of the array or the only element.
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///
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/// ### Example
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/// ```javascript
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/// // bad
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/// const array = new Array(1);
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/// const array = new Array(42);
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/// const array = new Array(foo);
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///
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/// // good
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/// const array = Array.from({ length: 42 });
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/// const array = [42];
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/// ```
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NoNewArray,
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correctness
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);
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impl Rule for NoNewArray {
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fn run<'a>(&self, node: &AstNode<'a>, ctx: &LintContext<'a>) {
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let AstKind::NewExpression(new_expr) = node.kind() else { return };
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let Expression::Identifier(ident) = &new_expr.callee else { return };
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if ident.name != "Array" {
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return;
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}
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if new_expr.arguments.len() != 1 {
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return;
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}
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ctx.diagnostic(NoNewArrayDiagnostic(new_expr.span));
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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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r#"const array = Array.from({length: 1})"#,
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r#"const array = new Array()"#,
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r#"const array = new Array"#,
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r#"const array = new Array(1, 2)"#,
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r#"const array = Array(1, 2)"#,
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r#"const array = Array(1)"#,
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];
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let fail = vec)"#,
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r#"new Array(Number[MAX_SAFE_INTEGER])"#,
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r#"new Array(new Number(foo))"#,
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r#"const foo = 1; new Array(foo + "2")"#,
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r#"new Array(foo - 2n)"#,
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r#"new Array(foo -= 2n)"#,
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r#"new Array(foo instanceof 1)"#,
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r#"new Array(foo || 1)"#,
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r#"new Array(foo ||= 1)"#,
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r#"new Array(foo ? 1n : 2)"#,
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r#"new Array((1, 2n))"#,
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r#"new Array(-foo)"#,
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r#"new Array(~foo)"#,
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r#"new Array(typeof 1)"#,
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r#"const truthy = "truthy"; new Array(truthy ? foo : 1)"#,
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r#"const falsy = !"truthy"; new Array(falsy ? 1 : foo)"#,
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r#"new Array(unknown ? foo : 1)"#,
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r#"new Array(unknown ? 1 : foo)"#,
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r#"new Array(++foo)"#,
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r#"const array = new Array(foo)"#,
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r#"const array = new Array(length)"#,
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];
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Tester::new_without_config(NoNewArray::NAME, pass, fail).test_and_snapshot();
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}
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397
crates/oxc_linter/src/snapshots/no_new_array.snap
Normal file
397
crates/oxc_linter/src/snapshots/no_new_array.snap
Normal file
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@ -0,0 +1,397 @@
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---
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source: crates/oxc_linter/src/tester.rs
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expression: no_new_array
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---
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ const array = new Array(1)
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· ────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ const array = new Array(1.5)
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· ──────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ const array = new Array(Number("1"))
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· ──────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ const array = new Array("1")
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· ──────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ const array = new Array(null)
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· ───────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ const array = new Array(("1"))
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· ────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ const array = new Array((0, 1))
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· ─────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(0xff)
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· ───────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(Math.PI | foo)
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· ────────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(Math.min(foo, bar))
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· ─────────────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(Number(foo))
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· ──────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(Number.MAX_SAFE_INTEGER)
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· ──────────────────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(parseInt(foo))
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· ────────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(Number.parseInt(foo))
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· ───────────────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(+foo)
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· ───────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(-Math.PI)
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· ───────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(-"-2")
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· ────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(foo.length)
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· ─────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ const foo = 1; new Array(foo + 2)
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· ──────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(foo - 2)
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· ──────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(foo -= 2)
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· ───────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(foo ? 1 : 2)
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· ──────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ const truthy = "truthy"; new Array(truthy ? 1 : foo)
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· ───────────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ const falsy = !"truthy"; new Array(falsy ? foo : 1)
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· ──────────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array((1n, 2))
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· ──────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(Number.NaN)
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· ─────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(NaN)
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· ──────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(foo >>> bar)
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· ──────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(foo >>>= bar)
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· ───────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(++bar.length)
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· ───────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(bar.length++)
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· ───────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(foo = bar.length)
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· ───────────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array("0xff")
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· ─────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(Math.NON_EXISTS_PROPERTY)
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· ───────────────────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
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╭─[no_new_array.tsx:1:1]
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1 │ new Array(Math.NON_EXISTS_METHOD(foo))
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· ──────────────────────────────────────
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╰────
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help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
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|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(Math[min](foo, bar))
|
||||
· ──────────────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(Number[MAX_SAFE_INTEGER])
|
||||
· ───────────────────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(new Number(foo))
|
||||
· ──────────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ const foo = 1; new Array(foo + "2")
|
||||
· ────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(foo - 2n)
|
||||
· ───────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(foo -= 2n)
|
||||
· ────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(foo instanceof 1)
|
||||
· ───────────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(foo || 1)
|
||||
· ───────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(foo ||= 1)
|
||||
· ────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(foo ? 1n : 2)
|
||||
· ───────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array((1, 2n))
|
||||
· ──────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(-foo)
|
||||
· ───────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(~foo)
|
||||
· ───────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(typeof 1)
|
||||
· ───────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ const truthy = "truthy"; new Array(truthy ? foo : 1)
|
||||
· ───────────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ const falsy = !"truthy"; new Array(falsy ? 1 : foo)
|
||||
· ──────────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(unknown ? foo : 1)
|
||||
· ────────────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(unknown ? 1 : foo)
|
||||
· ────────────────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ new Array(++foo)
|
||||
· ────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ const array = new Array(foo)
|
||||
· ──────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
⚠ eslint-plugin-unicorn(no-new-array): Do not use `new Array()`.
|
||||
╭─[no_new_array.tsx:1:1]
|
||||
1 │ const array = new Array(length)
|
||||
· ─────────────────
|
||||
╰────
|
||||
help: If the argument is the array's length, consider using `Array.from({ length: n })` instead. If the argument is the only element, use `[element]` instead.
|
||||
|
||||
|
||||
Loading…
Reference in a new issue