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perf(linter): optimize no-dupe-keys (#4292)

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This tweaks the `no-dupe-keys` lint in order to try to optimize it.
The lints reliably shows up in both CPU and memory profiling,
due to the cost of allocating/growing the hashmap and hashing into it.
This PR tries to tackle both by skipping trivial cases and by
pre-allocating a larger hashmap.
This commit is contained in:
lucab 2024-07-16 11:08:23 +00:00
parent c5731a5431
commit 0fdc88beee
1 changed files with 6 additions and 2 deletions
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8
crates/oxc_linter/src/rules/eslint/no_dupe_keys.rs
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@ -5,7 +5,7 @@ use oxc_ast::{
use oxc_diagnostics::OxcDiagnostic;
use oxc_macros::declare_oxc_lint;
use oxc_span::{GetSpan, Span};
use rustc_hash::FxHashMap;
use rustc_hash::{FxBuildHasher, FxHashMap};
use crate::{context::LintContext, rule::Rule, AstNode};
@ -43,7 +43,11 @@ impl Rule for NoDupeKeys {
let AstKind::ObjectExpression(obj_expr) = node.kind() else {
return;
};
let mut map = FxHashMap::default();
let len = obj_expr.properties.len();
if len <= 1 {
return;
}
let mut map = FxHashMap::with_capacity_and_hasher(len, FxBuildHasher);
for prop in &obj_expr.properties {
let ObjectPropertyKind::ObjectProperty(prop) = prop else {
continue;