#![feature(test)] extern crate test; use swc_common::{comments::SingleThreadedComments, FileName, Mark}; use swc_ecma_parser::{Parser, StringInput, Syntax}; use swc_ecma_preset_env::{preset_env, Config}; use swc_ecma_visit::FoldWith; use test::Bencher; fn run(b: &mut Bencher, src: &str, config: Config) { b.bytes = src.len() as _; let _ = ::testing::run_test(false, |cm, handler| { let fm = cm.new_source_file(FileName::Anon, src.into()); let mut parser = Parser::new(Syntax::default(), StringInput::from(&*fm), None); let module = parser .parse_module() .map_err(|e| e.into_diagnostic(handler).emit()) .unwrap(); for e in parser.take_errors() { e.into_diagnostic(handler).emit() } let mut folder = preset_env( Mark::fresh(Mark::root()), Some(SingleThreadedComments::default()), config, ); b.iter(|| test::black_box(module.clone().fold_with(&mut folder))); Ok(()) }); } #[bench] fn usage_builtin_type(b: &mut Bencher) { const SOURCE: &str = r#" // From a length var float32 = new Float32Array(2); float32[0] = 42; console.log(float32[0]); // 42 console.log(float32.length); // 2 console.log(float32.BYTES_PER_ELEMENT); // 4 // From an array var arr = new Float32Array([21,31]); console.log(arr[1]); // 31 // From another TypedArray var x = new Float32Array([21, 31]); var y = new Float32Array(x); console.log(y[0]); // 21 // From an ArrayBuffer var buffer = new ArrayBuffer(16); var z = new Float32Array(buffer, 0, 4); // From an iterable var iterable = function*(){ yield* [1,2,3]; }(); var float32 = new Float32Array(iterable); // Float32Array[1, 2, 3] "#; run(b, SOURCE, Default::default()) } #[bench] fn usage_property(b: &mut Bencher) { const SOURCE: &str = r#" const target = { a: 1, b: 2 }; const source = { b: 4, c: 5 }; const returnedTarget = Object.assign(target, source); console.log(target); // expected output: Object { a: 1, b: 4, c: 5 } console.log(returnedTarget); // expected output: Object { a: 1, b: 4, c: 5 } "#; run(b, SOURCE, Default::default()) }