Vendor things

third-party/vendor/swc_ecma_parser/examples/perf.rs

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+extern crate swc_node_base;
+
+use std::{collections::hash_map::DefaultHasher, hash::Hash};
+
+use criterion::black_box;
+use swc_common::{self, sync::Lrc, SourceMap};
+use swc_ecma_parser::{lexer::Lexer, Parser, StringInput, Syntax, TsConfig};
+
+fn main() {
+    let mut cnt = 0;
+    let mut hasher = DefaultHasher::new();
+
+    for entry in walkdir::WalkDir::new("tests/typescript") {
+        let entry = entry.unwrap();
+        if !entry.path().to_string_lossy().ends_with(".ts")
+            && !entry.path().to_string_lossy().ends_with(".tsx")
+        {
+            continue;
+        }
+
+        let cm: Lrc<SourceMap> = Default::default();
+
+        let fm = cm.load_file(entry.path()).unwrap();
+
+        let lexer = Lexer::new(
+            Syntax::Typescript(TsConfig {
+                no_early_errors: true,
+                tsx: entry.path().to_string_lossy().ends_with(".tsx"),
+                ..Default::default()
+            }),
+            Default::default(),
+            StringInput::from(&*fm),
+            None,
+        );
+
+        let mut parser = Parser::new_from(lexer);
+
+        let module = parser.parse_typescript_module();
+
+        if let Ok(module) = &module {
+            module.hash(&mut hasher);
+        }
+
+        let _ = black_box(module);
+
+        cnt += 1;
+    }
+
+    eprintln!("Parsed {} files", cnt);
+    eprintln!("Hash: {:?}", hasher);
+}