esm: use wasm version of cjs-module-lexer

The synchronous version has been available since 1.4.0.

Author: joyeecheung

lib/internal/modules/esm/translators.js

@@ -74,12 +74,17 @@ function getSource(url) {
 let cjsParse;
 /**
  * Initializes the CommonJS module lexer parser using the JavaScript version.
- * TODO(joyeecheung): Use `require('internal/deps/cjs-module-lexer/dist/lexer').initSync()`
- * when cjs-module-lexer 1.4.0 is rolled in.
  */
 function initCJSParseSync() {
   if (cjsParse === undefined) {
-    cjsParse = require('internal/deps/cjs-module-lexer/lexer').parse;
+    if (typeof WebAssembly !== 'undefined') {
+      const { parse, initSync } = require('internal/deps/cjs-module-lexer/dist/lexer');
+      initSync();
+      cjsParse = parse;
+    } else {
+      const { parse } = require('internal/deps/cjs-module-lexer/lexer');
+      cjsParse = parse;
+    }
   }
 }
 

test/es-module/test-import-cjs-jitless.mjs

@@ -0,0 +1,6 @@
+// Flags: --jitless
+
+// Tests that importing a CJS module works in JIT-less mode (i.e. falling back to the
+// JS parser if WASM is not available).
+import '../common/index.mjs';
+import '../fixtures/empty.cjs';