fixup! src,lib: print source map error source on demand

.eslintignore

@@ -6,6 +6,7 @@ test/message/esm_display_syntax_error.mjs
 tools/icu
 tools/lint-md/lint-md.mjs
 benchmark/tmp
+benchmark/fixtures
 doc/**/*.js
 !doc/api_assets/*.js
 !.eslintrc.js

benchmark/es/error-stack.js

@@ -0,0 +1,34 @@
+'use strict';
+
+const common = require('../common.js');
+const modPath = require.resolve('../fixtures/simple-error-stack.js');
+
+const bench = common.createBenchmark(main, {
+  method: ['without-sourcemap', 'sourcemap'],
+  n: [1e5],
+});
+
+function runN(n) {
+  delete require.cache[modPath];
+  const mod = require(modPath);
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    mod.simpleErrorStack();
+  }
+  bench.end(n);
+}
+
+function main({ n, method }) {
+  switch (method) {
+    case 'without-sourcemap':
+      process.setSourceMapsEnabled(false);
+      runN(n);
+      break;
+    case 'sourcemap':
+      process.setSourceMapsEnabled(true);
+      runN(n);
+      break;
+    default:
+      throw new Error(`Unexpected method "${method}"`);
+  }
+}

benchmark/fixtures/simple-error-stack.ts

@@ -0,0 +1,17 @@
+'use strict';
+
+// Compile with `tsc --inlineSourceMap benchmark/fixtures/simple-error-stack.ts`.
+
+const lorem = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.';
+
+function simpleErrorStack() {
+  try {
+    (lorem as any).BANG();
+  } catch (e) {
+    return e.stack;
+  }
+}
+
+export {
+  simpleErrorStack,
+};