fixup! lib: add api to enable source-maps programmatically

lib/internal/source_map/source_map_cache.js

@@ -29,6 +29,7 @@ const { IterableWeakMap } = require('internal/util/iterable_weak_map');
 const {
   normalizeReferrerURL,
 } = require('internal/modules/cjs/helpers');
+const { validateBoolean } = require('internal/validators');
 // Since the CJS module cache is mutable, which leads to memory leaks when
 // modules are deleted, we use a WeakMap so that the source map cache will
 // be purged automatically:
@@ -47,6 +48,8 @@ function getSourceMapsEnabled() {
 }
 
 function setSourceMapsEnabled(val) {
+  validateBoolean(val, 'val');
+
   const {
     setSourceMapsEnabled,
     setPrepareStackTraceCallback
@@ -58,7 +61,7 @@ function setSourceMapsEnabled(val) {
     } = require('internal/source_map/prepare_stack_trace');
     setPrepareStackTraceCallback(prepareStackTrace);
   } else if (sourceMapsEnabled !== undefined) {
-    // Set prepare stack trace callback only when disabling source maps.
+    // Reset prepare stack trace callback only when disabling source maps.
     const {
       prepareStackTrace,
     } = require('internal/errors');

test/parallel/test-process-setsourcemapsenabled.js

@@ -0,0 +1,16 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+
+const unexpectedValues = [
+  undefined,
+  null,
+  1,
+  {},
+  () => {},
+];
+for (const it of unexpectedValues) {
+  assert.throws(() => {
+    process.setSourceMapsEnabled(it);
+  }, /ERR_INVALID_ARG_TYPE/);
+}