lib: lazy-load deps in source_map_cache.js

So that the file can be snapshotted. PR-URL: #45849 Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com> Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

Author: joyeecheung

lib/internal/source_map/source_map_cache.js

@@ -24,17 +24,19 @@ let debug = require('internal/util/debuglog').debuglog('source_map', (fn) => {
  debug = fn;
 });
 const { getOptionValue } = require('internal/options');
-const { IterableWeakMap } = require('internal/util/iterable_weak_map');
-const {
- normalizeReferrerURL,
-} = require('internal/modules/helpers');
+
 const { validateBoolean } = require('internal/validators');
 const { setMaybeCacheGeneratedSourceMap } = internalBinding('errors');
+const { getLazy } = require('internal/util');
 
 // 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:
-const cjsSourceMapCache = new IterableWeakMap();
+const getCjsSourceMapCache = getLazy(() => {
+ const { IterableWeakMap } = require('internal/util/iterable_weak_map');
+ return new IterableWeakMap();
+});
+
 // The esm cache is not mutable, so we can use a Map without memory concerns:
 const esmSourceMapCache = new SafeMap();
 // The generated sources is not mutable, so we can use a Map without memory concerns:
@@ -44,6 +46,7 @@ const kSourceMappingURLMagicComment = /\/[*/]#\s+sourceMappingURL=(?<sourceMappi
 const kSourceURLMagicComment = /\/[*/]#\s+sourceURL=(?<sourceURL>[^\s]+)/g;
 
 const { fileURLToPath, pathToFileURL, URL } = require('internal/url');
+
 let SourceMap;
 
 let sourceMapsEnabled;
@@ -114,6 +117,7 @@ function maybeCacheSourceMap(filename, content, cjsModuleInstance, isGeneratedSo
  const sourceMapsEnabled = getSourceMapsEnabled();
  if (!(process.env.NODE_V8_COVERAGE || sourceMapsEnabled)) return;
  try {
+ const { normalizeReferrerURL } = require('internal/modules/helpers');
  filename = normalizeReferrerURL(filename);
  } catch (err) {
  // This is most likely an invalid filename in sourceURL of [eval]-wrapper.
@@ -137,7 +141,7 @@ function maybeCacheSourceMap(filename, content, cjsModuleInstance, isGeneratedSo
  const data = dataFromUrl(filename, sourceMapURL);
  const url = data ? null : sourceMapURL;
  if (cjsModuleInstance) {
- cjsSourceMapCache.set(cjsModuleInstance, {
+ getCjsSourceMapCache().set(cjsModuleInstance, {
  filename,
  lineLengths: lineLengths(content),
  data,
@@ -291,7 +295,7 @@ function sourceMapCacheToObject() {
 }
 
 function appendCJSCache(obj) {
- for (const value of cjsSourceMapCache) {
+ for (const value of getCjsSourceMapCache()) {
  obj[ObjectGetValueSafe(value, 'filename')] = {
  lineLengths: ObjectGetValueSafe(value, 'lineLengths'),
  data: ObjectGetValueSafe(value, 'data'),
@@ -309,7 +313,7 @@ function findSourceMap(sourceURL) {
  }
  let sourceMap = esmSourceMapCache.get(sourceURL) ?? generatedSourceMapCache.get(sourceURL);
  if (sourceMap === undefined) {
- for (const value of cjsSourceMapCache) {
+ for (const value of getCjsSourceMapCache()) {
  const filename = ObjectGetValueSafe(value, 'filename');
  const cachedSourceURL = ObjectGetValueSafe(value, 'sourceURL');
  if (sourceURL === filename || sourceURL === cachedSourceURL) {

test/parallel/test-bootstrap-modules.js

@@ -87,7 +87,6 @@ const expectedModules = new Set([
  'NativeModule internal/util',
  'NativeModule internal/util/debuglog',
  'NativeModule internal/util/inspect',
- 'NativeModule internal/util/iterable_weak_map',
  'NativeModule internal/util/types',
  'NativeModule internal/v8/startup_snapshot',
  'NativeModule internal/validators',