Merge pull request #2292 from ing-bank/fix/providence-glob-perf

Fix/providence glob perf

.changeset/witty-seals-love.md

@@ -0,0 +1,8 @@
+---
+'providence-analytics': patch
+---
+
+- expose types; improve logging and formatting
+- apply memoisation in optimised-glob
+- add perf logs to LogService
+- allow to clear cache of memoized function

packages-node/providence-analytics/package.json

@@ -24,7 +24,8 @@
   },
   "files": [
     "inlined-swc-to-babel",
-    "src"
+    "src",
+    "types"
   ],
   "scripts": {
     "dashboard": "node ./src/dashboard/server.js --run-server --serve-from-package-root",

packages-node/providence-analytics/src/program/analyzers/find-classes.js

@@ -1,10 +1,11 @@
 /* eslint-disable no-shadow, no-param-reassign */
 import path from 'path';
 
-import t from '@babel/types';
 import babelTraverse from '@babel/traverse';
-import { Analyzer } from '../core/Analyzer.js';
+import t from '@babel/types';
+
 import { trackDownIdentifierFromScope } from '../utils/track-down-identifier--legacy.js';
+import { Analyzer } from '../core/Analyzer.js';
 
 /**
  * @typedef {import('@babel/types').File} File

packages-node/providence-analytics/src/program/analyzers/match-imports.js

@@ -1,5 +1,5 @@
 /* eslint-disable no-continue */
-import pathLib from 'path';
+import path from 'path';
 /* eslint-disable no-shadow, no-param-reassign */
 import FindImportsAnalyzer from './find-imports.js';
 import FindExportsAnalyzer from './find-exports.js';
@@ -9,14 +9,15 @@ import { transformIntoIterableFindExportsOutput } from './helpers/transform-into
 import { transformIntoIterableFindImportsOutput } from './helpers/transform-into-iterable-find-imports-output.js';
 
 /**
- * @typedef {import('../../../types/index.js').FindImportsAnalyzerResult} FindImportsAnalyzerResult
- * @typedef {import('../../../types/index.js').FindExportsAnalyzerResult} FindExportsAnalyzerResult
+ * @typedef {import('../../../types/index.js').ConciseMatchImportsAnalyzerResult} ConciseMatchImportsAnalyzerResult
  * @typedef {import('../../../types/index.js').IterableFindExportsAnalyzerEntry} IterableFindExportsAnalyzerEntry
  * @typedef {import('../../../types/index.js').IterableFindImportsAnalyzerEntry} IterableFindImportsAnalyzerEntry
- * @typedef {import('../../../types/index.js').ConciseMatchImportsAnalyzerResult} ConciseMatchImportsAnalyzerResult
- * @typedef {import('../../../types/index.js').MatchImportsConfig} MatchImportsConfig
- * @typedef {import('../../../types/index.js').MatchImportsAnalyzerResult} MatchImportsAnalyzerResult
  * @typedef {import('../../../types/index.js').PathRelativeFromProjectRoot} PathRelativeFromProjectRoot
+ * @typedef {import('../../../types/index.js').MatchImportsAnalyzerResult} MatchImportsAnalyzerResult
+ * @typedef {import('../../../types/index.js').FindImportsAnalyzerResult} FindImportsAnalyzerResult
+ * @typedef {import('../../../types/index.js').FindExportsAnalyzerResult} FindExportsAnalyzerResult
+ * @typedef {import('../../../types/index.js').AnalyzerQueryResult} AnalyzerQueryResult
+ * @typedef {import('../../../types/index.js').MatchImportsConfig} MatchImportsConfig
  * @typedef {import('../../../types/index.js').PathFromSystemRoot} PathFromSystemRoot
  * @typedef {import('../../../types/index.js').AnalyzerName} AnalyzerName
  * @typedef {import('../../../types/index.js').AnalyzerAst} AnalyzerAst
@@ -117,7 +118,7 @@ async function matchImportsPostprocess(exportsAnalyzerResult, importsAnalyzerRes
       const fromImportToExport = await fromImportToExportPerspective({
         importee: importEntry.normalizedSource,
         importer: /** @type {PathFromSystemRoot} */ (
-          pathLib.resolve(importProjectPath, importEntry.file)
+          path.resolve(importProjectPath, importEntry.file)
         ),
         importeeProjectPath: cfg.referenceProjectPath,
       });
@@ -193,6 +194,7 @@ export default class MatchImportsAnalyzer extends Analyzer {
      * Prepare
      */
     const cachedAnalyzerResult = await this._prepare(cfg);
+
     if (cachedAnalyzerResult) {
       return cachedAnalyzerResult;
     }
@@ -205,6 +207,7 @@ export default class MatchImportsAnalyzer extends Analyzer {
         targetProjectPath: cfg.referenceProjectPath,
         skipCheckMatchCompatibility: cfg.skipCheckMatchCompatibility,
         suppressNonCriticalLogs: true,
+        gatherFilesConfig: cfg.gatherFilesConfigReference,
       });
     }
 
@@ -216,6 +219,7 @@ export default class MatchImportsAnalyzer extends Analyzer {
         targetProjectPath: cfg.targetProjectPath,
         skipCheckMatchCompatibility: cfg.skipCheckMatchCompatibility,
         suppressNonCriticalLogs: true,
+        gatherFilesConfig: cfg.gatherFilesConfig,
       });
     }
 

packages-node/providence-analytics/src/program/core/Analyzer.js

@@ -1,27 +1,39 @@
 /* eslint-disable no-param-reassign */
-import semver from 'semver';
 import path from 'path';
-import { LogService } from './LogService.js';
-import { QueryService } from './QueryService.js';
-import { ReportService } from './ReportService.js';
+
+import semver from 'semver';
+
+import { getFilePathRelativeFromRoot } from '../utils/get-file-path-relative-from-root.js';
 import { InputDataService } from './InputDataService.js';
 import { toPosixPath } from '../utils/to-posix-path.js';
-import { getFilePathRelativeFromRoot } from '../utils/get-file-path-relative-from-root.js';
+import { ReportService } from './ReportService.js';
+import { QueryService } from './QueryService.js';
+import { LogService } from './LogService.js';
 
 /**
- * @typedef {import("@swc/core").Module} SwcAstModule
- * @typedef {import('../../../types/index.js').AnalyzerName} AnalyzerName
- * @typedef {import('../../../types/index.js').AnalyzerAst} AnalyzerAst
- * @typedef {import('../../../types/index.js').PathFromSystemRoot} PathFromSystemRoot
- * @typedef {import('../../../types/index.js').QueryOutput} QueryOutput
- * @typedef {import('../../../types/index.js').ProjectInputData} ProjectInputData
+ * @typedef {(ast: File, astContext: {code:string; relativePath:string; projectData: ProjectInputDataWithMeta}) => object} FileAstTraverseFn
  * @typedef {import('../../../types/index.js').ProjectInputDataWithMeta} ProjectInputDataWithMeta
  * @typedef {import('../../../types/index.js').AnalyzerQueryResult} AnalyzerQueryResult
  * @typedef {import('../../../types/index.js').MatchAnalyzerConfig} MatchAnalyzerConfig
+ * @typedef {import('../../../types/index.js').PathFromSystemRoot} PathFromSystemRoot
+ * @typedef {import('../../../types/index.js').ProjectInputData} ProjectInputData
+ * @typedef {import('../../../types/index.js').AnalyzerName} AnalyzerName
+ * @typedef {import('../../../types/index.js').AnalyzerAst} AnalyzerAst
+ * @typedef {import('../../../types/index.js').QueryOutput} QueryOutput
+ * @typedef {import("@swc/core").Module} SwcAstModule
  * @typedef {import('@babel/types').File} File
- * @typedef {(ast: File, astContext: {code:string; relativePath:string; projectData: ProjectInputDataWithMeta}) => object} FileAstTraverseFn
  */
 
+/**
+ * @param {string} identifier
+ */
+function displayProjectsInLog(identifier) {
+  const [target, targetV, , reference, referenceV] = identifier.split('_');
+  return decodeURIComponent(
+    `${target}@${targetV} ${reference ? `- ${reference}@${referenceV}` : ''}`,
+  );
+}
+
 /**
  * Analyzes one entry: the callback can traverse a given ast for each entry
  * @param {ProjectInputDataWithMeta} projectData
@@ -247,12 +259,7 @@ export class Analyzer {
       if (!compatible) {
         if (!cfg.suppressNonCriticalLogs) {
           LogService.info(
-            `skipping ${LogService.pad(this.name, 16)} for ${
-              this.identifier
-            }: (${reason})\n${cfg.targetProjectPath.replace(
-              `${process.cwd()}/providence-input-data/search-targets/`,
-              '',
-            )}`,
+            `${LogService.pad(`skipping  ${this.name} (${reason})`)}${displayProjectsInLog(this.identifier)}`,
           );
         }
         return ensureAnalyzerResultFormat(`[${reason}]`, cfg, this);
@@ -273,24 +280,43 @@ export class Analyzer {
     }
 
     if (!cfg.suppressNonCriticalLogs) {
-      LogService.info(`starting ${LogService.pad(this.name, 16)} for ${this.identifier}`);
+      LogService.info(
+        `${LogService.pad(`starting ${this.name}`)}${displayProjectsInLog(this.identifier)}`,
+      );
     }
 
     /**
      * Get reference and search-target data
      */
     if (!cfg.targetProjectResult) {
+      performance.mark('analyzer--prepare--createDTarg-start');
       this.targetData = await InputDataService.createDataObject(
         [cfg.targetProjectPath],
         cfg.gatherFilesConfig,
       );
+      performance.mark('analyzer--prepare--createDTarg-end');
+      const m1 = performance.measure(
+        'analyzer--prepare--createDTarg',
+        'analyzer--prepare--createDTarg-start',
+        'analyzer--prepare--createDTarg-end',
+      );
+      LogService.perf(m1);
     }
 
     if (cfg.referenceProjectPath) {
+      performance.mark('analyzer--prepare--createDRef-start');
+
       this.referenceData = await InputDataService.createDataObject(
         [cfg.referenceProjectPath],
         cfg.gatherFilesConfigReference || cfg.gatherFilesConfig,
       );
+      performance.mark('analyzer--prepare--createDRef-end');
+      const m2 = performance.measure(
+        'analyzer--prepare--createDRef',
+        'analyzer--prepare--createDRef-start',
+        'analyzer--prepare--createDRef-end',
+      );
+      LogService.perf(m2);
     }
 
     return undefined;
@@ -304,10 +330,21 @@ export class Analyzer {
   _finalize(queryOutput, cfg) {
     LogService.debug(`Analyzer "${this.name}": started _finalize method`);
 
+    performance.mark('analyzer--finalize-start');
     const analyzerResult = ensureAnalyzerResultFormat(queryOutput, cfg, this);
     if (!cfg.suppressNonCriticalLogs) {
-      LogService.success(`finished ${LogService.pad(this.name, 16)} for ${this.identifier}`);
+      LogService.success(
+        `${LogService.pad(`finished ${this.name}`)}${displayProjectsInLog(this.identifier)}`,
+      );
     }
+    performance.mark('analyzer--finalize-end');
+    const measurementFinalize = performance.measure(
+      'analyzer--finalize',
+      'analyzer--finalize-start',
+      'analyzer--finalize-end',
+    );
+    LogService.perf(measurementFinalize);
+
     return analyzerResult;
   }
 

packages-node/providence-analytics/src/program/core/LogService.js

@@ -97,11 +97,25 @@ export class LogService {
     log(colors.fgBlue, `   info${printTitle(title)}`, colors.reset, text);
   }
 
+  /**
+   * @param {PerformanceMeasure} measurement
+   * @param {string} [title]
+   */
+  static perf(measurement, title) {
+    const text = `${this.pad(`[${measurement.name}]`)} ${measurement.duration}ms`;
+    // @ts-ignore
+    this._logHistory.push(`-    perf -${printTitle(title)} ${text}`);
+    if (this.allMuted || !this.perfEnabled) {
+      return;
+    }
+    log(colors.fgGray, `   perf${printTitle(title)}`, colors.reset, text);
+  }
+
   /**
    * @param {string} text
    * @param {number} minChars
    */
-  static pad(text, minChars = 20) {
+  static pad(text, minChars = 40) {
     let result = text;
     const padding = minChars - text.length;
     if (padding > 0) {
@@ -127,6 +141,7 @@ export class LogService {
 LogService.debugEnabled = false;
 LogService.allMuted = false;
 LogService.throwsOnError = false;
+LogService.perfEnabled = false;
 
 /** @type {string[]} */
 LogService._logHistory = [];

packages-node/providence-analytics/src/program/providence.js

@@ -9,13 +9,13 @@ import { LogService } from './core/LogService.js';
 import { AstService } from './core/AstService.js';
 
 /**
- * @typedef {import('../../types/index.js').ProvidenceConfig} ProvidenceConfig
- * @typedef {import('../../types/index.js').PathFromSystemRoot} PathFromSystemRoot
- * @typedef {import('../../types/index.js').QueryResult} QueryResult
  * @typedef {import('../../types/index.js').AnalyzerQueryResult} AnalyzerQueryResult
- * @typedef {import('../../types/index.js').QueryConfig} QueryConfig
  * @typedef {import('../../types/index.js').AnalyzerQueryConfig} AnalyzerQueryConfig
+ * @typedef {import('../../types/index.js').PathFromSystemRoot} PathFromSystemRoot
  * @typedef {import('../../types/index.js').GatherFilesConfig} GatherFilesConfig
+ * @typedef {import('../../types/index.js').ProvidenceConfig} ProvidenceConfig
+ * @typedef {import('../../types/index.js').QueryResult} QueryResult
+ * @typedef {import('../../types/index.js').QueryConfig} QueryConfig
  */
 
 /**
@@ -81,6 +81,8 @@ function getSlicedQueryConfig(queryConfig, targetProjectPath, referenceProjectPa
  * @param {{ gatherFilesConfig:GatherFilesConfig, gatherFilesConfigReference:GatherFilesConfig, skipCheckMatchCompatibility:boolean }} cfg
  */
 async function handleAnalyzerForProjectCombo(slicedQConfig, cfg) {
+  performance.mark(`${slicedQConfig.analyzerName}-start`);
+
   const queryResult = await QueryService.astSearch(slicedQConfig, {
     gatherFilesConfig: cfg.gatherFilesConfig,
     gatherFilesConfigReference: cfg.gatherFilesConfigReference,
@@ -88,6 +90,17 @@ async function handleAnalyzerForProjectCombo(slicedQConfig, cfg) {
     addSystemPathsInResult: cfg.addSystemPathsInResult,
     ...slicedQConfig.analyzerConfig,
   });
+
+  performance.mark(`${slicedQConfig.analyzerName}-end`);
+  const measurement = /** @type {* & PerformanceMeasure} */ (
+    performance.measure(
+      slicedQConfig.analyzerName,
+      `${slicedQConfig.analyzerName}-start`,
+      `${slicedQConfig.analyzerName}-end`,
+    )
+  );
+  LogService.perf(measurement);
+
   if (queryResult) {
     report(queryResult, cfg);
   }

packages-node/providence-analytics/src/program/utils/memoize.js

@@ -24,10 +24,9 @@ function createCachableArg(arg) {
 
 /**
  * @template T
- * @type {<T extends Function>(functionToMemoize:T, opts?:{ storage?:object; }) => T}
+ * @type {<T extends Function>(functionToMemoize:T, opts?:{ cacheStorage?:object; }) => T & {clearCache:() => void}}
  */
-export function memoize(functionToMemoize, { storage = {} } = {}) {
-  return /** @type {* & T} */ (
+export function memoize(functionToMemoize, { cacheStorage = {} } = {}) {
   function memoizedFn() {
     // eslint-disable-next-line prefer-rest-params
     const args = [...arguments];
@@ -36,18 +35,22 @@ export function memoize(functionToMemoize, { storage = {} } = {}) {
     const cachableArgs = shouldSerialize ? args.map(createCachableArg) : args;
     // Allow disabling of cache for testing purposes
     // @ts-expect-error
-      if (shouldCache && cachableArgs in storage) {
+    if (shouldCache && cachableArgs in cacheStorage) {
       // @ts-expect-error
-        return storage[cachableArgs];
+      return cacheStorage[cachableArgs];
     }
     // @ts-expect-error
     const outcome = functionToMemoize.apply(this, args);
     // @ts-expect-error
     // eslint-disable-next-line no-param-reassign
-      storage[cachableArgs] = outcome;
+    cacheStorage[cachableArgs] = outcome;
     return outcome;
   }
-  );
+  memoizedFn.clearCache = () => {
+    // eslint-disable-next-line no-param-reassign
+    cacheStorage = {};
+  };
+  return /** @type {* & T & {clearCache:() => void}} */ (memoizedFn);
 }
 
 /**

packages-node/providence-analytics/src/program/utils/optimised-glob.js

@@ -4,22 +4,25 @@ import nodeFs from 'fs';
 import path from 'path';
 
 import { toPosixPath } from './to-posix-path.js';
+import { memoize } from './memoize.js';
 
 /**
  * @typedef {nodeFs} FsLike
+ * @typedef {nodeFs.Dirent & {path:string;parentPath:string}} DirentWithPath
  * @typedef {{onlyDirectories:boolean;onlyFiles:boolean;deep:number;suppressErrors:boolean;fs: FsLike;cwd:string;absolute:boolean;extglob:boolean;}} FastGlobtions
  */
 
 const [nodeMajor] = process.versions.node.split('.').map(Number);
 
-/**
+export const parseGlobToRegex = memoize(
+  /**
    * @param {string} glob
    * @param {object} [providedOpts]
    * @param {boolean} [providedOpts.globstar=true] if true, '/foo/*' => '^\/foo\/[^/]*$' (not allowing folders inside *), else '/foo/*' => '^\/foo\/.*$'
    * @param {boolean} [providedOpts.extglob=true] if true, supports so called "extended" globs (like bash) and single character matching, matching ranges of characters, group matching etc.
    * @returns {RegExp}
    */
-export function parseGlobToRegex(glob, providedOpts) {
+  (glob, providedOpts) => {
     if (typeof glob !== 'string') throw new TypeError('Expected a string');
 
     const options = {
@@ -84,7 +87,9 @@ export function parseGlobToRegex(glob, providedOpts) {
           regexResultStr += '.*';
         } else {
           const isGlobstarSegment =
-          isMultiStar && ['/', undefined].includes(prevChar) && ['/', undefined].includes(nextChar);
+            isMultiStar &&
+            ['/', undefined].includes(prevChar) &&
+            ['/', undefined].includes(nextChar);
           if (isGlobstarSegment) {
             // Match zero or more path segments
             regexResultStr += '((?:[^/]*(?:/|$))*)';
@@ -101,12 +106,14 @@ export function parseGlobToRegex(glob, providedOpts) {
     }
 
     return new RegExp(`^${regexResultStr}$`);
-}
+  },
+);
 
-/**
+const getStartPath = memoize(
+  /**
    * @param {string} glob
    */
-function getStartPath(glob) {
+  glob => {
     const reservedChars = ['?', '[', ']', '{', '}', ',', '.', '*'];
     let hasFoundReservedChar = false;
     return glob
@@ -118,45 +125,68 @@ function getStartPath(glob) {
       })
       .filter(Boolean)
       .join('/');
-}
+  },
+);
 
 let isCacheEnabled = false;
-/** @type {{[path:string]:nodeFs.Dirent[]}} */
+/** @type {{[path:string]:DirentWithPath[]}} */
 const cache = {};
 
-/**
+const getAllDirentsFromStartPath = memoize(
+  /**
    * @param {string} startPath
- * @param {{fs?:FsLike, dirents?:nodeFs.Dirent[]}} providedOptions
- * @returns {Promise<nodeFs.Dirent[]>}
+   * @param {{fs?:FsLike, dirents?:DirentWithPath[]}} providedOptions
+   * @returns {Promise<DirentWithPath[]>}
    */
-async function getAllFilesFromStartPath(
-  startPath,
-  { fs = /** @type {* & FsLike} */ (nodeFs), dirents = [] } = {},
-) {
+  async (startPath, { fs = /** @type {* & FsLike} */ (nodeFs), dirents = [] } = {}) => {
     if (isCacheEnabled && cache[startPath]) return cache[startPath];
 
     // Older node doesn't support recursive option
     if (nodeMajor < 18) {
       /** @type {nodeFs.Dirent[]} */
       const direntsForLvl = await fs.promises.readdir(startPath, { withFileTypes: true });
-    for (const dirent of direntsForLvl) {
-      // @ts-expect-error
+      for (const _dirent of direntsForLvl) {
+        const dirent = /** @type {DirentWithPath} */ (_dirent);
         dirent.parentPath = dirent.path = startPath; // eslint-disable-line no-multi-assign
-      dirents.push(dirent);
+        dirents.push(/** @type {DirentWithPath} */ (dirent));
 
         if (dirent.isDirectory()) {
           const subDir = path.join(startPath, dirent.name);
-        await getAllFilesFromStartPath(subDir, { fs, dirents });
+          await getAllDirentsFromStartPath(subDir, { fs, dirents });
         }
       }
-    return /** @type {nodeFs.Dirent[]} */ (dirents);
+      return dirents;
     }
 
+    dirents.push(
       // @ts-expect-error
-  dirents.push(...(await fs.promises.readdir(startPath, { withFileTypes: true, recursive: true })));
+      ...(await fs.promises.readdir(startPath, { withFileTypes: true, recursive: true })),
+    );
     cache[startPath] = dirents;
     return dirents;
-}
+  },
+);
+
+const getAllDirentsRelativeToCwd = memoize(
+  /**
+   * @param {string} fullStartPath
+   * @param {{fs?:FsLike, cwd:string}} options
+   * @returns {Promise<{relativeToCwdPath:string;dirent:DirentWithPath}[]>}
+   */
+  async (fullStartPath, options) => {
+    const allDirentsRelativeToStartPath = await getAllDirentsFromStartPath(fullStartPath, {
+      fs: options.fs,
+    });
+
+    const allDirEntsRelativeToCwd = allDirentsRelativeToStartPath.map(dirent => ({
+      relativeToCwdPath: toPosixPath(
+        path.join(dirent.parentPath || dirent.path, dirent.name),
+      ).replace(`${toPosixPath(options.cwd)}/`, ''),
+      dirent,
+    }));
+    return allDirEntsRelativeToCwd;
+  },
+);
 
 /**
  * Lightweight glob implementation.
@@ -219,18 +249,11 @@ export async function optimisedGlob(globOrGlobs, providedOptions = {}) {
     const fullStartPath = path.join(options.cwd, startPath);
 
     try {
-      const allDirentsRelativeToStartPath = await getAllFilesFromStartPath(fullStartPath, {
+      const allDirEntsRelativeToCwd = await getAllDirentsRelativeToCwd(fullStartPath, {
+        cwd: options.cwd,
         fs: options.fs,
       });
 
-      const allDirEntsRelativeToCwd = allDirentsRelativeToStartPath.map(dirent => ({
-        relativeToCwdPath: toPosixPath(
-          // @ts-expect-error
-          path.join(dirent.parentPath || dirent.path, dirent.name),
-        ).replace(`${toPosixPath(options.cwd)}/`, ''),
-        dirent,
-      }));
-
       globEntries.push(...allDirEntsRelativeToCwd);
     } catch (e) {
       if (!options.suppressErrors) {
@@ -262,8 +285,8 @@ export async function optimisedGlob(globOrGlobs, providedOptions = {}) {
     filteredPaths = filteredPaths.map(f => toPosixPath(path.join(options.cwd, f)));
 
     if (process.platform === 'win32') {
-      const driveLetter = path.win32.resolve(options.cwd).slice(0, 1).toUpperCase();
-      filteredPaths = filteredPaths.map(f => `${driveLetter}:${f}`);
+      const driveChar = path.win32.resolve(options.cwd).slice(0, 1).toUpperCase();
+      filteredPaths = filteredPaths.map(f => `${driveChar}:${f}`);
     }
   }
 
@@ -273,10 +296,16 @@ export async function optimisedGlob(globOrGlobs, providedOptions = {}) {
 
   const result = options.unique ? Array.from(new Set(filteredPaths)) : filteredPaths;
 
-  return result.sort((a, b) => {
+  const res = result.sort((a, b) => {
     const pathDiff = a.split('/').length - b.split('/').length;
     return pathDiff !== 0 ? pathDiff : a.localeCompare(b);
   });
+
+  // It could happen the fs changes with the next call, so we clear the cache
+  getAllDirentsRelativeToCwd.clearCache();
+  getAllDirentsFromStartPath.clearCache();
+
+  return res;
 }
 
 optimisedGlob.disableCache = () => {

packages-node/providence-analytics/test-node/program/utils/memoize.test.js

@@ -201,13 +201,13 @@ describe('Memoize', () => {
           sumCalled += 1;
           return { ...a, ...b };
         }
-        const sumMemoized = memoize(sum, { serializeObjects: true });
+        const sumMemoized = memoize(sum);
         let sum2Called = 0;
         function sum2(/** @type {object} a */ a, /** @type {object} a */ b) {
           sum2Called += 1;
           return { ...a, ...b };
         }
-        const sum2Memoized = memoize(sum2, { serializeObjects: true });
+        const sum2Memoized = memoize(sum2);
 
         expect(sumMemoized({ x: 1 }, { y: 2 })).to.deep.equal({ x: 1, y: 2 });
         expect(sumCalled).to.equal(1);
@@ -233,7 +233,7 @@ describe('Memoize', () => {
           sumCalled += 1;
           return { ...a, ...b };
         }
-        const sumMemoized = memoize(sum, { serializeObjects: true });
+        const sumMemoized = memoize(sum);
 
         // Put in cache for args combination
         const result = sumMemoized({ x: 1 }, { y: 2 });
@@ -313,4 +313,33 @@ describe('Memoize', () => {
       expect(sum2Called).to.equal(1);
     });
   });
+
+  describe('Cache', () => {
+    it(`"memoizedFn.clearCache()" clears the cache for a memoized fn"`, async () => {
+      let sumCalled = 0;
+      function sum(/** @type {string} a */ a, /** @type {string} a */ b) {
+        sumCalled += 1;
+        return a + b;
+      }
+      const sumMemoized = memoize(sum);
+
+      // Put in cache for args combination
+      expect(sumMemoized('1', '2')).to.equal('12');
+      expect(sumCalled).to.equal(1);
+
+      // Return from cache
+      expect(sumMemoized('1', '2')).to.equal('12');
+      expect(sumCalled).to.equal(1);
+
+      sumMemoized.clearCache();
+
+      // Now the original function is called again
+      expect(sumMemoized('1', '2')).to.equal('12');
+      expect(sumCalled).to.equal(2);
+
+      // Return from new cache again
+      expect(sumMemoized('1', '2')).to.equal('12');
+      expect(sumCalled).to.equal(2);
+    });
+  });
 });