Repository: sverweij/dependency-cruiser
Pull request #860 (2023-11-04 21:35:18)

feat(cache): adds option to compress the cache file
## Description

- adds an option to compress the cache file
- 🏕️ some updates in the cache typing

## Motivation and Context

The cache file can become quite large. The cache file is also _very_ compressible (both gzip and brotli reduce the file size to 10% of the original _or less_). My original hunch was that as less i/o is needed this might constitute a net performance gain for large enough code bases. I haven't been able to substantiate that with evidence, though. 

However, I decided to still let this in because:
- when you switch compression on, it (only) adds a few milliseconds to the total execution time
- the resulting file is so much smaller, that the trade-off of the few extra milliseconds might be worth it for other reasons 

## How Has This Been Tested?

- [x] green ci
- [x] additional automated tests

## Types of changes

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] Documentation only change
- [ ] Refactor (non-breaking change which fixes an issue without changing functionality)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)

## Checklist

- [x] :book:

  - My change doesn't require a documentation update, or ...
  - it _does_ and I have updated it

- [x] :balance_scale:
  - The contribution will be subject to [The MIT license](https://github.com/sverweij/dependency-cruiser/blob/main/LICENSE), and I'm OK with that.
  - The contribution is my own original work.
  - I am ok with the stuff in [**CONTRIBUTING.md**](https://github.com/sverweij/dependency-cruiser/blob/main/.github/CONTRIBUTING.md).


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Patch:
diff --git a/.dependency-cruiser.json b/.dependency-cruiser.json
index c854547a..de2cd87d 100644
--- a/.dependency-cruiser.json
+++ b/.dependency-cruiser.json
@@ -500,7 +500,8 @@
     },
     "progress": { "type": "performance-log", "maximumLevel": 60 },
     "cache": {
-      "strategy": "metadata"
+      "strategy": "metadata",
+      "compress": true
     }
   }
 }
diff --git a/doc/options-reference.md b/doc/options-reference.md
index 8b8bd16d..1506e587 100644
--- a/doc/options-reference.md
+++ b/doc/options-reference.md
@@ -1644,7 +1644,12 @@ The long form:
       // background) or 'content' (which will look at file content (hashes),
       // is slower than 'metadata' and is a bleeding edge feature as of
       // version 12.5.0)
-      strategy: "metadata"
+      strategy: "metadata",
+      // whether or not to compress the cache file. Switching this to true
+      // will make dependency-cruiser a few milliseconds slower over all.
+      // The resulting cache file will be 80-90% smaller though.
+      // Defaults to false (don't compress)
+      compress: false
     }
     // ...
   }
@@ -1668,7 +1673,7 @@ will interpret that as the cache folder.
 }
 ```
 
-If you don't want to use caching you cah leave the cache option out altogether or
+If you don't want to use caching you can leave the cache option out altogether or
 use `cache: false`.
 
 As with most settings the command line option of the same name takes
diff --git a/src/cache/cache.mjs b/src/cache/cache.mjs
index 2f198559..eb9c5630 100644
--- a/src/cache/cache.mjs
+++ b/src/cache/cache.mjs
@@ -1,6 +1,11 @@
 // @ts-check
 import { readFile, mkdir, writeFile } from "node:fs/promises";
 import { join } from "node:path";
+import {
+  brotliCompressSync,
+  brotliDecompressSync,
+  constants as zlibConstants,
+} from "node:zlib";
 import { optionsAreCompatible } from "./options-compatible.mjs";
 import MetadataStrategy from "./metadata-strategy.mjs";
 import ContentStrategy from "./content-strategy.mjs";
@@ -10,17 +15,31 @@ import { scannableExtensions } from "#extract/transpile/meta.mjs";
 import { bus } from "#utl/bus.mjs";
 
 const CACHE_FILE_NAME = "cache.json";
+const EMPTY_CACHE = {
+  modules: [],
+  summary: {
+    error: 0,
+    warn: 0,
+    info: 0,
+    ignore: 0,
+    totalCruised: 0,
+    violations: [],
+    optionsUsed: {},
+  },
+};
 
 export default class Cache {
   /**
    * @param {import("../../types/cache-options.js").cacheStrategyType=} pCacheStrategy
+   * @param {boolean=} pCompress
    */
-  constructor(pCacheStrategy) {
+  constructor(pCacheStrategy, pCompress) {
     this.revisionData = null;
     this.cacheStrategy =
       pCacheStrategy === "content"
         ? new ContentStrategy()
         : new MetadataStrategy();
+    this.compress = pCompress ?? false;
   }
 
   /**
@@ -49,6 +68,8 @@ export default class Cache {
         this.revisionData,
       ) &&
       optionsAreCompatible(
+        // @ts-expect-error ts(2345) - it's indeed not strict cruise options,
+        // but it will do for now (_it works_)
         pCachedCruiseResult.summary.optionsUsed,
         pCruiseOptions,
       )
@@ -61,14 +82,55 @@ export default class Cache {
    */
   async read(pCacheFolder) {
     try {
-      return JSON.parse(
-        await readFile(join(pCacheFolder, CACHE_FILE_NAME), "utf8"),
-      );
+      let lPayload = "";
+      if (this.compress === true) {
+        const lCompressedPayload = await readFile(
+          join(pCacheFolder, CACHE_FILE_NAME),
+        );
+        const lPayloadAsBuffer = brotliDecompressSync(lCompressedPayload);
+        lPayload = lPayloadAsBuffer.toString("utf8");
+      } else {
+        lPayload = await readFile(join(pCacheFolder, CACHE_FILE_NAME), "utf8");
+      }
+      return JSON.parse(lPayload);
     } catch (pError) {
-      return { modules: [], summary: {} };
+      return EMPTY_CACHE;
     }
   }
 
+  /**
+   * @param {string} pPayload
+   * @param {boolean} pCompress
+   * @return {Buffer|string}
+   */
+  #compact(pPayload, pCompress) {
+    if (pCompress) {
+      /**
+       * we landed on brotli with BROTLI_MIN_QUALITY because:
+       * - even with BROTLI_MIN_QUALITY it compresses better than gzip
+       *   (regardless of compression level)
+       * - at BROTLI_MIN_QUALITY it's faster than gzip
+       * - BROTLI_MAX_QUALITY gives a bit better compression but is _much_
+       *   slower than even gzip
+       *
+       * In our situation the sync version is significantly faster than the
+       * async version + zlib functions need to be promisified before they
+       * can be used in promises, which will add the to the execution time
+       * as well.
+       *
+       * As sync or async doesn't _really_
+       * matter for the cli, we're using the sync version here.
+       */
+      return brotliCompressSync(pPayload, {
+        params: {
+          [zlibConstants.BROTLI_PARAM_QUALITY]:
+            zlibConstants.BROTLI_MIN_QUALITY,
+        },
+      });
+    }
+    return pPayload;
+  }
+
   /**
    * @param {string} pCacheFolder
    * @param {import("../../types/dependency-cruiser.js").ICruiseResult} pCruiseResult
@@ -78,15 +140,16 @@ export default class Cache {
     const lRevisionData = pRevisionData ?? this.revisionData;
 
     await mkdir(pCacheFolder, { recursive: true });
-    await writeFile(
-      join(pCacheFolder, CACHE_FILE_NAME),
-      JSON.stringify(
-        this.cacheStrategy.prepareRevisionDataForSaving(
-          pCruiseResult,
-          lRevisionData,
-        ),
+    const lUncompressedPayload = JSON.stringify(
+      this.cacheStrategy.prepareRevisionDataForSaving(
+        pCruiseResult,
+        lRevisionData,
       ),
-      "utf8",
     );
+    let lPayload = this.#compact(lUncompressedPayload, this.compress);
+
+    // relying on writeFile defaults to 'do the right thing' (i.e. utf8
+    // when the payload is a string; raw buffer otherwise)
+    await writeFile(join(pCacheFolder, CACHE_FILE_NAME), lPayload);
   }
 }
diff --git a/src/cache/content-strategy.mjs b/src/cache/content-strategy.mjs
index 45e0cd92..87c783e9 100644
--- a/src/cache/content-strategy.mjs
+++ b/src/cache/content-strategy.mjs
@@ -36,8 +36,8 @@ function refreshChanges(pChanges, pModules) {
       !pModules.some(
         (pModule) =>
           pModule.source === pChange.name &&
-          pModule.checksum === pChange.checksum
-      )
+          pModule.checksum === pChange.checksum,
+      ),
   );
 }
 
@@ -48,10 +48,10 @@ export default class ContentStrategy {
    * @param {import("../../types/strict-options.js").IStrictCruiseOptions} pCruiseOptions
    * @param {Object} pOptions
    * @param {Set<string>} pOptions.extensions
-   * @param {Set<import("watskeburt").changeTypeType>} pOptions.interestingChangeTypes
+   * @param {Set<import("watskeburt").changeTypeType>=} pOptions.interestingChangeTypes?
    * @param {string=} pOptions.baseDir
    * @param {typeof findContentChanges=} pOptions.diffListFn
-   * @param {typeof import('watskeburt').getSHASync=} pOptions.checksumFn
+   * @param {typeof import('watskeburt').getSHA=} pOptions.checksumFn
    * @returns {import("../../types/dependency-cruiser.js").IRevisionData}
    */
   getRevisionData(pDirectory, pCachedCruiseResult, pCruiseOptions, pOptions) {
@@ -89,19 +89,19 @@ export default class ContentStrategy {
         pExistingRevisionData.SHA1 === pNewRevisionData.SHA1 &&
         isDeepStrictEqual(
           pExistingRevisionData.changes,
-          pNewRevisionData.changes
-        )
+          pNewRevisionData.changes,
+        ),
     );
   }
 
   /**
    * @param {import("../../types/dependency-cruiser.js").ICruiseResult} pCruiseResult
-   * @param {import("../../types/dependency-cruiser.js").IRevisionData} pRevisionData
+   * @param {import("../../types/dependency-cruiser.js").IRevisionData=} pRevisionData
    * @returns {import("../../types/dependency-cruiser.js").ICruiseResult}
    */
   prepareRevisionDataForSaving(pCruiseResult, pRevisionData) {
     const lModulesWithCheckSum = pCruiseResult.modules.map(
-      addCheckSumToModule(pCruiseResult.summary.optionsUsed.baseDir)
+      addCheckSumToModule(pCruiseResult.summary.optionsUsed.baseDir),
     );
     const lRevisionData = {
       ...pRevisionData,
diff --git a/src/cache/find-content-changes.mjs b/src/cache/find-content-changes.mjs
index c34d6e76..5af17307 100644
--- a/src/cache/find-content-changes.mjs
+++ b/src/cache/find-content-changes.mjs
@@ -69,6 +69,8 @@ function diffCachedModuleAgainstFileSet(
  * @param {Object} pOptions
  * @param {Set<string>} pOptions.extensions
  * @param {string} pOptions.baseDir
+ * @param {import("../../types/strict-filter-types").IStrictExcludeType} pOptions.exclude
+ * @param {import("../../types/strict-filter-types").IStrictIncludeOnlyType=} pOptions.includeOnly
  * @returns {import("../..").IRevisionChange[]}
  */
 export default function findContentChanges(
diff --git a/src/cache/helpers.mjs b/src/cache/helpers.mjs
index fcb147a4..7bfe83da 100644
--- a/src/cache/helpers.mjs
+++ b/src/cache/helpers.mjs
@@ -4,6 +4,7 @@ import { readFileSync } from "node:fs";
 import { readFile } from "node:fs/promises";
 import { extname } from "node:path";
 import memoize from "lodash/memoize.js";
+// @ts-expect-error ts(2307) - the ts compiler is not privy to the existence of #imports in package.json
 import { filenameMatchesPattern } from "#graph-utl/match-facade.mjs";
 
 /**
@@ -62,7 +63,7 @@ export function addCheckSumToChangeSync(pChange) {
 
 /**
  *
- * @param {import("../../types/strict-filter-types.js").IStrictExcludeType} pExcludeOption
+ * @param {import("../../types/filter-types.js").IExcludeType} pExcludeOption
  * @returns {(pFileName: string) => boolean}
  */
 export function excludeFilter(pExcludeOption) {
@@ -75,7 +76,7 @@ export function excludeFilter(pExcludeOption) {
 }
 
 /**
- * @param {import("../../types/strict-filter-types.js").IStrictIncludeOnlyType} pIncludeOnlyFilter
+ * @param {import("../../types/strict-filter-types.js").IStrictIncludeOnlyType=} pIncludeOnlyFilter
  * @returns {(pFileName: string) => boolean}
  */
 export function includeOnlyFilter(pIncludeOnlyFilter) {
@@ -122,7 +123,7 @@ const DEFAULT_INTERESTING_CHANGE_TYPES = new Set([
 ]);
 
 /**
- * @param {Set<import("watskeburt").changeTypeType>} pInterestingChangeTypes
+ * @param {Set<import("watskeburt").changeTypeType>=} pInterestingChangeTypes
  * @returns {(pChange: import("watskeburt").IChange) => boolean}
  */
 export function isInterestingChangeType(pInterestingChangeTypes) {
diff --git a/src/cache/metadata-strategy.mjs b/src/cache/metadata-strategy.mjs
index f29b1100..fb18474d 100644
--- a/src/cache/metadata-strategy.mjs
+++ b/src/cache/metadata-strategy.mjs
@@ -18,7 +18,7 @@ export default class MetaDataStrategy {
    * @param {import("../../types/cruise-result.js").ICruiseResult} _pCachedCruiseResult
    * @param {Object} pOptions
    * @param {Set<string>} pOptions.extensions
-   * @param {Set<import("watskeburt").changeTypeType>} pOptions.interestingChangeTypes
+   * @param {Set<import("watskeburt").changeTypeType>=} pOptions.interestingChangeTypes
    * @param {typeof getSHA=} pOptions.shaRetrievalFn
    * @param {typeof list=} pOptions.diffListFn
    * @param {typeof addCheckSumToChangeSync=} pOptions.checksumFn
@@ -63,15 +63,19 @@ export default class MetaDataStrategy {
   }
 
   /**
-   * @param {import("../../types/dependency-cruiser.js").IRevisionData} pExistingRevisionData
-   * @param {import("../../types/dependency-cruiser.js").IRevisionData} pNewRevisionData
+   * @param {import("../../types/dependency-cruiser.js").IRevisionData=} pExistingRevisionData
+   * @param {import("../../types/dependency-cruiser.js").IRevisionData=} pNewRevisionData
    * @returns {boolean}
    */
   revisionDataEqual(pExistingRevisionData, pNewRevisionData) {
     return (
       Boolean(pExistingRevisionData) &&
       Boolean(pNewRevisionData) &&
+      // @ts-expect-error ts(18048) - tsc complains pExistingRevisionData &
+      // pNewRevisionData can be undefined, but it should probably get a course
+      // in reading typescript as we've just checked this.
       pExistingRevisionData.SHA1 === pNewRevisionData.SHA1 &&
+      // @ts-expect-error ts(18048)
       isDeepStrictEqual(pExistingRevisionData.changes, pNewRevisionData.changes)
     );
   }
diff --git a/src/main/cruise.mjs b/src/main/cruise.mjs
index 920b8fd4..f95bfb36 100644
--- a/src/main/cruise.mjs
+++ b/src/main/cruise.mjs
@@ -33,7 +33,10 @@ export default async function cruise(
     );
 
     const { default: Cache } = await import("#cache/cache.mjs");
-    lCache = new Cache(lCruiseOptions.cache.strategy);
+    lCache = new Cache(
+      lCruiseOptions.cache.strategy,
+      lCruiseOptions.cache.compress,
+    );
     const lCachedResults = await lCache.read(lCruiseOptions.cache.folder);
 
     if (await lCache.canServeFromCache(lCruiseOptions, lCachedResults)) {
diff --git a/src/schema/configuration.schema.json b/src/schema/configuration.schema.json
index 3e0f6801..32977a33 100644
--- a/src/schema/configuration.schema.json
+++ b/src/schema/configuration.schema.json
@@ -1045,7 +1045,12 @@
           "type": "string",
           "description": "The folder to store the cache in. Defaults to node_modules/.cache/dependency-cruiser"
         },
-        "strategy": { "$ref": "#/definitions/CacheStrategyType" }
+        "strategy": { "$ref": "#/definitions/CacheStrategyType" },
+        "compress": {
+          "type": "boolean",
+          "description": "Whether to compress the cache or not\nSetting this to true will adds a few ms to the execution time, but\ntypically reduces the cache size by 80-90%.\n\nDefaults to false.",
+          "default": false
+        }
       }
     },
     "CacheStrategyType": {
diff --git a/src/schema/configuration.schema.mjs b/src/schema/configuration.schema.mjs
index c34b714e..2644539c 100644
--- a/src/schema/configuration.schema.mjs
+++ b/src/schema/configuration.schema.mjs
@@ -1,1 +1,1 @@
-/* generated - don't edit */export default {"title":"dependency-cruiser configuration","$schema":"http://json-schema.org/draft-07/schema#","$id":"https://dependency-cruiser.js.org/schema/configuration.schema.json","type":"object","additionalProperties":false,"properties":{"$schema":{"type":"string"},"forbidden":{"type":"array","items":{"$ref":"#/definitions/ForbiddenRuleType"}},"allowed":{"type":"array","items":{"$ref":"#/definitions/AllowedRuleType"}},"allowedSeverity":{"$ref":"#/definitions/SeverityType"},"required":{"type":"array","items":{"$ref":"#/definitions/RequiredRuleType"}},"options":{"$ref":"#/definitions/OptionsType"},"extends":{"$ref":"#/definitions/ExtendsType"}},"definitions":{"RuleSetType":{"type":"object","additionalProperties":false,"properties":{"forbidden":{"type":"array","items":{"$ref":"#/definitions/ForbiddenRuleType"}},"allowed":{"type":"array","items":{"$ref":"#/definitions/AllowedRuleType"}},"allowedSeverity":{"$ref":"#/definitions/SeverityType"},"required":{"type":"array","items":{"$ref":"#/definitions/RequiredRuleType"}}}},"AllowedRuleType":{"oneOf":[{"$ref":"#/definitions/RegularAllowedRuleType"},{"$ref":"#/definitions/ReachabilityAllowedRuleType"}]},"RegularAllowedRuleType":{"type":"object","required":["from","to"],"additionalProperties":false,"properties":{"comment":{"type":"string"},"scope":{"type":"string","enum":["module","folder"]},"from":{"$ref":"#/definitions/FromRestrictionType"},"to":{"$ref":"#/definitions/ToRestrictionType"}}},"ReachabilityAllowedRuleType":{"type":"object","required":["from","to"],"additionalProperties":false,"properties":{"comment":{"type":"string"},"scope":{"type":"string","enum":["module","folder"]},"from":{"$ref":"#/definitions/ReachabilityFromRestrictionType"},"to":{"$ref":"#/definitions/ReachabilityToRestrictionType"}}},"ForbiddenRuleType":{"oneOf":[{"$ref":"#/definitions/RegularForbiddenRuleType"},{"$ref":"#/definitions/ReachabilityForbiddenRuleType"},{"$ref":"#/definitions/DependentsForbiddenRuleType"}]},"RegularForbiddenRuleType":{"type":"object","required":["from","to"],"additionalProperties":false,"properties":{"name":{"type":"string"},"severity":{"$ref":"#/definitions/SeverityType"},"scope":{"type":"string","enum":["module","folder"]},"comment":{"type":"string"},"from":{"$ref":"#/definitions/FromRestrictionType"},"to":{"$ref":"#/definitions/ToRestrictionType"}}},"DependentsForbiddenRuleType":{"type":"object","required":["module","from"],"additionalProperties":false,"properties":{"name":{"type":"string"},"severity":{"$ref":"#/definitions/SeverityType"},"scope":{"type":"string","enum":["module","folder"]},"comment":{"type":"string"},"module":{"$ref":"#/definitions/DependentsModuleRestrictionType"},"from":{"$ref":"#/definitions/DependentsFromRestrictionType"}}},"ReachabilityForbiddenRuleType":{"type":"object","required":["from","to"],"additionalProperties":false,"properties":{"name":{"type":"string"},"severity":{"$ref":"#/definitions/SeverityType"},"scope":{"type":"string","enum":["module","folder"]},"comment":{"type":"string"},"from":{"$ref":"#/definitions/ReachabilityFromRestrictionType"},"to":{"$ref":"#/definitions/ReachabilityToRestrictionType"}}},"RequiredRuleType":{"type":"object","required":["module","to"],"additionalProperties":false,"properties":{"name":{"type":"string"},"severity":{"$ref":"#/definitions/SeverityType"},"scope":{"type":"string","enum":["module","folder"]},"comment":{"type":"string"},"module":{"$ref":"#/definitions/RequiredModuleRestrictionType"},"to":{"$ref":"#/definitions/RequiredToRestrictionType"}}},"FromRestrictionType":{"type":"object","additionalProperties":false,"properties":{"path":{"$ref":"#/definitions/REAsStringsType"},"pathNot":{"$ref":"#/definitions/REAsStringsType"},"orphan":{"type":"boolean"}}},"ReachabilityFromRestrictionType":{"type":"object","additionalProperties":false,"properties":{"path":{"$ref":"#/definitions/REAsStringsType"},"pathNot":{"$ref":"#/definitions/REAsStringsType"}}},"ToRestrictionType":{"type":"object","additionalProperties":false,"properties":{"path":{"$ref":"#/definitions/REAsStringsType"},"pathNot":{"$ref":"#/definitions/REAsStringsType"},"couldNotResolve":{"type":"boolean"},"circular":{"type":"boolean"},"dynamic":{"type":"boolean"},"exoticallyRequired":{"type":"boolean"},"exoticRequire":{"$ref":"#/definitions/REAsStringsType"},"exoticRequireNot":{"$ref":"#/definitions/REAsStringsType"},"preCompilationOnly":{"type":"boolean"},"dependencyTypes":{"type":"array","items":{"$ref":"#/definitions/DependencyTypeType"}},"dependencyTypesNot":{"type":"array","items":{"$ref":"#/definitions/DependencyTypeType"}},"moreThanOneDependencyType":{"type":"boolean"},"license":{"$ref":"#/definitions/REAsStringsType"},"licenseNot":{"$ref":"#/definitions/REAsStringsType"},"via":{"$ref":"#/definitions/REAsStringsType"},"viaOnly":{"$ref":"#/definitions/REAsStringsType"},"viaNot":{"$ref":"#/definitions/REAsStringsType"},"viaSomeNot":{"$ref":"#/definitions/REAsStringsType"},"moreUnstable":{"type":"boolean"}}},"DependentsModuleRestrictionType":{"required":[],"type":"object","addi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diff --git a/src/schema/cruise-result.schema.json b/src/schema/cruise-result.schema.json
index db1b5c2d..128db541 100644
--- a/src/schema/cruise-result.schema.json
+++ b/src/schema/cruise-result.schema.json
@@ -1410,7 +1410,12 @@
           "type": "string",
           "description": "The folder to store the cache in. Defaults to node_modules/.cache/dependency-cruiser"
         },
-        "strategy": { "$ref": "#/definitions/CacheStrategyType" }
+        "strategy": { "$ref": "#/definitions/CacheStrategyType" },
+        "compress": {
+          "type": "boolean",
+          "description": "Whether to compress the cache or not\nSetting this to true will adds a few ms to the execution time, but\ntypically reduces the cache size by 80-90%.\n\nDefaults to false.",
+          "default": false
+        }
       }
     },
     "CacheStrategyType": {
diff --git a/src/schema/cruise-result.schema.mjs b/src/schema/cruise-result.schema.mjs
index 16c58530..fe9a481e 100644
--- a/src/schema/cruise-result.schema.mjs
+++ b/src/schema/cruise-result.schema.mjs
@@ -1,1 +1,1 @@
-/* generated - don't edit */export default {"title":"dependency-cruiser output 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cyTypesNot":{"type":"array","items":{"$ref":"#/definitions/DependencyTypeType"}},"moreThanOneDependencyType":{"type":"boolean"},"license":{"$ref":"#/definitions/REAsStringsType"},"licenseNot":{"$ref":"#/definitions/REAsStringsType"},"via":{"$ref":"#/definitions/REAsStringsType"},"viaOnly":{"$ref":"#/definitions/REAsStringsType"},"viaNot":{"$ref":"#/definitions/REAsStringsType"},"viaSomeNot":{"$ref":"#/definitions/REAsStringsType"},"moreUnstable":{"type":"boolean"}}},"DependentsModuleRestrictionType":{"required":[],"type":"object","additionalProperties":false,"properties":{"path":{"$ref":"#/definitions/REAsStringsType"},"pathNot":{"$ref":"#/definitions/REAsStringsType"},"numberOfDependentsLessThan":{"type":"integer","minimum":0,"maximum":100},"numberOfDependentsMoreThan":{"type":"integer","minimum":0,"maximum":100}}},"DependentsFromRestrictionType":{"required":[],"type":"object","additionalProperties":false,"properties":{"path":{"$ref":"#/definitions/REAsStringsType"},"pathNot":{"$ref":"#/definitions/REAsStringsType"}}},"ReachabilityToRestrictionType":{"required":["reachable"],"type":"object","additionalProperties":false,"properties":{"path":{"$ref":"#/definitions/REAsStringsType"},"pathNot":{"$ref":"#/definitions/REAsStringsType"},"reachable":{"type":"boolean"}}},"RequiredModuleRestrictionType":{"required":[],"type":"object","additionalProperties":false,"properties":{"path":{"$ref":"#/definitions/REAsStringsType"},"pathNot":{"$ref":"#/definitions/REAsStringsType"}}},"RequiredToRestrictionType":{"required":[],"type":"object","additionalProperties":false,"properties":{"path":{"$ref":"#/definitions/REAsStringsType"}}},"REAsStringsType":{"oneOf":[{"type":"string"},{"type":"array","items":{"type":"string"}}]},"OptionsUsedType":{"type":"object","additionalProperties":false,"properties":{"doNotFollow":{"$ref":"#/definitions/CompoundDoNotFollowType"},"exclude":{"$ref":"#/definitions/CompoundExcludeType"},"includeOnly":{"oneOf":[{"$ref":"#/definitions/REAsStringsType"},{"$ref":"#/definitions/CompoundIncludeOnlyType"}]},"focus":{"$ref":"#/definitions/CompoundFocusType"},"reaches":{"$ref":"#/definitions/CompoundReachesType"},"highlight":{"$ref":"#/definitions/CompoundHighlightType"},"knownViolations":{"$ref":"#/definitions/ViolationsType"},"collapse":{"type":"string"},"maxDepth":{"type":"integer","minimum":0,"maximum":99},"moduleSystems":{"$ref":"#/definitions/ModuleSystemsType"},"prefix":{"type":"string"},"preserveSymlinks":{"type":"boolean"},"combinedDependencies":{"type":"boolean"},"tsConfig":{"type":"object","additionalProperties":false,"properties":{"fileName":{"type":"string"}}},"tsPreCompilationDeps":{"oneOf":[{"type":"boolean"},{"type":"string","enum":["specify"]}]},"extraExtensionsToScan":{"type":"array","items":{"type":"string"}},"externalModuleResolutionStrategy":{"type":"string","enum":["node_modules","yarn-pnp"]},"builtInModules":{"type":"object","additionalProperties":false,"properties":{"override":{"type":"array","items":{"type":"string"}},"add":{"type":"array","items":{"type":"string"}}}},"forceDeriveDependents":{"type":"boolean"},"webpackConfig":{"type":"object","additionalProperties":false,"properties":{"fileName":{"type":"string"},"env":{"oneOf":[{"type":"object"},{"type":"string"}]},"arguments":{"type":"object"}}},"enhancedResolveOptions":{"type":"object","additionalProperties":false,"properties":{"exportsFields":{"type":"array","items":{"type":"string"}},"conditionNames":{"type":"array","items":{"type":"string"}},"extensions":{"type":"array","items":{"type":"string"}},"mainFields":{"type":"array"},"mainFiles":{"type":"array"},"cachedInputFileSystem":{"type":"object","additionalProperties":false,"properties":{"cacheDuration":{"type":"integer","minimum":0,"maximum":1800000}}}}},"babelConfig":{"type":"object","additionalProperties":false,"properties":{"fileName":{"type":"string"}}},"parser":{"type":"string","enum":["acorn","swc","tsc"]},"exoticRequireStrings":{"type":"array","items":{"type":"string"}},"reporterOptions":{"$ref":"#/definitions/ReporterOptionsType"},"progress":{"type":"object","additionalProperties":false,"properties":{"type":{"type":"string","enum":["cli-feedback","performance-log","ndjson","none"]},"maximumLevel":{"type":"number","enum":[-1,40,50,60,70,80,99]}}},"metrics":{"type":"boolean"},"baseDir":{"type":"string"},"cache":{"oneOf":[{"type":"boolean","enum":[false]},{"$ref":"#/definitions/CacheOptionsType"}]},"args":{"type":"string"},"rulesFile":{"type":"string"},"outputTo":{"type":"string"},"outputType":{"$ref":"#/definitions/OutputType"}}},"ModuleSystemsType":{"type":"array","items":{"$ref":"#/definitions/ModuleSystemType"}},"OutputType":{"oneOf":[{"type":"string","enum":["json","html","dot","ddot","cdot","archi","fdot","flat","csv","err","err-long","err-html","teamcity","anon","text","metrics","markdown","mermaid","d2","null"]},{"type":"string","pattern":"^plugin:[^:]+$"}]},"CompoundExcludeType":{"type":"object","additionalProperties":false,"properties":{"path":{"$ref":"#/defini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\ No newline at end of file
diff --git a/tools/schema/cache-options.mjs b/tools/schema/cache-options.mjs
index e1b21a56..51a2a913 100644
--- a/tools/schema/cache-options.mjs
+++ b/tools/schema/cache-options.mjs
@@ -13,6 +13,16 @@ export default {
             "node_modules/.cache/dependency-cruiser",
         },
         strategy: { $ref: "#/definitions/CacheStrategyType" },
+        compress: {
+          type: "boolean",
+          description:
+            "Whether to compress the cache or not\n" +
+            "Setting this to true will adds a few ms to the execution time, but\n" +
+            "typically reduces the cache size by 80-90%.\n" +
+            "\n" +
+            "Defaults to false.",
+          default: false,
+        },
       },
     },
     ...cacheStrategyType.definitions,
diff --git a/types/cache-options.d.ts b/types/cache-options.d.ts
index 5af0fca7..813f952f 100644
--- a/types/cache-options.d.ts
+++ b/types/cache-options.d.ts
@@ -19,4 +19,13 @@ export interface ICacheOptions {
    * Defaults to 'metadata'
    */
   strategy: cacheStrategyType;
+  /**
+   * Whether to compress the cache or not
+   *
+   *  Setting this to true adds a few ms to the execution time, but
+   * typically reduces the cache size by 80-90%.
+   *
+   * Defaults to false.
+   */
+  compress: boolean;
 }


Test patch:
diff --git a/test/cache/cache.spec.mjs b/test/cache/cache.spec.mjs
index dd8c7da1..52c16098 100644
--- a/test/cache/cache.spec.mjs
+++ b/test/cache/cache.spec.mjs
@@ -1,27 +1,36 @@
 import { deepEqual, equal } from "node:assert/strict";
-import { rmSync } from "node:fs";
+import { readFileSync, rmSync } from "node:fs";
 import { join } from "node:path";
-import { isDeepStrictEqual } from "node:util";
+import { brotliDecompressSync } from "node:zlib";
 import { describe } from "mocha";
 import Cache from "#cache/cache.mjs";
 
 const OUTPUTS_FOLDER = "test/cache/__outputs__/";
+const EMPTY_CACHE = {
+  modules: [],
+  summary: {
+    error: 0,
+    warn: 0,
+    info: 0,
+    ignore: 0,
+    totalCruised: 0,
+    violations: [],
+    optionsUsed: {},
+  },
+};
 
 describe("[I] cache/cache - readCache", () => {
   it("returns an empty cache when trying to read from a non-existing one", async () => {
     const lCache = new Cache();
-    deepEqual(await lCache.read("this/folder/does/not-exist"), {
-      modules: [],
-      summary: {},
-    });
+    deepEqual(await lCache.read("this/folder/does/not-exist"), EMPTY_CACHE);
   });
 
   it("returns an empty cache when trying to read from a file that is invalid JSON", async () => {
     const lCache = new Cache();
-    deepEqual(await lCache.read("test/cache/__mocks__/cache/invalid-json"), {
-      modules: [],
-      summary: {},
-    });
+    deepEqual(
+      await lCache.read("test/cache/__mocks__/cache/invalid-json"),
+      EMPTY_CACHE,
+    );
   });
 
   it("returns the contents of the cache when trying to read from an existing, valid json", async () => {
@@ -84,7 +93,7 @@ describe("[I] cache/cache - writeCache", () => {
     const lRevisionData = { SHA1: "dummy-sha", changes: [] };
 
     await lCache.write(lCacheFolder, lDummyCacheContents, lRevisionData);
-    isDeepStrictEqual(await lCache.read(lCacheFolder), lDummyCacheContents);
+    deepEqual(await lCache.read(lCacheFolder), lDummyCacheContents);
   });
 });
 
@@ -198,3 +207,80 @@ describe("[I] cache/cache - canServeFromCache", () => {
     equal(lFound, true);
   });
 });
+
+describe("[I] cache/cache - compression", () => {
+  before("remove __outputs__ folder", () => {
+    rmSync(OUTPUTS_FOLDER, { recursive: true, force: true });
+  });
+  after("remove __outputs__ folder", () => {
+    rmSync(OUTPUTS_FOLDER, { recursive: true, force: true });
+  });
+
+  const lCacheFolderContent = {
+    modules: [],
+    summary: { optionsUsed: { baseDir: "test/cache/__mocks__/cache" } },
+    revisionData: { SHA1: "dummy-sha", changes: [] },
+  };
+
+  it("read & write remain transparent when pCompress === true", async () => {
+    const lCache = new Cache("metadata", true);
+    const lCacheFolder = join(OUTPUTS_FOLDER, "compression-transparent-true");
+    await lCache.write(lCacheFolder, lCacheFolderContent);
+    deepEqual(await lCache.read(lCacheFolder), lCacheFolderContent);
+  });
+
+  it("read & write remain transparent when pCompress === false", async () => {
+    const lCache = new Cache("metadata", false);
+    const lCacheFolder = join(OUTPUTS_FOLDER, "compression-transparent-false");
+    await lCache.write(lCacheFolder, lCacheFolderContent);
+    deepEqual(await lCache.read(lCacheFolder), lCacheFolderContent);
+  });
+
+  it("compresses the cache when pCompress === true", async () => {
+    const lCacheFolder = join(OUTPUTS_FOLDER, "compression-compress-when-true");
+    const lCache = new Cache("metadata", true);
+    await lCache.write(lCacheFolder, lCacheFolderContent);
+    const lCompressedCacheContents = readFileSync(
+      join(lCacheFolder, "cache.json"),
+    );
+    const lCacheContentsString = brotliDecompressSync(
+      lCompressedCacheContents,
+    ).toString("utf8");
+    const lCacheContents = JSON.parse(lCacheContentsString);
+    deepEqual(lCacheContents, lCacheFolderContent);
+  });
+
+  it("does _not_ compress the cache when pCompress is false", async () => {
+    const lCacheFolder = join(
+      OUTPUTS_FOLDER,
+      "compression-no-compress-when-false",
+    );
+    const lCache = new Cache("metadata", false);
+    await lCache.write(lCacheFolder, lCacheFolderContent);
+    const lCacheContentsString = readFileSync(
+      join(lCacheFolder, "cache.json"),
+      {
+        encoding: "utf8",
+      },
+    );
+    const lCacheContents = JSON.parse(lCacheContentsString);
+    deepEqual(lCacheContents, lCacheFolderContent);
+  });
+
+  it("does _not_ compress the cache when pCompress isn't provided", async () => {
+    const lCacheFolder = join(
+      OUTPUTS_FOLDER,
+      "compression-no-compress-when-not-provided",
+    );
+    const lCache = new Cache("metadata");
+    await lCache.write(lCacheFolder, lCacheFolderContent);
+    const lCacheContentsString = readFileSync(
+      join(lCacheFolder, "cache.json"),
+      {
+        encoding: "utf8",
+      },
+    );
+    const lCacheContents = JSON.parse(lCacheContentsString);
+    deepEqual(lCacheContents, lCacheFolderContent);
+  });
+});