fix: store hashes in module cache

Author: mzgoddard

lib/TransformNormalModulePlugin.js

@@ -28,29 +28,28 @@ const serialResolved = serial.created({
   // loaders: serial.loaders,
 });
 
-const serialResolvedMap = {
-  freeze(arg, module, extra) {
-    const resolved = [];
-    for (const key in arg) {
-      const thawedKey = JSON.parse(key);
-      resolved.push([
-        serialResolveRequest.freeze(thawedKey, thawedKey, extra),
-        serialResolved.freeze(arg[key], arg[key], extra),
-      ]);
-    }
-    return resolved;
+const serialJson = {
+  freeze(arg, value, extra) {
+    return JSON.parse(arg);
   },
   thaw(arg, frozen, extra) {
-    const resolved = {};
-    for (const item of arg) {
-      const key = serialResolveRequest.thaw(item[0], item[0], extra);
-      const value = serialResolved.thaw(item[1], item[1], extra);
-      resolved[JSON.stringify(key)] = value;
-    }
-    return resolved;
+    return JSON.stringify(arg);
   },
 };
 
+const serialMap = serial.map;
+
+const serialResolvedMap = serial.map(
+  serial.pipe(
+    { freeze: serialJson.freeze, thaw: serial.identity.thaw },
+    serialResolveRequest,
+    { freeze: serial.identity.freeze, thaw: serialJson.thaw },
+  ),
+  serialResolved,
+);
+
+const serialResourceHashMap = serial.map(serial.request, serial.identity);
+
 const serialNormalModule4 = serial.serial('NormalModule', {
   constructor: serial.constructed(NormalModule, {
     data: serial.pipe(
@@ -166,6 +165,25 @@ const serialNormalModule4 = serial.serial('NormalModule', {
     _lastSuccessfulBuildMeta: serial.identity,
 
     __hardSource_resolved: serialResolvedMap,
+    __hardSource_oldHashes: serial.pipe(
+      {
+        freeze(arg, module, extra) {
+          const obj = {};
+          const cachedMd5s = compilation.__hardSourceCachedMd5s;
+
+          for (const file of module.buildInfo.fileDependencies) {
+            obj[file] = cachedHashes[file];
+          }
+          for (const dir of module.buildInfo.contextDependencies) {
+            obj[dir] = cachedHashes[dir];
+          }
+
+          return obj;
+        },
+        thaw: serial.identity.thaw,
+      },
+      serialResourceHashMap,
+    ),
   }),
 
   dependencyBlock: serial.dependencyBlock,
@@ -200,7 +218,7 @@ const needRebuild4 = function() {
     return true;
   }
   const fileHashes = this.__hardSourceFileMd5s;
-  const cachedHashes = this.__hardSourceCachedMd5s;
+  const cachedHashes = this.__hardSource_oldHashes;
   const resolvedLast = this.__hardSource_resolved;
   const missingCache = this.__hardSource_missingCache;
 
@@ -348,6 +366,25 @@ const serialNormalModule3 = serial.serial('NormalModule', {
     _source: serial.source,
 
     __hardSource_resolved: serialResolvedMap,
+    __hardSource_oldHashes: serial.pipe(
+      {
+        freeze(arg, module, extra) {
+          const obj = {};
+          const cachedMd5s = extra.compilation.__hardSourceCachedMd5s;
+
+          for (const file of module.fileDependencies) {
+            obj[file] = cachedMd5s[file];
+          }
+          for (const dir of module.contextDependencies) {
+            obj[dir] = cachedMd5s[dir];
+          }
+
+          return obj;
+        },
+        thaw: serial.identity.thaw,
+      },
+      serialResourceHashMap,
+    ),
   }),
 
   hash: {
@@ -392,7 +429,7 @@ const needRebuild3 = function() {
     return true;
   }
   const fileHashes = this.__hardSourceFileMd5s;
-  const cachedHashes = this.__hardSourceCachedMd5s;
+  const cachedHashes = this.__hardSource_oldHashes;
   const resolvedLast = this.__hardSource_resolved;
   const missingCache = this.__hardSource_missingCache;
 
@@ -557,6 +594,7 @@ class TransformNormalModulePlugin {
             module.cacheItem.invalid = false;
             module.cacheItem.invalidReason = null;
           }
+
           const f = serialNormalModule.freeze(
             null,
             module,

lib/util/serial.js

@@ -15,6 +15,28 @@ const pipe = (exports.pipe = (...fns) => ({
   },
 }));
 
+const serialMap = (exports.map = (keyOp, valueOp) => ({
+  freeze(arg, module, extra) {
+    const resolved = [];
+    for (const key in arg) {
+      resolved.push([
+        keyOp.freeze(key, key, extra),
+        valueOp.freeze(arg[key], arg[key], extra),
+      ]);
+    }
+    return resolved;
+  },
+  thaw(arg, frozen, extra) {
+    const resolved = {};
+    for (const item of arg) {
+      const key = keyOp.thaw(item[0], item[0], extra);
+      const value = valueOp.thaw(item[1], item[1], extra);
+      resolved[key] = value;
+    }
+    return resolved;
+  },
+}));
+
 const contextual = (exports.contextual = fnname => {
   const relate = relateContext[`relateNormal${fnname}`];
   const context = relateContext[`contextNormal${fnname}`];