Upgrade Webpack to 4.29.0 with FutureEmitAssets for Massive Memory Optimizations (#6114)

We want our new memory optimizations (https://github.com/webpack/webpack/pull/8609)

packages/next/build/webpack-config.js

@@ -228,6 +228,7 @@ export default async function getBaseWebpackConfig (dir, {dev = false, isServer
       chunkFilename: isServer ? `${dev ? '[name]' : '[name].[contenthash]'}.js` : `static/chunks/${dev ? '[name]' : '[name].[contenthash]'}.js`,
       strictModuleExceptionHandling: true,
       crossOriginLoading: config.crossOrigin,
+      futureEmitAssets: !dev,
       webassemblyModuleFilename: 'static/wasm/[modulehash].wasm'
     },
     performance: { hints: false },

packages/next/package.json

@@ -84,7 +84,7 @@
     "tty-aware-progress": "1.0.3",
     "unfetch": "3.0.0",
     "url": "0.11.0",
-    "webpack": "4.28.2",
+    "webpack": "4.29.0",
     "webpack-dev-middleware": "3.4.0",
     "webpack-hot-middleware": "2.24.3",
     "webpack-sources": "1.3.0",

yarn.lock

@@ -1742,12 +1742,10 @@ accepts@~1.3.5:
     mime-types "~2.1.18"
     negotiator "0.6.1"
 
-acorn-dynamic-import@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/acorn-dynamic-import/-/acorn-dynamic-import-3.0.0.tgz#901ceee4c7faaef7e07ad2a47e890675da50a278"
-  integrity sha512-zVWV8Z8lislJoOKKqdNMOB+s6+XV5WERty8MnKBeFgwA+19XJjJHs2RP5dzM57FftIs+jQnRToLiWazKr6sSWg==
-  dependencies:
-    acorn "^5.0.0"
+acorn-dynamic-import@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/acorn-dynamic-import/-/acorn-dynamic-import-4.0.0.tgz#482210140582a36b83c3e342e1cfebcaa9240948"
+  integrity sha512-d3OEjQV4ROpoflsnUA8HozoIR504TFxNivYEUi6uwz0IYhBkTDXGuWlNdMtybRt3nqVx/L6XqMt0FxkXuWKZhw==
 
 acorn-globals@^4.1.0:
   version "4.3.0"
@@ -1774,7 +1772,7 @@ acorn@^3.0.4:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-3.3.0.tgz#45e37fb39e8da3f25baee3ff5369e2bb5f22017a"
   integrity sha1-ReN/s56No/JbruP/U2niu18iAXo=
 
-acorn@^5.0.0, acorn@^5.5.0, acorn@^5.5.3, acorn@^5.6.2, acorn@^5.7.3:
+acorn@^5.5.0, acorn@^5.5.3, acorn@^5.7.3:
   version "5.7.3"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
   integrity sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==
@@ -1784,6 +1782,11 @@ acorn@^6.0.1:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.0.4.tgz#77377e7353b72ec5104550aa2d2097a2fd40b754"
   integrity sha512-VY4i5EKSKkofY2I+6QLTbTTN/UvEQPCo6eiwzzSaSWfpaDhOmStMCMod6wmuPciNq+XS0faCglFu2lHZpdHUtg==
 
+acorn@^6.0.5:
+  version "6.0.5"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.0.5.tgz#81730c0815f3f3b34d8efa95cb7430965f4d887a"
+  integrity sha512-i33Zgp3XWtmZBMNvCr4azvOFeWVw1Rk6p3hfi3LUDvIFraOMywb1kAtrbi+med14m4Xfpqm3zRZMT+c0FNE7kg==
+
 after-all-results@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/after-all-results/-/after-all-results-2.0.0.tgz#6ac2fc202b500f88da8f4f5530cfa100f4c6a2d0"
@@ -12012,17 +12015,17 @@ webpack-sources@1.3.0, webpack-sources@^1.0.1, webpack-sources@^1.1.0, webpack-s
     source-list-map "^2.0.0"
     source-map "~0.6.1"
 
-webpack@4.28.2:
-  version "4.28.2"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.28.2.tgz#6b534a8bc91a45787ed631dc2e87aec94e9e4db7"
-  integrity sha512-PK3uVg3/NuNVOjPfYleFI6JF7khO7c2kIlksH7mivQm+QDcwiqV1x6+q89dDeOioh5FNxJHr3LKbDu3oSAhl9g==
+webpack@4.29.0:
+  version "4.29.0"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.29.0.tgz#f2cfef83f7ae404ba889ff5d43efd285ca26e750"
+  integrity sha512-pxdGG0keDBtamE1mNvT5zyBdx+7wkh6mh7uzMOo/uRQ/fhsdj5FXkh/j5mapzs060forql1oXqXN9HJGju+y7w==
   dependencies:
     "@webassemblyjs/ast" "1.7.11"
     "@webassemblyjs/helper-module-context" "1.7.11"
     "@webassemblyjs/wasm-edit" "1.7.11"
     "@webassemblyjs/wasm-parser" "1.7.11"
-    acorn "^5.6.2"
-    acorn-dynamic-import "^3.0.0"
+    acorn "^6.0.5"
+    acorn-dynamic-import "^4.0.0"
     ajv "^6.1.0"
     ajv-keywords "^3.1.0"
     chrome-trace-event "^1.0.0"