feat(lib): Cross-platform compatability

package.json

@@ -48,6 +48,7 @@
     "@babel/preset-env": "7.10.4",
     "babel-loader": "8.1.0",
     "babel-plugin-source-map-support": "2.1.2",
+    "cross-spawn": "7.0.3",
     "find-up": "5.0.0",
     "noop2": "2.0.0",
     "source-map-support": "0.5.19",
@@ -58,6 +59,7 @@
   "devDependencies": {
     "@aws-cdk/aws-lambda": "1.54.0",
     "@aws-cdk/core": "1.54.0",
+    "@types/cross-spawn": "6.0.2",
     "@typescript-eslint/eslint-plugin": "^3.7.1",
     "@typescript-eslint/parser": "^3.7.1",
     "eslint-plugin-import": "2.22.0",

src/NodejsFunction.ts

@@ -2,7 +2,7 @@ import * as fs from "fs";
 import * as path from "path";
 import * as os from "os";
 import * as process from "process";
-import { spawnSync } from "child_process";
+import * as spawn from "cross-spawn";
 import findUp from "find-up";
 
 import * as lambda from "@aws-cdk/aws-lambda";
@@ -123,15 +123,20 @@ export class NodejsFunction extends lambda.Function {
       };
     }, {});
 
+    // NodeJs reserves '\' as an escape char; but pluginsPaths etc are inlined directly in the
+    // TemplateString below, so will contain this escape character on paths computed when running
+    // the Construct on a Windows machine, and so we need to escape these chars before writing them
+    const escapePathForNodeJs = (path: string) => path.replace(/\\/g, '\\\\');
+
     const webpackConfiguration = `
     const { builtinModules } = require("module");
     const { NormalModuleReplacementPlugin } = require("${
-      pluginsPaths["webpack"]
+      escapePathForNodeJs(pluginsPaths["webpack"])
     }");
 
     module.exports = {
       mode: "none",
-      entry: "${entryFullPath}",
+      entry: "${escapePathForNodeJs(entryFullPath)}",
       target: "node",
       resolve: {
         modules: ["node_modules", "."],
@@ -144,12 +149,12 @@ export class NodejsFunction extends lambda.Function {
             test: /\\.js$/,
             exclude: /node_modules/,
             use: {
-              loader: "${pluginsPaths["babel-loader"]}",
+              loader: "${escapePathForNodeJs(pluginsPaths["babel-loader"])}",
               options: {
                 cacheDirectory: true,
                 presets: [
                   [
-                    "${pluginsPaths["@babel/preset-env"]}",
+                    "${escapePathForNodeJs(pluginsPaths["@babel/preset-env"])}",
                     {
                       "targets": {
                         "node": "${
@@ -162,8 +167,8 @@ export class NodejsFunction extends lambda.Function {
                   ]
                 ],
                 plugins: [
-                  "${pluginsPaths["@babel/plugin-transform-runtime"]}",
-                  "${pluginsPaths["babel-plugin-source-map-support"]}"
+                  "${escapePathForNodeJs(pluginsPaths["@babel/plugin-transform-runtime"])}",
+                  "${escapePathForNodeJs(pluginsPaths["babel-plugin-source-map-support"])}"
                 ]
               }
             }
@@ -178,15 +183,15 @@ export class NodejsFunction extends lambda.Function {
       externals: [...builtinModules, "aws-sdk"],
       output: {
         filename: "[name].js",
-        path: "${outputDir}",
+        path: "${escapePathForNodeJs(outputDir)}",
         libraryTarget: "commonjs2",
       },
       ${(props.modulesToIgnore &&
         `
       plugins: [
         new NormalModuleReplacementPlugin(
-          /${props.modulesToIgnore.join("|")}/,
-          "${pluginsPaths["noop2"]}",
+          /${escapePathForNodeJs(props.modulesToIgnore.join("|"))}/,
+          "${escapePathForNodeJs(pluginsPaths["noop2"])}",
         ),
       ]
       `) ||
@@ -196,12 +201,12 @@ export class NodejsFunction extends lambda.Function {
     fs.writeFileSync(webpackConfigPath, webpackConfiguration);
 
     // to implement cache, create a script that uses webpack API, store cache in a file with JSON.stringify, based on entry path key then reuse it
-    const webpack = spawnSync(webpackBinPath, ["--config", webpackConfigPath], {
+    const webpack = spawn.sync(webpackBinPath, ["--config", webpackConfigPath], {
       cwd: process.cwd(),
     });
 
     if (webpack.status !== 0) {
-      console.error("webpack had an error when bundling.");
+      console.error(`webpack had an error when bundling. Return status was ${webpack.status}`);
       console.error(
         webpack?.output?.map(out => {
           return out?.toString();

yarn.lock

@@ -1470,6 +1470,13 @@
   resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
   integrity sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==
 
+"@types/[email protected]":
+  version "6.0.2"
+  resolved "https://registry.yarnpkg.com/@types/cross-spawn/-/cross-spawn-6.0.2.tgz#168309de311cd30a2b8ae720de6475c2fbf33ac7"
+  integrity sha512-KuwNhp3eza+Rhu8IFI5HUXRP0LIhqH5cAjubUvGXXthh4YYBuP2ntwEX+Cz8GJoZUHlKo247wPWOfA9LYEq4cw==
+  dependencies:
+    "@types/node" "*"
+
 "@types/eslint-visitor-keys@^1.0.0":
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#1ee30d79544ca84d68d4b3cdb0af4f205663dd2d"
@@ -3869,6 +3876,15 @@ create-hmac@^1.1.0, create-hmac@^1.1.4, create-hmac@^1.1.7:
     safe-buffer "^5.0.1"
     sha.js "^2.4.8"
 
+[email protected], cross-spawn@^7.0.0:
+  version "7.0.3"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.3.tgz#f73a85b9d5d41d045551c177e2882d4ac85728a6"
+  integrity sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==
+  dependencies:
+    path-key "^3.1.0"
+    shebang-command "^2.0.0"
+    which "^2.0.1"
+
 cross-spawn@^5.0.1:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.1.0.tgz#e8bd0efee58fcff6f8f94510a0a554bbfa235449"
@@ -3889,15 +3905,6 @@ cross-spawn@^6.0.0, cross-spawn@^6.0.5:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
-cross-spawn@^7.0.0:
-  version "7.0.3"
-  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.3.tgz#f73a85b9d5d41d045551c177e2882d4ac85728a6"
-  integrity sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==
-  dependencies:
-    path-key "^3.1.0"
-    shebang-command "^2.0.0"
-    which "^2.0.1"
-
 crypto-browserify@^3.11.0:
   version "3.12.0"
   resolved "https://registry.yarnpkg.com/crypto-browserify/-/crypto-browserify-3.12.0.tgz#396cf9f3137f03e4b8e532c58f698254e00f80ec"