Add source-map wasm to worker package

Author: rtsao

.gitignore

@@ -1,4 +1,5 @@
 node_modules/
 worker/worker.js
+worker/mappings.wasm
 fixtures/app/static
 yarn-error.log

worker/package.json

@@ -3,13 +3,15 @@
   "version": "1.0.1",
   "main": "worker.js",
   "files": [
-    "worker.js"
+    "worker.js",
+    "mappings.wasm"
   ],
   "scripts": {
-    "prepare": "webpack-cli"
+    "prepare": "webpack-cli && node scripts/copy-wasm.js"
   },
   "devDependencies": {
     "css-to-js-sourcemap-core": "*",
+    "resolve-from": "^4.0.0",
     "webpack": "^4.10.2",
     "webpack-cli": "^2.1.4"
   },

worker/scripts/copy-wasm.js

@@ -0,0 +1,16 @@
+/* eslint-env node */
+
+const path = require("path");
+const fs = require("fs");
+const resolveFrom = require("resolve-from");
+
+const corePath = path.dirname(require.resolve("css-to-js-sourcemap-core"));
+
+const wasmPath = path.join(
+  path.dirname(resolveFrom(corePath, "source-map")),
+  "lib/mappings.wasm",
+);
+
+fs.createReadStream(wasmPath).pipe(
+  fs.createWriteStream(path.resolve(__dirname, "../mappings.wasm")),
+);

yarn.lock

@@ -4207,6 +4207,10 @@ resolve-from@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-3.0.0.tgz#b22c7af7d9d6881bc8b6e653335eebcb0a188748"
 
+resolve-from@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-4.0.0.tgz#4abcd852ad32dd7baabfe9b40e00a36db5f392e6"
+
 resolve-url@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"