From 8821db1daf14eb08bcec8892f3a4c3917cb968b7 Mon Sep 17 00:00:00 2001
From: Martin Pitt <martinpitt@users.noreply.github.com>
Date: Wed, 16 Dec 2020 17:47:20 +0100
Subject: [PATCH] webpack: Check if sassc is installed

If so, show the versions, which may be useful for comparing builds. If
not, show an useful error message. Previously, you were left with ~ 80
identical unintelligible error messages and leftover temporary
directories.

Closes #404
Fixes #391
---
 webpack.config.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/webpack.config.js b/webpack.config.js
index e524c9a..cb58674 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,4 +1,5 @@
 const path = require("path");
+const childProcess = require('child_process');
 const copy = require("copy-webpack-plugin");
 const extract = require("mini-css-extract-plugin");
 const webpack = require("webpack");
@@ -47,6 +48,18 @@ const babel_loader = {
     }
 }
 
+/* check if sassc is available, to avoid unintelligible error messages */
+try {
+    childProcess.execFileSync('sassc', ['--version'], { stdio: ['pipe', 'inherit', 'inherit'] });
+} catch (e) {
+    if (e.code === 'ENOENT') {
+        console.error("ERROR: You need to install the 'sassc' package to build this project.");
+        process.exit(1);
+    } else {
+        throw e;
+    }
+}
+
 module.exports = {
     mode: production ? 'production' : 'development',
     resolve: {