From b9ce8b8c04c4e530d1eccb0e09bc182fd914117b Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@spork.org>
Date: Mon, 10 Mar 2025 11:22:33 -0400
Subject: scale: throw when we can't calculate scale.

---
 scale.mjs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scale.mjs b/scale.mjs
index 5341413..485d0c5 100644
--- a/scale.mjs
+++ b/scale.mjs
@@ -18,11 +18,11 @@ function notesBetween(a, b) {
     }
 }
 
+// todo: handle tonics with a flat ‘♭’, so we can deal with [BE]♭.
 function scaleFromIntervals(tonic, intervals) {
     const scaleIndex = chromaticScale.indexOf(tonic);
     if (scaleIndex < 0) {
-        console.error('tonic not found in scale', tonic, chromaticScale);
-        return undefined;
+        throw new Error(`tonic ${tonic} not found in scale ${chromaticScale.toString()}`);
     }
 
     let scale = [tonic];
-- 
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