From 93a7abf160cedea98b1a770c49d6ced9280c400e Mon Sep 17 00:00:00 2001
From: Michael Drury <me@michaeldrury.co.uk>
Date: Fri, 29 Jan 2021 22:56:01 +0000
Subject: [PATCH] Quick fix for number systems in string templates.

---
 packages/string-templates/src/index.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/string-templates/src/index.js b/packages/string-templates/src/index.js
index 8c99990ad7..4f0a607965 100644
--- a/packages/string-templates/src/index.js
+++ b/packages/string-templates/src/index.js
@@ -110,14 +110,17 @@ module.exports.makePropSafe = property => {
  * @returns {boolean} Whether or not the input string is valid.
  */
 module.exports.isValid = string => {
+  const specialCases = ["isNumber", "expected a number"]
   // don't really need a real context to check if its valid
   const context = {}
   try {
     hbsInstance.compile(processors.preprocess(string, false))(context)
     return true
   } catch (err) {
+    const msg = err ? err.message : ""
+    const foundCase = specialCases.find(spCase => msg.includes(spCase))
     // special case for maths functions - don't have inputs yet
-    return !!(err && err.message.includes("isNumber"))
+    return !!foundCase
 
   }
 }