diff --git a/packages/string-templates/src/index.ts b/packages/string-templates/src/index.ts
index 67ec194e84..3796d8f155 100644
--- a/packages/string-templates/src/index.ts
+++ b/packages/string-templates/src/index.ts
@@ -113,7 +113,7 @@ export async function processObject(
 export async function processString(
   string: string,
   context: object,
-  opts?: { noHelpers?: boolean; escapeNewlines?: boolean; onlyFound?: boolean }
+  opts?: ProcessOptions
 ) {
   // TODO: carry out any async calls before carrying out async call
   return processStringSync(string, context, opts)
@@ -156,7 +156,7 @@ export function processObjectSync(
 export function processStringSync(
   string: string,
   context: object,
-  opts?: { noHelpers?: boolean; escapeNewlines?: boolean; onlyFound: any }
+  opts?: ProcessOptions
 ) {
   // Take a copy of input in case of error
   const input = string
@@ -397,7 +397,7 @@ export function convertToJS(hbs: string) {
     prevBlock = block
     const { variable, value } = convertHBSBlock(block, count++)
     variables[variable] = value
-    js += `${stringPart.split()}\${${variable}}`
+    js += `${stringPart.split("")}\${${variable}}`
   }
   let varBlock = ""
   for (let [variable, value] of Object.entries(variables)) {
diff --git a/packages/string-templates/src/types.ts b/packages/string-templates/src/types.ts
index fc029f3b6a..1e1ef048a4 100644
--- a/packages/string-templates/src/types.ts
+++ b/packages/string-templates/src/types.ts
@@ -4,4 +4,5 @@ export interface ProcessOptions {
   noHelpers?: boolean
   noFinalise?: boolean
   escapeNewlines?: boolean
+  onlyFound?: boolean
 }