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-rw-r--r--ext/fg/js/source.js14
1 files changed, 12 insertions, 2 deletions
diff --git a/ext/fg/js/source.js b/ext/fg/js/source.js
index 11d3ff0e..fa785ec4 100644
--- a/ext/fg/js/source.js
+++ b/ext/fg/js/source.js
@@ -82,7 +82,11 @@ class TextSourceRange {
}
equals(other) {
- if (other === null) {
+ if (!(
+ typeof other === 'object' &&
+ other !== null &&
+ other instanceof TextSourceRange
+ )) {
return false;
}
if (this.imposterSourceElement !== null) {
@@ -409,6 +413,12 @@ class TextSourceElement {
}
equals(other) {
- return other && other.element === this.element && other.content === this.content;
+ return (
+ typeof other === 'object' &&
+ other !== null &&
+ other instanceof TextSourceElement &&
+ other.element === this.element &&
+ other.content === this.content
+ );
}
}