diff --git a/packages/near-membrane-base/src/membrane.ts b/packages/near-membrane-base/src/membrane.ts
index fd265b1d..a3f34d36 100644
--- a/packages/near-membrane-base/src/membrane.ts
+++ b/packages/near-membrane-base/src/membrane.ts
@@ -335,7 +335,7 @@ export function createMembraneMarshall(isInShadowRealm?: boolean) {
                 // Safari 12 on iOS 12.1 has a `this` of `undefined` so we
                 // fallback to `self`.
                 // eslint-disable-next-line no-restricted-globals
-                return this || self;
+                return this ?? self;
             },
         } as PropertyDescriptor),
         globalThis);
diff --git a/packages/near-membrane-dom/src/browser-realm.ts b/packages/near-membrane-dom/src/browser-realm.ts
index 13f850bb..31cdaa41 100644
--- a/packages/near-membrane-dom/src/browser-realm.ts
+++ b/packages/near-membrane-dom/src/browser-realm.ts
@@ -67,7 +67,7 @@ function createDetachableIframe(): HTMLIFrameElement {
     // It is impossible to test whether the NodeProtoLastChildGetter branch is
     // reached in a normal Karma test environment.
     const parent =
-        ReflectApply(DocumentProtoBodyGetter, docRef, []) ||
+        ReflectApply(DocumentProtoBodyGetter, docRef, []) ??
         /* istanbul ignore next */ ReflectApply(NodeProtoLastChildGetter, docRef, []);
     const style = ReflectApply(HTMLElementProtoStyleGetter, iframe, []);
     style.display = 'none';
diff --git a/scripts/rollup/plugins/babel-output.cjs b/scripts/rollup/plugins/babel-output.cjs
index da2915f9..bb1c1804 100644
--- a/scripts/rollup/plugins/babel-output.cjs
+++ b/scripts/rollup/plugins/babel-output.cjs
@@ -31,8 +31,8 @@ module.exports = {
                     // https://github.com/babel/babel/blob/v7.15.6/packages/babel-core/src/config/files/configuration.ts#L24
                     const configPath =
                         // prettier-ignore
-                        options.configFile ||
-                        (await globby([`${path.resolve('.babelrc')}{,.js,.cjs,.mjs,.json}`]))[0] ||
+                        options.configFile ??
+                        (await globby([`${path.resolve('.babelrc')}{,.js,.cjs,.mjs,.json}`]))[0] ??
                         (await globby([`${path.resolve(rootPath, 'babel.config')}{.js,.cjs,.mjs,.json}`]))[0];
                     const config =
                         path.extname(configPath) === '.json'