simplify

Author: domoritz

src/aggregate.ts

@@ -50,11 +50,11 @@ export type NonArgAggregateOp = Exclude<AggregateOp, 'argmin' | 'argmax'>;
 export type Aggregate = NonArgAggregateOp | ArgmaxDef | ArgminDef;
 
 export function isArgminDef(a: Aggregate | string): a is ArgminDef {
-  return !!a && hasKey(a, 'argmin');
+  return hasKey(a, 'argmin');
 }
 
 export function isArgmaxDef(a: Aggregate | string): a is ArgmaxDef {
-  return !!a && hasKey(a, 'argmax');
+  return hasKey(a, 'argmax');
 }
 
 export function isAggregateOp(a: string | ArgminDef | ArgmaxDef): a is AggregateOp {

src/compile/scale/parse.ts

@@ -54,7 +54,7 @@ function parseUnitScaleCore(model: UnitModel): ScaleComponentIndex {
       continue;
     }
 
-    let specifiedScale = (fieldOrDatumDef as any)?.scale;
+    let specifiedScale = fieldOrDatumDef && (fieldOrDatumDef as any).scale;
     if (fieldOrDatumDef && specifiedScale !== null && specifiedScale !== false) {
       specifiedScale ??= {};
       const hasNestedOffsetScale = channelHasNestedOffsetScale(encoding, channel);

src/config.ts

@@ -734,8 +734,10 @@ export function stripAndRedirectConfig(config: Config<SignalRef>) {
   redirectTitleConfig(config);
 
   // Remove empty config objects.
-  for (const prop of keys(config)) {
+  for (const prop in config) {
+    // @ts-ignore
     if (isObject(config[prop]) && isEmpty(config[prop])) {
+      // @ts-ignore
       delete config[prop];
     }
   }