refactor: improve spinner render logic

Author: PeachScript

src/components/InfiniteLoading.vue

@@ -122,9 +122,7 @@ export default {
       type: Number,
       default: config.props.distance,
     },
-    spinner: {
-      type: String,
-    },
+    spinner: String,
     direction: {
       type: String,
       default: config.props.direction,

src/components/Spinner.vue

@@ -70,9 +70,8 @@ export default {
   computed: {
     spinnerView() {
       return (
-        typeof this.$attrs.spinner === 'string'
-          ? SPINNERS[this.$attrs.spinner.toUpperCase()]
-          : this.spinnerInConfig // fallback to spinner of config
+        SPINNERS[(this.$attrs.spinner || '').toUpperCase()]
+        || this.spinnerInConfig // fallback to spinner of config
       );
     },
     spinnerInConfig() {