jslint fixes

Author: ddooley

lib/AppContext.js

@@ -1446,7 +1446,7 @@ export default class AppContext {
     // Changes may include any key slots (not just foreign keys), but other
     // slots are ignored.
     let changed_keys = Object.fromEntries(Object.entries(key_vals)
-      .filter(([slot_name]) => changes.hasOwnProperty(slot_name))
+      .filter(([slot_name]) => Object.prototype.hasOwnProperty.call(changes, slot_name))
       .map(([slot_name]) => ([slot_name, changes[slot_name].value]))
     );
 
@@ -1519,7 +1519,7 @@ export default class AppContext {
             // For all dependents, changes if any come from parent table(s).
             // Parent field names are different though - via relations!
             let parent_slot_name = key_mapping.foreign_slot;
-            if (parent_changes.hasOwnProperty(parent_slot_name)) {
+            if (Object.prototype.hasOwnProperty.call(parent_changes, parent_slot_name)) {
               changed_dep_keys[slot_name] = parent_changes[parent_slot_name];
             }
           }

lib/Toolbar.js

@@ -16,7 +16,7 @@ import 'bootstrap/js/dist/dropdown';
 import 'bootstrap/js/dist/modal';
 import '@selectize/selectize';
 import '@selectize/selectize/dist/css/selectize.bootstrap4.css';
-const nestedProperty = require('nested-property');
+import nestedProperty from 'nested-property';
 import {isEmpty, deleteEmptyKeyVals, isEmptyUnitVal, setJSON} from '../lib/utils/general';
 import YAML from 'yaml';
 import {
@@ -517,7 +517,7 @@ class Toolbar {
     if (!this.file_extensions.includes(ext)) {
       this.showError(
         'open',
-        `Only ${acceptedExts.join(', ')} files are supported`
+        `Only ${this.file_extensions.join(', ')} files are supported`
       );
       return;
     }
@@ -570,7 +570,6 @@ class Toolbar {
     } 
     catch (error) {
       throw new Error('Invalid JSON data', error);
-      return false;
     }
 
     // Validate whether data file has minimum necessary Schema components.
@@ -676,7 +675,6 @@ class Toolbar {
     }
     catch (error) {
       throw new Error('Invalid spreadsheet data', error);
-      return false;
     }
 
     // First construct a set of data tables from input file's perspective
@@ -1017,9 +1015,10 @@ class Toolbar {
     if (isEmpty(value_list))
       return value;
 
-    if (!(value in value_list))
+    if (!(value in value_list)) {
       console.warn(`${value} not in slot.sources`, value_list);
       return value;
+    }
 
     if (file_extension === 'json')
       return value; // Why this case?