Initial

resources/app/client/apps/forms/combatant-config.js

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+/**
+ * The Application responsible for configuring a single Combatant document within a parent Combat.
+ * @extends {DocumentSheet}
+ */
+class CombatantConfig extends DocumentSheet {
+
+  /** @inheritdoc */
+  static get defaultOptions() {
+    return foundry.utils.mergeObject(super.defaultOptions, {
+      id: "combatant-config",
+      title: game.i18n.localize("COMBAT.CombatantConfig"),
+      classes: ["sheet", "combat-sheet"],
+      template: "templates/sheets/combatant-config.html",
+      width: 420
+    });
+  }
+
+  /* -------------------------------------------- */
+
+  /** @override */
+  get title() {
+    return game.i18n.localize(this.object.id ? "COMBAT.CombatantUpdate" : "COMBAT.CombatantCreate");
+  }
+
+  /* -------------------------------------------- */
+
+  /** @override */
+  async _updateObject(event, formData) {
+    if ( this.object.id ) return this.object.update(formData);
+    else {
+      const cls = getDocumentClass("Combatant");
+      return cls.create(formData, {parent: game.combat});
+    }
+  }
+}