Make Keymap class

src/shared/settings/Keymaps.ts

@@ -0,0 +1,37 @@
+import * as operations from '../operations';
+
+export type KeymapsJSON = { [key: string]: operations.Operation };
+
+export default class Keymaps {
+  constructor(
+    private readonly data: KeymapsJSON,
+  ) {
+  }
+
+  static fromJSON(json: any): Keymaps {
+    if (typeof json !== 'object' || json === null) {
+      throw new TypeError('invalid keymaps type: ' + JSON.stringify(json));
+    }
+
+    let data: KeymapsJSON = {};
+    for (let key of Object.keys(json)) {
+      data[key] = operations.valueOf(json[key]);
+    }
+    return new Keymaps(data);
+  }
+
+  combine(other: Keymaps): Keymaps {
+    return new Keymaps({
+      ...this.data,
+      ...other.data,
+    });
+  }
+
+  toJSON(): KeymapsJSON {
+    return this.data;
+  }
+
+  entries(): [string, operations.Operation][] {
+    return Object.entries(this.data);
+  }
+}