feat(object): add validator for object

Author: TomokiMiyauci

validators/object.ts

@@ -0,0 +1,32 @@
+// Copyright 2023-latest Tomoki Miyauchi. All rights reserved. MIT license.
+// This module is browser compatible.
+
+import { map } from "../iter_utils.ts";
+import { fromPath, partialR } from "../utils.ts";
+import {
+  Assert,
+  AssertiveValidator,
+  Validation,
+  ValidationError,
+} from "../types.ts";
+
+export class ObjectValidator<
+  const In extends Record<string, unknown>,
+  const In_ extends In = In,
+> implements AssertiveValidator<In, In_> {
+  declare [Assert.symbol]: In_;
+  constructor(
+    public validators:
+      & { [k in keyof In]: Validation<In[k], In_[k]> }
+      & { [k in keyof In_]: Validation<In_[k]> },
+  ) {}
+
+  *validate(input: In): Iterable<ValidationError> {
+    for (const [key, validator] of Object.entries(this.validators)) {
+      const value = input[key];
+      const iterable = validator.validate(value as never);
+
+      yield* map(iterable, partialR(fromPath, key));
+    }
+  }
+}