feat(negative_number): add validator for negative number

Author: TomokiMiyauci

_tools/meta.ts

@@ -72,6 +72,11 @@ export const makeOptions = (version: string): BuildOptions => ({
       version: "1.3.1",
       subPath: "number/is_positive_number.js",
     },
+    "https://deno.land/x/isx@1.3.1/number/is_negative_number.ts": {
+      name: "@miyauci/isx",
+      version: "1.3.1",
+      subPath: "number/is_negative_number.js",
+    },
     "https://deno.land/x/isx@1.3.1/date/is_valid_date.ts": {
       name: "@miyauci/isx",
       version: "1.3.1",

combinator.ts

@@ -12,6 +12,7 @@ import { OptionalValidator } from "./validators/object/optional.ts";
 import { NullishValidator } from "./validators/nullish.ts";
 import { IntegerValidator } from "./validators/number/integer.ts";
 import { PositiveNumberValidator } from "./validators/number/positive_number.ts";
+import { NegativeNumberValidator } from "./validators/number/negative_number.ts";
 import { PatternValidator } from "./validators/string/pattern.ts";
 import { CountValidator } from "./validators/iterable/count.ts";
 import { EmptyValidator } from "./validators/iterable/empty.ts";
@@ -127,6 +128,9 @@ export const unique = /* @__PURE__ */ new UniqueValidator().expect(({ item }) =>
 
 // number
 export const int = /* @__PURE__ */ new IntegerValidator().expect(shouldBeBut);
+export const negative = /* @__PURE__ */ new NegativeNumberValidator().expect(
+  shouldBeBut,
+);
 export const positive = /* @__PURE__ */ new PositiveNumberValidator()
   .expect(shouldBeBut);
 

deps.ts

@@ -7,6 +7,7 @@ export { isSingle } from "https://deno.land/x/isx@1.3.1/iterable/is_single.ts";
 export { isNonNullable } from "https://deno.land/x/isx@1.3.1/is_non_nullable.ts";
 export { isString } from "https://deno.land/x/isx@1.3.1/is_string.ts";
 export { isPositiveNumber } from "https://deno.land/x/isx@1.3.1/number/is_positive_number.ts";
+export { isNegativeNumber } from "https://deno.land/x/isx@1.3.1/number/is_negative_number.ts";
 export { isValidDate } from "https://deno.land/x/isx@1.3.1/date/is_valid_date.ts";
 export { filterKeys } from "https://deno.land/std@0.187.0/collections/filter_keys.ts";
 export { default as escapeStringRegex } from "https://esm.sh/escape-string-regexp@5.0.0?pin=v122";

validators/number/negative_number.ts

@@ -0,0 +1,13 @@
+// Copyright 2023-latest Tomoki Miyauchi. All rights reserved. MIT license.
+// This module is browser compatible.
+
+import { ScalarValidator } from "../../utils.ts";
+import { isNegativeNumber, ToPredicate } from "../../deps.ts";
+
+export class NegativeNumberValidator extends ScalarValidator<number> {
+  is = isNegativeNumber as ToPredicate<typeof isNegativeNumber>;
+
+  override toString() {
+    return "negative number";
+  }
+}