more validators

validators/empty.ts

@@ -0,0 +1,70 @@
+import {
+  Validator,
+  Args,
+  isString,
+  isArray,
+  isNumber,
+  isSymbol,
+  isBoolean,
+} from "../mod.ts";
+
+export const isRequired: Validator = {
+  type: "isRequired",
+  check: (value: any) => {
+    if (value === null || value === undefined) {
+      return {};
+    }
+  },
+  message: (value: any, args?: Args) => {
+    return `This value is required.`;
+  },
+};
+
+export const isDefined: Validator = {
+  type: "isDefined",
+  check: (value: any) => {
+    if (value === undefined) {
+      return {};
+    }
+  },
+  message: (value: any, args?: Args) => {
+    return `This value has to be defined.`;
+  },
+};
+
+export const isNotEmpty: Validator = {
+  type: "isNotEmpty",
+  check: async (value: any) => {
+    if (value === null || value === undefined) {
+      return {};
+    }
+    if ((await isString.check(value)) === undefined) {
+      if (/^\s*$/.test(value)) {
+        return {};
+      }
+      return;
+    }
+    if ((await isNumber.check(value)) === undefined || Number.isNaN(value)) {
+      return;
+    }
+    if (await isSymbol.check(value) === undefined) {
+      return;
+    }
+    if (await isBoolean.check(value) === undefined) {
+      return;
+    }
+    if ((await isArray.check(value)) === undefined) {
+      if (value.length > 0) {
+        return;
+      }
+      return {};
+    }
+    for (const key in value) {
+      return;
+    }
+    return {};
+  },
+  message: (value: any, args?: Args) => {
+    return `This value has to be non-empty.`;
+  },
+};