joi: add missing 'alt' method

types/joi/index.d.ts

@@ -551,7 +551,7 @@ export interface StringSchema extends AnySchema {
      * Requires the string value to be a valid GUID.
      */
     guid(options?: GuidOptions): this;
-    
+
     /**
      * Alias for `guid` -- Requires the string value to be a valid GUID
      */
@@ -962,10 +962,15 @@ export function string(): StringSchema;
 /**
  * Generates a type that will match one of the provided alternative schemas
  */
-export function alternatives(): AlternativesSchema;
 export function alternatives(types: SchemaLike[]): AlternativesSchema;
 export function alternatives(...types: SchemaLike[]): AlternativesSchema;
 
+/**
+ * Alias for `alternatives`
+ */
+export function alt(types: SchemaLike[]): AlternativesSchema;
+export function alt(...types: SchemaLike[]): AlternativesSchema;
+
 /**
  * Generates a placeholder schema for a schema that you would provide with the fn.
  * Supports the same methods of the any() type.
@@ -1031,3 +1036,4 @@ export function extend(extention: Extension): any;
  * Returns a plain object representing the schema's rules and properties
  */
 export function describe(schema: Schema): Description;
+

types/joi/joi-tests.ts

@@ -830,6 +830,13 @@ schema = Joi.alternatives().try(schema, schema);
 schema = Joi.alternatives(schemaArr);
 schema = Joi.alternatives(schema, anySchema, boolSchema);
 
+schema = Joi.alt();
+schema = Joi.alt().try(schemaArr);
+schema = Joi.alt().try(schema, schema);
+
+schema = Joi.alt(schemaArr);
+schema = Joi.alt(schema, anySchema, boolSchema);
+
 // --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
 
 schema = Joi.lazy(() => schema)