fix(model.d): accept [Op.is] in where (broken in TypeScript 4.4) (#13499)

* fix(model.d): accept `[Op.is]` in where

* fix(model.d): test `[Op.is]` in where

Co-authored-by: Sascha Depold <sdepold@users.noreply.github.com>
Co-authored-by: Constantin Metz <58604248+Keimeno@users.noreply.github.com>

types/lib/model.d.ts

@@ -161,6 +161,9 @@ export interface WhereOperators {
   /** Example: `[Op.not]: true,` becomes `IS NOT TRUE` */
   [Op.not]?: null | boolean | string | number | Literal | WhereOperators;
 
+  /** Example: `[Op.is]: null,` becomes `IS NULL` */
+  [Op.is]?: null;
+
   /** Example: `[Op.between]: [6, 10],` becomes `BETWEEN 6 AND 10` */
   [Op.between]?: Rangable;
 

types/test/where.ts

@@ -50,6 +50,7 @@ expectTypeOf({
   [Op.lte]: 10, // <= 10
   [Op.ne]: 20, // != 20
   [Op.not]: true, // IS NOT TRUE
+  [Op.is]: null, // IS NULL
   [Op.between]: [6, 10], // BETWEEN 6 AND 10
   [Op.notBetween]: [11, 15], // NOT BETWEEN 11 AND 15
   [Op.in]: [1, 2], // IN [1, 2]