Installing dependencies.

node_modules/eslint-plugin-jest/docs/rules/prefer-mock-promise-shorthand.md

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+# Prefer mock resolved/rejected shorthands for promises (`prefer-mock-promise-shorthand`)
+
+When working with mocks of functions that return promises, Jest provides some
+API sugar functions to reduce the amount of boilerplate you have to write.
+
+These methods should be preferred when possible.
+
+## Rule Details
+
+The following patterns are warnings:
+
+```js
+jest.fn().mockImplementation(() => Promise.resolve(123));
+jest
+  .spyOn(fs.promises, 'readFile')
+  .mockReturnValue(Promise.reject(new Error('oh noes!')));
+
+myFunction
+  .mockReturnValueOnce(Promise.resolve(42))
+  .mockImplementationOnce(() => Promise.resolve(42))
+  .mockReturnValue(Promise.reject(new Error('too many calls!')));
+```
+
+The following patterns are not warnings:
+
+```js
+jest.fn().mockResolvedValue(123);
+jest.spyOn(fs.promises, 'readFile').mockRejectedValue(new Error('oh noes!'));
+
+myFunction
+  .mockResolvedValueOnce(42)
+  .mockResolvedValueOnce(42)
+  .mockRejectedValue(new Error('too many calls!'));
+```