Installing dependencies.

node_modules/eslint-plugin-jest/docs/rules/prefer-strict-equal.md

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+# Suggest using `toStrictEqual()` (`prefer-strict-equal`)
+
+`toStrictEqual` not only checks that two objects contain the same data but also
+that they have the same structure. It is common to expect objects to not only
+have identical values but also to have identical keys. A stricter equality will
+catch cases where two objects do not have identical keys.
+
+## Rule details
+
+This rule triggers a warning if `toEqual()` is used to assert equality.
+
+### Default configuration
+
+The following pattern is considered warning:
+
+```js
+expect({ a: 'a', b: undefined }).toEqual({ a: 'a' }); // true
+```
+
+The following pattern is not warning:
+
+```js
+expect({ a: 'a', b: undefined }).toStrictEqual({ a: 'a' }); // false
+```