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Sean Edmunds
2021-12-13 17:00:40 -06:00
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# Disallow string interpolation inside snapshots (`no-interpolation-in-snapshots`)
Prevents the use of string interpolations in snapshots.
## Rule Details
Interpolation prevents snapshots from being updated. Instead, properties should
be overloaded with a matcher by using
[property matchers](https://jestjs.io/docs/en/snapshot-testing#property-matchers).
Examples of **incorrect** code for this rule:
```js
expect(something).toMatchInlineSnapshot(
`Object {
property: ${interpolated}
}`,
);
expect(something).toMatchInlineSnapshot(
{ other: expect.any(Number) },
`Object {
other: Any<Number>,
property: ${interpolated}
}`,
);
expect(errorThrowingFunction).toThrowErrorMatchingInlineSnapshot(
`${interpolated}`,
);
```
Examples of **correct** code for this rule:
```js
expect(something).toMatchInlineSnapshot();
expect(something).toMatchInlineSnapshot(
`Object {
property: 1
}`,
);
expect(something).toMatchInlineSnapshot(
{ property: expect.any(Date) },
`Object {
property: Any<Date>
}`,
);
expect(errorThrowingFunction).toThrowErrorMatchingInlineSnapshot();
expect(errorThrowingFunction).toThrowErrorMatchingInlineSnapshot(
`Error Message`,
);
```
## When Not To Use It
Don't use this rule on non-jest test files.