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# jest-validate
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Generic configuration validation tool that helps you with warnings, errors and deprecation messages as well as showing users examples of correct configuration.
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```bash
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npm install --save jest-validate
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```
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## Usage
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```js
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import {validate} from 'jest-validate';
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validate(config, validationOptions); // => {hasDeprecationWarnings: boolean, isValid: boolean}
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```
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Where `ValidationOptions` are:
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```ts
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type ValidationOptions = {
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comment?: string;
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condition?: (option: unknown, validOption: unknown) => boolean;
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deprecate?: (
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config: Record<string, unknown>,
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option: string,
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deprecatedOptions: DeprecatedOptions,
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options: ValidationOptions,
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) => boolean;
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deprecatedConfig?: DeprecatedOptions;
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error?: (
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option: string,
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received: unknown,
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defaultValue: unknown,
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options: ValidationOptions,
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path?: Array<string>,
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) => void;
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exampleConfig: Record<string, unknown>;
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recursive?: boolean;
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recursiveBlacklist?: Array<string>;
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recursiveDenylist?: Array<string>;
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title?: Title;
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unknown?: (
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config: Record<string, unknown>,
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exampleConfig: Record<string, unknown>,
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option: string,
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options: ValidationOptions,
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path?: Array<string>,
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) => void;
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};
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type Title = {
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deprecation?: string;
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error?: string;
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warning?: string;
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};
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```
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`exampleConfig` is the only option required.
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## API
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By default `jest-validate` will print generic warning and error messages. You can however customize this behavior by providing `options: ValidationOptions` object as a second argument:
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Almost anything can be overwritten to suite your needs.
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### Options
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- `recursiveDenylist` – optional array of string keyPaths that should be excluded from deep (recursive) validation.
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- `comment` – optional string to be rendered below error/warning message.
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- `condition` – an optional function with validation condition.
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- `deprecate`, `error`, `unknown` – optional functions responsible for displaying warning and error messages.
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- `deprecatedConfig` – optional object with deprecated config keys.
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- `exampleConfig` – the only **required** option with configuration against which you'd like to test.
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- `recursive` - optional boolean determining whether recursively compare `exampleConfig` to `config` (default: `true`).
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- `title` – optional object of titles for errors and messages.
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You will find examples of `condition`, `deprecate`, `error`, `unknown`, and `deprecatedConfig` inside source of this repository, named respectively.
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## exampleConfig syntax
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`exampleConfig` should be an object with key/value pairs that contain an example of a valid value for each key. A configuration value is considered valid when:
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- it matches the JavaScript type of the example value, e.g. `string`, `number`, `array`, `boolean`, `function`, or `object`
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- it is `null` or `undefined`
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- it matches the Javascript type of any of arguments passed to `MultipleValidOptions(...)`
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The last condition is a special syntax that allows validating where more than one type is permissible; see example below. It's acceptable to have multiple values of the same type in the example, so you can also use this syntax to provide more than one example. When a validation failure occurs, the error message will show all other values in the array as examples.
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## Examples
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Minimal example:
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```js
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validate(config, {exampleConfig});
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```
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Example with slight modifications:
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```js
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validate(config, {
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comment: ' Documentation: http://custom-docs.com',
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deprecatedConfig,
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exampleConfig,
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title: {
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deprecation: 'Custom Deprecation',
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// leaving 'error' and 'warning' as default
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},
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});
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```
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This will output:
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#### Warning:
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```bash
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● Validation Warning:
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Unknown option transformx with value "<rootDir>/node_modules/babel-jest" was found.
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This is either a typing error or a user mistake. Fixing it will remove this message.
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Documentation: http://custom-docs.com
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```
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#### Error:
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```bash
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● Validation Error:
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Option transform must be of type:
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object
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but instead received:
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string
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Example:
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{
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"transform": {
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"\\.js$": "<rootDir>/preprocessor.js"
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}
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}
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Documentation: http://custom-docs.com
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```
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## Example validating multiple types
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```js
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import {multipleValidOptions} from 'jest-validate';
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validate(config, {
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// `bar` will accept either a string or a number
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bar: multipleValidOptions('string is ok', 2),
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});
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```
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#### Error:
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```bash
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● Validation Error:
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Option foo must be of type:
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string or number
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but instead received:
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array
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Example:
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{
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"bar": "string is ok"
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}
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or
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{
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"bar": 2
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}
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Documentation: http://custom-docs.com
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```
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#### Deprecation
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Based on `deprecatedConfig` object with proper deprecation messages. Note custom title:
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```bash
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Custom Deprecation:
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Option scriptPreprocessor was replaced by transform, which support multiple preprocessors.
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Jest now treats your current configuration as:
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{
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"transform": {".*": "xxx"}
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}
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Please update your configuration.
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Documentation: http://custom-docs.com
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```
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