@jest/create-cache-key-function v29.7.0
jest-create-cache-key-function
This module creates a function which is used for generating cache keys used by code transformers in Jest.
Install
$ npm install --save-dev @jest/create-cache-key-function
API
createCacheKey(files?: Array<string>, values?: Array<String>, length?: number): GetCacheKeyFunction
Returns a function that can be used to generate cache keys based on source code of provided files and provided values.
Parameters
files
: Optional Array of absolute paths to files whose code should be accounted for when generating cache keyvalues
: Optional Array of string values that should be accounted for when generating cache keylength
: Optional Length of the resulting key. The default is32
, or16
on Windows.
Note:
The source code for your test is already taken into account when generating the cache key. The files
array should be used to provide files that are not directly related to your code such as external configuration files.
Usage
Here is some sample usage code while creating a new transformer for Jest
const createCacheKeyFunction =
require('@jest/create-cache-key-function').default;
const filesToAccountFor = [
__filename,
require.resolve('some-package-name/package.json'),
];
const valuesToAccountFor = [process.env.SOME_LOCAL_ENV, 'Some_Other_Value'];
module.exports = {
process(src, filename, config, options) {},
getCacheKey: createCacheKeyFunction(filesToAccountFor, valuesToAccountFor),
};
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