forked from jestjs/jest
/
generate_config_file.ts
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/
generate_config_file.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import {Config} from '@jest/types';
import {defaults, descriptions} from 'jest-config';
const stringifyOption = (
option: keyof Config.InitialOptions,
map: Partial<Config.InitialOptions>,
linePrefix: string = '',
): string => {
const optionDescription = ` // ${descriptions[option]}`;
const stringifiedObject = `${option}: ${JSON.stringify(
map[option],
null,
2,
)}`;
return (
optionDescription +
'\n' +
stringifiedObject
.split('\n')
.map(line => ' ' + linePrefix + line)
.join('\n') +
',\n'
);
};
const generateConfigFile = (results: {[key: string]: unknown}): string => {
const {coverage, clearMocks, environment} = results;
const overrides: Object = {};
if (coverage) {
Object.assign(overrides, {
coverageDirectory: 'coverage',
});
}
if (environment === 'node') {
Object.assign(overrides, {
testEnvironment: 'node',
});
}
if (clearMocks) {
Object.assign(overrides, {
clearMocks: true,
});
}
const overrideKeys = Object.keys(overrides) as Array<
keyof Config.InitialOptions
>;
const properties: Array<string> = [];
for (const option in descriptions) {
const opt = option as keyof typeof descriptions;
if (overrideKeys.includes(opt)) {
properties.push(stringifyOption(opt, overrides));
} else {
properties.push(
stringifyOption(opt, defaults as Config.InitialOptions, '// '),
);
}
}
return (
'// For a detailed explanation regarding each configuration property, visit:\n' +
'// https://jestjs.io/docs/en/configuration.html\n\n' +
'module.exports = {\n' +
properties.join('\n') +
'};\n'
);
};
export default generateConfigFile;