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generateEmptyCoverage.js
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generateEmptyCoverage.js
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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.
*
* @flow
*/
import type {GlobalConfig, ProjectConfig, Path} from 'types/Config';
import {readInitialCoverage} from 'istanbul-lib-instrument';
import {classes} from 'istanbul-lib-coverage';
import Runtime from 'jest-runtime';
export type CoverageWorkerResult = {|
coverage: any,
sourceMapPath: ?string,
|};
const {FileCoverage} = classes;
export default function(
source: string,
filename: Path,
globalConfig: GlobalConfig,
config: ProjectConfig,
): ?CoverageWorkerResult {
const coverageOptions = {
collectCoverage: globalConfig.collectCoverage,
collectCoverageFrom: globalConfig.collectCoverageFrom,
collectCoverageOnlyFrom: globalConfig.collectCoverageOnlyFrom,
};
if (Runtime.shouldInstrument(filename, coverageOptions, config)) {
// Transform file with instrumentation to make sure initial coverage data is well mapped to original code.
const {code, mapCoverage, sourceMapPath} = new Runtime.ScriptTransformer(
config,
).transformSource(filename, source, true);
const extracted = readInitialCoverage(code);
return {
coverage: new FileCoverage(extracted.coverageData),
sourceMapPath: mapCoverage ? sourceMapPath : null,
};
} else {
return null;
}
}