forked from jestjs/jest
/
generateEmptyCoverage.ts
52 lines (47 loc) · 1.77 KB
/
generateEmptyCoverage.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.
*/
// TODO: Remove this
/// <reference path="../istanbul-lib-coverage.d.ts" />
import {Config} from '@jest/types';
import {readInitialCoverage} from 'istanbul-lib-instrument';
import {classes} from 'istanbul-lib-coverage';
import {shouldInstrument, ScriptTransformer} from '@jest/transform';
const FileCoverage = classes.FileCoverage;
export type CoverageWorkerResult = {
coverage: any;
sourceMapPath?: string | null;
};
export default function(
source: string,
filename: Config.Path,
globalConfig: Config.GlobalConfig,
config: Config.ProjectConfig,
changedFiles?: Set<Config.Path>,
): CoverageWorkerResult | null {
const coverageOptions = {
changedFiles,
collectCoverage: globalConfig.collectCoverage,
collectCoverageFrom: globalConfig.collectCoverageFrom,
collectCoverageOnlyFrom: globalConfig.collectCoverageOnlyFrom,
};
let coverageWorkerResult: CoverageWorkerResult | null = null;
if (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 ScriptTransformer(
config,
).transformSource(filename, source, true);
const extracted = readInitialCoverage(code);
// Check extracted initial coverage is not null, this can happen when using /* istanbul ignore file */
if (extracted) {
coverageWorkerResult = {
coverage: new FileCoverage(extracted.coverageData),
sourceMapPath: mapCoverage ? sourceMapPath : null,
};
}
}
return coverageWorkerResult;
}