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Generate empty coverage from instrumented result code. #1

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Generate empty coverage from instrumented result code. #1

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16 changes: 8 additions & 8 deletions packages/jest-cli/src/generateEmptyCoverage.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,9 +9,12 @@

import type {GlobalConfig, ProjectConfig, Path} from 'types/Config';

import {createInstrumenter} from 'istanbul-lib-instrument';
import {readInitialCoverage} from 'istanbul-lib-instrument';
import {classes} from 'istanbul-lib-coverage';
import Runtime from 'jest-runtime';

const FileCoverage = classes.FileCoverage;

export type CoverageWorkerResult = {|
coverage: any,
sourceMapPath: ?string,
Expand All @@ -29,16 +32,13 @@ export default function(
collectCoverageOnlyFrom: globalConfig.collectCoverageOnlyFrom,
};
if (Runtime.shouldInstrument(filename, coverageOptions, config)) {
// Transform file without instrumentation first, to make sure produced
// source code is ES6 (no flowtypes etc.) and can be instrumented
const transformResult = new Runtime.ScriptTransformer(
config,
).transformSource(filename, source, false);
const instrumenter = createInstrumenter();
instrumenter.instrumentSync(transformResult.code, filename);
).transformSource(filename, source, true);
const extracted = readInitialCoverage(transformResult.code);

return {
coverage: instrumenter.fileCoverage,
sourceMapPath: transformResult.sourceMapPath,
coverage: new FileCoverage(extracted.coverageData),
};
} else {
return null;
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