ts-jest
Version:
A Jest transformer with source map support that lets you use Jest to test projects written in TypeScript
33 lines (32 loc) • 1.38 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.SOURCE_MAPPING_PREFIX = void 0;
exports.updateOutput = updateOutput;
const utils_1 = require("../../utils");
/**
* Rely on TypeScript compiled output generation which contains this prefix to point to sourcemap location.
*/
exports.SOURCE_MAPPING_PREFIX = 'sourceMappingURL=';
/**
* Update the output remapping the source map.
*/
function updateOutput(outputText, normalizedFileName, sourceMap) {
if (sourceMap) {
const base64Map = Buffer.from(updateSourceMap(sourceMap, normalizedFileName), 'utf8').toString('base64');
const sourceMapContent = `data:application/json;charset=utf-8;base64,${base64Map}`;
// sourceMappingURL= prefix is always at the end of compiledOutput, using lastIndexOf should be the safest way to substring
return (outputText.slice(0, outputText.lastIndexOf(exports.SOURCE_MAPPING_PREFIX) + exports.SOURCE_MAPPING_PREFIX.length) +
sourceMapContent);
}
return outputText;
}
/**
* Update the source map contents for improved output.
*/
const updateSourceMap = (sourceMapText, normalizedFileName) => {
const sourceMap = JSON.parse(sourceMapText);
sourceMap.file = normalizedFileName;
sourceMap.sources = [normalizedFileName];
delete sourceMap.sourceRoot;
return (0, utils_1.stringify)(sourceMap);
};