How to use @lwc/jest-preset - 1 common examples
To help you get started, we’ve selected a few @lwc/jest-preset examples, based on popular ways it is used in public projects.
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salesforce / sfdx-lwc-jest / src / config.js View on Github 
PROJECT_ROOT,
getModulePaths,
} = require('./utils/project.js');
function getCoveragePaths() {
const modulePaths = getModulePaths();
return modulePaths.map(p => {
// convert back to forward slashes here on Windows for Jest to be happy
return p.replace(/\\/g, '/') + '**/*.js';
});
}
const jestConfig = {
rootDir: PROJECT_ROOT,
moduleFileExtensions: ['js', 'html'],
testEnvironment: jestPreset.testEnvironment || 'jsdom',
transform: {
'^.+\\.(js|html|css)$': require.resolve('@lwc/jest-transformer')
},
transformIgnorePatterns: [
"/node_modules/(?!(.*@salesforce/sfdx-lwc-jest/src/lightning-stubs)/)"
],
resolver: path.resolve(__dirname, './resolver.js'),
testPathIgnorePatterns: [
'/node_modules/',
'/test/specs/',
],
collectCoverageFrom: getCoveragePaths(),
snapshotSerializers: [
require.resolve('@lwc/jest-serializer')
],
};@lwc/jest-preset
Jest preset configuration and stubs to help test LWC
