dom-testing-library/src/get-user-code-frame.js at main · testing-library/dom-testing-library · GitHub

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// We try to load node dependencies

let picocolors = null

let readFileSync = null

let codeFrameColumns = null

try {

const nodeRequire = module && module.require

readFileSync = nodeRequire.call(module, 'fs').readFileSync

codeFrameColumns = nodeRequire.call(

module,

'@babel/code-frame',

).codeFrameColumns

picocolors = nodeRequire.call(module, 'picocolors')

} catch {

// We're in a browser environment

}

// frame has the form "at myMethod (location/to/my/file.js:10:2)"

function getCodeFrame(frame) {

const locationStart = frame.indexOf('(') + 1

const locationEnd = frame.indexOf(')')

const frameLocation = frame.slice(locationStart, locationEnd)

const frameLocationElements = frameLocation.split(':')

const [filename, line, column] = [

frameLocationElements[0],

parseInt(frameLocationElements[1], 10),

parseInt(frameLocationElements[2], 10),

]

let rawFileContents = ''

try {

rawFileContents = readFileSync(filename, 'utf-8')

} catch {

return ''

}

const codeFrame = codeFrameColumns(

rawFileContents,

{

start: {line, column},

{

highlightCode: true,

linesBelow: 0,

)

return `${picocolors.dim(frameLocation)}\n${codeFrame}\n`

}

function getUserCodeFrame() {

// If we couldn't load dependencies, we can't generate the user trace

/* istanbul ignore next */

if (!readFileSync || !codeFrameColumns) {

return ''

}

const err = new Error()

const firstClientCodeFrame = err.stack

.split('\n')

.slice(1) // Remove first line which has the form "Error: TypeError"

.find(frame => !frame.includes('node_modules/')) // Ignore frames from 3rd party libraries

return getCodeFrame(firstClientCodeFrame)

}

export {getUserCodeFrame}

dom-testing-library/src/get-user-code-frame.js at main · testing-library/dom-testing-library · GitHub

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