Table of contents

Runtime specification

On this page

By default, all our runners have their timezone set to UTC, regardless of their location.

Resource limitations

Each Browser and Multistep check can use up to 2.9 GiB of memory and 2 CPU cores. This limit applies to all processes spawned by the check, including the browser, the test framework, and the test code itself. The limit is enforced by the runner and is not configurable.

When the memory limit is exceeded, the check will automatically fail with a relevant error message, for example: Your check has reached the maximum memory usage of 2.9 GiB.

Built-in Node.js modules

assert
buffer
crypto
dns
fs
path
querystring
readline
stream
string_decoder
timers
tls
url
util
zlib

See the built-in module documentation on the official Node.js site:

NPM packages

These are the currently available runtimes and the included external NPM dependencies.

The packages below are included for setup and teardown scripts as well, with the exclusion of Puppeteer, Playwright and Mocha.

We are planning to deprecate mocha in the future. Please use @playwright/test as a test framework instead.

`2024.02`

Main updates are Playwright 1.42.1. Node version is 18. New dependencies: @opentelemetry/exporter-metrics-otlp-grpc, @opentelemetry/sdk-metrics, chai-json-schema, pdf2json, protobufjs, long and the nice-grpc family.

@axe-core/playwright 4.8.5
@azure/identity 4.3.0
@azure/keyvault-secrets 4.8.0
@checkly/playwright-helpers 1.0.2
@dvag/playwright-utils latest
@faker-js/faker 8.4.1
@google-cloud/local-auth 3.0.1
@opentelemetry/api 1.7.0
@opentelemetry/exporter-metrics-otlp-grpc 0.48.0
@opentelemetry/sdk-metrics 1.22.0
@opentelemetry/sdk-trace-base 1.22.0
@playwright/test 1.42.1
@t3-oss/env-nextjs 0.9.2
@xmldom/xmldom 0.8.10
allure-playwright latest
aws4 1.12.0
axios 0.28.0
btoa 1.2.1
chai 4.4.1
chai-json-schema 1.5.1
chai-string 1.5.0
crypto-js 4.2.0
date-fns 3.3.1
date-fns-tz 3.1.3
dotenv 16.4.5
ethers 6.11.1
expect 29.7.0
form-data 4.0.0
gmail-api-parse-message-ts 2.2.32
google-auth-library 9.6.3
googleapis 133.0.0
graphql 16.9.0
graphql-tag 2.12.6
jose 5.2.2
jsdom 24.0.0
jsonwebtoken 9.0.2
lodash 4.17.21
long 5.2.3
moment 2.30.1
nice-grpc 2.1.8
nice-grpc-client-middleware-deadline 2.0.11
nice-grpc-client-middleware-devtools 1.0.3
nice-grpc-client-middleware-retry 3.1.7
nice-grpc-common 2.0.2
nice-grpc-error-details 0.2.5
nice-grpc-opentelemetry 0.1.14
nice-grpc-prometheus 0.2.3
nice-grpc-server-health 2.0.10
nice-grpc-server-middleware-terminator 2.0.10
nice-grpc-server-reflection 2.0.10
nice-grpc-web 3.3.3
otpauth 9.2.2
pdf2json 3.0.5
playwright 1.42.1
prisma 5.10.2
protobufjs 7.2.6
protobufjs/light 7.2.6
protobufjs/minimal 7.2.6
tedious 18.2.0
twilio 4.23.0
uuid 9.0.1
ws 8.16.0
xml-crypto 6.0.0
xml-encryption 3.0.2
zod 3.22.4

`2023.09`

Main updates are Playwright 1.38.1 and the addition of ethers 6.7.1, prisma 5.1.1, zod 3.22.2, @t3-oss/env-nextjs 0.6.1 and @xmldom/xmldom 0.8.10. Node version is 18.

@checkly/playwright-helpers 1.0.2
@faker-js/faker 8.0.2
@google-cloud/local-auth 3.0.0
@opentelemetry/api 1.4.1
@opentelemetry/sdk-trace-base 1.15.2
@playwright/test 1.38.1
@t3-oss/env-nextjs 0.6.1
@xmldom/xmldom 0.8.10
aws4 1.12.0
axios 0.27.2
btoa 1.2.1
chai 4.3.7
chai-string 1.5.0
crypto-js 4.1.1
date-fns 2.30.0
date-fns-tz 2.0.0
dotenv 16.3.1
ethers 6.7.1
expect 29.6.2
form-data 4.0.0
gmail-api-parse-message-ts 2.2.32
google-auth-library 9.0.0
googleapis 126.0.0
jose 4.14.4
jsdom 22.1.0
jsonwebtoken 9.0.1
lodash 4.17.21
moment 2.29.4
node 18.x
otpauth 9.1.4
playwright 1.38.1
prisma 5.1.1
twilio 4.15.0
uuid 9.0.0
ws 8.13.0
xml-crypto 4.1.0
xml-encryption 3.0.2
zod 3.22.2

`2023.02`

Main updates are Playwright 1.32.1, faker 7.6.0 and the addition of date-fns 2.29.3 and ws 8.13.0. We are also dropping support for Mocha.

@faker-js/faker 7.6.0
@google-cloud/local-auth 2.1.1
@opentelemetry/api 1.0.4
@opentelemetry/sdk-trace-base 1.0.1
@playwright/test 1.32.3
aws4 1.11.0
axios 0.27.2
btoa 1.2.1
chai 4.3.7
chai-string 1.5.0
crypto-js 4.1.1
date-fns 2.29.3
date-fns-tz 2.0.0
expect 29.3.1
form-data 4.0.0
gmail-api-parse-message-ts 2.2.32
google-auth-library 8.8.0
googleapis 118.0.0
jose 4.14.1
jsdom 21.1.2
jsonwebtoken 9.0.0
lodash 4.17.21
moment 2.29.2
node 16.x
otpauth 9.0.2
playwright 1.32.3
twilio 4.11.1
typescript 4.8.4
uuid 9.0.0
ws 8.13.0
xml-crypto 4.0.1
xml-encryption 3.0.2

`2022.10`

Main updates are Playwright 1.28.0, Node.js 16.x and Typescript support. We are also dropping support for Puppeteer

@faker-js/faker 5.5.3
@opentelemetry/api 1.0.4
@opentelemetry/sdk-trace-base 1.0.1
@playwright/test 1.28.0
aws4 1.11.0
axios 0.27.2
btoa 1.2.1
chai 4.3.7
chai-string 1.5.0
crypto-js 4.1.1
expect 29.3.1
form-data 4.0.0
jsonwebtoken 8.5.1
lodash 4.17.21
mocha 10.1.0
moment 2.29.2
node 16.x
otpauth 9.0.2
playwright 1.28.0
typescript 4.8.4
uuid 9.0.0

`2022.02`

  (DEPRECATED)


This runtime will be available until 2023-12-13. Please update your checks' runtimes and account settings
to avoid failures due to automatic change to the next supported runtime.

Main updates are Playwright 1.20.2 and Puppeteer 13.7.0 and Node.js 14.x

@faker-js/faker 5.5.3
@opentelemetry/api 1.0.4
@opentelemetry/sdk-trace-base 1.0.1
@playwright/test 1.20.2
aws4 1.11.0
axios 0.26.0
btoa 1.2.1
chai 4.3.4
chai-string 1.5.0
crypto-js 4.1.1
expect 27.5.1
form-data 4.0.0
jsonwebtoken 8.5.1
lodash 4.17.21
mocha 9.2.1
moment 2.29.2
node 14.x
playwright 1.20.2
puppeteer 13.7.0
request 2.88.2
request-promise 4.2.6
totp-generator 0.0.13
uuid 8.3.2

Last updated on August 15, 2024. You can contribute to this documentation by editing this page on Github