Replace is-ci with ci-info.isCI

[TheDevMinerTV]

is-ci is literally just an export wrapper for ci-info's isCI field, so we can just replace it everywhere we see it. That'd save 3KB and 2 HTTP roundtrips during installation.

[TheDevMinerTV]

Replaced it in Cypress: cypress-io/cypress#30465
Edit: got merged 🎉

[TheDevMinerTV]

Replaced it in html-minifier-terser: terser/html-minifier-terser#189

[Fuzzyma]

Here is a list of the top 20 packages using is-ci according to npm.js (which does not contain all dependents because it only allows the first 396 to be crawled):

Stats are downloads last-month.

#	Downloads	Traffic	Package
1	5.25M	11.28 GB	lerna
2	5.15M	11.08 GB	@lerna/create
3	2.08M	4.47 GB	update-notifier-cjs
4	2.07M	4.46 GB	yorkie
5	2.03M	4.37 GB	@lerna/command
6	1.43M	3.08 GB	builder-util
7	1.43M	3.07 GB	yurnalist
8	1.39M	2.99 GB	app-builder-lib
9	1.32M	2.85 GB	electron-builder
10	1.29M	2.77 GB	npm-check
11	908.76k	1.95 GB	testcafe
12	709.21k	1.52 GB	@aws-amplify/platform-core
13	612.93k	1.32 GB	@lerna/legacy-package-management
14	234.66k	504.53 MB	@aws-amplify/graphql-api-construct
15	224.21k	482.05 MB	@aws-amplify/data-construct
16	214.74k	461.70 MB	@aws-amplify/backend-cli
17	174.72k	375.64 MB	is-ci-cli
18	106.89k	229.81 MB	hint
19	102.37k	220.10 MB	@hint/connector-puppeteer
20	94.58k	203.35 MB	@prisma/sdk

[43081j]

update-notifier-cjs looks like it has these we can replace:

• chalk
• is-ci
• strip-ansi

Could be a good couple of PRs!

[talentlessguy]

PR to electron-builder: electron-userland/electron-builder#9117

[TheDevMinerTV]

FYI, lerna is still using it as well

dependants as of 12.05.2025 (I updated the metadata mirror again).

#	Downloads	Traffic	Version	Package
1	6.24M	14.63 GB	3.0.1	lerna
2	6.16M	14.45 GB	3.0.1	@lerna/create
3	2.86M	6.71 GB	^2.0.0	update-notifier-cjs
4	2.47M	5.80 GB	^2.0.0	@lerna/command
5	2.26M	5.29 GB	^3.0.0	builder-util
6	2.22M	5.21 GB	^3.0.0	app-builder-lib
7	2.19M	5.13 GB	^1.0.10	yorkie
8	2.09M	4.91 GB	^3.0.0	electron-builder
9	1.48M	3.46 GB	^2.0.0	npm-check
10	1.21M	2.84 GB	^2.0.0	yurnalist
11	984.89k	2.31 GB	^1.0.10	testcafe
12	651.82k	1.53 GB	^4.1.0	@aws-amplify/platform-core
13	627.55k	1.47 GB	3.0.1	@lerna/legacy-package-management
14	307.65k	721.75 MB	^3.0.1	@aws-amplify/graphql-api-construct
15	282.88k	663.64 MB	^4.1.0	@aws-amplify/backend-cli
16	257.06k	603.07 MB	^3.0.1	@aws-amplify/data-construct
17	250.42k	587.49 MB	^2.0.0	is-ci-cli
18	165.85k	389.09 MB	^1.0.10	@dependabot/yarn-lib
19	139.52k	327.31 MB	^4.1.0	@lerna-lite/core
20	103.12k	241.91 MB	3.0.1	@prisma/sdk
21	93.76k	219.96 MB	2.0.0	snap-shot-core
22	91.10k	213.72 MB	^3.0.1	hint
23	83.31k	195.44 MB	^2.0.0	gatsby-plugin-s3
24	79.56k	186.64 MB	^3.0.1	@hint/connector-puppeteer
25	58.29k	136.76 MB	^2.0.0	ovsx
26	41.70k	97.82 MB	^3.0.1	@milahu/patch-package
27	40.77k	95.64 MB	^2.0.0	@pika/pack
28	32.04k	75.17 MB	^3.0.0	@netlify/eslint-config-node
29	31.29k	73.40 MB	^1.0.10	amex-jest-preset
30	30.89k	72.47 MB	^2.0.0	japa

[absidue]

Looks like ci-info ships a 6KB, 350 line unmimified JSON file in the npm package. Mimifying that file would shave a few bytes off the install size, which is probably worth it with it having 52 million downloads per week. Unfortunately it doesn't look like they have a proper build step there yet. The existing "build" script sorts the JSON file and creates the index.d.ts file, but they check the results into the git repo, which you wouldn't want to do for the mimified JSON file.