fix: inline CI detection

Author: sxzz

docs/advanced/ci.md

@@ -4,7 +4,7 @@ tsdown automatically detects CI environments and allows you to enable or disable
 
 ## CI Detection
 
-tsdown uses the [`is-in-ci`](https://www.npmjs.com/package/is-in-ci) package to detect CI environments. This covers all major CI providers including GitHub Actions, GitLab CI, Jenkins, CircleCI, Travis CI, and more.
+tsdown detects CI from the `CI` environment variable. CI mode is enabled when `process.env.CI` is set to a value other than `0` or `false` (case-insensitive).
 
 ## CI-Aware Options
 

docs/zh-CN/advanced/ci.md

@@ -4,7 +4,7 @@ tsdown 能够自动检测 CI 环境，并允许你根据构建是在本地还是
 
 ## CI 检测
 
-tsdown 使用 [`is-in-ci`](https://www.npmjs.com/package/is-in-ci) 包来检测 CI 环境，支持所有主流 CI 服务商，包括 GitHub Actions、GitLab CI、Jenkins、CircleCI、Travis CI 等。
+tsdown 通过 `CI` 环境变量检测 CI 环境。当 `process.env.CI` 被设置，且其值不是 `0` 或 `false`（不区分大小写）时，将启用 CI 模式。
 
 ## CI 感知选项
 

package.json

@@ -146,7 +146,6 @@
     "unconfig-core": "catalog:prod"
   },
   "inlinedDependencies": {
-    "is-in-ci": "2.0.0",
     "package-manager-detector": "1.6.0",
     "pkg-types": "2.3.1"
   },
@@ -171,7 +170,6 @@
     "bumpp": "catalog:dev",
     "dedent": "catalog:dev",
     "eslint": "catalog:dev",
-    "is-in-ci": "catalog:prod",
     "memfs": "catalog:dev",
     "package-manager-detector": "catalog:prod",
     "pkg-types": "catalog:dev",

pnpm-lock.yaml

@@ -74,7 +74,6 @@ catalogs:
     empathic: ^2.0.1
     hookable: ^6.1.1
     import-without-cache: ^0.4.0
-    is-in-ci: ^2.0.0
     lightningcss: ^1.32.0
     obug: ^2.1.1
     package-manager-detector: ^1.6.0

pnpm-workspace.yaml

@@ -4,7 +4,7 @@ Automatically detect CI environments and toggle features based on local vs CI bu
 
 ## Overview
 
-tsdown uses the [`is-in-ci`](https://www.npmjs.com/package/is-in-ci) package to detect CI environments. This covers GitHub Actions, GitLab CI, Jenkins, CircleCI, Travis CI, and more.
+tsdown detects CI from the `CI` environment variable. CI mode is enabled when `process.env.CI` is set to a value other than `0` or `false` (case-insensitive).
 
 ## CI-Aware Values
 

skills/tsdown/references/advanced-ci.md

@@ -4,9 +4,9 @@ import process from 'node:process'
 import { pathToFileURL } from 'node:url'
 import { underline } from 'ansis'
 import { depsStore, init, isSupported } from 'import-without-cache'
-import isInCi from 'is-in-ci'
 import { createDebug } from 'obug'
 import { createConfigCoreLoader } from 'unconfig-core'
+import { isInCI } from '../utils/ci.ts'
 import { fsStat } from '../utils/fs.ts'
 import { importWithError, toArray } from '../utils/general.ts'
 import { globalLogger } from '../utils/logger.ts'
@@ -136,7 +136,7 @@ export async function loadConfigFile(
 
     exported = await exported
     if (typeof exported === 'function') {
-      exported = await exported(inlineConfig, { ci: isInCi, rootConfig })
+      exported = await exported(inlineConfig, { ci: isInCI(), rootConfig })
     }
   }
 

src/config/file.ts

@@ -1,5 +1,5 @@
-import isInCi from 'is-in-ci'
-import { describe, expect, test } from 'vitest'
+import { afterEach, describe, expect, test, vi } from 'vitest'
+import { isInCI } from '../utils/ci.ts'
 import {
   resolveFeatureOption as _resolveFeatureOption,
   mergeConfig,
@@ -11,18 +11,54 @@ interface DefaultOption {
 }
 const resolveFeatureOption = _resolveFeatureOption<DefaultOption>
 
+afterEach(() => {
+  vi.unstubAllEnvs()
+})
+
+describe('isInCI', () => {
+  test('detects CI from process.env.CI', () => {
+    vi.stubEnv('CI', undefined)
+    expect(isInCI()).toBe(false)
+
+    vi.stubEnv('CI', '')
+    expect(isInCI()).toBe(true)
+
+    vi.stubEnv('CI', '0')
+    expect(isInCI()).toBe(false)
+
+    vi.stubEnv('CI', 'false')
+    expect(isInCI()).toBe(false)
+
+    vi.stubEnv('CI', 'FALSE')
+    expect(isInCI()).toBe(false)
+
+    vi.stubEnv('CI', '1')
+    expect(isInCI()).toBe(true)
+
+    vi.stubEnv('CI', 'true')
+    expect(isInCI()).toBe(true)
+  })
+})
+
 describe('resolveFeatureOption', () => {
   test('literal boolean', () => {
     expect(resolveFeatureOption(true, defaultOption)).toBe(defaultOption)
     expect(resolveFeatureOption(false, defaultOption)).toBe(false)
   })
 
-  test('literal CI', () => {
-    expect(resolveFeatureOption('ci-only', defaultOption)).toBe(
-      isInCi ? defaultOption : false,
-    )
+  test('literal CI in CI', () => {
+    vi.stubEnv('CI', 'true')
+
+    expect(resolveFeatureOption('ci-only', defaultOption)).toBe(defaultOption)
+    expect(resolveFeatureOption('local-only', defaultOption)).toBe(false)
+  })
+
+  test('literal CI locally', () => {
+    vi.stubEnv('CI', undefined)
+
+    expect(resolveFeatureOption('ci-only', defaultOption)).toBe(false)
     expect(resolveFeatureOption('local-only', defaultOption)).toBe(
-      isInCi ? false : defaultOption,
+      defaultOption,
     )
   })
 
@@ -43,18 +79,16 @@ describe('resolveFeatureOption', () => {
   })
 
   test('object with CI enabled', () => {
+    vi.stubEnv('CI', 'true')
+
     {
       const value = { enabled: 'ci-only' as const, a: 42 }
-      expect(resolveFeatureOption(value, defaultOption)).toBe(
-        isInCi ? value : false,
-      )
+      expect(resolveFeatureOption(value, defaultOption)).toBe(value)
     }
 
     {
       const value = { enabled: 'local-only' as const, a: 42 }
-      expect(resolveFeatureOption(value, defaultOption)).toBe(
-        isInCi ? false : value,
-      )
+      expect(resolveFeatureOption(value, defaultOption)).toBe(false)
     }
   })
 })

src/config/options.test.ts

@@ -3,7 +3,6 @@ import path from 'node:path'
 import process from 'node:process'
 import { blue } from 'ansis'
 import { createDefu } from 'defu'
-import isInCi from 'is-in-ci'
 import { createDebug } from 'obug'
 import { readTsconfig } from 'rolldown-plugin-dts/internal'
 import { resolveClean } from '../features/clean.ts'
@@ -14,6 +13,7 @@ import { hasExportsTypes } from '../features/pkg/exports.ts'
 import { flattenPlugins } from '../features/plugin.ts'
 import { resolveTarget } from '../features/target.ts'
 import { resolveTsconfig } from '../features/tsconfig.ts'
+import { isInCI } from '../utils/ci.ts'
 import {
   pkgExists,
   resolveComma,
@@ -461,8 +461,8 @@ export function resolveFeatureOption<T>(
 }
 
 function resolveCIOption(value: boolean | CIOption): boolean {
-  if (value === 'ci-only') return isInCi ? true : false
-  if (value === 'local-only') return isInCi ? false : true
+  if (value === 'ci-only') return isInCI()
+  if (value === 'local-only') return !isInCI()
   return value
 }
 

src/config/options.ts

@@ -0,0 +1,6 @@
+import process from 'node:process'
+
+export function isInCI(): boolean {
+  const ci = process.env.CI
+  return ci != null && ci !== '0' && ci.toLowerCase() !== 'false'
+}