diff --git a/src/index.ts b/src/index.ts
index 973c5a7..5809520 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-import { detectProvider } from './providers'
+import { detectProvider, ProviderName } from './providers'
 
 export type { ProviderName, ProviderInfo } from './providers'
 
@@ -11,7 +11,7 @@ const nodeENV = envShim.NODE_ENV || ''
 export const platform = processShim.platform
 
 /** Current current provider name */
-export const provider = providerInfo.name
+export const provider: ProviderName = providerInfo.name
 
 /** Detect if `CI` environment variable is set or a provider CI detected */
 export const isCI = toBoolean(envShim.CI) || providerInfo.ci !== false
diff --git a/src/providers.ts b/src/providers.ts
index 8c3cc03..723c8ef 100644
--- a/src/providers.ts
+++ b/src/providers.ts
@@ -1,51 +1,60 @@
 // Reference: https://github.com/watson/ci-info/blob/v3.2.0/vendors.json
 
-type InternalProvider = [vendorName: string, envName?: string, meta?: Record<string, any>]
+
+export type ProviderName =
+  'appveyor' | 'azure_pipelines' | 'azure_static' | 'appcircle' | 'bamboo' |
+  'bitbucket' | 'bitrise' | 'buddy' | 'buildkite' | 'circle' | 'cirrus' |
+  'codebuild' | 'codefresh' | 'drone' | 'drone' | 'dsari' | 'github_actions' |
+  'gitlab' | 'gitlab' | 'gocd' | 'layerci' | 'hudson' | 'jenkins' | 'magnum' |
+  'netlify' | 'netlify' | 'nevercode' | 'render' | 'sail' | 'semaphore' |
+  'screwdriver' | 'shippable' | 'solano' | 'strider' | 'teamcity' | 'travis' |
+  'vercel' | 'appcenter' | 'codesandbox' | 'stackblitz'
+
+type InternalProvider = [providerName: Uppercase<ProviderName>, envName?: string, meta?: Record<string, any>]
 
 const providers: InternalProvider[] = [
-  ["APPVEYOR"],
-  ["AZURE_PIPELINES", "SYSTEM_TEAMFOUNDATIONCOLLECTIONURI"],
-  ["AZURE_STATIC", "INPUT_AZURE_STATIC_WEB_APPS_API_TOKEN"],
-  ["APPCIRCLE", "AC_APPCIRCLE"],
-  ["BAMBOO", "bamboo_planKey"],
-  ["BITBUCKET", "BITBUCKET_COMMIT"],
-  ["BITRISE", "BITRISE_IO"],
-  ["BUDDY", "BUDDY_WORKSPACE_ID"],
-  ["BUILDKITE"],
-  ["CIRCLE", "CIRCLECI"],
-  ["CIRRUS", "CIRRUS_CI"],
-  ["CODEBUILD", "CODEBUILD_BUILD_ARN"],
-  ["CODEFRESH", "CF_BUILD_ID"],
-  ["DRONE"],
-  ["DRONE", "DRONE_BUILD_EVENT"],
-  ["DSARI"],
-  ["GITHUB_ACTIONS"],
-  ["GITLAB", "GITLAB_CI"],
-  ["GITLAB", "CI_MERGE_REQUEST_ID"],
-  ["GOCD", "GO_PIPELINE_LABEL"],
-  ["LAYERCI"],
-  ["HUDSON", "HUDSON_URL"],
-  ["JENKINS", "JENKINS_URL"],
-  ["MAGNUM"],
-  ["NETLIFY"],
-  ["NETLIFY", "NETLIFY_LOCAL", { ci: false }],
-  ["NEVERCODE"],
-  ["RENDER"],
-  ["SAIL", "SAILCI"],
-  ["SEMAPHORE"],
-  ["SCREWDRIVER"],
-  ["SHIPPABLE"],
-  ["SOLANO", "TDDIUM"],
-  ["STRIDER"],
-  ["TEAMCITY", "TEAMCITY_VERSION"],
-  ["TRAVIS"],
-  ["VERCEL", "NOW_BUILDER"],
-  ["APPCENTER", "APPCENTER_BUILD_ID"],
-  ["CODESANDBOX", "CODESANDBOX_SSE", { ci: false }],
-  ["STACKBLITZ"],
+  ['APPVEYOR'],
+  ['AZURE_PIPELINES', 'SYSTEM_TEAMFOUNDATIONCOLLECTIONURI'],
+  ['AZURE_STATIC', 'INPUT_AZURE_STATIC_WEB_APPS_API_TOKEN'],
+  ['APPCIRCLE', 'AC_APPCIRCLE'],
+  ['BAMBOO', 'bamboo_planKey'],
+  ['BITBUCKET', 'BITBUCKET_COMMIT'],
+  ['BITRISE', 'BITRISE_IO'],
+  ['BUDDY', 'BUDDY_WORKSPACE_ID'],
+  ['BUILDKITE'],
+  ['CIRCLE', 'CIRCLECI'],
+  ['CIRRUS', 'CIRRUS_CI'],
+  ['CODEBUILD', 'CODEBUILD_BUILD_ARN'],
+  ['CODEFRESH', 'CF_BUILD_ID'],
+  ['DRONE'],
+  ['DRONE', 'DRONE_BUILD_EVENT'],
+  ['DSARI'],
+  ['GITHUB_ACTIONS'],
+  ['GITLAB', 'GITLAB_CI'],
+  ['GITLAB', 'CI_MERGE_REQUEST_ID'],
+  ['GOCD', 'GO_PIPELINE_LABEL'],
+  ['LAYERCI'],
+  ['HUDSON', 'HUDSON_URL'],
+  ['JENKINS', 'JENKINS_URL'],
+  ['MAGNUM'],
+  ['NETLIFY'],
+  ['NETLIFY', 'NETLIFY_LOCAL', { ci: false }],
+  ['NEVERCODE'],
+  ['RENDER'],
+  ['SAIL', 'SAILCI'],
+  ['SEMAPHORE'],
+  ['SCREWDRIVER'],
+  ['SHIPPABLE'],
+  ['SOLANO', 'TDDIUM'],
+  ['STRIDER'],
+  ['TEAMCITY', 'TEAMCITY_VERSION'],
+  ['TRAVIS'],
+  ['VERCEL', 'NOW_BUILDER'],
+  ['APPCENTER', 'APPCENTER_BUILD_ID'],
+  ['CODESANDBOX', 'CODESANDBOX_SSE', { ci: false }],
+  ['STACKBLITZ'],
 ]
 
-export type ProviderName = Lowercase<(typeof providers)[number][0]>
 export type ProviderInfo = { name: ProviderName, [meta: string]: any }
 
 export function detectProvider(env: Record<string, string>): ProviderInfo | null {