chore(config): add generated config type foundation

.github/CODEOWNERS

@@ -183,6 +183,8 @@
 /packages/dd-trace/test/tagger.spec.js @DataDog/apm-sdk-capabilities-js
 /packages/dd-trace/test/tracer.spec.js @DataDog/apm-sdk-capabilities-js
 
+/scripts/generate-config-types.js @DataDog/apm-sdk-capabilities-js
+
 # Feature Flagging
 /integration-tests/openfeature/ @DataDog/feature-flagging
 /packages/dd-trace/src/openfeature/ @DataDog/feature-flagging

packages/dd-trace/src/config/config-base.d.ts

@@ -0,0 +1,7 @@
+import type { ConfigProperties } from './config-types'
+
+declare class ConfigBase {}
+
+interface ConfigBase extends ConfigProperties {}
+
+export = ConfigBase

packages/dd-trace/src/config/config-base.js

@@ -0,0 +1,5 @@
+'use strict'
+
+class ConfigBase {}
+
+module.exports = ConfigBase

packages/dd-trace/src/config/config-types.d.ts

@@ -0,0 +1,78 @@
+import type { GeneratedConfig } from './generated-config-types'
+
+type PayloadTaggingRules = ReturnType<typeof import('../payload-tagging/config').appendRules> | []
+
+export interface ConfigProperties extends GeneratedConfig {
+  cloudPayloadTagging: GeneratedConfig['cloudPayloadTagging'] & {
+    requestsEnabled: boolean
+    responsesEnabled: boolean
+    rules: PayloadTaggingRules
+  }
+  commitSHA: string | undefined
+  debug: boolean
+  gcpPubSubPushSubscriptionEnabled: boolean
+  instrumentationSource: 'manual' | 'ssi'
+  isAzureFunction: boolean
+  isCiVisibility: boolean
+  isGCPFunction: boolean
+  isServiceNameInferred: boolean
+  isServiceUserProvided: boolean
+  logger: import('../../../../index').TracerOptions['logger'] | undefined
+  lookup: NonNullable<import('../../../../index').TracerOptions['lookup']>
+  readonly parsedDdTags: Record<string, string>
+  plugins: boolean
+  repositoryUrl: string | undefined
+  rules: import('../../../../index').SamplingRule[]
+  sampler: {
+    rateLimit: number
+    rules: import('../../../../index').SamplingRule[]
+    sampleRate: number | undefined
+    spanSamplingRules: import('../../../../index').SpanSamplingRule[] | undefined
+  }
+  stableConfig: {
+    fleetEntries: Record<string, string>
+    localEntries: Record<string, string>
+    warnings: string[] | undefined
+  }
+  tracePropagationStyle: GeneratedConfig['tracePropagationStyle']
+}
+
+type Primitive = bigint | boolean | null | number | string | symbol | undefined
+type Terminal = Date | Function | Primitive | RegExp | URL
+
+type KnownStringKeys<T> = Extract<{
+  [K in keyof T]:
+    K extends string
+      ? string extends K
+        ? never
+        : K
+      : never
+}[keyof T], string>
+
+type NestedConfigPath<T> = [NonNullable<T>] extends [Terminal]
+  ? never
+  : [NonNullable<T>] extends [readonly unknown[]]
+    ? never
+    : [NonNullable<T>] extends [object]
+      ? ConfigPathFor<NonNullable<T>>
+      : never
+
+type ConfigPathFor<T> = {
+  [K in KnownStringKeys<T>]:
+    | K
+    | (NestedConfigPath<T[K]> extends never ? never : `${K}.${NestedConfigPath<T[K]>}`)
+}[KnownStringKeys<T>]
+
+type ConfigPathValueFor<T, TPath extends string> =
+  TPath extends `${infer TKey}.${infer TRest}`
+    ? TKey extends KnownStringKeys<T>
+      ? ConfigPathValueFor<NonNullable<T[TKey]>, TRest>
+      : never
+    : TPath extends KnownStringKeys<T>
+      ? T[TPath]
+      : never
+
+export type ConfigKey = KnownStringKeys<ConfigProperties>
+export type ConfigPath = ConfigPathFor<ConfigProperties>
+export type ConfigPathValue<TPath extends ConfigPath> = ConfigPathValueFor<ConfigProperties, TPath>
+export type ConfigDefaults = Partial<{ [TPath in ConfigPath]: ConfigPathValue<TPath> }>