feat(esm): add Node.js ESM/CJS interop support

Add `export { x as 'module.exports' }` hint to all default exports
and use .default accessor when requiring ESM modules:
- maintained-node-versions
- package-default-node-range
- package-default-socket-categories
- package-extensions
- lifecycle-script-names

The export hint documents intended ESM/CJS interop behavior while
.default accessors handle frozen objects at runtime.

Author: jdalton

src/constants/node.ts

@@ -24,7 +24,7 @@ let _maintainedNodeVersions:
   | undefined
 export function getMaintainedNodeVersions() {
   if (_maintainedNodeVersions === undefined) {
-    _maintainedNodeVersions = require('#lib/maintained-node-versions')
+    _maintainedNodeVersions = require('#lib/maintained-node-versions').default
   }
   return _maintainedNodeVersions
 }

src/constants/packages.ts

@@ -20,7 +20,8 @@ export const PACKAGE_DEFAULT_VERSION = '1.0.0'
 // Package default Node range.
 export function getPackageDefaultNodeRange(): string | undefined {
   if (_packageDefaultNodeRange === undefined) {
-    _packageDefaultNodeRange = require('#lib/package-default-node-range')
+    _packageDefaultNodeRange =
+      require('#lib/package-default-node-range').default
   }
   return _packageDefaultNodeRange
 }
@@ -29,15 +30,15 @@ export function getPackageDefaultNodeRange(): string | undefined {
 export function getPackageDefaultSocketCategories() {
   if (_packageDefaultSocketCategories === undefined) {
     _packageDefaultSocketCategories =
-      require('#lib/package-default-socket-categories')
+      require('#lib/package-default-socket-categories').default
   }
   return _packageDefaultSocketCategories
 }
 
 // Package extensions.
 export function getPackageExtensions(): Iterable<[string, unknown]> {
   if (_packageExtensions === undefined) {
-    const exts = require('#lib/package-extensions')
+    const exts = require('#lib/package-extensions').default
     _packageExtensions = Object.entries(exts)
   }
   return _packageExtensions
@@ -51,7 +52,7 @@ export function getNpmLifecycleEvent(): string | undefined {
 // Lifecycle script names.
 export function getLifecycleScriptNames(): string[] {
   if (_lifecycleScriptNames === undefined) {
-    const scriptNamesSet = require('#lib/lifecycle-script-names')
+    const scriptNamesSet = require('#lib/lifecycle-script-names').default
     _lifecycleScriptNames = Array.from(scriptNamesSet)
   }
   return _lifecycleScriptNames

src/lifecycle-script-names.ts

@@ -5,7 +5,7 @@
  * https://docs.npmjs.com/cli/v10/using-npm/scripts#life-cycle-scripts
  */
 
-export default new Set(
+const lifecycleScriptNames = new Set(
   [
     'dependencies',
     'prepublishOnly',
@@ -21,3 +21,6 @@ export default new Set(
     ].map(n => [`pre${n}`, n, `post${n}`]),
   ].flat(),
 )
+
+export default lifecycleScriptNames
+export { lifecycleScriptNames as 'module.exports' }

src/maintained-node-versions.ts

@@ -22,7 +22,7 @@ const current = '22.20.0'
 const previous = '20.19.5'
 const last = '18.20.8'
 
-export default ObjectFreeze(
+const maintainedNodeVersions = ObjectFreeze(
   Object.assign([last, previous, current, next], {
     current,
     last,
@@ -35,3 +35,6 @@ export default ObjectFreeze(
   next: string
   previous: string
 }
+
+export default maintainedNodeVersions
+export { maintainedNodeVersions as 'module.exports' }

src/package-default-node-range.ts

@@ -2,7 +2,10 @@
  * @fileoverview Default Node.js version range for packages.
  */
 
-const maintainedNodeVersions = require('#lib/maintained-node-versions')
+const maintainedNodeVersions = require('#lib/maintained-node-versions').default
 const semver = require('./external/semver')
 
-export default `>=${semver.parse(maintainedNodeVersions.last).major}`
+const packageDefaultNodeRange = `>=${semver.parse(maintainedNodeVersions.last).major}`
+
+export default packageDefaultNodeRange
+export { packageDefaultNodeRange as 'module.exports' }

src/package-default-socket-categories.ts

@@ -3,4 +3,7 @@
  */
 
 // Default category for new packages
-export default Object.freeze(['cleanup'])
+const packageDefaultSocketCategories = Object.freeze(['cleanup'])
+
+export default packageDefaultSocketCategories
+export { packageDefaultSocketCategories as 'module.exports' }

src/package-extensions.ts

@@ -9,7 +9,7 @@ const { freeze: ObjectFreeze } = Object
 
 const yarnPkgExtensions = require('./external/@yarnpkg/extensions')
 
-export default ObjectFreeze(
+const packageExtensions = ObjectFreeze(
   [
     yarnPkgExtensions.packageExtensions,
     [
@@ -50,3 +50,6 @@ export default ObjectFreeze(
     return 0
   }),
 )
+
+export default packageExtensions
+export { packageExtensions as 'module.exports' }