Convert to using exports in package.json

package.json

@@ -2,8 +2,19 @@
   "name": "@gmod/vcf",
   "version": "6.0.1",
   "description": "High performance streaming Variant Call Format (VCF) parser in pure JavaScript",
-  "main": "dist/index.js",
-  "module": "esm/index.js",
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    "import": {
+      "types": "./esm/index.d.ts",
+      "import": "./esm/index.js"
+    },
+    "require": {
+      "types": "./dist/index.d.ts",
+      "require": "./dist/index.js"
+    }
+  },
   "repository": "github:GMOD/vcf-js",
   "author": {
     "name": "Garrett Stevens",
@@ -33,6 +44,7 @@
     "build:es5": "tsc --target es2015 --module commonjs --outDir dist",
     "build": "yarn build:esm && yarn build:es5",
     "prebuild": "yarn clean && yarn lint",
+    "postbuild:es5": "echo '{\"type\": \"commonjs\"}' > dist/package.json",
     "preversion": "yarn lint && yarn test --run && yarn build",
     "version": "standard-changelog && git add CHANGELOG.md",
     "postversion": "git push --follow-tags"

src/index.ts

@@ -75,6 +75,6 @@ export function parseBreakend(breakendString: string): Breakend | undefined {
   return undefined
 }
 
-export type { Variant } from './parse'
+export type { Variant } from './parse.ts'
 
-export { default } from './parse'
+export { default } from './parse.ts'

src/parse.ts

@@ -1,5 +1,5 @@
-import { parseMetaString } from './parseMetaString'
-import vcfReserved from './vcfReserved'
+import { parseMetaString } from './parseMetaString.ts'
+import vcfReserved from './vcfReserved.ts'
 
 function decodeURIComponentNoThrow(uri: string) {
   try {

tsconfig.json

@@ -11,6 +11,8 @@
     "noImplicitReturns": true,
     "noFallthroughCasesInSwitch": true,
     "noUncheckedIndexedAccess": true,
+    "allowImportingTsExtensions": true,
+    "rewriteRelativeImportExtensions": true,
     "esModuleInterop": true
   }
 }