Make library work with node.js ES modules (#257)

Author: andywer

index.mjs

@@ -0,0 +1,9 @@
+import Threads from "./dist/index.js"
+
+export const registerSerializer = Threads.registerSerializer
+export const spawn = Threads.spawn
+export const DefaultSerializer = Threads.DefaultSerializer
+export const Pool = Threads.Pool
+export const Thread = Threads.Thread
+export const Transfer = Threads.Transfer
+export const Worker = Threads.Worker

observable.mjs

@@ -1 +1,4 @@
-export * from "./dist-esm/observable"
+import Observables from "./dist/observable.js"
+
+export const Observable = Observables.Observable
+export const Subject = Observables.Subject

package.json

@@ -4,6 +4,12 @@
   "description": "Web workers & worker threads as simple as a function call",
   "main": "dist/index.js",
   "module": "dist-esm/index.js",
+  "exports": {
+    ".": "./index.mjs",
+    "./observable": "./observable.mjs",
+    "./register": "./register.mjs",
+    "./worker": "./worker.mjs"
+  },
   "scripts": {
     "prebuild": "rimraf dist/ dist-esm/",
     "build": "run-p build:cjs build:es",

register.mjs

@@ -1 +1 @@
-export * from "./dist-esm/master/register"
+import "./dist/master/register.js"

src/master/implementation.node.ts

@@ -64,7 +64,8 @@ function rebaseScriptPath(scriptPath: string, ignoreRegex: RegExp) {
     )
   })
 
-  const callerPath = parentCallSite ? parentCallSite.getFileName() : null
+  const rawCallerPath = parentCallSite ? parentCallSite.getFileName() : null
+  const callerPath = rawCallerPath ? rawCallerPath.replace(/^file:\//, "") : null
   const rebasedScriptPath = callerPath ? path.join(path.dirname(callerPath), scriptPath) : scriptPath
 
   return rebasedScriptPath

worker.mjs

@@ -1 +1,5 @@
-export * from "./dist-esm/worker/index"
+import WorkerContext from "./dist/worker/index.js"
+
+export const expose = WorkerContext.expose
+export const registerSerializer = WorkerContext.registerSerializer
+export const Transfer = WorkerContext.Transfer