diff --git a/__tests__/lossless.ts b/__tests__/lossless.ts
index d365389..3dd81d2 100644
--- a/__tests__/lossless.ts
+++ b/__tests__/lossless.ts
@@ -1,6 +1,6 @@
-import {Delta, DeltaFilter} from '../src/delta.js';
-import {Lossless} from '../src/lossless.js';
-import {RhizomeNode} from '../src/node.js';
+import {Delta, DeltaFilter} from '../src/delta';
+import {Lossless} from '../src/lossless';
+import {RhizomeNode} from '../src/node';
 
 describe('Lossless', () => {
   const node = new RhizomeNode();
diff --git a/__tests__/lossy.ts b/__tests__/lossy.ts
index 605a103..1b1fe12 100644
--- a/__tests__/lossy.ts
+++ b/__tests__/lossy.ts
@@ -1,9 +1,9 @@
 import Debug from 'debug';
-import {Delta, PointerTarget} from "../src/delta.js";
-import {lastValueFromDeltas} from "../src/last-write-wins.js";
-import {Lossless, LosslessViewOne} from "../src/lossless.js";
-import {Lossy, valueFromCollapsedDelta} from "../src/lossy.js";
-import {RhizomeNode} from "../src/node.js";
+import {Delta, PointerTarget} from "../src/delta";
+import {lastValueFromDeltas} from "../src/last-write-wins";
+import {Lossless, LosslessViewOne} from "../src/lossless";
+import {Lossy, valueFromCollapsedDelta} from "../src/lossy";
+import {RhizomeNode} from "../src/node";
 const debug = Debug('test:lossy');
 
 type Role = {
diff --git a/__tests__/peer-address.ts b/__tests__/peer-address.ts
index 3dbaafc..626b590 100644
--- a/__tests__/peer-address.ts
+++ b/__tests__/peer-address.ts
@@ -1,4 +1,4 @@
-import {parseAddressList, PeerAddress} from '../src/peers.js';
+import {parseAddressList, PeerAddress} from '../src/peers';
 
 describe('PeerAddress', () => {
   it('toString()', () => {
diff --git a/__tests__/run/001-single-node.ts b/__tests__/run/001-single-node.ts
index aad9f96..bc5f114 100644
--- a/__tests__/run/001-single-node.ts
+++ b/__tests__/run/001-single-node.ts
@@ -1,4 +1,4 @@
-import {App} from "../../util/app.js";
+import {App} from "../../util/app";
 
 describe('Run', () => {
   let app: App;
diff --git a/__tests__/run/002-two-nodes.ts b/__tests__/run/002-two-nodes.ts
index 23a5254..add6aaf 100644
--- a/__tests__/run/002-two-nodes.ts
+++ b/__tests__/run/002-two-nodes.ts
@@ -1,5 +1,5 @@
 import Debug from 'debug';
-import {App} from '../../util/app.js';
+import {App} from '../../util/app';
 const debug = Debug('test:two');
 
 describe('Run', () => {
diff --git a/examples/app.ts b/examples/app.ts
index e2cd75a..d7d38ac 100644
--- a/examples/app.ts
+++ b/examples/app.ts
@@ -1,7 +1,7 @@
 import Debug from 'debug';
-import {Collection} from "../src/collection.js";
-import {Entity} from "../src/entity.js";
-import {RhizomeNode} from "../src/node.js";
+import {Collection} from "../src/collection";
+import {Entity} from "../src/entity";
+import {RhizomeNode} from "../src/node";
 const debug = Debug('example-app');
 
 // As an app we want to be able to write and read data.
diff --git a/package.json b/package.json
index c5df3aa..3631039 100644
--- a/package.json
+++ b/package.json
@@ -19,21 +19,7 @@
     ],
     "testMatch": [
       "**/__tests__/**/*"
-    ],
-    "transform": {
-      "^.+\\.ts$": [
-        "ts-jest",
-        {
-          "useESM": true
-        }
-      ]
-    },
-    "extensionsToTreatAsEsm": [
-      ".ts"
-    ],
-    "moduleNameMapper": {
-      "^(\\.{1,2}/.*)\\.js$": "$1"
-    }
+    ]
   },
   "author": "Taliesin (Ladd) <ladd@dgov.io>",
   "license": "Unlicense",
diff --git a/src/collection.ts b/src/collection.ts
index b03b8e6..49a54d2 100644
--- a/src/collection.ts
+++ b/src/collection.ts
@@ -6,11 +6,11 @@
 import Debug from 'debug';
 import {randomUUID} from "node:crypto";
 import EventEmitter from "node:events";
-import {Delta} from "./delta.js";
-import {Entity, EntityProperties} from "./entity.js";
-import {LastWriteWins, ResolvedViewOne} from './last-write-wins.js';
-import {RhizomeNode} from "./node.js";
-import {DomainEntityID} from "./types.js";
+import {Delta} from "./delta";
+import {Entity, EntityProperties} from "./entity";
+import {LastWriteWins, ResolvedViewOne} from './last-write-wins';
+import {RhizomeNode} from "./node";
+import {DomainEntityID} from "./types";
 const debug = Debug('rz:collection');
 
 export class Collection {
diff --git a/src/delta.ts b/src/delta.ts
index 1cc2d28..8dce43f 100644
--- a/src/delta.ts
+++ b/src/delta.ts
@@ -1,7 +1,7 @@
 import {randomUUID} from "crypto";
 import microtime from 'microtime';
-import {CreatorID, HostID, Timestamp, TransactionID} from "./types.js";
-import {PeerAddress} from "./peers.js";
+import {CreatorID, HostID, Timestamp, TransactionID} from "./types";
+import {PeerAddress} from "./peers";
 
 export type DeltaID = string;
 
diff --git a/src/deltas.ts b/src/deltas.ts
index 6cd62e4..99382df 100644
--- a/src/deltas.ts
+++ b/src/deltas.ts
@@ -1,8 +1,8 @@
 import Debug from 'debug';
 import EventEmitter from 'node:events';
 import objectHash from 'object-hash';
-import {Delta, DeltaNetworkImage} from './delta.js';
-import {RhizomeNode} from './node.js';
+import {Delta, DeltaNetworkImage} from './delta';
+import {RhizomeNode} from './node';
 const debug = Debug('rz:deltas');
 
 enum Decision {
diff --git a/src/entity.ts b/src/entity.ts
index 7dd7fc1..616da1b 100644
--- a/src/entity.ts
+++ b/src/entity.ts
@@ -7,8 +7,8 @@
 // - As typescript interfaces?
 // - As typescript classes?
 
-import {Collection} from "./collection.js";
-import {PropertyTypes} from "./types.js";
+import {Collection} from "./collection";
+import {PropertyTypes} from "./types";
 
 export type EntityProperties = {
   [key: string]: PropertyTypes;
diff --git a/src/filter/index.ts b/src/filter/index.ts
index c6d347a..38ad0d5 100644
--- a/src/filter/index.ts
+++ b/src/filter/index.ts
@@ -1,5 +1,5 @@
 import { add_operation, apply } from 'json-logic-js';
-import { Delta } from '../delta.js';
+import { Delta } from '../delta';
 
 type DeltaContext = Delta & {
   creatorAddress: string;
diff --git a/src/filter/known.ts b/src/filter/known.ts
index 3ee0f57..13b5bd9 100644
--- a/src/filter/known.ts
+++ b/src/filter/known.ts
@@ -1,4 +1,4 @@
-import { FilterExpr } from "../types.js";
+import { FilterExpr } from "../types";
 // import { map } from 'radash';
 
 // A creator as seen by a host
diff --git a/src/http/api.ts b/src/http/api.ts
index 0ff7f4e..e9dbb80 100644
--- a/src/http/api.ts
+++ b/src/http/api.ts
@@ -1,7 +1,7 @@
 import express, {Router} from "express";
-import {Collection} from "../collection.js";
-import {Delta} from "../delta.js";
-import {RhizomeNode} from "../node.js";
+import {Collection} from "../collection";
+import {Delta} from "../delta";
+import {RhizomeNode} from "../node";
 
 export class HttpApi {
   router = Router();
diff --git a/src/http/html.ts b/src/http/html.ts
index aeea65c..925abcf 100644
--- a/src/http/html.ts
+++ b/src/http/html.ts
@@ -1,6 +1,6 @@
 import express, {Router} from "express";
-import {RhizomeNode} from "../node.js";
-import {htmlDocFromMarkdown, MDFiles} from "../util/md-files.js";
+import {RhizomeNode} from "../node";
+import {htmlDocFromMarkdown, MDFiles} from "../util/md-files";
 
 export class HttpHtml {
   router = Router();
diff --git a/src/http/index.ts b/src/http/index.ts
index 39cfa5a..801e22b 100644
--- a/src/http/index.ts
+++ b/src/http/index.ts
@@ -1,9 +1,9 @@
 import Debug from "debug";
 import express from "express";
 import {Server} from "http";
-import {RhizomeNode} from "../node.js";
-import {HttpApi} from "./api.js";
-import {HttpHtml} from "./html.js";
+import {RhizomeNode} from "../node";
+import {HttpApi} from "./api";
+import {HttpHtml} from "./html";
 const debug = Debug('rz:http-api');
 
 export class HttpServer {
diff --git a/src/last-write-wins.ts b/src/last-write-wins.ts
index 0652575..8610d6e 100644
--- a/src/last-write-wins.ts
+++ b/src/last-write-wins.ts
@@ -1,8 +1,8 @@
 // import Debug from 'debug';
-import {EntityProperties} from "./entity.js";
-import {CollapsedDelta, Lossless, LosslessViewOne} from "./lossless.js";
-import {Lossy, valueFromCollapsedDelta} from './lossy.js';
-import {DomainEntityID, PropertyID, PropertyTypes, Timestamp, ViewMany} from "./types.js";
+import {EntityProperties} from "./entity";
+import {CollapsedDelta, Lossless, LosslessViewOne} from "./lossless";
+import {Lossy, valueFromCollapsedDelta} from './lossy';
+import {DomainEntityID, PropertyID, PropertyTypes, Timestamp, ViewMany} from "./types";
 // const debug = Debug('rz:lossy:last-write-wins');
 
 type TimestampedProperty = {
diff --git a/src/lossless.ts b/src/lossless.ts
index 54fae05..cf19c49 100644
--- a/src/lossless.ts
+++ b/src/lossless.ts
@@ -3,10 +3,10 @@
 
 import Debug from 'debug';
 import EventEmitter from 'events';
-import {Delta, DeltaFilter, DeltaID, DeltaNetworkImage} from './delta.js';
-import {RhizomeNode} from './node.js';
-import {Transactions} from './transactions.js';
-import {DomainEntityID, PropertyID, PropertyTypes, TransactionID, ViewMany} from "./types.js";
+import {Delta, DeltaFilter, DeltaID, DeltaNetworkImage} from './delta';
+import {RhizomeNode} from './node';
+import {Transactions} from './transactions';
+import {DomainEntityID, PropertyID, PropertyTypes, TransactionID, ViewMany} from "./types";
 const debug = Debug('rz:lossless');
 
 export type CollapsedPointer = {[key: PropertyID]: PropertyTypes};
diff --git a/src/lossy.ts b/src/lossy.ts
index 17118b5..a97af41 100644
--- a/src/lossy.ts
+++ b/src/lossy.ts
@@ -3,9 +3,9 @@
 // into various possible "lossy" views that combine or exclude some information.
 
 import Debug from 'debug';
-import {DeltaFilter, DeltaID} from "./delta.js";
-import {CollapsedDelta, Lossless, LosslessViewOne} from "./lossless.js";
-import {DomainEntityID} from "./types.js";
+import {DeltaFilter, DeltaID} from "./delta";
+import {CollapsedDelta, Lossless, LosslessViewOne} from "./lossless";
+import {DomainEntityID} from "./types";
 const debug = Debug('rz:lossy');
 
 export type Initializer<Accumulator> = (v: LosslessViewOne) => Accumulator;
diff --git a/src/node.ts b/src/node.ts
index 1df34ce..22c8cbd 100644
--- a/src/node.ts
+++ b/src/node.ts
@@ -1,11 +1,11 @@
 import Debug from 'debug';
-import {CREATOR, HTTP_API_ADDR, HTTP_API_ENABLE, HTTP_API_PORT, PEER_ID, PUBLISH_BIND_ADDR, PUBLISH_BIND_HOST, PUBLISH_BIND_PORT, REQUEST_BIND_ADDR, REQUEST_BIND_HOST, REQUEST_BIND_PORT, SEED_PEERS} from './config.js';
-import {DeltaStream} from './deltas.js';
-import {HttpServer} from './http/index.js';
-import {Lossless} from './lossless.js';
-import {parseAddressList, PeerAddress, Peers} from './peers.js';
-import {PubSub} from './pub-sub.js';
-import {RequestReply} from './request-reply.js';
+import {CREATOR, HTTP_API_ADDR, HTTP_API_ENABLE, HTTP_API_PORT, PEER_ID, PUBLISH_BIND_ADDR, PUBLISH_BIND_HOST, PUBLISH_BIND_PORT, REQUEST_BIND_ADDR, REQUEST_BIND_HOST, REQUEST_BIND_PORT, SEED_PEERS} from './config';
+import {DeltaStream} from './deltas';
+import {HttpServer} from './http/index';
+import {Lossless} from './lossless';
+import {parseAddressList, PeerAddress, Peers} from './peers';
+import {PubSub} from './pub-sub';
+import {RequestReply} from './request-reply';
 const debug = Debug('rz:rhizome-node');
 
 export type RhizomeNodeConfig = {
diff --git a/src/peers.ts b/src/peers.ts
index 77a2d9c..3d79d76 100644
--- a/src/peers.ts
+++ b/src/peers.ts
@@ -1,9 +1,9 @@
 import Debug from 'debug';
 import {Message} from 'zeromq';
-import {Delta} from "./delta.js";
-import {RhizomeNode} from "./node.js";
-import {Subscription} from './pub-sub.js';
-import {PeerRequest, RequestSocket, ResponseSocket} from "./request-reply.js";
+import {Delta} from "./delta";
+import {RhizomeNode} from "./node";
+import {Subscription} from './pub-sub';
+import {PeerRequest, RequestSocket, ResponseSocket} from "./request-reply";
 const debug = Debug('rz:peers');
 
 export class PeerAddress {
diff --git a/src/pub-sub.ts b/src/pub-sub.ts
index c40bee6..83088f3 100644
--- a/src/pub-sub.ts
+++ b/src/pub-sub.ts
@@ -1,7 +1,7 @@
 import Debug from 'debug';
 import {Publisher, Subscriber} from 'zeromq';
-import {RhizomeNode} from './node.js';
-import {PeerAddress} from './peers.js';
+import {RhizomeNode} from './node';
+import {PeerAddress} from './peers';
 const debug = Debug('rz:pub-sub');
 
 export type SubscribedMessageHandler = (sender: PeerAddress, msg: string) => void;
diff --git a/src/request-reply.ts b/src/request-reply.ts
index 940776c..11c23f5 100644
--- a/src/request-reply.ts
+++ b/src/request-reply.ts
@@ -1,8 +1,8 @@
 import Debug from 'debug';
 import {EventEmitter} from 'node:events';
 import {Message, Reply, Request} from 'zeromq';
-import {RhizomeNode} from './node.js';
-import {PeerAddress, RequestMethods} from './peers.js';
+import {RhizomeNode} from './node';
+import {PeerAddress, RequestMethods} from './peers';
 const debug = Debug('rz:request-reply');
 
 export type PeerRequest = {
diff --git a/src/store.ts b/src/store.ts
index f8244b5..85d3838 100644
--- a/src/store.ts
+++ b/src/store.ts
@@ -1,5 +1,5 @@
 import { Level } from 'level';
-import { LEVEL_DB_DIR } from './config.js';
+import { LEVEL_DB_DIR } from './config';
 import path from 'path';
 
 function newStore(name: string): Level {
diff --git a/src/transactions.ts b/src/transactions.ts
index e6db31a..b8abb3e 100644
--- a/src/transactions.ts
+++ b/src/transactions.ts
@@ -1,8 +1,8 @@
 import Debug from "debug";
 import EventEmitter from "events";
-import {Delta, DeltaID} from "./delta.js";
-import {Lossless} from "./lossless.js";
-import {DomainEntityID, TransactionID} from "./types.js";
+import {Delta, DeltaID} from "./delta";
+import {Lossless} from "./lossless";
+import {DomainEntityID, TransactionID} from "./types";
 const debug = Debug('rz:transactions');
 
 function getDeltaTransactionId(delta: Delta): TransactionID | undefined {
diff --git a/src/util/md-files.ts b/src/util/md-files.ts
index 1f588e9..3103075 100644
--- a/src/util/md-files.ts
+++ b/src/util/md-files.ts
@@ -2,7 +2,7 @@ import Debug from "debug";
 import {FSWatcher, readdirSync, readFileSync, watch} from "fs";
 import path, {join} from "path";
 import showdown from "showdown";
-import {RhizomeNode} from "../node.js";
+import {RhizomeNode} from "../node";
 const {Converter} = showdown;
 const debug = Debug('rz:md-files');
 
diff --git a/tsconfig.json b/tsconfig.json
index 49cade1..c482a52 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,17 +1,12 @@
 {
   "compilerOptions": {
-    "target": "ESNext",
-    "module": "ESNext",
+    "target": "ES6",
+    "module": "CommonJS",
     "esModuleInterop": true,
-    "moduleResolution": "bundler",
+    "moduleResolution": "Node",
     "sourceMap": false,
-    "isolatedModules": true,
-    /* "allowImportingTsExtensions": true, */
-    /* "noEmit": true, */
     "baseUrl": ".",
     "outDir": "dist",
-    "lib": ["ESNext"],
-    "types": ["node", "jest"],
     "importsNotUsedAsValues": "remove",
     "strict": true,
     "skipLibCheck": true,
@@ -24,10 +19,5 @@
     "scratch/**/*",
     "__tests__/**/*"
   ],
-  "exclude": [
-    "node_modules"
-  ],
-  "tsc-alias": {
-    "resolveFullPaths": true
-  }
+  "exclude": ["node_modules"]
 }
diff --git a/util/app.ts b/util/app.ts
index 76b15ac..5bbf7e6 100644
--- a/util/app.ts
+++ b/util/app.ts
@@ -1,5 +1,5 @@
-import {Collection} from "../src/collection.js";
-import {RhizomeNode, RhizomeNodeConfig} from "../src/node.js";
+import {Collection} from "../src/collection";
+import {RhizomeNode, RhizomeNodeConfig} from "../src/node";
 
 const start = 5000;
 const range = 5000;