diff --git a/src/NetscriptJSPreamble.js b/src/NetscriptJSPreamble.js
deleted file mode 100644
index 2fd35b6dc..000000000
--- a/src/NetscriptJSPreamble.js
+++ /dev/null
@@ -1,42 +0,0 @@
-// A utility function that adds a preamble to each Netscript JS
-// script. This preamble will set all the global functions and
-// variables appropriately for the module.
-//
-// One caveat is that we don't allow the variables in the preable
-// to change. Unlike in normal Javascript, this would not change
-// properties of self. It would instead just change the variable
-// within the given module -- not good! Users should not really
-// need to do this anyway.
-
-import uuidv4 from "uuid/v4";
-import {sprintf} from "sprintf-js";
-
-window.__NSJS__environments = {};
-
-// Returns the UUID for the env.
-export function registerEnv(env) {
-    const uuid = uuidv4();
-    window.__NSJS__environments[uuid] = env;
-    return uuid;
-}
-
-export function unregisterEnv(uuid) {
-    delete window.__NSJS__environments[uuid];
-}
-
-export function makeEnvHeader(uuid) {
-    if (!(uuid in window.__NSJS__environments)) throw new Error("uuid is not in the environment" + uuid);
-
-    const env = window.__NSJS__environments[uuid];
-    var envLines = [];
-    for (const prop in env) {
-        envLines.push("const ", prop, " = ", "__NSJS_ENV[\"", prop, "\"];\n");
-    }
-
-    return sprintf(`
-        'use strict';
-        const __NSJS_ENV = window.__NSJS__environments['%s'];
-        // The global variable assignments (hack, weaken, etc.).
-        %s
-    `, uuid, envLines.join(""));
-}
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