run npm install to generate a package lock

node_modules/@weborigami/language/index.ts

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+import { Packed } from "@weborigami/async-tree";
+
+export * from "./main.js";
+
+/**
+ * A chunk of compiled Origami code. This is just an array with an additional
+ * `location` property.
+ */
+export type Code = Array<any> & {
+  location: {
+    source: Source;
+    start: Position;
+    end: Position;
+  };
+  source: string;
+};
+
+/**
+ * A class constructor is an object with a `new` method that returns an
+ * instance of the indicated type.
+ */
+export type Constructor<T> = new (...args: any[]) => T;
+
+/**
+ * A structure associating a media type and an unpack function with a given file
+ * extension.
+ */
+export type ExtensionHandler = {
+  mediaType?: string;
+  unpack?: UnpackFunction;
+}
+
+export type Position = {
+  column: number;
+  line: number;
+  offset: number;
+}
+
+/**
+ * A mixin is a function that takes an existing class and returns a new class.
+ *
+ * The use of a generic type `T` here is a way of indicating that the members of
+ * the supplied base class automatically pass through to the result. That
+ * ensures the use of the mixin doesn't accidentally hide members of the class
+ * passed to the mixin.
+ */
+export type Mixin<MixinMembers> = <T>(
+  Base: Constructor<T>
+) => Constructor<T & MixinMembers>;
+
+/**
+ * Source code representation used by the parser.
+ */
+export type Source = {
+  name?: string;
+  text: string;
+  url?: URL;
+}
+
+/**
+ * A function that converts a value from a persistent form into a live value.
+ */
+export type UnpackFunction = (input: Packed, options?: any) => any;