It appears you have a well-structured Git repository with various files, including SVG icons and HTML documents. Here's a brief overview:

backend/node_modules/ts-interface-checker/dist/index.d.ts

@@ -0,0 +1,124 @@
+import { ITypeSuite, TType } from "./types";
+import { IErrorDetail } from "./util";
+/**
+ * Export functions used to define interfaces.
+ */
+export { TArray, TEnumType, TEnumLiteral, TFunc, TIface, TLiteral, TName, TOptional, TParam, TParamList, TProp, TTuple, TType, TUnion, TIntersection, array, enumlit, enumtype, func, iface, lit, name, opt, param, tuple, union, intersection, BasicType, ITypeSuite, } from "./types";
+export { VError, IErrorDetail } from './util';
+export interface ICheckerSuite {
+    [name: string]: Checker;
+}
+/**
+ * Takes one of more type suites (e.g. a module generated by `ts-interface-builder`), and combines
+ * them into a suite of interface checkers. If a type is used by name, that name should be present
+ * among the passed-in type suites.
+ *
+ * The returned object maps type names to Checker objects.
+ */
+export declare function createCheckers(...typeSuite: ITypeSuite[]): ICheckerSuite;
+/**
+ * Checker implements validation of objects, and also includes accessors to validate method calls.
+ * Checkers should be created using `createCheckers()`.
+ */
+export declare class Checker {
+    private suite;
+    private ttype;
+    private _path;
+    private props;
+    private checkerPlain;
+    private checkerStrict;
+    constructor(suite: ITypeSuite, ttype: TType, _path?: string);
+    /**
+     * Set the path to report in errors, instead of the default "value". (E.g. if the Checker is for
+     * a "person" interface, set path to "person" to report e.g. "person.name is not a string".)
+     */
+    setReportedPath(path: string): void;
+    /**
+     * Check that the given value satisfies this checker's type, or throw Error.
+     */
+    check(value: any): void;
+    /**
+     * A fast check for whether or not the given value satisfies this Checker's type. This returns
+     * true or false, does not produce an error message, and is fast both on success and on failure.
+     */
+    test(value: any): boolean;
+    /**
+     * Returns an error object describing the errors if the given value does not satisfy this
+     * Checker's type, or null if it does.
+     */
+    validate(value: any): IErrorDetail | null;
+    /**
+     * Check that the given value satisfies this checker's type strictly. This checks that objects
+     * and tuples have no extra members. Note that this prevents backward compatibility, so usually
+     * a plain check() is more appropriate.
+     */
+    strictCheck(value: any): void;
+    /**
+     * A fast strict check for whether or not the given value satisfies this Checker's type. Returns
+     * true or false, does not produce an error message, and is fast both on success and on failure.
+     */
+    strictTest(value: any): boolean;
+    /**
+     * Returns an error object describing the errors if the given value does not satisfy this
+     * Checker's type strictly, or null if it does.
+     */
+    strictValidate(value: any): IErrorDetail | null;
+    /**
+     * If this checker is for an interface, returns a Checker for the type required for the given
+     * property of this interface.
+     */
+    getProp(prop: string): Checker;
+    /**
+     * If this checker is for an interface, returns a Checker for the argument-list required to call
+     * the given method of this interface. E.g. if this Checker is for the interface:
+     *    interface Foo {
+     *      find(s: string, pos?: number): number;
+     *    }
+     * Then methodArgs("find").check(...) will succeed for ["foo"] and ["foo", 3], but not for [17].
+     */
+    methodArgs(methodName: string): Checker;
+    /**
+     * If this checker is for an interface, returns a Checker for the return value of the given
+     * method of this interface.
+     */
+    methodResult(methodName: string): Checker;
+    /**
+     * If this checker is for a function, returns a Checker for its argument-list.
+     */
+    getArgs(): Checker;
+    /**
+     * If this checker is for a function, returns a Checker for its result.
+     */
+    getResult(): Checker;
+    /**
+     * Return the type for which this is a checker.
+     */
+    getType(): TType;
+    /**
+     * Actual implementation of check() and strictCheck().
+     */
+    private _doCheck;
+    private _doValidate;
+    private _getMethod;
+}
+/**
+ * Typed checker interface. Adds type guard functionality to a normal `Checker`.
+ *
+ * To use, cast a `Checker` to a `CheckerT<>` using the appropriate type.
+ *
+ * eg.
+ *   import { MyInterface } from './my-interface';
+ *   import MyInterfaceTi from './my-interface-ti';
+ *
+ *   const checkers = createCheckers(MyInterfaceTi) as {
+ *     MyInterface: CheckerT<MyInterface>
+ *   };
+ *
+ * TODO:
+ * - Enable `check()` and `strictCheck()` type assertion definitions once the functionality
+ *   is correctly working in TypeScript. (https://github.com/microsoft/TypeScript/issues/36931)
+ */
+export interface CheckerT<T> extends Checker {
+    test(value: any): value is T;
+    strictTest(value: any): value is T;
+}