First skeleton

lib/src/parser/aasParser.ts

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+import type { types } from "@aas-core-works/aas-core3.0rc02-typescript";
+
+type AASParsingType = types.Environment | types.AssetAdministrationShell | types.Submodel;
+
+export interface Parser<T extends AASParsingType> {
+    parse(): T | T[];
+}

lib/src/parser/helper.ts

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+import { readdir, readFile } from "fs/promises";
+
+export async function getAllAASFiles(aasPath: string): Promise<string[]> {
+    const files = await readdir(aasPath);
+    return files.filter(file => file.endsWith(".json")).map(file => `${aasPath}/${file}`);
+}
+
+export async function getAASFileContent(aasPath: string): Promise<string> {
+    const content = await readFile(aasPath, { encoding: "utf-8" });
+    return content;
+}
+
+export async function getAllAASFileContents(aasPath: string): Promise<string[]> {
+    const files = await getAllAASFiles(aasPath)
+    const content = [];
+    for (const file of files) {
+        content.push(await getAASFileContent(file));
+    }
+
+    return content;
+}

lib/src/parser/requestParser.ts

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+import type { types } from "@aas-core-works/aas-core3.0rc02-typescript";
+
+type AASRequestType = types.Environment | types.Submodel;
+type AASResponseType = types.BasicEventElement | types.ValueList;
+
+interface RequestTransformer<T extends AASRequestType, U> {
+    transform(request: T): U;
+}
+
+interface NorthboundResponseTransformer<T, U extends AASResponseType> {
+    transform(response: T): U;
+}