TypeScript to OpenAPI 3

tsToOpenApi.ts

import * as tsj from "ts-json-schema-generator";
const toOpenApi = require("json-schema-to-openapi-schema");

const defaultConfig: SchemaConfig = {
  tsconfig: "./tsconfig-types.json",
  type: "*",
};

export const generateOpenApiSchema = (
  schemaName: string,
  version = "1.0.0",
  config = defaultConfig
) => {
  const schema = tsj.createGenerator(config).createSchema(config.type);

  const convertedSchema = toOpenApi(schema);

  const openAPI3Schema = {
    openapi: "3.0.0",
    info: {
      version: version,
      title: schemaName,
    },
    paths: {},
    components: {
      schemas: {
        ...convertedSchema.definitions,
      },
    },
  };

  return openAPI3Schema;
};