Added Agent.build() and return `app` for use in serverless environments

[nalbion]

Pull Request

Description

Small refactor to createApi() to return app and optionally not start listening. This allows the JavaScript library to be used from serverless functions in AWS, Google etc.

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[jzanecook]

Hey @nalbion I'm trying to run this and I'm running into the following error using the minimal example:

❯ ts-node minimal.ts
Agent listening at http://localhost:8000
Internal Server Error: /response must be object
    at ResponseValidator._validate (/mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/express-openapi-validator/src/middlewares/openapi.response.validator.ts:201:13)
    at /mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/express-openapi-validator/src/middlewares/openapi.response.validator.ts:73:23
    at ServerResponse.json_hook (/mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/express-openapi-validator/src/framework/modded.express.mung.ts:39:16)
    at /mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/agent-protocol/src/agent.ts:100:25
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
task: d49ea465-d956-47fe-9ded-2d2753ef065d
step: Write the word 'Washington' to a .txt file
step: y
task: e650d874-7de7-4236-9c0f-20198e605ece
Internal Server Error: /response must be object
    at ResponseValidator._validate (/mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/express-openapi-validator/src/middlewares/openapi.response.validator.ts:201:13)
    at /mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/express-openapi-validator/src/middlewares/openapi.response.validator.ts:73:23
    at ServerResponse.json_hook (/mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/express-openapi-validator/src/framework/modded.express.mung.ts:39:16)
    at /mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/agent-protocol/src/agent.ts:100:25
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
task: 8c7abfce-7f2f-4ee5-8fc3-d7185ecbc8db
Internal Server Error: /response must be object
    at ResponseValidator._validate (/mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/express-openapi-validator/src/middlewares/openapi.response.validator.ts:201:13)
    at /mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/express-openapi-validator/src/middlewares/openapi.response.validator.ts:73:23
    at ServerResponse.json_hook (/mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/express-openapi-validator/src/framework/modded.express.mung.ts:39:16)
    at /mnt/sda1/home/z/Documents/Projects/RAW/agent-protocol/packages/sdk/js/node_modules/agent-protocol/src/agent.ts:100:25
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
task: 562e4515-78e0-46de-826c-fc5568f14429

Do you think you could merge in some of the new changes to the js sdk and verify that this is an issue on your side as well?

---

Nevermind, I didn't use a local import for the minimal example. This is working.