Imposter TypeScript types

• Code autocompletion for your Imposter JavaScript or TypeScript scripts.
• ES6 and TypeScript support.

Getting started

The types are published as an npm package.

The fastest way to get started is to clone this repository and copy one of the sample projects:

• JavaScript: imposter-sample-javascript
• TypeScript: imposter-sample-typescript

These samples are preconfigured to transpile and bundle source files down to a single JS file. This can be referenced as the scriptFile in your Imposter mock config.

Note: just update the dependency for @imposter-js/types in the package.json to the latest from npmjs.com

In the sample project, bundle your script:

npm run build

In the dist directory you will have two files:

$ ls
bundle.js
mock-config.yaml

This is a valid Imposter configuration - just run imposter up

Install Imposter CLI if you don't already have it.

Start your mock:

$ imposter up
...
Mock server up and running on http://localhost:8080

Hit it:

$ curl http://localhost:8080
{ "name": "Ada Lovelace" }

The name is dynamically chosen from a list by the script.

Also notice the log output in Imposter:

DEBUG ... Executed script 'dist/bundle.js' for request: GET http://localhost:8080/ in 6.34ms

Worked example

This example shows the process in more detail.

Note - this example assumes you know how to set up a bundler/transpiler to emit a single JS file. For a working configuration you can copy see the sample projects.

Prerequisites

• Node.js
• A bundler such as webpack
• Recommended: Install Imposter CLI

Steps

Add the types to your Node.js module as a dev dependency:

npm install @imposter-js/types --save-dev

Import the types in your Imposter scripts:

import {context, logger, respond} from "@imposter-js/types"

Use the objects to write your script, with code autocompletion in your editor/IDE:

logger.info(`Received request: ${context.request}`)

const request = context.request

const body = JSON.stringify({
    "name": "Ada Lovelace",
})

respond()
    .withStatusCode(200)
    .withData(body)

Bundle your script:

npm run build

In the dist directory you will have two files:

$ ls
bundle.js
mock-config.yaml

This is a valid Imposter configuration - just run imposter up

Install Imposter CLI if you don't already have it.

Start your mock:

$ imposter up
...
Mock server up and running on http://localhost:8080

Hit it:

$ curl http://localhost:8080
{ "name": "Ada Lovelace" }

Also notice the log output in Imposter:

DEBUG ... Executed script 'dist/bundle.js' for request: GET http://localhost:8080/ in 6.34ms

Next steps

Because we use a bundler, you can split your scripts across multiple files.

See the src directory of the sample projects for an example.

Related

• Imposter Mock Engine
• Imposter JS