JSONSchema to validate env

JSONSchema to valid env

import Ajv from 'ajv'
import { JSONSchema7 } from 'json-schema'

const ajv = new Ajv({ allErrors: true })

const envSchema: JSONSchema7 = {
    type: 'object',
    required: ['SERVICE_NAME', 'ENVIRONMENT', 'LAUNCH_DARKLY_SDK_KEY'],
    properties: {
        SERVICE_NAME: { type: 'string' },
        ENVIRONMENT: { type: 'string' },
        LAUNCH_DARKLY_SDK_KEY: { type: 'string' }
    }
}

const isValid = ajv.compile(envSchema)

export default function getEnvFromProcess(
    proc = process,
    cons = console
) {
    if (!isValid(proc.env)) {
        // tslint:disable-next-line: no-console
        cons.error(ajv.errorsText(
            isValid.errors,
            { dataVar: 'process.env' }
        ))
        proc.exit(0)
    }

    return {
        SERVICE_NAME: proc.env.SERVICE_NAME as string,
        ENVIRONMENT: proc.env.ENVIRONMENT as string,
        LAUNCH_DARKLY_SDK_KEY: proc.env.LAUNCH_DARKLY_SDK_KEY as string
    }
}