Get application configuration from spec of required environment variables.
We define environment dependencies and defaults via a spec file:
module.exports = pkg => ({
env: {
redisHost: {
description: 'the Redis host',
default: 'localhost'
},
redisPort: {
description: 'the Redis port',
default: 6379
}
}
}The application index.js passes the spec definition and main (entry-point) function to the application archetype.
require('redis-koa-app')(
require('../package'),
require('./spec'),
async deps => Object.assign(global, deps),
() => require('./main')
).catch(console.error);The application archetype uses this library to parse the config from process.env according to the spec and to invoke the main function.
In the above example, we assign the archetype's dependencies on global before main.js is parsed i.e. including:
const deps = {
assert, clc, lodash, Promise,
asserta, asserto,
DataError, StatusError,
redis, client, logger, config,
multiExecAsync
};