@serverless/template

Template

This component is used behind the scenes to deploy your YAML templates. It is loaded by the serverless CLI and executed just as any other component. However, there's a lot you can do with this component programmatically. See the sections below for some examples.

Programmatic usage and custom environments

To deploy to multiple environments you must utilize the programmatic API, via serverless.js file.

serverless.js

const { Component } = require('@serverless/core')

class Deploy extends Component {
  async default(inputs = {}) {
    const { env } = inputs

    const template = await this.load('@serverless/template', env)
    return await template({ template: __dirname + '/serverless.yml' })
  }

  async remove(inputs = {}) {
    const { env } = inputs

    const template = await this.load('@serverless/template', env)
    await template.remove(inputs)
  }
}

module.exports = Deploy

serverless.yml

name: test

lambda:
  component: '@serverless/function'
  inputs:
    name: my-function
    description: My Serverless Function
    memory: 128
    timeout: 20
    code: './code'
    hanlder": 'handler.handler'
    region: us-east-1
    runtime: nodejs10.x

Invoking sls --env=dev will result in state files in .serverless/ being prefixed with the value of your env: Deploy.dev.json, etc. That way you can deploy unlimited environments, add pre/post processing, load whatever .env you need, etc.

Running custom methods on a template

A template itself does not contain any methods so custom methods are executed on the specific template aliases.

sls install --component lambda will load the lambda alias from your template, instantiate the corresponding component, and execute the install method passing in the inputs you specify via CLI parameters. Inputs from the template itself are not passed as they can not be interpreted/resolved without running the entire template.

You can pass as many --component parameters as you need.

Running custom methods programmatically

serverless.js

const { Component } = require('@serverless/core')

class Deploy extends Component {
  /* ...skipped default method for brevity ... */

  async install(inputs = {}) {
    const template = await this.load('@serverless/template')
    await template.install({ template: __dirname + '/serverless.yml', ...inputs })
  }
}

module.exports = Deploy

When invoking methods on a template instance, you always need to pass in a path to the template file or a template object.

Running sls install --component lambda --debug - this will load the template, find the lambda alias, and invoke the install method on the instance of the component.

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