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yaml-boost

v3.0.0

Published

Yaml Parser with additional functionality.

Downloads

15,736

Readme

Yaml-Boost

Build Status Test Coverage Dependabot Status Dependencies NPM Downloads Semantic-Release Gardener

Basic Yaml Loading with additional functionality, i.e. resolve file depedencies, resolve variables, deep merge hierachies.

Useful for loading improved serverless configuration. For yaml loading this package uses js-yaml.

Getting Started

$ npm install --save yaml-boost

Api

resolve(refPath, content, vars)

Resolve content with variables at given refPath.

async load(filePath, vars = {})

Load filePath with given variables.

Note that this function is asynchronous.

dump

As provided by js-yaml through safeDump

Usage

import { load } from 'yaml-boost';

load('config.yaml');

Matching yaml.dump() function is also available.

Variable and File Resolution

Works identical to how this is defined for serverless here.

Both yml and yaml file endings are supported.

Extensions

Bake variables when loading files
${file(./path/to/file.yml), key1=value1&key2=value2}
Reference Packages

You can reference packages by using

${require(PACKAGE):path.to.key.in.module}
Reference Js files

Reference js instead of yaml files.

${file(./path/to/file.js)}

The reference file needs to export simple object containing configuration

export default {};
Reference Function inside Js file

Reference function inside js file.

${fileFn(./path/to/file.js)}

The reference file needs to export simple function returning an object. Available variables are passed in.

export default (args) => ({ args });
Relative File References

Once can reference files relative to the current file by using ^ as a prefix like so

${file(^/subfolder/of/current/file.yml)}
Deep Merge

Analogue to the << yaml syntax we can use <<< to deep merge into the current nesting level. This is helpful when merging files into already existing hierarchies.

Example:

data:
  - list entry one

<<<:
  - data:
      - list entry two
  - other: things

results in

data:
  - list entry one
  - list entry two
other: things

Serverless Example

Define serverless.js as

import path from 'path';
import minimist from 'minimist';
import { load } from 'yaml-boost';

const cfg = await load(path.join(__dirname, 'serverless.core.yml'), minimist(process.argv.slice(2)));
export default cfg;

Then instead of defining serverless.yml, define your config in serverless.core.yml.