Buildwiz

A flexible and chainable JavaScript library for generating Dockerfiles dynamically. This library helps developers create Dockerfiles programmatically with support for multi-stage builds, environment variables, labels, health checks, and more.

Features

• Multi-Stage Builds: Reduce image size with multiple build stages.
• Environment Variables: Easily define ENV variables.
• Volumes & Labels: Support for VOLUME and LABEL instructions.
• Health Checks: Add HEALTHCHECK instructions to improve container stability.
• Build Arguments: Define ARG variables for flexible builds.
• Chainable API: Improve readability and maintainability.
• Templating Support: Future-proof design with support for templating engines.

Installation

You can install the package via npm:

npm install buildwiz

or via yarn:

yarn add buildwiz

Usage

Basic Example

const DockerfileWiz = require('buildwiz');

const generator = new DockerfileWiz();
generator
    .from('node:18')
    .workdir('/app')
    .copy('.', '/app')
    .run(['npm install'])
    .expose(3000)
    .cmd(['node', 'server.js'])
    .writeToFile('Dockerfile');

Multi-Stage Build Example

const generator = new DockerfileWiz();
generator
    .addStage('builder', 'node:18')
    .workdir('/app')
    .copy('.', '/app')
    .run(['npm install', 'npm run build'])
    .addStage('runtime', 'node:18-alpine')
    .fromStage('runtime')
    .workdir('/app')
    .addCopyFromInstruction('builder', '/app/dist', '/app/dist')
    .expose(3000)
    .setEnv('NODE_ENV', 'production')
    .setHealthcheck('curl -f http://localhost:3000 || exit 1')
    .cmd(['node', 'server.js'])
    .writeToFile('Dockerfile');

API Methods

Dockerfile Instructions

| Method | Description | |--------------------------------|-------------| | from(image) | Sets the base image | | addStage(name, image) | Adds a named stage for multi-stage builds | | fromStage(stageName) | Switches to a different stage | | workdir(path) | Sets the working directory | | copy(src, dest) | Copies files into the container | | addCopyFromInstruction(fromStage, src, dest) | Copies files from a previous build stage | | run(command) | Runs a command in the container | | expose(port) | Exposes a port | | setEnv(key, value) | Defines an environment variable | | setHealthcheck(command, options) | Sets a health check | | setUser(user) | Sets the user | | addVolume(path) | Adds a volume | | addLabel(key, value) | Adds a label | | addBuildArg(name, defaultValue) | Adds a build argument | | addOnbuildInstruction(instruction) | Adds an ONBUILD instruction | | setShell(shellArray) | Sets a custom shell | | cmd(command) | Sets the CMD instruction | | writeToFile(outputPath) | Writes the Dockerfile to the specified location |

Contributing

Contributions are welcome! Feel free to open issues and submit pull requests.

License

Copyright (c) 2025 Omkar Bhosale

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Author

Developed by Omkar Ravindra Bhosale.