Refactor to use private methods

Update the getLayers method to take in an array of the layer filenames you expect to be in the gerber archive. This will allow the package to be used with gerbers that output different filenames for each layer then EAGLE.

.eslintrc.json

@@ -1,11 +0,0 @@
-{
-    "extends": ["airbnb-base", "prettier", "plugin:node/recommended"],
-    "env": {
-        "node": true
-    },
-    "plugins": ["prettier"],
-    "rules": {
-        "prettier/prettier": "error",
-        "no-console": "off"
-    }
-}

.gitignore

@@ -75,22 +75,12 @@ typings/
 # parcel-bundler cache (https://parceljs.org/)
 .cache
 
-# Next.js build output
-.next
-
-# Nuxt.js build / generate output
-.nuxt
-dist
-
 # Gatsby files
 .cache/
 # Comment in the public line in if your project uses Gatsby and *not* Next.js
 # https://nextjs.org/blog/next-9-1#public-directory-support
 # public
 
-# vuepress build output
-.vuepress/dist
-
 # Serverless directories
 .serverless/
 
@@ -106,4 +96,5 @@ dist
 .DS_Store
 gerber/
 hello.txt
-test/tmp/*
+test/tmp/*
+test/arduino/*

README.md

@@ -5,30 +5,91 @@
 **This is still being developed and isn't ready for production!**
 Only tested with gerbers generated by EAGLE.
 
-Requires node version 10 or higher.
+node version 20 or higher recommended.
 
 ## Usage
 
+### Save a PNG file
+
 ```
-const fileProc = require('@nplayfair/npe_gerber');
+const { ImageGenerator } = require('@nplayfair/npe_gerber');
 
 const folderConfig = {
     tmpDir: path.join(__dirname, 'tmp'),
     imgDir: path.join(__dirname, 'img')
 }
 
-const config = {
+const imageConfig = {
     resizeWidth: 600,
     density: 1000,
     compLevel: 1
 }
 
-fileProc.config(folderConfig);
+const layerNames = [
+  'CAMOutputs/DrillFiles/drills.xln',
+  'CAMOutputs/GerberFiles/copper_top.gbr',
+  'CAMOutputs/GerberFiles/silkscreen_top.gbr',
+  'CAMOutputs/GerberFiles/soldermask_top.gbr',
+  'CAMOutputs/GerberFiles/solderpaste_top.gbr',
+  'CAMOutputs/GerberFiles/profile.gbr',
+];
 
-let gerberArchive = '/path/to/gerber.zip';
+const gerberArchive = '/path/to/gerber.zip';
 
-fileProc.gerberToImage(gerberArchive, config, folderConfig.tmpDir, folderConfig.imgDir)
+const fileProc = new ImageGenerator(folderConfig, imageConfig, layerNames);
+
+fileProc.gerberToImage(gerberArchive)
       .then(filename => {
         console.log(`Generated image ${filename}`);
       })
-```
+```
+
+### Return a PNG stream
+
+```
+const { ImageGenerator } = require('@nplayfair/npe_gerber');
+
+const folderConfig = {
+    tmpDir: path.join(__dirname, 'tmp'),
+    imgDir: path.join(__dirname, 'img')
+}
+
+const imageConfig = {
+    resizeWidth: 600,
+    density: 1000,
+    compLevel: 1
+}
+
+const layerNames = [
+  'CAMOutputs/DrillFiles/drills.xln',
+  'CAMOutputs/GerberFiles/copper_top.gbr',
+  'CAMOutputs/GerberFiles/silkscreen_top.gbr',
+  'CAMOutputs/GerberFiles/soldermask_top.gbr',
+  'CAMOutputs/GerberFiles/solderpaste_top.gbr',
+  'CAMOutputs/GerberFiles/profile.gbr',
+];
+
+const gerberArchive = '/path/to/gerber.zip';
+
+const fileProc = new ImageGenerator(folderConfig, imageConfig, layerNames);
+
+fileProc.gerberToStream(gerberArchive)
+      .then(stream => {
+        // Do something with the stream
+      })
+```
+
+## Layer Names
+
+The constructor must be passed an array of filenames that correspond to the layers in the gerber archives you expect to be uploaded. The example above shows which names are used by EAGLE but other applications may use different filenames.
+
+## Image Processing Configuratation
+
+Several values need to be set in the image configuration object. An SVG vector is first created as an intermediate step before being converted to a PNG. These correspond to the parameters passed to [sharp](https://sharp.pixelplumbing.com/) for
+resizing the intermediary SVG and output PNG file. These settings are:
+
+- `resizeWidth`: Width in pixels of the output image.
+- `density`: DPI to create the SVG with. Low values will result in a poor quality output image.
+- `compLevel`: PNG compression level.
+
+More information about these settings can be found in the [sharp](https://sharp.pixelplumbing.com/) documentation.

dist/index.js

@@ -0,0 +1,196 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ImageGenerator = void 0;
+//Modules
+const adm_zip_1 = __importDefault(require("adm-zip"));
+const fs_extra_1 = require("fs-extra");
+const path_1 = __importDefault(require("path"));
+const pcb_stackup_1 = __importDefault(require("pcb-stackup"));
+const sharp_1 = __importDefault(require("sharp"));
+const node_stream_1 = require("node:stream");
+const node_fs_1 = require("node:fs");
+//Class definition
+class ImageGenerator {
+    constructor(folderConfig, imgConfig, layerNames) {
+        this.folderConfig = folderConfig;
+        this.imgConfig = imgConfig;
+        this.layerNames = layerNames;
+        //Ensure folders exist
+        if (!validFolder(folderConfig.tmpDir, true))
+            throw new Error('Temp directory is invalid');
+        if (!validFolder(folderConfig.imgDir, true))
+            throw new Error('Image directory is invalid');
+    }
+    //Layer promise
+    getLayers(dir, layerNames) {
+        //Check correct number of layers and folder exists
+        layerNames.forEach((layerName) => {
+            if (!(0, node_fs_1.existsSync)(path_1.default.join(dir, layerName))) {
+                throw `Missing layer: ${layerName}`;
+            }
+        });
+        if (!(0, node_fs_1.existsSync)(dir)) {
+            throw new Error('Folder not there');
+        }
+        //Return layer promise
+        const layersPromise = new Promise(function (resolve, reject) {
+            const layers = layerNames.map((layerName) => ({
+                filename: layerName,
+                gerber: (0, node_fs_1.createReadStream)(path_1.default.join(dir, layerName)),
+            }));
+            if (layers.length === layerNames.length) {
+                resolve(layers);
+            }
+            else {
+                reject('Invalid layer count');
+            }
+        });
+        return layersPromise;
+    }
+    //Clean up the archive folder in the specified directory
+    static cleanupFiles(dir) {
+        try {
+            const folder = path_1.default.join(dir, 'archive');
+            (0, fs_extra_1.emptyDirSync)(folder);
+        }
+        catch (error) {
+            if (error instanceof Error) {
+                console.error(error.message);
+            }
+        }
+    }
+    //  * Take an archive containing gerber files, config object, temporary dir
+    //  * and output dir and create a PNG image from the gerber in the output dir
+    //  * @param {string} gerber Path to an archive file containing gerber
+    //  * @returns {Promise.<string>} Promise to return path to image
+    gerberToImage(gerber) {
+        // Create output dir if it doesn't exist
+        try {
+            (0, fs_extra_1.ensureDirSync)(this.folderConfig.imgDir);
+        }
+        catch (error) {
+            if (error instanceof Error) {
+                console.error(error.message);
+            }
+        }
+        // Check temp and output dirs exist
+        if (!(0, node_fs_1.existsSync)(gerber)) {
+            throw Error('Archive does not exist.');
+        }
+        if (!(0, node_fs_1.existsSync)(this.folderConfig.tmpDir)) {
+            throw Error('Temporary folder does not exist.');
+        }
+        if (!(0, node_fs_1.existsSync)(this.folderConfig.imgDir)) {
+            throw Error('Output folder does not exist.');
+        }
+        // Set filenames
+        //Use the filename of the gerber zip to determine the output png filename
+        const imageName = path_1.default.basename(gerber, '.zip');
+        const destFile = `${path_1.default.join(this.folderConfig.imgDir, imageName)}.png`;
+        return new Promise((resolve, reject) => {
+            if (!this.layerNames) {
+                throw new Error('You must supply an array of layer names.');
+            }
+            //Extract the passed in zip file
+            extractArchive(gerber, this.folderConfig.tmpDir);
+            this.getLayers(path_1.default.join(this.folderConfig.tmpDir, 'archive'), this.layerNames)
+                .then(pcb_stackup_1.default)
+                .then((stackup) => {
+                (0, sharp_1.default)(Buffer.from(stackup.top.svg), {
+                    density: this.imgConfig.density,
+                })
+                    .resize({ width: this.imgConfig.resizeWidth })
+                    .png({ compressionLevel: this.imgConfig.compLevel })
+                    .toFile(destFile);
+            })
+                .then(() => {
+                ImageGenerator.cleanupFiles(this.folderConfig.tmpDir);
+                resolve(destFile);
+            })
+                .catch((e) => {
+                ImageGenerator.cleanupFiles(this.folderConfig.tmpDir);
+                reject(new Error(e));
+            });
+        });
+    }
+    /**
+     * Take an archive containing gerber files and return a stream containing
+     * a PNG image from the gerber */
+    gerberToStream(gerber) {
+        // Check temp and output dirs exist
+        if (!(0, node_fs_1.existsSync)(gerber)) {
+            throw Error('Archive does not exist.');
+        }
+        if (!(0, node_fs_1.existsSync)(this.folderConfig.tmpDir)) {
+            throw Error('Temporary folder does not exist.');
+        }
+        if (!(0, node_fs_1.existsSync)(this.folderConfig.imgDir)) {
+            throw Error('Output folder does not exist.');
+        }
+        return new Promise((resolve, reject) => {
+            extractArchive(gerber, this.folderConfig.tmpDir);
+            if (!this.layerNames)
+                throw new Error('No layers provided');
+            this.getLayers(path_1.default.join(this.folderConfig.tmpDir, 'archive'), this.layerNames)
+                .then(pcb_stackup_1.default)
+                .then((stackup) => {
+                (0, sharp_1.default)(Buffer.from(stackup.top.svg), {
+                    density: this.imgConfig.density,
+                })
+                    .resize({ width: this.imgConfig.resizeWidth })
+                    .png({ compressionLevel: this.imgConfig.compLevel })
+                    .toBuffer()
+                    .then((buffer) => {
+                    ImageGenerator.cleanupFiles(this.folderConfig.tmpDir);
+                    const stream = new node_stream_1.Readable();
+                    stream.push(buffer);
+                    stream.push(null);
+                    resolve(stream);
+                });
+            })
+                .catch((e) => {
+                ImageGenerator.cleanupFiles(this.folderConfig.tmpDir);
+                reject(new Error(e));
+            });
+        });
+    }
+}
+exports.ImageGenerator = ImageGenerator;
+//File methods
+//Check that a folder exists and is writeable
+function validFolder(dir, checkPerms) {
+    if (!(0, node_fs_1.existsSync)(dir)) {
+        throw Error('Folder does not exist.');
+    }
+    //Check folder permissions, will throw error if not readable or writeable
+    if (checkPerms) {
+        (0, node_fs_1.accessSync)(dir, node_fs_1.constants.R_OK | node_fs_1.constants.W_OK);
+        (0, node_fs_1.accessSync)(dir, node_fs_1.constants.R_OK | node_fs_1.constants.W_OK);
+    }
+    //All checks passed
+    return true;
+}
+function extractArchive(fileName, outputDir) {
+    //Check archive exists
+    if (!(0, node_fs_1.existsSync)(fileName)) {
+        throw Error('Archive does not exist.');
+    }
+    //Check output dir is valid
+    if (!validFolder(outputDir, true))
+        throw new Error('Output directory is not valid');
+    //Attempt to extract archive
+    const zip = new adm_zip_1.default(fileName);
+    try {
+        zip.extractAllTo(path_1.default.join(outputDir, 'archive'));
+    }
+    catch (error) {
+        if (error instanceof Error) {
+            console.error(error.message);
+            return 0;
+        }
+    }
+    return zip.getEntries().length;
+}

eslint.config.mjs

@@ -0,0 +1,18 @@
+// @ts-check
+
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  tseslint.configs.recommended,
+  {
+    ignores: [
+      'dist/**',
+      'test/**',
+      'node_modules/**',
+      'webpack.dev.js',
+      'webpack.prod.js',
+    ],
+  },
+);

index.js

@@ -1,151 +0,0 @@
-const AdmZip = require('adm-zip');
-const fs = require('fs-extra');
-const path = require('path');
-const pcbStackup = require('pcb-stackup');
-const sharp = require('sharp');
-
-// Filenames we need to extract from the archive
-const gerberFiles = [
-  'CAMOutputs/DrillFiles/drills.xln',
-  'CAMOutputs/GerberFiles/copper_top.gbr',
-  'CAMOutputs/GerberFiles/silkscreen_top.gbr',
-  'CAMOutputs/GerberFiles/soldermask_top.gbr',
-  'CAMOutputs/GerberFiles/solderpaste_top.gbr',
-  'CAMOutputs/GerberFiles/profile.gbr',
-];
-
-/**
- * Configures the folders used
- * @param {Object} folderConfig Object with properties tmpDir and imgDir containing paths to temporary and image output folders
- */
-function config(folderConfig) {
-  // Create tmpDir if it does not exist
-  fs.ensureDirSync(folderConfig.tmpDir);
-  // Create imgDir if it does not exist
-  fs.ensureDirSync(folderConfig.imgDir);
-}
-
-/**
- * Handle errors, log to console and return the error object
- * @param {Object} Error object
- * @returns {Object} Error object
- */
-function handleError(e) {
-  // Clean up temp files
-  // cleanupFiles();
-  console.error(e);
-  return e;
-}
-
-/**
- * Extracts the passed in zip file
- * @param {string} fileName Name of the file to be extracted
- * @param {string} tmpDir Temporary directory to extract to
- * @returns {Promise} Promise object represents number of files extracted
- */
-function extractArchive(fileName, tmpDir) {
-  // Check archive exists
-  try {
-    if (!fs.existsSync(fileName)) {
-      throw Error('Archive does not exist.');
-    }
-    if (!fs.existsSync(tmpDir)) {
-      throw Error('Temporary folder does not exist.');
-    }
-  } catch (e) {
-    throw new Error(e);
-  }
-
-  const zip = new AdmZip(fileName);
-  zip.extractAllTo(path.join(tmpDir, 'archive'));
-}
-
-/**
- * Take in a directory of layer files and return an array of the layers files
- * @param {string} dir Directory containing layer files
- * @returns {Array} Array of paths to the layers files
- */
-function getLayers(dir) {
-  return new Promise((resolve, reject) => {
-    // Make sure the directory exists
-    if (!fs.existsSync(dir)) {
-      return reject(new Error('Layers folder does not exist.'));
-    }
-    // Check that the required layer files exist in source dir
-    let layersValid = true;
-    gerberFiles.forEach((layer) => {
-      if (!fs.existsSync(path.join(dir, layer))) layersValid = false;
-    });
-    if (!layersValid) return reject(new Error('Layer not found.'));
-    // Construct array of layers that match the supplied filenames array
-    const layers = gerberFiles.map((layerName) => ({
-      filename: layerName,
-      gerber: fs.createReadStream(path.join(dir, layerName)),
-    }));
-    return resolve(layers);
-  });
-}
-
-/**
- * Clean up the archive folder in the specified directory
- * @param {string} dir Path to a directory to clean up
- */
-function cleanupFiles(dir) {
-  try {
-    const folder = path.join(dir, 'archive');
-    fs.emptyDirSync(folder);
-    console.log('Temp files removed.');
-  } catch (err) {
-    console.error(err);
-  }
-}
-
-/**
- * Take an archive containing gerber files, config object, temporary dir
- * and output dir and create a PNG image from the gerber in the output dir
- * @param {string} gerber Path to an archive file containing gerber
- * @param {Object} config Object containing sharp settings for resizeWidth, compLevel and density
- * @param {string} tmpDir Temporary directory to extract the archive to
- * @param {string} outputDir Directory to save the image to
- */
-function gerberToImage(gerber, imgConfig, tmpDir, outputDir) {
-  // Set filenames
-  const imageName = path.basename(gerber, '.zip');
-  const destFile = `${path.join(outputDir, imageName)}.png`;
-
-  // Make sure output dir exists
-  try {
-    fs.ensureDirSync(outputDir);
-  } catch (e) {
-    console.error(e);
-  }
-
-  return new Promise((resolve, reject) => {
-    extractArchive(gerber, tmpDir);
-    getLayers(path.join(tmpDir, 'archive'))
-      .then(pcbStackup)
-      .then((stackup) => {
-        sharp(Buffer.from(stackup.top.svg), { density: imgConfig.density })
-          .resize({ width: imgConfig.resizeWidth })
-          .png({ compressionLevel: imgConfig.compLevel })
-          .toFile(destFile);
-      })
-      .then(() => {
-        cleanupFiles(tmpDir);
-        resolve(destFile);
-      })
-      .catch((e) => {
-        cleanupFiles(tmpDir);
-        handleError(e);
-        reject(e);
-      });
-  });
-}
-
-module.exports = {
-  cleanupFiles,
-  getLayers,
-  extractArchive,
-  config,
-  gerberToImage,
-};

package.json

@@ -1,10 +1,14 @@
 {
   "name": "@nplayfair/npe_gerber",
-  "version": "0.1.0",
+  "version": "1.0.2",
   "description": "Create a PCB image from gerber files",
-  "main": "index.js",
+  "main": "dist/index.js",
+  "types": "types/npe_gerber.d.ts",
   "scripts": {
-    "test": "jest"
+    "build": "tsc --build",
+    "test": "NODE_ENV=test PORT=7788 jest",
+    "test:watch": "npm run test -- --watchAll",
+    "lint": "eslint ."
   },
   "repository": {
     "type": "git",
@@ -21,23 +25,48 @@
     "image",
     "gerber"
   ],
+  "jest": {
+    "verbose": true,
+    "modulePathIgnorePatterns": [
+      "<rootDir>/node_modules"
+    ],
+    "roots": [
+      "<rootDir>/test"
+    ],
+    "transform": {
+      "^.+\\.tsx?$": "ts-jest"
+    },
+    "testEnvironment": "node",
+    "testPathIgnorePatterns": [
+      "/node_modules"
+    ],
+    "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$",
+    "moduleFileExtensions": [
+      "ts",
+      "tsx",
+      "js",
+      "jsx",
+      "json",
+      "node"
+    ]
+  },
   "dependencies": {
-    "adm-zip": "^0.5.2",
+    "adm-zip": "^0.5.16",
-    "fs-extra": "^9.1.0",
+    "fs-extra": "^11.3.0",
-    "jszip": "^3.5.0",
+    "pcb-stackup": "^4.2.8",
-    "pcb-stackup": "^4.2.5",
+    "sharp": "^0.34.2"
-    "sharp": "^0.27.0"
   },
   "devDependencies": {
-    "eslint": "^7.19.0",
+    "@eslint/js": "^9.29.0",
-    "eslint-config-airbnb-base": "^14.2.1",
+    "@types/adm-zip": "^0.5.7",
-    "eslint-config-node": "^4.1.0",
+    "@types/fs-extra": "^11.0.4",
-    "eslint-config-prettier": "^7.2.0",
+    "@types/jest": "^29.5.14",
-    "eslint-plugin-import": "^2.22.1",
+    "eslint": "^9.29.0",
-    "eslint-plugin-node": "^11.1.0",
+    "jest": "^30.0.0",
-    "eslint-plugin-prettier": "^3.3.1",
+    "prettier": "^3.5.3",
-    "eslint-plugin-react": "^7.22.0",
+    "ts-jest": "^29.4.0",
-    "jest": "^26.6.3",
+    "ts-node": "^10.9.2",
-    "prettier": "^2.2.1"
+    "typescript": "^5.8.3",
+    "typescript-eslint": "^8.34.0"
   }
 }

src/index.ts

@@ -0,0 +1,219 @@
+//Modules
+import AdmZip from 'adm-zip';
+import { emptyDirSync, ensureDirSync } from 'fs-extra';
+import path from 'path';
+import pcbStackup from 'pcb-stackup';
+import sharp from 'sharp';
+import { Readable } from 'node:stream';
+import { existsSync, createReadStream, accessSync, constants } from 'node:fs';
+
+//Class definition
+export class ImageGenerator {
+  constructor(
+    public folderConfig: FolderConfig,
+    public imgConfig: ImageConfig,
+    public layerNames: string[],
+  ) {
+    //Ensure folders exist
+    if (!this.validFolder(folderConfig.tmpDir, true))
+      throw new Error('Temp directory is invalid');
+
+    if (!this.validFolder(folderConfig.imgDir, true))
+      throw new Error('Image directory is invalid');
+  }
+
+  //Take an archive containing gerber files, config object, temporary dir
+  //and output dir and create a PNG image from the gerber in the output dir
+  public gerberToImage(gerber: string) {
+    //Check gerber archive exists
+    if (!existsSync(gerber)) {
+      throw Error('Archive does not exist.');
+    }
+
+    // Create output dir if it doesn't exist
+    try {
+      ensureDirSync(this.folderConfig.imgDir);
+    } catch (error) {
+      if (error instanceof Error) {
+        throw error;
+      }
+    }
+
+    // Set filenames
+    //Use the filename of the gerber zip to determine the output png filename
+    const imageName = path.basename(gerber, '.zip');
+    const destFile = `${path.join(this.folderConfig.imgDir, imageName)}.png`;
+
+    return new Promise((resolve, reject) => {
+      if (!this.layerNames) {
+        reject('You must supply an array of layer names.');
+      }
+      //Extract the passed in zip file
+      this.extractArchive(gerber, this.folderConfig.tmpDir);
+      //Check all layers present
+      this.layerNames.forEach((layerName) => {
+        if (
+          !existsSync(path.join(this.folderConfig.tmpDir, 'archive', layerName))
+        ) {
+          this.cleanupFiles(this.folderConfig.tmpDir);
+          reject(`Missing layer: ${layerName}`);
+        }
+      });
+      this.getLayers(
+        path.join(this.folderConfig.tmpDir, 'archive'),
+        this.layerNames,
+      )
+        .then(pcbStackup)
+        .then((stackup) => {
+          sharp(Buffer.from(stackup.top.svg as ArrayLike<number>), {
+            density: this.imgConfig.density,
+          })
+            .resize({ width: this.imgConfig.resizeWidth })
+            .png({ compressionLevel: this.imgConfig.compLevel })
+            .toFile(destFile);
+        })
+        .then(() => {
+          this.cleanupFiles(this.folderConfig.tmpDir);
+          resolve(destFile);
+        })
+        .catch((e) => {
+          this.cleanupFiles(this.folderConfig.tmpDir);
+          reject(new Error(e));
+        });
+    });
+  }
+
+  /**
+   * Take an archive containing gerber files and return a stream containing
+   * a PNG image from the gerber */
+
+  gerberToStream(gerber: string) {
+    // Check gerber archive exists
+    if (!existsSync(gerber)) {
+      throw Error('Archive does not exist.');
+    }
+
+    return new Promise((resolve, reject) => {
+      this.extractArchive(gerber, this.folderConfig.tmpDir);
+      if (!this.layerNames) throw new Error('No layers provided');
+      //Check all layers present
+      this.layerNames.forEach((layerName) => {
+        if (
+          !existsSync(path.join(this.folderConfig.tmpDir, 'archive', layerName))
+        ) {
+          this.cleanupFiles(this.folderConfig.tmpDir);
+          reject(`Missing layer: ${layerName}`);
+        }
+      });
+      this.getLayers(
+        path.join(this.folderConfig.tmpDir, 'archive'),
+        this.layerNames,
+      )
+        .then(pcbStackup)
+        .then((stackup) => {
+          sharp(Buffer.from(stackup.top.svg as ArrayLike<number>), {
+            density: this.imgConfig.density,
+          })
+            .resize({ width: this.imgConfig.resizeWidth })
+            .png({ compressionLevel: this.imgConfig.compLevel })
+            .toBuffer()
+            .then((buffer) => {
+              this.cleanupFiles(this.folderConfig.tmpDir);
+              const stream = new Readable();
+              stream.push(buffer);
+              stream.push(null);
+              resolve(stream);
+            });
+        })
+        .catch((e) => {
+          this.cleanupFiles(this.folderConfig.tmpDir);
+          reject(new Error(e));
+        });
+    });
+  }
+
+  //Layer methods
+  //Returns promise that resolves to array of Layers
+  private getLayers(dir: string, layerNames: string[]): Promise<Layers[]> {
+    //Check correct number of layers and folder exists
+    // try {
+    //   layerNames.forEach((layerName) => {
+    //     if (!existsSync(path.join(dir, layerName))) {
+    //       this.cleanupFiles(dir);
+    //       throw new Error(`Missing layer: ${layerName}`);
+    //     }
+    //   });
+    // } catch (error: unknown) {
+    //   if (error instanceof Error) {
+    //     {
+    //       console.error(error.message);
+    //     }
+    //   }
+    // }
+
+    //Return layer promise
+    const layersPromise = new Promise<Layers[]>(function (resolve, reject) {
+      const layers: Layers[] = layerNames.map((layerName: string) => ({
+        filename: layerName,
+        gerber: createReadStream(path.join(dir, layerName)),
+      }));
+      if (layers.length === layerNames.length) {
+        resolve(layers);
+      } else {
+        reject(new Error('Invalid layer count'));
+      }
+    });
+    return layersPromise;
+  }
+
+  //File methods
+  //Check that a folder exists and is writeable
+  private validFolder(dir: string, checkPerms?: boolean): boolean {
+    if (!existsSync(dir)) {
+      throw Error('Folder does not exist.');
+    }
+    //Check folder permissions, will throw error if not readable or writeable
+    if (checkPerms) {
+      accessSync(dir, constants.R_OK | constants.W_OK);
+      accessSync(dir, constants.R_OK | constants.W_OK);
+    }
+
+    //All checks passed
+    return true;
+  }
+
+  private extractArchive(fileName: string, outputDir: string): number {
+    //Check archive exists
+    if (!existsSync(fileName)) {
+      throw Error('Archive does not exist.');
+    }
+
+    //Check output dir is valid
+    if (!this.validFolder(outputDir, true))
+      throw new Error('Output directory is not valid');
+
+    //Attempt to extract archive
+    const zip = new AdmZip(fileName);
+    try {
+      zip.extractAllTo(path.join(outputDir, 'archive'));
+    } catch (error: unknown) {
+      if (error instanceof Error) {
+        console.error(error.message);
+        return 0;
+      }
+    }
+    return zip.getEntries().length;
+  }
+
+  //Clean up the archive folder in the specified directory
+  private cleanupFiles(dir: string): void {
+    try {
+      const folder = path.join(dir, 'archive');
+      emptyDirSync(folder);
+    } catch (error: unknown) {
+      if (error instanceof Error) {
+        console.error(error.message);
+      }
+    }
+  }
+}

test/index.test.js

@@ -1,44 +0,0 @@
-/* eslint-disable */ 
-const path = require('path');
-const fs = require('fs-extra');
-const fileProc = require('../index.js');
-
-const testGerber = path.join(__dirname, 'Arduino-Pro-Mini.zip');
-const testLayers = path.join(__dirname, 'layers');
-const emptyFolder = path.join(__dirname, 'layers', 'Empty');
-const tmpDir = path.join(__dirname, 'tmp');
-
-// getLayers
-test('Promise of an array of layers from a given folder', () => {
-  return fileProc.getLayers2(testLayers).then(data => {
-    expect(data).toEqual(
-      expect.arrayContaining([
-        expect.objectContaining({
-          filename: expect.any(String),
-          gerber: expect.any(fs.ReadStream),
-        })
-      ])
-    );
-  });
-});
-
-test('Non-existent folder should reject promise with error', () => {
-  return expect(fileProc.getLayers2('./invalid_folder')).rejects.toThrow('Layers folder does not exist.');
-});
-
-test('Folder with incorrect number of layers should reject promise with error', () => {
-  return expect(fileProc.getLayers2(emptyFolder)).rejects.toThrow('Layer not found.');
-});
-
-// extractArchive
-test('Non-existent archive should throw an error', () => {
-  return expect(fileProc.extractArchive('invalid.zip', tmpDir)).rejects.toThrow(Error);
-});
-
-test('Temp dir not existing should throw an error', () => {
-  return expect(fileProc.extractArchive(testGerber, './invalid_dir')).rejects.toThrow(Error);
-});
-
-test('Should extract archive and resolve with the number of files extracted', () => {
-  return expect(fileProc.extractArchive(testGerber, tmpDir)).resolves.toBe(12);
-});

test/index.test.ts

@@ -0,0 +1,154 @@
+import path from 'path';
+import { readdirSync } from 'node:fs';
+import { emptyDirSync } from 'fs-extra';
+import { Readable } from 'node:stream';
+import { ImageGenerator } from '../src/index';
+
+//Sample data
+const arduinoGerber = path.join(__dirname, 'Arduino-Pro-Mini.zip');
+const incompleteGerber = path.join(__dirname, 'incomplete.zip');
+
+//Correct folder configuration
+const folderConfig = {
+  tmpDir: path.join(__dirname, 'tmp'),
+  imgDir: path.join(__dirname, 'tmp'),
+};
+//Folder configuration with non-existent tmpDir
+const tmpNotExist = {
+  tmpDir: path.join(__dirname, 'InvalidFolderName'),
+  imgDir: path.join(__dirname, 'tmp'),
+};
+//Folder configuration with non-existent imgDir
+const imgNotExist = {
+  tmpDir: path.join(__dirname, 'tmp'),
+  imgDir: path.join(__dirname, 'InvalidFolderName'),
+};
+//Folder configuration with bad permissions on tmpDir
+const tmpBadPerms = {
+  tmpDir: path.join(__dirname, 'badPerms'),
+  imgDir: path.join(__dirname, 'tmp'),
+};
+//Folder configuration with bad permissions on imgDir
+const imgBadPerms = {
+  tmpDir: path.join(__dirname, 'tmp'),
+  imgDir: path.join(__dirname, 'badPerms'),
+};
+//Correct folder configuration
+const arduinoConfig = {
+  tmpDir: path.join(__dirname, 'tmp'),
+  imgDir: path.join(__dirname, 'arduino'),
+};
+
+//Valid image configuration object
+const imgConfig = {
+  resizeWidth: 600,
+  density: 1000,
+  compLevel: 1,
+};
+
+//Valid array of layer names
+const layerNames = [
+  'CAMOutputs/DrillFiles/drills.xln',
+  'CAMOutputs/GerberFiles/copper_top.gbr',
+  'CAMOutputs/GerberFiles/silkscreen_top.gbr',
+  'CAMOutputs/GerberFiles/soldermask_top.gbr',
+  'CAMOutputs/GerberFiles/solderpaste_top.gbr',
+  'CAMOutputs/GerberFiles/profile.gbr',
+];
+
+//===== Tests =====
+
+//Setup
+beforeAll(() => {
+  return emptyDirSync(folderConfig.tmpDir);
+});
+
+// Test constructor
+describe('Creating an ImageGenerator object', () => {
+  const imgGen = new ImageGenerator(folderConfig, imgConfig, layerNames);
+  test('should create a valid object when passed the correct files and configuration', () => {
+    expect(imgGen).toBeInstanceOf(ImageGenerator);
+  });
+  // Image processing configuration
+  test('image width should be 600', () => {
+    expect(imgGen.imgConfig.resizeWidth).toBe(600);
+  });
+  test('image density should be 1000', () => {
+    expect(imgGen.imgConfig.density).toBe(1000);
+  });
+  test('image compression level should be 1', () => {
+    expect(imgGen.imgConfig.compLevel).toBe(1);
+  });
+  test('folders should be the ones specified in the folder config parameter', () => {
+    expect(imgGen.folderConfig.tmpDir).toBe(path.join(__dirname, 'tmp'));
+    expect(imgGen.folderConfig.imgDir).toBe(path.join(__dirname, 'tmp'));
+  });
+  test('Layers should match layerNames sample array', () => {
+    expect(imgGen.layerNames).toBe(layerNames);
+  });
+  afterAll(() => {
+    return emptyDirSync(folderConfig.tmpDir);
+  });
+});
+
+//Test invalid folder configs
+describe('Attempting to create ImageGenerator object with', () => {
+  afterAll(() => {
+    return emptyDirSync(path.join(__dirname, 'tmp'));
+  });
+  test('non-existent temp folder should throw error', () => {
+    expect(() => {
+      const badGen = new ImageGenerator(tmpNotExist, imgConfig, layerNames);
+    }).toThrow();
+  });
+  test('non-existent image folder should throw error', () => {
+    expect(() => {
+      const badGen = new ImageGenerator(imgNotExist, imgConfig, layerNames);
+    }).toThrow();
+  });
+  test('temp folder with bad permissions should throw error', () => {
+    expect(() => {
+      const badGen = new ImageGenerator(tmpBadPerms, imgConfig, layerNames);
+    }).toThrow();
+  });
+  test('image folder with bad permissions should throw error', () => {
+    expect(() => {
+      const badGen = new ImageGenerator(imgBadPerms, imgConfig, layerNames);
+    }).toThrow();
+  });
+});
+
+//Create image from Arduino Gerber
+describe('Create image from Arduino gerber', () => {
+  beforeAll(() => {
+    return emptyDirSync(path.join(__dirname, 'arduino'));
+  });
+  beforeEach(() => {
+    return emptyDirSync(folderConfig.tmpDir);
+  });
+  const arduinoGen = new ImageGenerator(arduinoConfig, imgConfig, layerNames);
+  test('should create a valid object when passed the correct files and configuration', () => {
+    expect(arduinoGen).toBeInstanceOf(ImageGenerator);
+  });
+  test('invalid archive file should throw an error', () => {
+    expect(() => arduinoGen.gerberToImage('invalid.zip')).toThrow();
+  });
+  test('arduino archive should resolve promise and return a filename of an image', () => {
+    expect.assertions(1);
+    return expect(arduinoGen.gerberToImage(arduinoGerber)).resolves.toEqual(
+      expect.stringContaining('Arduino-Pro-Mini.png'),
+    );
+  });
+  test('arduino archive should resolve promise and return a png stream', () => {
+    expect.assertions(1);
+    return expect(
+      arduinoGen.gerberToStream(arduinoGerber),
+    ).resolves.toBeInstanceOf(Readable);
+  });
+  test('incomplete archive file should throw an error', () => {
+    expect.assertions(1);
+    return expect(arduinoGen.gerberToImage(incompleteGerber)).rejects.toContain(
+      'Missing',
+    );
+  });
+});

test/layers/CAMOutputs/DrillFiles/drills.xln

@@ -1,77 +0,0 @@
-M48
-;GenerationSoftware,Autodesk,EAGLE,9.6.2*%
-;CreationDate,2021-02-01T16:14:31Z*%
-FMAT,2
-ICI,OFF
-METRIC,TZ,000.000
-T2C0.508
-T1C1.016
-%
-G90
-M71
-T1
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-X5105Y29286
-X8890Y2667
-X9652Y14478
-X11430Y12700
-M30

test/layers/CAMOutputs/GerberFiles/Other.gbr

@@ -1,44 +0,0 @@
-G04 EAGLE Gerber RS-274X export*
-G75*
-%MOMM*%
-%FSLAX34Y34*%
-%LPD*%
-%INVias*%
-%IPPOS*%
-%AMOC8*
-5,1,8,0,0,1.08239X$1,22.5*%
-G01*
-%ADD10C,1.016000*%
-
-
-D10*
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-X121920Y139700D03*
-M02*

test/layers/CAMOutputs/GerberFiles/gerber_job.gbrjob

@@ -1,24 +0,0 @@
-{
-    "Header": {
-        "Comment": "All values are metric (mm)",
-        "CreationDate": "2021-02-01T16:14:31Z",
-        "GenerationSoftware": {
-            "Application": "EAGLE",
-            "Vendor": "Autodesk",
-            "Version": "9.6.2"
-        },
-        "Part": "Single"
-    },
-    "Overall": {
-        "BoardThickness": 1.57,
-        "LayerNumber": 2,
-        "Name": {
-            "ProjectId": "Arduino-Pro-Mini"
-        },
-        "Owner": "nick nick <nick@chaosemerald.co.uk>",
-        "Size": {
-            "X": 17.78,
-            "Y": 33.02
-        }
-    }
-}

test/layers/CAMOutputs/GerberFiles/profile.gbr

@@ -1,20 +0,0 @@
-G04 EAGLE Gerber RS-274X export*
-G75*
-%MOMM*%
-%FSLAX34Y34*%
-%LPD*%
-%IN*%
-%IPPOS*%
-%AMOC8*
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-G01*
-%ADD10C,0.254000*%
-
-
-D10*
-X0Y0D02*
-X177800Y0D01*
-X177800Y330200D01*
-X0Y330200D01*
-X0Y0D01*
-M02*

test/layers/CAMOutputs/GerberFiles/soldermask_bottom.gbr

@@ -1,56 +0,0 @@
-G04 EAGLE Gerber RS-274X export*
-G75*
-%MOMM*%
-%FSLAX34Y34*%
-%LPD*%
-%INSoldermask Bottom*%
-%IPPOS*%
-%AMOC8*
-5,1,8,0,0,1.08239X$1,22.5*%
-G01*
-%ADD10C,2.082800*%
-%ADD11R,1.203200X1.303200*%
-
-
-D10*
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test/layers/CAMOutputs/GerberFiles/soldermask_top.gbr

@@ -1,376 +0,0 @@
-G04 EAGLE Gerber RS-274X export*
-G75*
-%MOMM*%
-%FSLAX34Y34*%
-%LPD*%
-%INSoldermask Top*%
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-%ADD20R,1.727200X0.965200*%
-%ADD21C,0.653200*%
-%ADD22R,1.534159X3.495041*%
-
-
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test/layers/CAMOutputs/GerberFiles/solderpaste_bottom.gbr

@@ -1,19 +0,0 @@
-G04 EAGLE Gerber RS-274X export*
-G75*
-%MOMM*%
-%FSLAX34Y34*%
-%LPD*%
-%INSolderpaste Bottom*%
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-%AMOC8*
-5,1,8,0,0,1.08239X$1,22.5*%
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-
-D10*
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test/layers/CAMOutputs/GerberFiles/solderpaste_top.gbr

@@ -1,341 +0,0 @@
-G04 EAGLE Gerber RS-274X export*
-G75*
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-%LPD*%
-%INSolderpaste Top*%
-%IPPOS*%
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tsconfig.json

@@ -0,0 +1,115 @@
+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig to read more about this file */
+
+    /* Projects */
+    // "incremental": true,                              /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
+    // "composite": true,                                /* Enable constraints that allow a TypeScript project to be used with project references. */
+    // "tsBuildInfoFile": "./.tsbuildinfo",              /* Specify the path to .tsbuildinfo incremental compilation file. */
+    // "disableSourceOfProjectReferenceRedirect": true,  /* Disable preferring source files instead of declaration files when referencing composite projects. */
+    // "disableSolutionSearching": true,                 /* Opt a project out of multi-project reference checking when editing. */
+    // "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */
+
+    /* Language and Environment */
+    "target": "es2016" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
+    // "lib": [],                                        /* Specify a set of bundled library declaration files that describe the target runtime environment. */
+    // "jsx": "preserve",                                /* Specify what JSX code is generated. */
+    // "libReplacement": true,                           /* Enable lib replacement. */
+    // "experimentalDecorators": true,                   /* Enable experimental support for legacy experimental decorators. */
+    // "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */
+    // "jsxFactory": "",                                 /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
+    // "jsxFragmentFactory": "",                         /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
+    // "jsxImportSource": "",                            /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
+    // "reactNamespace": "",                             /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
+    // "noLib": true,                                    /* Disable including any library files, including the default lib.d.ts. */
+    // "useDefineForClassFields": true,                  /* Emit ECMAScript-standard-compliant class fields. */
+    // "moduleDetection": "auto",                        /* Control what method is used to detect module-format JS files. */
+
+    /* Modules */
+    "module": "commonjs" /* Specify what module code is generated. */,
+    // "rootDir": "./",                                  /* Specify the root folder within your source files. */
+    // "moduleResolution": "node10",                     /* Specify how TypeScript looks up a file from a given module specifier. */
+    // "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
+    // "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
+    // "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */
+    // "typeRoots": [],                                  /* Specify multiple folders that act like './node_modules/@types'. */
+    // "types": [],                                      /* Specify type package names to be included without being referenced in a source file. */
+    // "allowUmdGlobalAccess": true,                     /* Allow accessing UMD globals from modules. */
+    // "moduleSuffixes": [],                             /* List of file name suffixes to search when resolving a module. */
+    // "allowImportingTsExtensions": true,               /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */
+    // "rewriteRelativeImportExtensions": true,          /* Rewrite '.ts', '.tsx', '.mts', and '.cts' file extensions in relative import paths to their JavaScript equivalent in output files. */
+    // "resolvePackageJsonExports": true,                /* Use the package.json 'exports' field when resolving package imports. */
+    // "resolvePackageJsonImports": true,                /* Use the package.json 'imports' field when resolving imports. */
+    // "customConditions": [],                           /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */
+    // "noUncheckedSideEffectImports": true,             /* Check side effect imports. */
+    // "resolveJsonModule": true,                        /* Enable importing .json files. */
+    // "allowArbitraryExtensions": true,                 /* Enable importing files with any extension, provided a declaration file is present. */
+    // "noResolve": true,                                /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
+
+    /* JavaScript Support */
+    // "allowJs": true,                                  /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
+    // "checkJs": true,                                  /* Enable error reporting in type-checked JavaScript files. */
+    // "maxNodeModuleJsDepth": 1,                        /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
+
+    /* Emit */
+    // "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
+    // "declarationMap": true,                           /* Create sourcemaps for d.ts files. */
+    // "emitDeclarationOnly": true,                      /* Only output d.ts files and not JavaScript files. */
+    // "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
+    // "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */
+    // "noEmit": true,                                   /* Disable emitting files from a compilation. */
+    // "outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
+    "outDir": "./dist" /* Specify an output folder for all emitted files. */,
+    // "removeComments": true,                           /* Disable emitting comments. */
+    // "importHelpers": true,                            /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
+    // "downlevelIteration": true,                       /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
+    // "sourceRoot": "",                                 /* Specify the root path for debuggers to find the reference source code. */
+    // "mapRoot": "",                                    /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSources": true,                            /* Include source code in the sourcemaps inside the emitted JavaScript. */
+    // "emitBOM": true,                                  /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
+    // "newLine": "crlf",                                /* Set the newline character for emitting files. */
+    // "stripInternal": true,                            /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
+    // "noEmitHelpers": true,                            /* Disable generating custom helper functions like '__extends' in compiled output. */
+    // "noEmitOnError": true,                            /* Disable emitting files if any type checking errors are reported. */
+    // "preserveConstEnums": true,                       /* Disable erasing 'const enum' declarations in generated code. */
+    // "declarationDir": "./",                           /* Specify the output directory for generated declaration files. */
+
+    /* Interop Constraints */
+    // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
+    // "verbatimModuleSyntax": true,                     /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */
+    // "isolatedDeclarations": true,                     /* Require sufficient annotation on exports so other tools can trivially generate declaration files. */
+    // "erasableSyntaxOnly": true,                       /* Do not allow runtime constructs that are not part of ECMAScript. */
+    // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
+    "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */,
+    // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
+    "forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,
+
+    /* Type Checking */
+    "strict": true /* Enable all strict type-checking options. */,
+    // "noImplicitAny": true,                            /* Enable error reporting for expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,                         /* When type checking, take into account 'null' and 'undefined'. */
+    // "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
+    // "strictBindCallApply": true,                      /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
+    // "strictPropertyInitialization": true,             /* Check for class properties that are declared but not set in the constructor. */
+    // "strictBuiltinIteratorReturn": true,              /* Built-in iterators are instantiated with a 'TReturn' type of 'undefined' instead of 'any'. */
+    // "noImplicitThis": true,                           /* Enable error reporting when 'this' is given the type 'any'. */
+    // "useUnknownInCatchVariables": true,               /* Default catch clause variables as 'unknown' instead of 'any'. */
+    // "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
+    // "noUnusedLocals": true,                           /* Enable error reporting when local variables aren't read. */
+    // "noUnusedParameters": true,                       /* Raise an error when a function parameter isn't read. */
+    // "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
+    // "noImplicitReturns": true,                        /* Enable error reporting for codepaths that do not explicitly return in a function. */
+    // "noFallthroughCasesInSwitch": true,               /* Enable error reporting for fallthrough cases in switch statements. */
+    // "noUncheckedIndexedAccess": true,                 /* Add 'undefined' to a type when accessed using an index. */
+    // "noImplicitOverride": true,                       /* Ensure overriding members in derived classes are marked with an override modifier. */
+    // "noPropertyAccessFromIndexSignature": true,       /* Enforces using indexed accessors for keys declared using an indexed type. */
+    // "allowUnusedLabels": true,                        /* Disable error reporting for unused labels. */
+    // "allowUnreachableCode": true,                     /* Disable error reporting for unreachable code. */
+
+    /* Completeness */
+    // "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */
+    "skipLibCheck": true /* Skip type checking all .d.ts files. */
+  },
+  "include": ["src/**/*", "types/npe_gerber.d.ts"],
+  "exclude": ["node_modules", "dist/**/*", "test/**/*"]
+}

types/npe_gerber.d.ts

@@ -0,0 +1,23 @@
+interface ImageConfig {
+  resizeWidth: number;
+  density: number;
+  compLevel: number;
+}
+
+interface FolderConfig {
+  tmpDir: string;
+  imgDir: string;
+}
+
+interface ZipExtractor {
+  extractArchive(fileName: string, tmpDir: string): number;
+}
+
+interface Layers {
+  filename: string;
+  gerber: ReadStream;
+}
+
+interface LayerGenerator {
+  getLayers(dir: string, layerNames: string[]): Promise<Layers[]>;
+}