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# Config Array
by [Nicholas C. Zakas](https://humanwhocodes.com)
If you find this useful, please consider supporting my work with a [donation](https://humanwhocodes.com/donate).
## Description
A config array is a way of managing configurations that are based on glob pattern matching of filenames. Each config array contains the information needed to determine the correct configuration for any file based on the filename.
## Background
In 2019, I submitted an [ESLint RFC](https://github.com/eslint/rfcs/pull/9) proposing a new way of configuring ESLint. The goal was to streamline what had become an increasingly complicated configuration process. Over several iterations, this proposal was eventually born.
The basic idea is that all configuration, including overrides, can be represented by a single array where each item in the array is a config object. Config objects appearing later in the array override config objects appearing earlier in the array. You can calculate a config for a given file by traversing all config objects in the array to find the ones that match the filename. Matching is done by specifying glob patterns in `files` and `ignores` properties on each config object. Here's an example:
```js
export default [
// match all JSON files
{
name: "JSON Handler",
files: ["**/*.json"],
handler: jsonHandler
},
// match only package.json
{
name: "package.json Handler",
files: ["package.json"],
handler: packageJsonHandler
}
];
```
In this example, there are two config objects: the first matches all JSON files in all directories and the second matches just `package.json` in the base path directory (all the globs are evaluated as relative to a base path that can be specified). When you retrieve a configuration for `foo.json`, only the first config object matches so `handler` is equal to `jsonHandler`; when you retrieve a configuration for `package.json`, `handler` is equal to `packageJsonHandler` (because both config objects match, the second one wins).
## Installation
You can install the package using npm or Yarn:
```bash
npm install @humanwhocodes/config-array --save
# or
yarn add @humanwhocodes/config-array
```
## Usage
First, import the `ConfigArray` constructor:
```js
import { ConfigArray } from "@humanwhocodes/config-array";
// or using CommonJS
const { ConfigArray } = require("@humanwhocodes/config-array");
```
When you create a new instance of `ConfigArray`, you must pass in two arguments: an array of configs and an options object. The array of configs is most likely read in from a configuration file, so here's a typical example:
```js
const configFilename = path.resolve(process.cwd(), "my.config.js");
const { default: rawConfigs } = await import(configFilename);
const configs = new ConfigArray(rawConfigs, {
// the path to match filenames from
basePath: process.cwd(),
// additional items in each config
schema: mySchema
});
```
This example reads in an object or array from `my.config.js` and passes it into the `ConfigArray` constructor as the first argument. The second argument is an object specifying the `basePath` (the directory in which `my.config.js` is found) and a `schema` to define the additional properties of a config object beyond `files`, `ignores`, and `name`.
### Specifying a Schema
The `schema` option is required for you to use additional properties in config objects. The schema is an object that follows the format of an [`ObjectSchema`](https://npmjs.com/package/@humanwhocodes/object-schema). The schema specifies both validation and merge rules that the `ConfigArray` instance needs to combine configs when there are multiple matches. Here's an example:
```js
const configFilename = path.resolve(process.cwd(), "my.config.js");
const { default: rawConfigs } = await import(configFilename);
const mySchema = {
// define the handler key in configs
handler: {
required: true,
merge(a, b) {
if (!b) return a;
if (!a) return b;
},
validate(value) {
if (typeof value !== "function") {
throw new TypeError("Function expected.");
}
}
}
};
const configs = new ConfigArray(rawConfigs, {
// the path to match filenames from
basePath: process.cwd(),
// additional item schemas in each config
schema: mySchema,
// additional config types supported (default: [])
extraConfigTypes: ["array", "function"];
});
```
### Config Arrays
Config arrays can be multidimensional, so it's possible for a config array to contain another config array when `extraConfigTypes` contains `"array"`, such as:
```js
export default [
// JS config
{
files: ["**/*.js"],
handler: jsHandler
},
// JSON configs
[
// match all JSON files
{
name: "JSON Handler",
files: ["**/*.json"],
handler: jsonHandler
},
// match only package.json
{
name: "package.json Handler",
files: ["package.json"],
handler: packageJsonHandler
}
],
// filename must match function
{
files: [ filePath => filePath.endsWith(".md") ],
handler: markdownHandler
},
// filename must match all patterns in subarray
{
files: [ ["*.test.*", "*.js"] ],
handler: jsTestHandler
},
// filename must not match patterns beginning with !
{
name: "Non-JS files",
files: ["!*.js"],
settings: {
js: false
}
}
];
```
In this example, the array contains both config objects and a config array. When a config array is normalized (see details below), it is flattened so only config objects remain. However, the order of evaluation remains the same.
If the `files` array contains a function, then that function is called with the absolute path of the file and is expected to return `true` if there is a match and `false` if not. (The `ignores` array can also contain functions.)
If the `files` array contains an item that is an array of strings and functions, then all patterns must match in order for the config to match. In the preceding examples, both `*.test.*` and `*.js` must match in order for the config object to be used.
If a pattern in the files array begins with `!` then it excludes that pattern. In the preceding example, any filename that doesn't end with `.js` will automatically get a `settings.js` property set to `false`.
You can also specify an `ignores` key that will force files matching those patterns to not be included. If the `ignores` key is in a config object without any other keys, then those ignores will always be applied; otherwise those ignores act as exclusions. Here's an example:
```js
export default [
// Always ignored
{
ignores: ["**/.git/**", "**/node_modules/**"]
},
// .eslintrc.js file is ignored only when .js file matches
{
files: ["**/*.js"],
ignores: [".eslintrc.js"]
handler: jsHandler
}
];
```
You can use negated patterns in `ignores` to exclude a file that was already ignored, such as:
```js
export default [
// Ignore all JSON files except tsconfig.json
{
files: ["**/*"],
ignores: ["**/*.json", "!tsconfig.json"]
},
];
```
### Config Functions
Config arrays can also include config functions when `extraConfigTypes` contains `"function"`. A config function accepts a single parameter, `context` (defined by you), and must return either a config object or a config array (it cannot return another function). Config functions allow end users to execute code in the creation of appropriate config objects. Here's an example:
```js
export default [
// JS config
{
files: ["**/*.js"],
handler: jsHandler
},
// JSON configs
function (context) {
return [
// match all JSON files
{
name: context.name + " JSON Handler",
files: ["**/*.json"],
handler: jsonHandler
},
// match only package.json
{
name: context.name + " package.json Handler",
files: ["package.json"],
handler: packageJsonHandler
}
];
}
];
```
When a config array is normalized, each function is executed and replaced in the config array with the return value.
**Note:** Config functions can also be async.
### Normalizing Config Arrays
Once a config array has been created and loaded with all of the raw config data, it must be normalized before it can be used. The normalization process goes through and flattens the config array as well as executing all config functions to get their final values.
To normalize a config array, call the `normalize()` method and pass in a context object:
```js
await configs.normalize({
name: "MyApp"
});
```
The `normalize()` method returns a promise, so be sure to use the `await` operator. The config array instance is normalized in-place, so you don't need to create a new variable.
If you want to disallow async config functions, you can call `normalizeSync()` instead. This method is completely synchronous and does not require using the `await` operator as it does not return a promise:
```js
await configs.normalizeSync({
name: "MyApp"
});
```
**Important:** Once a `ConfigArray` is normalized, it cannot be changed further. You can, however, create a new `ConfigArray` and pass in the normalized instance to create an unnormalized copy.
### Getting Config for a File
To get the config for a file, use the `getConfig()` method on a normalized config array and pass in the filename to get a config for:
```js
// pass in absolute filename
const fileConfig = configs.getConfig(path.resolve(process.cwd(), "package.json"));
```
The config array always returns an object, even if there are no configs matching the given filename. You can then inspect the returned config object to determine how to proceed.
A few things to keep in mind:
* You must pass in the absolute filename to get a config for.
* The returned config object never has `files`, `ignores`, or `name` properties; the only properties on the object will be the other configuration options specified.
* The config array caches configs, so subsequent calls to `getConfig()` with the same filename will return in a fast lookup rather than another calculation.
* A config will only be generated if the filename matches an entry in a `files` key. A config will not be generated without matching a `files` key (configs without a `files` key are only applied when another config with a `files` key is applied; configs without `files` are never applied on their own). Any config with a `files` key entry ending with `/**` or `/*` will only be applied if another entry in the same `files` key matches or another config matches.
## Determining Ignored Paths
You can determine if a file is ignored by using the `isFileIgnored()` method and passing in the absolute path of any file, as in this example:
```js
const ignored = configs.isFileIgnored('/foo/bar/baz.txt');
```
A file is considered ignored if any of the following is true:
* **It's parent directory is ignored.** For example, if `foo` is in `ignores`, then `foo/a.js` is considered ignored.
* **It has an ancestor directory that is ignored.** For example, if `foo` is in `ignores`, then `foo/baz/a.js` is considered ignored.
* **It matches an ignored file pattern.** For example, if `**/a.js` is in `ignores`, then `foo/a.js` and `foo/baz/a.js` are considered ignored.
* **If it matches an entry in `files` and also in `ignores`.** For example, if `**/*.js` is in `files` and `**/a.js` is in `ignores`, then `foo/a.js` and `foo/baz/a.js` are considered ignored.
* **The file is outside the `basePath`.** If the `basePath` is `/usr/me`, then `/foo/a.js` is considered ignored.
For directories, use the `isDirectoryIgnored()` method and pass in the absolute path of any directory, as in this example:
```js
const ignored = configs.isDirectoryIgnored('/foo/bar/');
```
A directory is considered ignored if any of the following is true:
* **It's parent directory is ignored.** For example, if `foo` is in `ignores`, then `foo/baz` is considered ignored.
* **It has an ancestor directory that is ignored.** For example, if `foo` is in `ignores`, then `foo/bar/baz/a.js` is considered ignored.
* **It matches and ignored file pattern.** For example, if `**/a.js` is in `ignores`, then `foo/a.js` and `foo/baz/a.js` are considered ignored.
* **If it matches an entry in `files` and also in `ignores`.** For example, if `**/*.js` is in `files` and `**/a.js` is in `ignores`, then `foo/a.js` and `foo/baz/a.js` are considered ignored.
* **The file is outside the `basePath`.** If the `basePath` is `/usr/me`, then `/foo/a.js` is considered ignored.
**Important:** A pattern such as `foo/**` means that `foo` and `foo/` are *not* ignored whereas `foo/bar` is ignored. If you want to ignore `foo` and all of its subdirectories, use the pattern `foo` or `foo/` in `ignores`.
## Caching Mechanisms
Each `ConfigArray` aggressively caches configuration objects to avoid unnecessary work. This caching occurs in two ways:
1. **File-based Caching.** For each filename that is passed into a method, the resulting config is cached against that filename so you're always guaranteed to get the same object returned from `getConfig()` whenever you pass the same filename in.
2. **Index-based Caching.** Whenever a config is calculated, the config elements that were used to create the config are also cached. So if a given filename matches elements 1, 5, and 7, the resulting config is cached with a key of `1,5,7`. That way, if another file is passed that matches the same config elements, the result is already known and doesn't have to be recalculated. That means two files that match all the same elements will return the same config from `getConfig()`.
## Acknowledgements
The design of this project was influenced by feedback on the ESLint RFC, and incorporates ideas from:
* Teddy Katz (@not-an-aardvark)
* Toru Nagashima (@mysticatea)
* Kai Cataldo (@kaicataldo)
## License
Apache 2.0

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{
"name": "@humanwhocodes/config-array",
"version": "0.13.0",
"description": "Glob-based configuration matching.",
"author": "Nicholas C. Zakas",
"main": "api.js",
"files": [
"api.js",
"LICENSE",
"README.md"
],
"repository": {
"type": "git",
"url": "git+https://github.com/humanwhocodes/config-array.git"
},
"bugs": {
"url": "https://github.com/humanwhocodes/config-array/issues"
},
"homepage": "https://github.com/humanwhocodes/config-array#readme",
"scripts": {
"build": "rollup -c",
"format": "nitpik",
"lint": "eslint *.config.js src/*.js tests/*.js",
"lint:fix": "eslint --fix *.config.js src/*.js tests/*.js",
"prepublish": "npm run build",
"test:coverage": "nyc --include src/*.js npm run test",
"test": "mocha -r esm tests/ --recursive"
},
"gitHooks": {
"pre-commit": "lint-staged"
},
"lint-staged": {
"*.js": [
"eslint --fix --ignore-pattern '!.eslintrc.js'"
]
},
"keywords": [
"configuration",
"configarray",
"config file"
],
"license": "Apache-2.0",
"engines": {
"node": ">=10.10.0"
},
"dependencies": {
"@humanwhocodes/object-schema": "^2.0.3",
"debug": "^4.3.1",
"minimatch": "^3.0.5"
},
"devDependencies": {
"@nitpik/javascript": "0.4.0",
"@nitpik/node": "0.0.5",
"chai": "4.3.10",
"eslint": "8.52.0",
"esm": "3.2.25",
"lint-staged": "15.0.2",
"mocha": "6.2.3",
"nyc": "15.1.0",
"rollup": "3.28.1",
"yorkie": "2.0.0"
}
}

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# Changelog
## [1.0.1](https://github.com/humanwhocodes/module-importer/compare/v1.0.0...v1.0.1) (2022-08-18)
### Bug Fixes
* Ensure CommonJS mode works correctly. ([cf54a0b](https://github.com/humanwhocodes/module-importer/commit/cf54a0b998085066fbe1776dd0b4cacd808cc192)), closes [#6](https://github.com/humanwhocodes/module-importer/issues/6)
## 1.0.0 (2022-08-17)
### Features
* Implement ModuleImporter ([3ce4e82](https://www.github.com/humanwhocodes/module-importer/commit/3ce4e820c30c114e787bfed00a0966ac4772f563))

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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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# ModuleImporter
by [Nicholas C. Zakas](https://humanwhocodes.com)
If you find this useful, please consider supporting my work with a [donation](https://humanwhocodes.com/donate).
## Description
A utility for seamlessly importing modules in Node.js regardless if they are CommonJS or ESM format. Under the hood, this uses `import()` and relies on Node.js's CommonJS compatibility to work correctly. This ensures that the correct locations and formats are used for CommonJS so you can call one method and not worry about any compatibility issues.
The problem with the default `import()` is that it always resolves relative to the file location in which it is called. If you want to resolve from a different location, you need to jump through a few hoops to achieve that. This package makes it easy to both resolve and import modules from any directory.
## Usage
### Node.js
Install using [npm][npm] or [yarn][yarn]:
```
npm install @humanwhocodes/module-importer
# or
yarn add @humanwhocodes/module-importer
```
Import into your Node.js project:
```js
// CommonJS
const { ModuleImporter } = require("@humanwhocodes/module-importer");
// ESM
import { ModuleImporter } from "@humanwhocodes/module-importer";
```
### Bun
Install using this command:
```
bun add @humanwhocodes/module-importer
```
Import into your Bun project:
```js
import { ModuleImporter } from "@humanwhocodes/module-importer";
```
## API
After importing, create a new instance of `ModuleImporter` to start emitting events:
```js
// cwd can be omitted to use process.cwd()
const importer = new ModuleImporter(cwd);
// you can resolve the location of any package
const location = importer.resolve("./some-file.cjs");
// you can also import directly
const module = importer.import("./some-file.cjs");
```
For both `resolve()` and `import()`, you can pass in package names and filenames.
## Developer Setup
1. Fork the repository
2. Clone your fork
3. Run `npm install` to setup dependencies
4. Run `npm test` to run tests
## License
Apache 2.0
[npm]: https://npmjs.com/
[yarn]: https://yarnpkg.com/

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'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
var module$1 = require('module');
var url = require('url');
var path = require('path');
/**
* @fileoverview Universal module importer
*/
//-----------------------------------------------------------------------------
// Helpers
//-----------------------------------------------------------------------------
const __filename$1 = url.fileURLToPath((typeof document === 'undefined' ? new (require('u' + 'rl').URL)('file:' + __filename).href : (document.currentScript && document.currentScript.src || new URL('module-importer.cjs', document.baseURI).href)));
const __dirname$1 = path.dirname(__filename$1);
const require$1 = module$1.createRequire(__dirname$1 + "/");
const { ModuleImporter } = require$1("./module-importer.cjs");
exports.ModuleImporter = ModuleImporter;

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export class ModuleImporter {
/**
* Creates a new instance.
* @param {string} [cwd] The current working directory to resolve from.
*/
constructor(cwd?: string);
/**
* The base directory from which paths should be resolved.
* @type {string}
*/
cwd: string;
/**
* Resolves a module based on its name or location.
* @param {string} specifier Either an npm package name or
* relative file path.
* @returns {string|undefined} The location of the import.
* @throws {Error} If specifier cannot be located.
*/
resolve(specifier: string): string | undefined;
/**
* Imports a module based on its name or location.
* @param {string} specifier Either an npm package name or
* relative file path.
* @returns {Promise<object>} The module's object.
*/
import(specifier: string): Promise<object>;
}

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export { ModuleImporter };
import { ModuleImporter } from "./module-importer.cjs";

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import { createRequire } from 'module';
import { fileURLToPath } from 'url';
import { dirname } from 'path';
/**
* @fileoverview Universal module importer
*/
//-----------------------------------------------------------------------------
// Helpers
//-----------------------------------------------------------------------------
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
const require = createRequire(__dirname + "/");
const { ModuleImporter } = require("./module-importer.cjs");
export { ModuleImporter };

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{
"name": "@humanwhocodes/module-importer",
"version": "1.0.1",
"description": "Universal module importer for Node.js",
"main": "src/module-importer.cjs",
"module": "src/module-importer.js",
"type": "module",
"types": "dist/module-importer.d.ts",
"exports": {
"require": "./src/module-importer.cjs",
"import": "./src/module-importer.js"
},
"files": [
"dist",
"src"
],
"publishConfig": {
"access": "public"
},
"gitHooks": {
"pre-commit": "lint-staged"
},
"lint-staged": {
"*.js": [
"eslint --fix"
]
},
"funding": {
"type": "github",
"url": "https://github.com/sponsors/nzakas"
},
"scripts": {
"build": "rollup -c && tsc",
"prepare": "npm run build",
"lint": "eslint src/ tests/",
"test:unit": "c8 mocha tests/module-importer.test.js",
"test:build": "node tests/pkg.test.cjs && node tests/pkg.test.mjs",
"test": "npm run test:unit && npm run test:build"
},
"repository": {
"type": "git",
"url": "git+https://github.com/humanwhocodes/module-importer.git"
},
"keywords": [
"modules",
"esm",
"commonjs"
],
"engines": {
"node": ">=12.22"
},
"author": "Nicholas C. Zaks",
"license": "Apache-2.0",
"devDependencies": {
"@types/node": "^18.7.6",
"c8": "7.12.0",
"chai": "4.3.6",
"eslint": "8.22.0",
"lint-staged": "13.0.3",
"mocha": "9.2.2",
"rollup": "2.78.0",
"typescript": "4.7.4",
"yorkie": "2.0.0"
}
}

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/**
* @fileoverview Universal module importer
*/
//-----------------------------------------------------------------------------
// Imports
//-----------------------------------------------------------------------------
const { createRequire } = require("module");
const { pathToFileURL } = require("url");
//-----------------------------------------------------------------------------
// Helpers
//-----------------------------------------------------------------------------
const SLASHES = new Set(["/", "\\"]);
/**
* Normalizes directories to have a trailing slash.
* Resolve is pretty finicky -- if the directory name doesn't have
* a trailing slash then it tries to look in the parent directory.
* i.e., if the directory is "/usr/nzakas/foo" it will start the
* search in /usr/nzakas. However, if the directory is "/user/nzakas/foo/",
* then it will start the search in /user/nzakas/foo.
* @param {string} directory The directory to check.
* @returns {string} The normalized directory.
*/
function normalizeDirectory(directory) {
if (!SLASHES.has(directory[directory.length-1])) {
return directory + "/";
}
return directory;
}
//-----------------------------------------------------------------------------
// Exports
//-----------------------------------------------------------------------------
/**
* Class for importing both CommonJS and ESM modules in Node.js.
*/
exports.ModuleImporter = class ModuleImporter {
/**
* Creates a new instance.
* @param {string} [cwd] The current working directory to resolve from.
*/
constructor(cwd = process.cwd()) {
/**
* The base directory from which paths should be resolved.
* @type {string}
*/
this.cwd = normalizeDirectory(cwd);
}
/**
* Resolves a module based on its name or location.
* @param {string} specifier Either an npm package name or
* relative file path.
* @returns {string|undefined} The location of the import.
* @throws {Error} If specifier cannot be located.
*/
resolve(specifier) {
const require = createRequire(this.cwd);
return require.resolve(specifier);
}
/**
* Imports a module based on its name or location.
* @param {string} specifier Either an npm package name or
* relative file path.
* @returns {Promise<object>} The module's object.
*/
import(specifier) {
const location = this.resolve(specifier);
return import(pathToFileURL(location).href);
}
}

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/**
* @fileoverview Universal module importer
*/
//-----------------------------------------------------------------------------
// Imports
//-----------------------------------------------------------------------------
import { createRequire } from "module";
import { fileURLToPath } from "url";
import { dirname } from "path";
//-----------------------------------------------------------------------------
// Helpers
//-----------------------------------------------------------------------------
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);
const require = createRequire(__dirname + "/");
const { ModuleImporter } = require("./module-importer.cjs");
export { ModuleImporter };

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# Changelog
## [2.0.3](https://github.com/humanwhocodes/object-schema/compare/v2.0.2...v2.0.3) (2024-04-01)
### Bug Fixes
* Ensure test files are not including in package ([6eeb32c](https://github.com/humanwhocodes/object-schema/commit/6eeb32cc76a3e37d76b2990bd603d72061c816e0)), closes [#19](https://github.com/humanwhocodes/object-schema/issues/19)
## [2.0.2](https://github.com/humanwhocodes/object-schema/compare/v2.0.1...v2.0.2) (2024-01-10)
### Bug Fixes
* WrapperError should be an actual error ([2523f01](https://github.com/humanwhocodes/object-schema/commit/2523f014168167e5a40bb63e0cc03231b2c0f1bf))
## [2.0.1](https://github.com/humanwhocodes/object-schema/compare/v2.0.0...v2.0.1) (2023-10-20)
### Bug Fixes
* Custom properties should be available on thrown errors ([6ca80b0](https://github.com/humanwhocodes/object-schema/commit/6ca80b001a4ffb678b9b5544fc53322117374376))
## [2.0.0](https://github.com/humanwhocodes/object-schema/compare/v1.2.1...v2.0.0) (2023-10-18)
### ⚠ BREAKING CHANGES
* Throw custom errors instead of generics.
### Features
* Throw custom errors instead of generics. ([c6c01d7](https://github.com/humanwhocodes/object-schema/commit/c6c01d71eb354bf7b1fb3e883c40f7bd9b61647c))
### [1.2.1](https://www.github.com/humanwhocodes/object-schema/compare/v1.2.0...v1.2.1) (2021-11-02)
### Bug Fixes
* Never return original object from individual config ([5463c5c](https://www.github.com/humanwhocodes/object-schema/commit/5463c5c6d2cb35a7b7948dffc37c899a41d1775f))

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BSD 3-Clause License
Copyright (c) 2019, Human Who Codes
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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# JavaScript ObjectSchema Package
by [Nicholas C. Zakas](https://humanwhocodes.com)
If you find this useful, please consider supporting my work with a [donation](https://humanwhocodes.com/donate).
## Overview
A JavaScript object merge/validation utility where you can define a different merge and validation strategy for each key. This is helpful when you need to validate complex data structures and then merge them in a way that is more complex than `Object.assign()`.
## Installation
You can install using either npm:
```
npm install @humanwhocodes/object-schema
```
Or Yarn:
```
yarn add @humanwhocodes/object-schema
```
## Usage
Use CommonJS to get access to the `ObjectSchema` constructor:
```js
const { ObjectSchema } = require("@humanwhocodes/object-schema");
const schema = new ObjectSchema({
// define a definition for the "downloads" key
downloads: {
required: true,
merge(value1, value2) {
return value1 + value2;
},
validate(value) {
if (typeof value !== "number") {
throw new Error("Expected downloads to be a number.");
}
}
},
// define a strategy for the "versions" key
version: {
required: true,
merge(value1, value2) {
return value1.concat(value2);
},
validate(value) {
if (!Array.isArray(value)) {
throw new Error("Expected versions to be an array.");
}
}
}
});
const record1 = {
downloads: 25,
versions: [
"v1.0.0",
"v1.1.0",
"v1.2.0"
]
};
const record2 = {
downloads: 125,
versions: [
"v2.0.0",
"v2.1.0",
"v3.0.0"
]
};
// make sure the records are valid
schema.validate(record1);
schema.validate(record2);
// merge together (schema.merge() accepts any number of objects)
const result = schema.merge(record1, record2);
// result looks like this:
const result = {
downloads: 75,
versions: [
"v1.0.0",
"v1.1.0",
"v1.2.0",
"v2.0.0",
"v2.1.0",
"v3.0.0"
]
};
```
## Tips and Tricks
### Named merge strategies
Instead of specifying a `merge()` method, you can specify one of the following strings to use a default merge strategy:
* `"assign"` - use `Object.assign()` to merge the two values into one object.
* `"overwrite"` - the second value always replaces the first.
* `"replace"` - the second value replaces the first if the second is not `undefined`.
For example:
```js
const schema = new ObjectSchema({
name: {
merge: "replace",
validate() {}
}
});
```
### Named validation strategies
Instead of specifying a `validate()` method, you can specify one of the following strings to use a default validation strategy:
* `"array"` - value must be an array.
* `"boolean"` - value must be a boolean.
* `"number"` - value must be a number.
* `"object"` - value must be an object.
* `"object?"` - value must be an object or null.
* `"string"` - value must be a string.
* `"string!"` - value must be a non-empty string.
For example:
```js
const schema = new ObjectSchema({
name: {
merge: "replace",
validate: "string"
}
});
```
### Subschemas
If you are defining a key that is, itself, an object, you can simplify the process by using a subschema. Instead of defining `merge()` and `validate()`, assign a `schema` key that contains a schema definition, like this:
```js
const schema = new ObjectSchema({
name: {
schema: {
first: {
merge: "replace",
validate: "string"
},
last: {
merge: "replace",
validate: "string"
}
}
}
});
schema.validate({
name: {
first: "n",
last: "z"
}
});
```
### Remove Keys During Merge
If the merge strategy for a key returns `undefined`, then the key will not appear in the final object. For example:
```js
const schema = new ObjectSchema({
date: {
merge() {
return undefined;
},
validate(value) {
Date.parse(value); // throws an error when invalid
}
}
});
const object1 = { date: "5/5/2005" };
const object2 = { date: "6/6/2006" };
const result = schema.merge(object1, object2);
console.log("date" in result); // false
```
### Requiring Another Key Be Present
If you'd like the presence of one key to require the presence of another key, you can use the `requires` property to specify an array of other properties that any key requires. For example:
```js
const schema = new ObjectSchema();
const schema = new ObjectSchema({
date: {
merge() {
return undefined;
},
validate(value) {
Date.parse(value); // throws an error when invalid
}
},
time: {
requires: ["date"],
merge(first, second) {
return second;
},
validate(value) {
// ...
}
}
});
// throws error: Key "time" requires keys "date"
schema.validate({
time: "13:45"
});
```
In this example, even though `date` is an optional key, it is required to be present whenever `time` is present.
## License
BSD 3-Clause

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{
"name": "@humanwhocodes/object-schema",
"version": "2.0.3",
"description": "An object schema merger/validator",
"main": "src/index.js",
"files": [
"src",
"LICENSE",
"README.md"
],
"directories": {
"test": "tests"
},
"scripts": {
"test": "mocha tests/"
},
"repository": {
"type": "git",
"url": "git+https://github.com/humanwhocodes/object-schema.git"
},
"keywords": [
"object",
"validation",
"schema",
"merge"
],
"author": "Nicholas C. Zakas",
"license": "BSD-3-Clause",
"bugs": {
"url": "https://github.com/humanwhocodes/object-schema/issues"
},
"homepage": "https://github.com/humanwhocodes/object-schema#readme",
"devDependencies": {
"chai": "^4.2.0",
"eslint": "^5.13.0",
"mocha": "^5.2.0"
}
}

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/**
* @filedescription Object Schema Package
*/
exports.ObjectSchema = require("./object-schema").ObjectSchema;
exports.MergeStrategy = require("./merge-strategy").MergeStrategy;
exports.ValidationStrategy = require("./validation-strategy").ValidationStrategy;

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/**
* @filedescription Merge Strategy
*/
"use strict";
//-----------------------------------------------------------------------------
// Class
//-----------------------------------------------------------------------------
/**
* Container class for several different merge strategies.
*/
class MergeStrategy {
/**
* Merges two keys by overwriting the first with the second.
* @param {*} value1 The value from the first object key.
* @param {*} value2 The value from the second object key.
* @returns {*} The second value.
*/
static overwrite(value1, value2) {
return value2;
}
/**
* Merges two keys by replacing the first with the second only if the
* second is defined.
* @param {*} value1 The value from the first object key.
* @param {*} value2 The value from the second object key.
* @returns {*} The second value if it is defined.
*/
static replace(value1, value2) {
if (typeof value2 !== "undefined") {
return value2;
}
return value1;
}
/**
* Merges two properties by assigning properties from the second to the first.
* @param {*} value1 The value from the first object key.
* @param {*} value2 The value from the second object key.
* @returns {*} A new object containing properties from both value1 and
* value2.
*/
static assign(value1, value2) {
return Object.assign({}, value1, value2);
}
}
exports.MergeStrategy = MergeStrategy;

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/**
* @filedescription Object Schema
*/
"use strict";
//-----------------------------------------------------------------------------
// Requirements
//-----------------------------------------------------------------------------
const { MergeStrategy } = require("./merge-strategy");
const { ValidationStrategy } = require("./validation-strategy");
//-----------------------------------------------------------------------------
// Private
//-----------------------------------------------------------------------------
const strategies = Symbol("strategies");
const requiredKeys = Symbol("requiredKeys");
/**
* Validates a schema strategy.
* @param {string} name The name of the key this strategy is for.
* @param {Object} strategy The strategy for the object key.
* @param {boolean} [strategy.required=true] Whether the key is required.
* @param {string[]} [strategy.requires] Other keys that are required when
* this key is present.
* @param {Function} strategy.merge A method to call when merging two objects
* with the same key.
* @param {Function} strategy.validate A method to call when validating an
* object with the key.
* @returns {void}
* @throws {Error} When the strategy is missing a name.
* @throws {Error} When the strategy is missing a merge() method.
* @throws {Error} When the strategy is missing a validate() method.
*/
function validateDefinition(name, strategy) {
let hasSchema = false;
if (strategy.schema) {
if (typeof strategy.schema === "object") {
hasSchema = true;
} else {
throw new TypeError("Schema must be an object.");
}
}
if (typeof strategy.merge === "string") {
if (!(strategy.merge in MergeStrategy)) {
throw new TypeError(`Definition for key "${name}" missing valid merge strategy.`);
}
} else if (!hasSchema && typeof strategy.merge !== "function") {
throw new TypeError(`Definition for key "${name}" must have a merge property.`);
}
if (typeof strategy.validate === "string") {
if (!(strategy.validate in ValidationStrategy)) {
throw new TypeError(`Definition for key "${name}" missing valid validation strategy.`);
}
} else if (!hasSchema && typeof strategy.validate !== "function") {
throw new TypeError(`Definition for key "${name}" must have a validate() method.`);
}
}
//-----------------------------------------------------------------------------
// Errors
//-----------------------------------------------------------------------------
/**
* Error when an unexpected key is found.
*/
class UnexpectedKeyError extends Error {
/**
* Creates a new instance.
* @param {string} key The key that was unexpected.
*/
constructor(key) {
super(`Unexpected key "${key}" found.`);
}
}
/**
* Error when a required key is missing.
*/
class MissingKeyError extends Error {
/**
* Creates a new instance.
* @param {string} key The key that was missing.
*/
constructor(key) {
super(`Missing required key "${key}".`);
}
}
/**
* Error when a key requires other keys that are missing.
*/
class MissingDependentKeysError extends Error {
/**
* Creates a new instance.
* @param {string} key The key that was unexpected.
* @param {Array<string>} requiredKeys The keys that are required.
*/
constructor(key, requiredKeys) {
super(`Key "${key}" requires keys "${requiredKeys.join("\", \"")}".`);
}
}
/**
* Wrapper error for errors occuring during a merge or validate operation.
*/
class WrapperError extends Error {
/**
* Creates a new instance.
* @param {string} key The object key causing the error.
* @param {Error} source The source error.
*/
constructor(key, source) {
super(`Key "${key}": ${source.message}`, { cause: source });
// copy over custom properties that aren't represented
for (const key of Object.keys(source)) {
if (!(key in this)) {
this[key] = source[key];
}
}
}
}
//-----------------------------------------------------------------------------
// Main
//-----------------------------------------------------------------------------
/**
* Represents an object validation/merging schema.
*/
class ObjectSchema {
/**
* Creates a new instance.
*/
constructor(definitions) {
if (!definitions) {
throw new Error("Schema definitions missing.");
}
/**
* Track all strategies in the schema by key.
* @type {Map}
* @property strategies
*/
this[strategies] = new Map();
/**
* Separately track any keys that are required for faster validation.
* @type {Map}
* @property requiredKeys
*/
this[requiredKeys] = new Map();
// add in all strategies
for (const key of Object.keys(definitions)) {
validateDefinition(key, definitions[key]);
// normalize merge and validate methods if subschema is present
if (typeof definitions[key].schema === "object") {
const schema = new ObjectSchema(definitions[key].schema);
definitions[key] = {
...definitions[key],
merge(first = {}, second = {}) {
return schema.merge(first, second);
},
validate(value) {
ValidationStrategy.object(value);
schema.validate(value);
}
};
}
// normalize the merge method in case there's a string
if (typeof definitions[key].merge === "string") {
definitions[key] = {
...definitions[key],
merge: MergeStrategy[definitions[key].merge]
};
};
// normalize the validate method in case there's a string
if (typeof definitions[key].validate === "string") {
definitions[key] = {
...definitions[key],
validate: ValidationStrategy[definitions[key].validate]
};
};
this[strategies].set(key, definitions[key]);
if (definitions[key].required) {
this[requiredKeys].set(key, definitions[key]);
}
}
}
/**
* Determines if a strategy has been registered for the given object key.
* @param {string} key The object key to find a strategy for.
* @returns {boolean} True if the key has a strategy registered, false if not.
*/
hasKey(key) {
return this[strategies].has(key);
}
/**
* Merges objects together to create a new object comprised of the keys
* of the all objects. Keys are merged based on the each key's merge
* strategy.
* @param {...Object} objects The objects to merge.
* @returns {Object} A new object with a mix of all objects' keys.
* @throws {Error} If any object is invalid.
*/
merge(...objects) {
// double check arguments
if (objects.length < 2) {
throw new TypeError("merge() requires at least two arguments.");
}
if (objects.some(object => (object == null || typeof object !== "object"))) {
throw new TypeError("All arguments must be objects.");
}
return objects.reduce((result, object) => {
this.validate(object);
for (const [key, strategy] of this[strategies]) {
try {
if (key in result || key in object) {
const value = strategy.merge.call(this, result[key], object[key]);
if (value !== undefined) {
result[key] = value;
}
}
} catch (ex) {
throw new WrapperError(key, ex);
}
}
return result;
}, {});
}
/**
* Validates an object's keys based on the validate strategy for each key.
* @param {Object} object The object to validate.
* @returns {void}
* @throws {Error} When the object is invalid.
*/
validate(object) {
// check existing keys first
for (const key of Object.keys(object)) {
// check to see if the key is defined
if (!this.hasKey(key)) {
throw new UnexpectedKeyError(key);
}
// validate existing keys
const strategy = this[strategies].get(key);
// first check to see if any other keys are required
if (Array.isArray(strategy.requires)) {
if (!strategy.requires.every(otherKey => otherKey in object)) {
throw new MissingDependentKeysError(key, strategy.requires);
}
}
// now apply remaining validation strategy
try {
strategy.validate.call(strategy, object[key]);
} catch (ex) {
throw new WrapperError(key, ex);
}
}
// ensure required keys aren't missing
for (const [key] of this[requiredKeys]) {
if (!(key in object)) {
throw new MissingKeyError(key);
}
}
}
}
exports.ObjectSchema = ObjectSchema;

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/**
* @filedescription Validation Strategy
*/
"use strict";
//-----------------------------------------------------------------------------
// Class
//-----------------------------------------------------------------------------
/**
* Container class for several different validation strategies.
*/
class ValidationStrategy {
/**
* Validates that a value is an array.
* @param {*} value The value to validate.
* @returns {void}
* @throws {TypeError} If the value is invalid.
*/
static array(value) {
if (!Array.isArray(value)) {
throw new TypeError("Expected an array.");
}
}
/**
* Validates that a value is a boolean.
* @param {*} value The value to validate.
* @returns {void}
* @throws {TypeError} If the value is invalid.
*/
static boolean(value) {
if (typeof value !== "boolean") {
throw new TypeError("Expected a Boolean.");
}
}
/**
* Validates that a value is a number.
* @param {*} value The value to validate.
* @returns {void}
* @throws {TypeError} If the value is invalid.
*/
static number(value) {
if (typeof value !== "number") {
throw new TypeError("Expected a number.");
}
}
/**
* Validates that a value is a object.
* @param {*} value The value to validate.
* @returns {void}
* @throws {TypeError} If the value is invalid.
*/
static object(value) {
if (!value || typeof value !== "object") {
throw new TypeError("Expected an object.");
}
}
/**
* Validates that a value is a object or null.
* @param {*} value The value to validate.
* @returns {void}
* @throws {TypeError} If the value is invalid.
*/
static "object?"(value) {
if (typeof value !== "object") {
throw new TypeError("Expected an object or null.");
}
}
/**
* Validates that a value is a string.
* @param {*} value The value to validate.
* @returns {void}
* @throws {TypeError} If the value is invalid.
*/
static string(value) {
if (typeof value !== "string") {
throw new TypeError("Expected a string.");
}
}
/**
* Validates that a value is a non-empty string.
* @param {*} value The value to validate.
* @returns {void}
* @throws {TypeError} If the value is invalid.
*/
static "string!"(value) {
if (typeof value !== "string" || value.length === 0) {
throw new TypeError("Expected a non-empty string.");
}
}
}
exports.ValidationStrategy = ValidationStrategy;