init

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitattributes

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+* text=auto

.gitignore

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+coverage
+node_modules

.travis.yml

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+git:
+  depth: 1
+branches:
+  except: /^v\d/
+language: node_js
+node_js: stable
+after_script:
+  - npm install istanbul-coveralls
+  - npm run-script coverage
+  - node node_modules/.bin/istanbul-coveralls
+notifications:
+  email: false

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 Shinnosuke Watanabe
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# is-vfile-message
+
+[![NPM version](https://img.shields.io/npm/v/is-vfile-message.svg)](https://www.npmjs.com/package/is-vfile-message)
+[![Bower version](https://img.shields.io/bower/v/is-vfile-message.svg)](https://github.com/shinnn/is-vfile-message/releases)
+[![Build Status](https://travis-ci.org/shinnn/is-vfile-message.svg?branch=master)](https://travis-ci.org/shinnn/is-vfile-message)
+[![Coverage Status](https://img.shields.io/coveralls/shinnn/is-vfile-message.svg)](https://coveralls.io/github/shinnn/is-vfile-message)
+[![devDependency Status](https://david-dm.org/shinnn/is-vfile-message/dev-status.svg)](https://david-dm.org/shinnn/is-vfile-message#info=devDependencies)
+
+Check if a value is a [VFileMessage](https://github.com/wooorm/vfile#vfilemessage) object
+
+```javascript
+const VFile = require('vfile');
+const isVFileMessage = require('is-vfile-message');
+
+const file = new VFile();
+
+isVFileMessage(file.warn('error!')); //=> true
+```
+
+## Installation
+
+### Package managers
+
+#### [npm](https://www.npmjs.com/)
+
+```
+npm install is-vfile-message
+```
+
+#### [bower](http://bower.io/)
+
+```
+bower install is-vfile-message
+```
+
+### Standalone
+
+[Download the script file directly.](https://raw.githubusercontent.com/shinnn/is-vfile-message/master/browser.js)
+
+## API
+
+### isVFileMessage(*value*)
+
+*value*: any value  
+Return: `Boolean`
+
+It returns `true` if the argument is a valid [VFileMessage](https://github.com/wooorm/vfile/blob/500c69c2faa29cc837d6859009ff6b0788690aa9/index.js#L45-L71) object, otherwise `false`.
+
+```javascript
+isVFileMessage(new Error()); //=> false
+isVFileMessage({name: 'error!'}); //=> false
+isVFileMessage(); //=> false
+```
+
+## License
+
+Copyright (c) 2015 [Shinnosuke Watanabe](https://github.com/shinnn)
+
+Licensed under [the MIT License](./LICENSE).

bower.json

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+{
+  "name": "is-vfile-message",
+  "description": "Check if a value is a VFileMessage object",
+  "keywords": [
+    "vfile",
+    "virtual",
+    "file",
+    "message",
+    "check",
+    "checker",
+    "if",
+    "bool",
+    "boolean",
+    "error",
+    "type",
+    "typecheck",
+    "type-check"
+  ],
+  "main": "browser.js",
+  "moduleType": "globals",
+  "homepage": "https://github.com/shinnn/is-vfile-message",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/shinnn/is-vfile-message.git"
+  },
+  "authors": [
+    "Shinnosuke Watanabe (https://github.com/shinnn)"
+  ],
+  "license": "MIT",
+  "ignore": [
+    "**/.*",
+    "*.js",
+    "*.json",
+    "coverage",
+    "node_modules"
+  ]
+}

browser.js

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+/*!
+ * is-vfile-message | MIT (c) Shinnosuke Watanabe
+ * https://github.com/shinnn/is-vfile-message
+*/
+(function() {
+  'use strict';
+
+  var locationPropNames = ['start', 'end'];
+  var rangePropNames = ['line', 'column'];
+  var i;
+  var ii;
+  var p;
+  var pp;
+  var loc;
+
+  window.isVFileMessage = function isVFileMessage(obj) {
+    if (!(
+      obj instanceof Error &&
+      typeof obj.name === 'string' &&
+      typeof obj.file === 'string' &&
+      typeof obj.reason === 'string' &&
+      (obj.line === null || typeof obj.line === 'number') &&
+      (obj.column === null || typeof obj.column === 'number') &&
+      obj.location !== null &&
+      typeof obj.location === 'object' &&
+      typeof obj.fatal === 'boolean'
+    )) {
+      return false;
+    }
+
+    loc = obj.location;
+    i = 2;
+
+    while (i--) {
+      p = locationPropNames[i];
+
+      if (!(
+        loc[p] !== null &&
+        typeof loc[p] === 'object'
+      )) {
+        return false;
+      }
+
+      ii = 2;
+
+      while (ii--) {
+        pp = rangePropNames[ii];
+        if (!(loc[p][pp] === null || typeof loc[p][pp] === 'number')) {
+          return false;
+        }
+      }
+    }
+
+    return true;
+  };
+})();

index.js

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+/*!
+ * is-vfile-message | MIT (c) Shinnosuke Watanabe
+ * https://github.com/shinnn/is-vfile-message
+*/
+'use strict';
+
+var locationPropNames = ['start', 'end'];
+var rangePropNames = ['line', 'column'];
+var i;
+var ii;
+var p;
+var pp;
+var loc;
+
+module.exports = function isVFileMessage(obj) {
+  if (!(
+    obj instanceof Error &&
+    typeof obj.name === 'string' &&
+    typeof obj.file === 'string' &&
+    typeof obj.reason === 'string' &&
+    (obj.line === null || typeof obj.line === 'number') &&
+    (obj.column === null || typeof obj.column === 'number') &&
+    obj.location !== null &&
+    typeof obj.location === 'object' &&
+    typeof obj.fatal === 'boolean'
+  )) {
+    return false;
+  }
+
+  loc = obj.location;
+  i = 2;
+
+  while (i--) {
+    p = locationPropNames[i];
+
+    if (!(
+      loc[p] !== null &&
+      typeof loc[p] === 'object'
+    )) {
+      return false;
+    }
+
+    ii = 2;
+
+    while (ii--) {
+      pp = rangePropNames[ii];
+      if (!(loc[p][pp] === null || typeof loc[p][pp] === 'number')) {
+        return false;
+      }
+    }
+  }
+
+  return true;
+};

package.json

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+{
+  "name": "is-vfile-message",
+  "version": "1.0.0",
+  "description": "Check if a value is a VFileMessage object",
+  "repository": "shinnn/is-vfile-message",
+  "author": "Shinnosuke Watanabe (https://github.com/shinnn)",
+  "scripts": {
+    "pretest": "eslint --fix --config @shinnn browser.js index.js test.js",
+    "test": "node --strong_mode --throw-deprecation --track-heap-objects test.js | tap-spec",
+    "coverage": "node --strong_mode node_modules/.bin/istanbul cover test.js"
+  },
+  "license": "MIT",
+  "files": [
+    "index.js"
+  ],
+  "keywords": [
+    "vfile",
+    "virtual",
+    "file",
+    "message",
+    "check",
+    "checker",
+    "if",
+    "bool",
+    "boolean",
+    "error",
+    "type",
+    "typecheck",
+    "type-check",
+    "client-side",
+    "browser"
+  ],
+  "devDependencies": {
+    "@shinnn/eslint-config": "^1.4.0",
+    "eslint": "^1.10.2",
+    "istanbul": "^0.4.1",
+    "tap-spec": "^4.1.1",
+    "tape": "^4.2.2"
+  }
+}

test.js

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+'use strong';
+
+const alex = require('alex');
+const test = require('tape');
+const VFile = require('vfile');
+
+function runTest(description, isVFileMessage) {
+  test(description, t => {
+    t.plan(7);
+
+    t.strictEqual(isVFileMessage.name, 'isVFileMessage', 'should have a function name.');
+
+    t.strictEqual(
+      isVFileMessage(alex('maniac').messages[0]),
+      true,
+      'should return true when it takes a VFileMessage.'
+    );
+
+    t.strictEqual(
+      isVFileMessage((new VFile()).warn('')),
+      true,
+      'should return true even if it takes an almost empty VFileMessage.'
+    );
+
+    const fakeMessage = new Error();
+    fakeMessage.name = '';
+    fakeMessage.file = '';
+    fakeMessage.reason = '';
+    fakeMessage.line = 1;
+    fakeMessage.column = 1;
+    fakeMessage.location = {};
+    fakeMessage.fatal = false;
+
+    t.strictEqual(
+      isVFileMessage(fakeMessage),
+      false,
+      'should return false when it doesn\'t match the spec.'
+    );
+
+    fakeMessage.location.start = {};
+    fakeMessage.location.end = {};
+
+    t.strictEqual(
+      isVFileMessage(fakeMessage),
+      false,
+      'should return false when the properties don\'t match the spec.'
+    );
+
+    t.strictEqual(isVFileMessage(1), false, 'should return false when it takes non-object value.');
+
+    t.strictEqual(isVFileMessage(), false, 'should return false when it takes no arguments.');
+  });
+}
+
+runTest('require(\'is-vfile-message\')', require('.'));
+
+global.window = {};
+require('./' + require('./bower.json').main);
+
+runTest('window.isVFileMessage', global.window.isVFileMessage);