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node_modules/is-expression/CHANGELOG.md

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+# Change Log
+
+Version 4.0.0 onwards are documented in [Releases](https://github.com/pugjs/is-expression/releases).
+
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## 3.0.0 - 2016-09-11
+### Added
+- Updated to acorn ~4.0.0
+  - ES2016 has been made the default `ecmaVersion`.
+  - Async functions are now implemented for `{ecmaVersion: 8}`.
+  - See [acorn's CHANGELOG][acorn-4.0.0] for a full list of changes.
+
+## 2.1.0 - 2016-07-27
+### Added
+- Updated to acorn ~3.3.0
+  - The ES2016 check for strict mode in function parameters is now implemented
+    for `{ecmaVersion: 7}`.
+  - See [acorn's CHANGELOG][acorn-3.3.0] for a full list of changes.
+
+## 2.0.1 - 2016-06-04
+### Added
+- Updated to acorn ~3.1.0
+  - See [acorn's CHANGELOG][acorn-3.1.0] for a list of changes.
+  - Even though it is a minor version bump for acorn, the new features are not
+    in parts of acorn we are using, and thus a patch level bump is warranted.
+
+## 2.0.0 - 2016-02-12
+### Added
+- Updated to acorn ~3.0.2
+  - See [acorn's CHANGELOG][acorn-3.0.0] for a list of breaking changes.
+
+## 1.0.2 - 2016-01-06
+### Added
+- Updated to acorn ~2.7.0
+
+## 1.0.1 - 2015-11-12
+### Fixed
+- Use a stricter version range for Acorn since we depend on Acorn internals.
+
+## 1.0.0 - 2015-11-11
+### Added
+- Initial release
+
+[acorn-4.0.0]: https://github.com/ternjs/acorn/blob/master/CHANGELOG.md#400-2016-08-07
+[acorn-3.3.0]: https://github.com/ternjs/acorn/blob/master/CHANGELOG.md#330-2016-07-25
+[acorn-3.1.0]: https://github.com/ternjs/acorn/blob/master/CHANGELOG.md#310-2016-04-18
+[acorn-3.0.0]: https://github.com/ternjs/acorn/blob/master/CHANGELOG.md#300-2016-02-10

node_modules/is-expression/LICENSE.md

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+Copyright (c) 2015 Tiancheng “Timothy” Gu
+
+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.

node_modules/is-expression/README.md

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+# is-expression
+
+Validates a string as a JavaScript expression
+
+[![Build Status](https://img.shields.io/travis/pugjs/is-expression/master.svg)](https://travis-ci.org/pugjs/is-expression)
+[![Dependency Status](https://img.shields.io/david/pugjs/is-expression.svg)](https://david-dm.org/pugjs/is-expression)
+[![Rolling Versions](https://img.shields.io/badge/Rolling%20Versions-Enabled-brightgreen)](https://rollingversions.com/pugjs/is-expression)
+[![npm version](https://img.shields.io/npm/v/is-expression.svg)](https://www.npmjs.org/package/is-expression)
+
+## Installation
+
+    npm install is-expression
+
+## Usage
+
+### `isExpression(src[, options])`
+
+Validates a string as a JavaScript expression.
+
+`src` contains the source.
+
+`options` can contain any Acorn options (since we use Acorn under-the-hood),
+or any of the following:
+
+- `throw`: Throw an error if the string is not an expression. The error can
+  be an Acorn error, with location information in `err.loc` and `err.pos`.
+  Defaults to `false`.
+- `strict`: Use strict mode when trying to parse the string. Defaults to
+  `false`. Even if this option is `false`, if you have provided
+  `options.sourceType === 'module'` which imples strict mode under ES2015,
+  strict mode will be used.
+- `lineComment`: When `true`, allows line comments in the expression.
+  Defaults to `false` for safety.
+
+See the examples below for usage.
+
+## Examples
+
+```js
+var isExpression = require('is-expression')
+
+isExpression('myVar')
+//=> true
+isExpression('var')
+//=> false
+isExpression('["an", "array", "\'s"].indexOf("index")')
+//=> true
+
+isExpression('var', {throw: true})
+// SyntaxError: Unexpected token (1:0)
+//     at Parser.pp.raise (acorn/dist/acorn.js:940:13)
+//     at ...
+
+isExpression('public')
+//=> true
+isExpression('public', {strict: true})
+//=> false
+
+isExpression('abc // my comment')
+//=> false
+isExpression('abc // my comment', {lineComment: true})
+//=> true
+```
+
+## License
+
+MIT

node_modules/is-expression/index.js

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+'use strict';
+
+var acorn = require('acorn');
+var objectAssign = require('object-assign');
+
+module.exports = isExpression;
+
+var DEFAULT_OPTIONS = {
+  throw: false,
+  strict: false,
+  lineComment: false
+};
+
+function isExpression(src, options) {
+  options = objectAssign({}, DEFAULT_OPTIONS, options);
+
+  try {
+    var parser = new acorn.Parser(options, src, 0);
+
+    if (options.strict) {
+      parser.strict = true;
+    }
+
+    if (!options.lineComment) {
+      parser.skipLineComment = function (startSkip) {
+        this.raise(this.pos, 'Line comments not allowed in an expression');
+      };
+    }
+
+    parser.nextToken();
+    parser.parseExpression();
+
+    if (parser.type !== acorn.tokTypes.eof) {
+      parser.unexpected();
+    }
+  } catch (ex) {
+    if (!options.throw) {
+      return false;
+    }
+
+    throw ex;
+  }
+
+  return true;
+}

node_modules/is-expression/package.json

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+{
+  "name": "is-expression",
+  "version": "4.0.0",
+  "files": [
+    "index.js"
+  ],
+  "description": "Check if a string is a valid JavaScript expression",
+  "keywords": [
+    "javascript",
+    "expression"
+  ],
+  "dependencies": {
+    "acorn": "^7.1.1",
+    "object-assign": "^4.1.1"
+  },
+  "devDependencies": {
+    "nyc": "^15.0.1",
+    "testit": "^3.1.0"
+  },
+  "scripts": {
+    "test": "node test && npm run coverage",
+    "coverage": "nyc node test.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/pugjs/is-expression.git"
+  },
+  "author": "Timothy Gu <timothygu99@gmail.com>",
+  "license": "MIT"
+}