- .pipe(identityMap()) // .js and .css files will get a generated sourcemap
- .pipe(sourcemaps.write())
- .pipe(gulp.dest(...))
-```
-
-## API
-
-### `identityMap()`
-
-Returns an `objectMode` Transform stream that processes each file with a `.sourceMap` property and buffered contents. A sourcemap is generated and attached for each `.js` and `.css` file.
-[**Compiling to JavaScript, and Debugging with Source Maps**](https://hacks.mozilla.org/2013/05/compiling-to-javascript-and-debugging-with-source-maps/)
-Takes a map function as the only argument. Returns an `objectMode` Transform stream.
-
-#### `mapFn(sourcePath, file)`
-
-The map function is called once per value of the `sources` array of a `sourceMap` attached to each [`Vinyl`][vinyl-url] object passed through the stream. The map function is called with the `sourcePath` string from the `sources` array and the `file` object it originated from. The return value replaces the original value in the array.
-
-If a `Vinyl` object doesn't have a `sourceMap` or `sourceMap.sources` property, the file is passed through the stream without having the `mapFn` called.
-
-All `sources` are normalized to use `/` instead of `\\` as path separators.
-A _second_ republish of the code in 5.5.1, this time with yarn, to hopefully get valid timestamps.
-
-## 5.5.2 (2018-03-08)
-
-### Bug fixes
-
-A republish of the code in 5.5.1 in an attempt to solve an issue with the file timestamps in the npm package being 0.
-
-## 5.5.2 (2018-03-08)
-
-### Bug fixes
-
-A republish of the code in 5.5.1 in an attempt to solve an issue with the file timestamps in the npm package being 0.
-
-## 5.5.1 (2018-03-06)
-
-### Bug fixes
-
-Fix regression in walker causing property values in object patterns to be walked as expressions.
-
-Fix misleading error message for octal escapes in template strings.
-
-## 5.5.0 (2018-02-27)
-
-### Bug fixes
-
-Support object spread in the AST walker.
-
-### New features
-
-The identifier character categorization is now based on Unicode version 10.
-
-Acorn will now validate the content of regular expressions, including new ES9 features.
-
-## 5.4.1 (2018-02-02)
-
-### Bug fixes
-
-5.4.0 somehow accidentally included an old version of walk.js.
-
-## 5.4.0 (2018-02-01)
-
-### Bug fixes
-
-Disallow duplicate or escaped flags on regular expressions.
-
-Disallow octal escapes in strings in strict mode.
-
-### New features
-
-Add support for async iteration.
-
-Add support for object spread and rest.
-
-## 5.3.0 (2017-12-28)
-
-### Bug fixes
-
-Fix parsing of floating point literals with leading zeroes in loose mode.
-
-Allow duplicate property names in object patterns.
-
-Don't allow static class methods named `prototype`.
-
-Disallow async functions directly under `if` or `else`.
-
-Parse right-hand-side of `for`/`of` as an assignment expression.
-
-Stricter parsing of `for`/`in`.
-
-Don't allow unicode escapes in contextual keywords.
-
-### New features
-
-Parsing class members was factored into smaller methods to allow plugins to hook into it.
-
-## 5.2.1 (2017-10-30)
-
-### Bug fixes
-
-Fix a token context corruption bug.
-
-## 5.2.0 (2017-10-30)
-
-### Bug fixes
-
-Fix token context tracking for `class` and `function` in property-name position.
-
-Make sure `%*` isn't parsed as a valid operator.
-
-The `full` and `fullAncestor` walkers no longer visit nodes multiple times.
-
-Allow shorthand properties `get` and `set` to be followed by default values.
-
-Disallow `super` when not in callee or object position.
-
-### New features
-
-Support [`directive` property](https://github.com/estree/estree/compare/b3de58c9997504d6fba04b72f76e6dd1619ee4eb...1da8e603237144f44710360f8feb7a9977e905e0) on directive expression statements.
-
-## 5.1.2 (2017-09-04)
-
-### Bug fixes
-
-Disable parsing of legacy HTML-style comments in modules.
-
-Fix parsing of async methods whose names are keywords.
-
-## 5.1.1 (2017-07-06)
-
-### Bug fixes
-
-Fix problem with disambiguating regexp and division after a class.
-
-## 5.1.0 (2017-07-05)
-
-### Bug fixes
-
-Fix tokenizing of regexps in an object-desctructuring `for`/`of` loop and after `yield`.
-
-Parse zero-prefixed numbers with non-octal digits as decimal.
-
-Allow object/array patterns in rest parameters.
-
-Don't error when `yield` is used as a property name.
-
-Allow `async` as a shorthand object property.
-
-Make the ES module version of the loose parser actually work.
-
-### New features
-
-Implement the [template literal revision proposal](https://github.com/tc39/proposal-template-literal-revision) for ES9.
-
-New walker functions `full` and `fullAncestor`.
-
-## 5.0.3 (2017-04-01)
-
-### Bug fixes
-
-Fix spurious duplicate variable definition errors for named functions.
-
-## 5.0.2 (2017-03-30)
-
-### Bug fixes
-
-A binary operator after a parenthesized arrow expression is no longer incorrectly treated as an error.
-
-## 5.0.0 (2017-03-28)
-
-### Bug fixes
-
-Raise an error for duplicated lexical bindings.
-
-Fix spurious error when an assignement expression occurred after a spread expression.
-
-Accept regular expressions after `of` (in `for`/`of`), `yield` (in a generator), and braced arrow functions.
-
-Allow labels in front or `var` declarations, even in strict mode.
-
-### Breaking changes
-
-Parse declarations following `export default` as declaration nodes, not expressions. This means that class and function declarations nodes can now have `null` as their `id`.
-
-## 4.0.11 (2017-02-07)
-
-### Bug fixes
-
-Allow all forms of member expressions to be parenthesized as lvalue.
-
-## 4.0.10 (2017-02-07)
-
-### Bug fixes
-
-Don't expect semicolons after default-exported functions or classes,
-even when they are expressions.
-
-Check for use of `'use strict'` directives in non-simple parameter
-functions, even when already in strict mode.
-
-## 4.0.9 (2017-02-06)
-
-### Bug fixes
-
-Fix incorrect error raised for parenthesized simple assignment
-targets, so that `(x) = 1` parses again.
-
-## 4.0.8 (2017-02-03)
-
-### Bug fixes
-
-Solve spurious parenthesized pattern errors by temporarily erring on
-the side of accepting programs that our delayed errors don't handle
-correctly yet.
-
-## 4.0.7 (2017-02-02)
-
-### Bug fixes
-
-Accept invalidly rejected code like `(x).y = 2` again.
-
-Don't raise an error when a function _inside_ strict code has a
-non-simple parameter list.
-
-## 4.0.6 (2017-02-02)
-
-### Bug fixes
-
-Fix exponential behavior (manifesting itself as a complete hang for
-even relatively small source files) introduced by the new 'use strict'
-check.
-
-## 4.0.5 (2017-02-02)
-
-### Bug fixes
-
-Disallow parenthesized pattern expressions.
-
-Allow keywords as export names.
-
-Don't allow the `async` keyword to be parenthesized.
-
-Properly raise an error when a keyword contains a character escape.
-
-Allow `"use strict"` to appear after other string literal expressions.
-
-Disallow labeled declarations.
-
-## 4.0.4 (2016-12-19)
-
-### Bug fixes
-
-Fix issue with loading acorn_loose.js with an AMD loader.
-
-Fix crash when `export` was followed by a keyword that can't be
-exported.
-
-## 4.0.3 (2016-08-16)
-
-### Bug fixes
-
-Allow regular function declarations inside single-statement `if`
-branches in loose mode. Forbid them entirely in strict mode.
-
-Properly parse properties named `async` in ES2017 mode.
-
-Fix bug where reserved words were broken in ES2017 mode.
-
-## 4.0.2 (2016-08-11)
-
-### Bug fixes
-
-Don't ignore period or 'e' characters after octal numbers.
-
-Fix broken parsing for call expressions in default parameter values
-of arrow functions.
-
-## 4.0.1 (2016-08-08)
-
-### Bug fixes
-
-Fix false positives in duplicated export name errors.
-
-## 4.0.0 (2016-08-07)
-
-### Breaking changes
-
-The default `ecmaVersion` option value is now 7.
-
-A number of internal method signatures changed, so plugins might need
-to be updated.
-
-### Bug fixes
-
-The parser now raises errors on duplicated export names.
-
-`arguments` and `eval` can now be used in shorthand properties.
-
-Duplicate parameter names in non-simple argument lists now always
-produce an error.
-
-### New features
-
-The `ecmaVersion` option now also accepts year-style version numbers
-(2015, etc).
-
-Support for `async`/`await` syntax when `ecmaVersion` is >= 8.
-
-Support for trailing commas in call expressions when `ecmaVersion`
-is >= 8.
-
-## 3.3.0 (2016-07-25)
-
-### Bug fixes
-
-Fix bug in tokenizing of regexp operator after a function declaration.
-
-Fix parser crash when parsing an array pattern with a hole.
-
-### New features
-
-Implement check against complex argument lists in functions that
-enable strict mode in ES7.
-
-## 3.2.0 (2016-06-07)
-
-### Bug fixes
-
-Improve handling of lack of unicode regexp support in host
-environment.
-
-Properly reject shorthand properties whose name is a keyword.
-
-Don't crash when the loose parser is called without options object.
-
-### New features
-
-Visitors created with `visit.make` now have their base as _prototype_,
-rather than copying properties into a fresh object.
-
-Make it possible to use `visit.ancestor` with a walk state.
-
-## 3.1.0 (2016-04-18)
-
-### Bug fixes
-
-Fix issue where the loose parser created invalid TemplateElement nodes
-for unclosed template literals.
-
-Properly tokenize the division operator directly after a function
-expression.
-
-Allow trailing comma in destructuring arrays.
-
-### New features
-
-The walker now allows defining handlers for `CatchClause` nodes.
-
-## 3.0.4 (2016-02-25)
-
-### Fixes
-
-Allow update expressions as left-hand-side of the ES7 exponential
-operator.
-
-## 3.0.2 (2016-02-10)
-
-### Fixes
-
-Fix bug that accidentally made `undefined` a reserved word when
-parsing ES7.
-
-## 3.0.0 (2016-02-10)
-
-### Breaking changes
-
-The default value of the `ecmaVersion` option is now 6 (used to be 5).
-
-Support for comprehension syntax (which was dropped from the draft
-spec) has been removed.
-
-### Fixes
-
-`let` and `yield` are now “contextual keywords”, meaning you can
-mostly use them as identifiers in ES5 non-strict code.
-
-A parenthesized class or function expression after `export default` is
-now parsed correctly.
-
-### New features
-
-When `ecmaVersion` is set to 7, Acorn will parse the exponentiation
-operator (`**`).
-
-The identifier character ranges are now based on Unicode 8.0.0.
-
-Plugins can now override the `raiseRecoverable` method to override the
-way non-critical errors are handled.
-
-## 2.7.0 (2016-01-04)
-
-### Fixes
-
-Stop allowing rest parameters in setters.
-
-Make sure the loose parser always attaches a `local` property to
-`ImportNamespaceSpecifier` nodes.
-
-Disallow `y` rexexp flag in ES5.
-
-Disallow `\00` and `\000` escapes in strict mode.
-
-Raise an error when an import name is a reserved word.
-
-## 2.6.4 (2015-11-12)
-
-### Fixes
-
-Fix crash in loose parser when parsing invalid object pattern.
-
-### New features
-
-Support plugins in the loose parser.
-
-## 2.6.2 (2015-11-10)
-
-### Fixes
-
-Don't crash when no options object is passed.
-
-## 2.6.0 (2015-11-09)
-
-### Fixes
-
-Add `await` as a reserved word in module sources.
-
-Disallow `yield` in a parameter default value for a generator.
-
-Forbid using a comma after a rest pattern in an array destructuring.
-
-### New features
-
-Support parsing stdin in command-line tool.
-
-## 2.5.2 (2015-10-27)
-
-### Fixes
-
-Fix bug where the walker walked an exported `let` statement as an
-expression.
-
-## 2.5.0 (2015-10-27)
-
-### Fixes
-
-Fix tokenizer support in the command-line tool.
-
-In the loose parser, don't allow non-string-literals as import
-sources.
-
-Stop allowing `new.target` outside of functions.
-
-Remove legacy `guard` and `guardedHandler` properties from try nodes.
-
-Stop allowing multiple `__proto__` properties on an object literal in
-strict mode.
-
-Don't allow rest parameters to be non-identifier patterns.
-
-Check for duplicate paramter names in arrow functions.
- - [`acorn-objj`](https://github.com/cappuccino/acorn-objj): [Objective-J](http://www.cappuccino-project.org/learn/objective-j.html) language parser built as Acorn plugin
-
- Plugins for ECMAScript proposals:
-
- - [`acorn-stage3`](https://github.com/acornjs/acorn-stage3): Parse most stage 3 proposals, bundling:
- - [`acorn-static-class-property-initializer`](https://github.com/victor-homyakov/acorn-static-class-property-initializer): Partial support for static class properties from [ES Class Fields & Static Properties Proposal](https://github.com/tc39/proposal-class-public-fields) to support static property initializers in [React components written as ES6+ classes](https://babeljs.io/blog/2015/06/07/react-on-es6-plus)
- } else if (/invalid (unicode|regexp|number)|expecting unicode|octal literal|is reserved|directly after number|expected number in radix/i.test(msg)) {
- while (pos < this.input.length && !isSpace(this.input.charCodeAt(pos))) { ++pos; }
- } else if (/character escape|expected hexadecimal/i.test(msg)) {
- } else if (/invalid (unicode|regexp|number)|expecting unicode|octal literal|is reserved|directly after number|expected number in radix/i.test(msg)) {
- while (pos < this.input.length && !isSpace(this.input.charCodeAt(pos))) { ++pos; }
- } else if (/character escape|expected hexadecimal/i.test(msg)) {
-Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/ansi-gray/issues/new)
-By default you get a map of styles, but the styles are also available as groups. They are non-enumerable so they don't show up unless you access them explicitly. This makes it easier to expose only a subset in a higher-level module.
-Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/jonschlinkert/ansi-wrap/issues/new)