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ES module version of compiler for use in browsers; dynamic import() docs; revised Stage 3 policy (#5177) 

* Build both a legacy and modern browser compiler

* Dynamic import example and documentation

* Update the docs to use the modern browser compiler if the browser supports it

* Update policy regarding Stage 3 features

* This never made sense, and assigning a string to index 0 *of a string* throws in Module mode (and silently does nothing in Script mode) so remove this unneeded code that throws when compiling `fn for i from from iterable` in Module mode

* Have browser-based tests use the ES module version if supported

* Simplify building logic

* Update output

* For the ES module version of the browser compiler, don't automatically attach the runScripts event handler

* Consistent comments

* Fix comment
This commit is contained in:
Geoffrey Booth 2019-03-26 23:55:31 -07:00 committed by GitHub
parent 41b31c7293
commit f6d63776c3
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23 changed files with 11668 additions and 219 deletions
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44
Cakefile
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@ -66,15 +66,18 @@ build = (callback) ->
buildParser()
buildExceptParser callback
transpile = (code) ->
transpile = (code, options = {}) ->
options.minify = process.env.MINIFY isnt 'false'
options.transform = process.env.TRANSFORM isnt 'false'
babel = require '@babel/core'
presets = []
# Exclude the `modules` plugin in order to not break the `}(this));`
# at the end of the `build:browser` code block.
presets.push ['@babel/env', {modules: no}] unless process.env.TRANSFORM is 'false'
presets.push ['minify', {mangle: no, evaluate: no, removeUndefined: no}] unless process.env.MINIFY is 'false'
presets.push ['@babel/env', {modules: no}] if options.transform
presets.push ['minify', {mangle: no, evaluate: no, removeUndefined: no}] if options.minify
babelOptions =
compact: process.env.MINIFY isnt 'false'
compact: not options.minify
comments: not options.minify
presets: presets
sourceType: 'script'
{ code } = babel.transform code, babelOptions unless presets.length is 0
@ -140,13 +143,18 @@ task 'build:browser', 'merge the built scripts into a single file for use in a b
return module.exports;
})();
"""
# From here, we generate two outputs: a legacy script output for all browsers
# and a module output for browsers that support `<script type="module">`.
code = """
var CoffeeScript = function() {
function require(path){ return require[path]; }
#{code}
return require['./browser'];
}();
"""
scriptCode = transpile """
(function(root) {
var CoffeeScript = function() {
function require(path){ return require[path]; }
#{code}
return require['./browser'];
}();
#{code}
if (typeof define === 'function' && define.amd) {
define(function() { return CoffeeScript; });
@ -155,10 +163,20 @@ task 'build:browser', 'merge the built scripts into a single file for use in a b
}
}(this));
"""
code = transpile code
outputFolder = "docs/v#{majorVersion}/browser-compiler"
fs.mkdirSync outputFolder unless fs.existsSync outputFolder
fs.writeFileSync "#{outputFolder}/coffeescript.js", header + '\n' + code
moduleCode = """
#{code}
export default CoffeeScript;
const { VERSION, compile, eval: evaluate, load, run, runScripts } = CoffeeScript;
export { VERSION, compile, evaluate as eval, load, run, runScripts };
"""
for folder in ['browser-compiler', 'browser-compiler-modern']
outputFolder = "docs/v#{majorVersion}/#{folder}"
fs.mkdirSync outputFolder unless fs.existsSync outputFolder
fs.writeFileSync "#{outputFolder}/coffeescript.js", """
#{header}
#{if folder is 'browser-compiler' then scriptCode else moduleCode}
"""
task 'build:browser:full', 'merge the built scripts into a single file for use in a browser, and test it', ->
invoke 'build:browser'

1
docs/browser-compiler-modern Symbolic link
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@ -0,0 +1 @@
v2/browser-compiler-modern

17
docs/v2/annotated-source/browser.html
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@ -262,7 +262,7 @@ This happens on page load.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">runScripts</span> = -&gt;</span>
<div class="content"><div class='highlight'><pre>CoffeeScript.runScripts = <span class="hljs-function">-&gt;</span>
scripts = <span class="hljs-built_in">window</span>.<span class="hljs-built_in">document</span>.getElementsByTagName <span class="hljs-string">'script'</span>
coffeetypes = [<span class="hljs-string">'text/coffeescript'</span>, <span class="hljs-string">'text/literate-coffeescript'</span>]
coffees = (s <span class="hljs-keyword">for</span> s <span class="hljs-keyword">in</span> scripts <span class="hljs-keyword">when</span> s.type <span class="hljs-keyword">in</span> coffeetypes)
@ -321,14 +321,19 @@ only one CoffeeScript script block to parse.</p>
<div class="pilwrap ">
<a class="pilcrow" href="#section-10">&#182;</a>
</div>
<p>Listen for window load, both in decent browsers and in IE.</p>
<p>Listen for window load, both in decent browsers and in IE.
Only attach this event handler on startup for the
non-ES module version of the browser compiler, to preserve
backward compatibility while letting the ES module version
be importable without side effects.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">if</span> <span class="hljs-built_in">window</span>.addEventListener
<span class="hljs-built_in">window</span>.addEventListener <span class="hljs-string">'DOMContentLoaded'</span>, runScripts, <span class="hljs-literal">no</span>
<span class="hljs-keyword">else</span>
<span class="hljs-built_in">window</span>.attachEvent <span class="hljs-string">'onload'</span>, runScripts</pre></div></div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">if</span> <span class="hljs-keyword">this</span> <span class="hljs-keyword">is</span> <span class="hljs-built_in">window</span>
<span class="hljs-keyword">if</span> <span class="hljs-built_in">window</span>.addEventListener
<span class="hljs-built_in">window</span>.addEventListener <span class="hljs-string">'DOMContentLoaded'</span>, CoffeeScript.runScripts, <span class="hljs-literal">no</span>
<span class="hljs-keyword">else</span>
<span class="hljs-built_in">window</span>.attachEvent <span class="hljs-string">'onload'</span>, CoffeeScript.runScripts</pre></div></div>
</li>

136
docs/v2/annotated-source/coffeescript.html
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@ -282,6 +282,32 @@ it’s not likely to be used. Save in form of <code>filename</code>: [<code>(sou
<div class="pilwrap ">
<a class="pilcrow" href="#section-10">&#182;</a>
</div>
<p>This is exported to enable an external module to implement caching of
compilation results. When the compiled js source is loaded from cache, the
original coffee code should be added with this method in order to enable the
Error.prepareStackTrace below to correctly adjust the stack trace for the
corresponding file (the source map will be generated on demand).</p>
</div>
<div class="content"><div class='highlight'><pre>exports.registerCompiled = registerCompiled = <span class="hljs-function"><span class="hljs-params">(filename, source, sourcemap)</span> -&gt;</span>
sources[filename] ?= []
sources[filename].push source
<span class="hljs-keyword">if</span> sourcemap?
sourceMaps[filename] ?= []
sourceMaps[filename].push sourcemap</pre></div></div>
</li>
<li id="section-11">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-11">&#182;</a>
</div>
<p>Compile CoffeeScript code to JavaScript, using the Coffee/Jison compiler.</p>
<p>If <code>options.sourceMap</code> is specified, then <code>options.filename</code> must also be
specified. All options that can be passed to <code>SourceMap#generate</code> may also
@ -298,11 +324,11 @@ doing programmatic lookups.</p>
</li>
<li id="section-11">
<li id="section-12">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-11">&#182;</a>
<a class="pilcrow" href="#section-12">&#182;</a>
</div>
<p>Clone <code>options</code>, to avoid mutating the <code>options</code> object passed in.</p>
@ -313,11 +339,11 @@ doing programmatic lookups.</p>
</li>
<li id="section-12">
<li id="section-13">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-12">&#182;</a>
<a class="pilcrow" href="#section-13">&#182;</a>
</div>
<p>Always generate a source map if no filename is passed in, since without a
a filename we have no way to retrieve this source later in the event that
@ -330,8 +356,6 @@ we need to recompile it to get a source map for <code>prepareStackTrace</code>.<
checkShebangLine filename, code
sources[filename] ?= []
sources[filename].push code
map = <span class="hljs-keyword">new</span> SourceMap <span class="hljs-keyword">if</span> generateSourceMap
tokens = lexer.tokenize code, options</pre></div></div>
@ -339,11 +363,11 @@ we need to recompile it to get a source map for <code>prepareStackTrace</code>.<
</li>
<li id="section-13">
<li id="section-14">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-13">&#182;</a>
<a class="pilcrow" href="#section-14">&#182;</a>
</div>
<p>Pass a list of referenced variables, so that generated variables won’t get
the same name.</p>
@ -357,11 +381,11 @@ the same name.</p>
</li>
<li id="section-14">
<li id="section-15">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-14">&#182;</a>
<a class="pilcrow" href="#section-15">&#182;</a>
</div>
<p>Check for import or export; if found, force bare mode.</p>
@ -385,11 +409,11 @@ the same name.</p>
</li>
<li id="section-15">
<li id="section-16">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-15">&#182;</a>
<a class="pilcrow" href="#section-16">&#182;</a>
</div>
<p>Update the sourcemap with data from each fragment.</p>
@ -400,11 +424,11 @@ the same name.</p>
</li>
<li id="section-16">
<li id="section-17">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-16">&#182;</a>
<a class="pilcrow" href="#section-17">&#182;</a>
</div>
<p>Do not include empty, whitespace, or semicolon-only fragments.</p>
@ -425,11 +449,11 @@ the same name.</p>
</li>
<li id="section-17">
<li id="section-18">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-17">&#182;</a>
<a class="pilcrow" href="#section-18">&#182;</a>
</div>
<p>Copy the code from each fragment into the final JavaScript.</p>
@ -443,8 +467,6 @@ the same name.</p>
<span class="hljs-keyword">if</span> generateSourceMap
v3SourceMap = map.generate options, code
sourceMaps[filename] ?= []
sourceMaps[filename].push map
<span class="hljs-keyword">if</span> options.transpile
<span class="hljs-keyword">if</span> <span class="hljs-keyword">typeof</span> options.transpile <span class="hljs-keyword">isnt</span> <span class="hljs-string">'object'</span></pre></div></div>
@ -452,11 +474,11 @@ the same name.</p>
</li>
<li id="section-18">
<li id="section-19">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-18">&#182;</a>
<a class="pilcrow" href="#section-19">&#182;</a>
</div>
<p>This only happens if run via the Node API and <code>transpile</code> is set to
something other than an object.</p>
@ -468,11 +490,11 @@ something other than an object.</p>
</li>
<li id="section-19">
<li id="section-20">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-19">&#182;</a>
<a class="pilcrow" href="#section-20">&#182;</a>
</div>
<p>Get the reference to Babel that we have been passed if this compiler
is run via the CLI or Node API.</p>
@ -487,11 +509,11 @@ is run via the CLI or Node API.</p>
</li>
<li id="section-20">
<li id="section-21">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-20">&#182;</a>
<a class="pilcrow" href="#section-21">&#182;</a>
</div>
<p>See <a href="https://github.com/babel/babel/issues/827#issuecomment-77573107">https://github.com/babel/babel/issues/827#issuecomment-77573107</a>:
Babel can take a v3 source map object as input in <code>inputSourceMap</code>
@ -512,6 +534,8 @@ and it will return an <em>updated</em> v3 source map object in its output.</p>
sourceURL = <span class="hljs-string">"//# sourceURL=<span class="hljs-subst">#{options.filename ? <span class="hljs-string">'coffeescript'</span>}</span>"</span>
js = <span class="hljs-string">"<span class="hljs-subst">#{js}</span>\n<span class="hljs-subst">#{sourceMapDataURI}</span>\n<span class="hljs-subst">#{sourceURL}</span>"</span>
registerCompiled filename, code, map
<span class="hljs-keyword">if</span> options.sourceMap
{
js
@ -524,11 +548,11 @@ and it will return an <em>updated</em> v3 source map object in its output.</p>
</li>
<li id="section-21">
<li id="section-22">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-21">&#182;</a>
<a class="pilcrow" href="#section-22">&#182;</a>
</div>
<p>Tokenize a string of CoffeeScript code, and return the array of tokens.</p>
@ -540,11 +564,11 @@ and it will return an <em>updated</em> v3 source map object in its output.</p>
</li>
<li id="section-22">
<li id="section-23">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-22">&#182;</a>
<a class="pilcrow" href="#section-23">&#182;</a>
</div>
<p>Parse a string of CoffeeScript code or an array of lexed tokens, and
return the AST. You can then compile it by calling <code>.compile()</code> on the root,
@ -561,11 +585,11 @@ or traverse it by using <code>.traverseChildren()</code> with a callback.</p>
</li>
<li id="section-23">
<li id="section-24">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-23">&#182;</a>
<a class="pilcrow" href="#section-24">&#182;</a>
</div>
<p>This file used to export these methods; leave stubs that throw warnings
instead. These methods have been moved into <code>index.coffee</code> to provide
@ -581,11 +605,11 @@ environment.</p>
</li>
<li id="section-24">
<li id="section-25">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-24">&#182;</a>
<a class="pilcrow" href="#section-25">&#182;</a>
</div>
<p>Instantiate a Lexer for our use here.</p>
@ -596,11 +620,11 @@ environment.</p>
</li>
<li id="section-25">
<li id="section-26">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-25">&#182;</a>
<a class="pilcrow" href="#section-26">&#182;</a>
</div>
<p>The real Lexer produces a generic stream of tokens. This object provides a
thin wrapper around it, compatible with the Jison API. We can then pass it
@ -626,11 +650,11 @@ directly as a “Jison lexer.”</p>
</li>
<li id="section-26">
<li id="section-27">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-26">&#182;</a>
<a class="pilcrow" href="#section-27">&#182;</a>
</div>
<p>Make all the AST nodes visible to the parser.</p>
@ -641,11 +665,11 @@ directly as a “Jison lexer.”</p>
</li>
<li id="section-27">
<li id="section-28">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-27">&#182;</a>
<a class="pilcrow" href="#section-28">&#182;</a>
</div>
<p>Override Jison’s default error handling function.</p>
@ -656,11 +680,11 @@ directly as a “Jison lexer.”</p>
</li>
<li id="section-28">
<li id="section-29">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-28">&#182;</a>
<a class="pilcrow" href="#section-29">&#182;</a>
</div>
<p>Disregard Jison’s message, it contains redundant line number information.
Disregard the token, we take its value directly from the lexer in case
@ -684,11 +708,11 @@ the error is caused by a generated token which might refer to its origin.</p>
</li>
<li id="section-29">
<li id="section-30">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-29">&#182;</a>
<a class="pilcrow" href="#section-30">&#182;</a>
</div>
<p>The second argument has a <code>loc</code> property, which should have the location
data for this token. Unfortunately, Jison seems to send an outdated <code>loc</code>
@ -702,11 +726,11 @@ from the lexer.</p>
</li>
<li id="section-30">
<li id="section-31">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-30">&#182;</a>
<a class="pilcrow" href="#section-31">&#182;</a>
</div>
<p>Based on <a href="http://v8.googlecode.com/svn/branches/bleeding_edge/src/messages.js">http://v8.googlecode.com/svn/branches/bleeding_edge/src/messages.js</a>
Modified to handle sourceMap</p>
@ -734,11 +758,11 @@ Modified to handle sourceMap</p>
</li>
<li id="section-31">
<li id="section-32">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-31">&#182;</a>
<a class="pilcrow" href="#section-32">&#182;</a>
</div>
<p>Check for a sourceMap position</p>
@ -781,11 +805,11 @@ Modified to handle sourceMap</p>
</li>
<li id="section-32">
<li id="section-33">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-32">&#182;</a>
<a class="pilcrow" href="#section-33">&#182;</a>
</div>
<p>Skip files that we didn’t compile, like Node system files that appear in
the stack trace, as they never have source maps.</p>
@ -800,11 +824,11 @@ the stack trace, as they never have source maps.</p>
</li>
<li id="section-33">
<li id="section-34">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-33">&#182;</a>
<a class="pilcrow" href="#section-34">&#182;</a>
</div>
<p>CoffeeScript compiled in a browser or via <code>CoffeeScript.compile</code> or <code>.run</code>
may get compiled with <code>options.filename</code> that’s missing, which becomes
@ -819,11 +843,11 @@ filename of the script file. See if we have a source map cached under
</li>
<li id="section-34">
<li id="section-35">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-34">&#182;</a>
<a class="pilcrow" href="#section-35">&#182;</a>
</div>
<p>Work backwards from the most recent anonymous source maps, until we find
one that works. This isn’t foolproof; there is a chance that multiple
@ -840,11 +864,11 @@ and it’s not foolproof either.</p>
</li>
<li id="section-35">
<li id="section-36">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-35">&#182;</a>
<a class="pilcrow" href="#section-36">&#182;</a>
</div>
<p>If all else fails, recompile this source to get a source map. We need the
previous section (for <code>&lt;anonymous&gt;</code>) despite this option, because after it
@ -867,11 +891,11 @@ time the source map we want is the last one.</p>
</li>
<li id="section-36">
<li id="section-37">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-36">&#182;</a>
<a class="pilcrow" href="#section-37">&#182;</a>
</div>
<p>Based on <a href="http://goo.gl/ZTx1p">michaelficarra/CoffeeScriptRedux</a>
NodeJS / V8 have no support for transforming positions in stack traces using

4
docs/v2/annotated-source/grammar.html
View File

@ -616,6 +616,7 @@ the ordinary <strong>Assign</strong> is that these allow numbers and strings as
o <span class="hljs-string">'Super'</span>
o <span class="hljs-string">'This'</span>
o <span class="hljs-string">'SUPER Arguments'</span>, <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> SuperCall LOC(<span class="hljs-number">1</span>)(<span class="hljs-keyword">new</span> Super), $<span class="hljs-number">2</span>, <span class="hljs-literal">no</span>, $<span class="hljs-number">1</span>
o <span class="hljs-string">'DYNAMIC_IMPORT Arguments'</span>, <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> DynamicImportCall LOC(<span class="hljs-number">1</span>)(<span class="hljs-keyword">new</span> DynamicImport), $<span class="hljs-number">2</span>
o <span class="hljs-string">'SimpleObjAssignable Arguments'</span>, <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> Call (<span class="hljs-keyword">new</span> Value $<span class="hljs-number">1</span>), $<span class="hljs-number">2</span>
o <span class="hljs-string">'ObjSpreadExpr Arguments'</span>, <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> Call $<span class="hljs-number">1</span>, $<span class="hljs-number">2</span>
]
@ -1089,6 +1090,7 @@ and optional references to the superclass.</p>
o <span class="hljs-string">'Value OptFuncExist String'</span>, <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> TaggedTemplateCall $<span class="hljs-number">1</span>, $<span class="hljs-number">3</span>, $<span class="hljs-number">2</span>
o <span class="hljs-string">'Value OptFuncExist Arguments'</span>, <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> Call $<span class="hljs-number">1</span>, $<span class="hljs-number">3</span>, $<span class="hljs-number">2</span>
o <span class="hljs-string">'SUPER OptFuncExist Arguments'</span>, <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> SuperCall LOC(<span class="hljs-number">1</span>)(<span class="hljs-keyword">new</span> Super), $<span class="hljs-number">3</span>, $<span class="hljs-number">2</span>, $<span class="hljs-number">1</span>
o <span class="hljs-string">'DYNAMIC_IMPORT Arguments'</span>, <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> DynamicImportCall LOC(<span class="hljs-number">1</span>)(<span class="hljs-keyword">new</span> DynamicImport), $<span class="hljs-number">2</span>
]</pre></div></div>
</li>
@ -1850,7 +1852,7 @@ down. Following these rules is what makes <code>2 + 3 * 4</code> parse as:</p>
[<span class="hljs-string">'right'</span>, <span class="hljs-string">'YIELD'</span>]
[<span class="hljs-string">'right'</span>, <span class="hljs-string">'='</span>, <span class="hljs-string">':'</span>, <span class="hljs-string">'COMPOUND_ASSIGN'</span>, <span class="hljs-string">'RETURN'</span>, <span class="hljs-string">'THROW'</span>, <span class="hljs-string">'EXTENDS'</span>]
[<span class="hljs-string">'right'</span>, <span class="hljs-string">'FORIN'</span>, <span class="hljs-string">'FOROF'</span>, <span class="hljs-string">'FORFROM'</span>, <span class="hljs-string">'BY'</span>, <span class="hljs-string">'WHEN'</span>]
[<span class="hljs-string">'right'</span>, <span class="hljs-string">'IF'</span>, <span class="hljs-string">'ELSE'</span>, <span class="hljs-string">'FOR'</span>, <span class="hljs-string">'WHILE'</span>, <span class="hljs-string">'UNTIL'</span>, <span class="hljs-string">'LOOP'</span>, <span class="hljs-string">'SUPER'</span>, <span class="hljs-string">'CLASS'</span>, <span class="hljs-string">'IMPORT'</span>, <span class="hljs-string">'EXPORT'</span>]
[<span class="hljs-string">'right'</span>, <span class="hljs-string">'IF'</span>, <span class="hljs-string">'ELSE'</span>, <span class="hljs-string">'FOR'</span>, <span class="hljs-string">'WHILE'</span>, <span class="hljs-string">'UNTIL'</span>, <span class="hljs-string">'LOOP'</span>, <span class="hljs-string">'SUPER'</span>, <span class="hljs-string">'CLASS'</span>, <span class="hljs-string">'IMPORT'</span>, <span class="hljs-string">'EXPORT'</span>, <span class="hljs-string">'DYNAMIC_IMPORT'</span>]
[<span class="hljs-string">'left'</span>, <span class="hljs-string">'POST_IF'</span>]
]</pre></div></div>

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@ -403,8 +403,7 @@ CoffeeScript.register = <span class="hljs-function">-&gt;</span> <span class="hl
Use CoffeeScript.register() or require the coffeescript/register module to require <span class="hljs-subst">#{ext}</span> files.
"""</span>
CoffeeScript._compileFile = <span class="hljs-function"><span class="hljs-params">(filename, options = {})</span> -&gt;</span>
raw = fs.readFileSync filename, <span class="hljs-string">'utf8'</span></pre></div></div>
CoffeeScript._compileRawFileContent = <span class="hljs-function"><span class="hljs-params">(raw, filename, options = {})</span> -&gt;</span></pre></div></div>
</li>
@ -450,6 +449,11 @@ information to error so it can be pretty-printed later.</p>
answer
CoffeeScript._compileFile = <span class="hljs-function"><span class="hljs-params">(filename, options = {})</span> -&gt;</span>
raw = fs.readFileSync filename, <span class="hljs-string">'utf8'</span>
CoffeeScript._compileRawFileContent raw, filename, options
<span class="hljs-built_in">module</span>.exports = CoffeeScript</pre></div></div>
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@ -1296,6 +1296,9 @@ parentheses that indicate a method call from regular parentheses, and so on.</p>
@error message, origin[<span class="hljs-number">2</span>] <span class="hljs-keyword">if</span> message
<span class="hljs-keyword">return</span> value.length <span class="hljs-keyword">if</span> skipToken
<span class="hljs-keyword">if</span> value <span class="hljs-keyword">is</span> <span class="hljs-string">'('</span> <span class="hljs-keyword">and</span> prev?[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'IMPORT'</span>
prev[<span class="hljs-number">0</span>] = <span class="hljs-string">'DYNAMIC_IMPORT'</span>
<span class="hljs-keyword">if</span> value <span class="hljs-keyword">is</span> <span class="hljs-string">'{'</span> <span class="hljs-keyword">and</span> @seenImport
@importSpecifierList = <span class="hljs-literal">yes</span>
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> @importSpecifierList <span class="hljs-keyword">and</span> value <span class="hljs-keyword">is</span> <span class="hljs-string">'}'</span>
@ -2270,8 +2273,7 @@ loop. Try to detect when <code>from</code> is a variable identifier and when it
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">isForFrom</span> = <span class="hljs-params">(prev)</span> -&gt;</span>
<span class="hljs-keyword">if</span> prev[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'IDENTIFIER'</span></pre></div></div>
<div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">isForFrom</span> = <span class="hljs-params">(prev)</span> -&gt;</span></pre></div></div>
</li>
@ -2282,13 +2284,12 @@ loop. Try to detect when <code>from</code> is a variable identifier and when it
<div class="pilwrap ">
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</div>
<p><code>for i from from</code>, <code>for from from iterable</code></p>
<p><code>for i from iterable</code></p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> prev[<span class="hljs-number">1</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'from'</span>
prev[<span class="hljs-number">1</span>][<span class="hljs-number">0</span>] = <span class="hljs-string">'IDENTIFIER'</span>
<span class="hljs-literal">yes</span></pre></div></div>
<div class="content"><div class='highlight'><pre> <span class="hljs-keyword">if</span> prev[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">'IDENTIFIER'</span>
<span class="hljs-literal">yes</span></pre></div></div>
</li>
@ -2299,21 +2300,6 @@ loop. Try to detect when <code>from</code> is a variable identifier and when it
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<p><code>for i from iterable</code></p>
</div>
<div class="content"><div class='highlight'><pre> <span class="hljs-literal">yes</span></pre></div></div>
</li>
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<p><code>for from…</code></p>
</div>
@ -2324,11 +2310,11 @@ loop. Try to detect when <code>from</code> is a variable identifier and when it
</li>
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<p><code>for {from}…</code>, <code>for [from]…</code>, <code>for {a, from}…</code>, <code>for {a: from}…</code></p>
@ -2342,14 +2328,26 @@ loop. Try to detect when <code>from</code> is a variable identifier and when it
</li>
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<h2 id="constants">Constants</h2>
</div>
</li>
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<h2 id="constants">Constants</h2>
</div>
</li>
@ -2361,18 +2359,6 @@ loop. Try to detect when <code>from</code> is a variable identifier and when it
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</li>
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<p>Keywords that CoffeeScript shares in common with JavaScript.</p>
</div>
@ -2389,11 +2375,11 @@ loop. Try to detect when <code>from</code> is a variable identifier and when it
</li>
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<p>CoffeeScript-only keywords.</p>
@ -2421,11 +2407,11 @@ COFFEE_KEYWORDS = COFFEE_KEYWORDS.concat COFFEE_ALIASES</pre></div></div>
</li>
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<p>The list of keywords that are reserved by JavaScript, but not used, or are
used by CoffeeScript internally. We throw an error when these are encountered,
@ -2444,11 +2430,11 @@ STRICT_PROSCRIBED = [<span class="hljs-string">'arguments'</span>, <span class="
</li>
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<p>The superset of both JavaScript keywords and reserved words, none of which may
be used as identifiers or properties.</p>
@ -2460,11 +2446,11 @@ be used as identifiers or properties.</p>
</li>
<li id="section-98">
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<p>The character code of the nasty Microsoft madness otherwise known as the BOM.</p>
@ -2475,11 +2461,11 @@ be used as identifiers or properties.</p>
</li>
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<li id="section-98">
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<p>Token matching regexes.</p>
@ -2499,11 +2485,11 @@ CSX_IDENTIFIER = <span class="hljs-regexp">/// ^
</li>
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<p>Fragment: &lt;&gt;&lt;/&gt;</p>
@ -2550,11 +2536,11 @@ HERE_JSTOKEN = <span class="hljs-regexp">///^ ``` ((?: [^`\\] | \\[\s\S] | `
</li>
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<p>String-matching-regexes.</p>
@ -2588,11 +2574,11 @@ HEREDOC_INDENT = <span class="hljs-regexp">/\n+([^\n\S]*)(?=\S)/g</span></pr
</li>
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<p>Regex-matching-regexes.</p>
@ -2618,11 +2604,11 @@ HEREGEX = <span class="hljs-regexp">/// ^
</li>
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<p>Match any character, except those that need special handling below.</p>
@ -2633,11 +2619,11 @@ HEREGEX = <span class="hljs-regexp">/// ^
</li>
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<p>Match <code>\</code> followed by any character.</p>
@ -2648,11 +2634,11 @@ HEREGEX = <span class="hljs-regexp">/// ^
</li>
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<p>Match any <code>/</code> except <code>///</code>.</p>
@ -2663,11 +2649,11 @@ HEREGEX = <span class="hljs-regexp">/// ^
</li>
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<p>Match <code>#</code> which is not part of interpolation, e.g. <code>#{}</code>.</p>
@ -2678,11 +2664,11 @@ HEREGEX = <span class="hljs-regexp">/// ^
</li>
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<p>Comments consume everything until the end of the line, including <code>///</code>.</p>
@ -2705,11 +2691,11 @@ POSSIBLY_DIVISION = <span class="hljs-regexp">/// ^ /=?\s ///</span></pre></di
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<p>Other regexes.</p>
@ -2752,11 +2738,11 @@ TRAILING_SPACES = <span class="hljs-regexp">/\s+$/</span></pre></div></div>
</li>
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<p>Compound assignment tokens.</p>
@ -2770,11 +2756,11 @@ TRAILING_SPACES = <span class="hljs-regexp">/\s+$/</span></pre></div></div>
</li>
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<p>Unary tokens.</p>
@ -2787,11 +2773,11 @@ UNARY_MATH = [<span class="hljs-string">'!'</span>, <span class="hljs-string">'~
</li>
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<p>Bit-shifting tokens.</p>
@ -2802,11 +2788,11 @@ UNARY_MATH = [<span class="hljs-string">'!'</span>, <span class="hljs-string">'~
</li>
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<p>Comparison tokens.</p>
@ -2817,11 +2803,11 @@ UNARY_MATH = [<span class="hljs-string">'!'</span>, <span class="hljs-string">'~
</li>
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<p>Mathematical tokens.</p>
@ -2832,11 +2818,11 @@ UNARY_MATH = [<span class="hljs-string">'!'</span>, <span class="hljs-string">'~
</li>
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<p>Relational tokens that are negatable with <code>not</code> prefix.</p>
@ -2847,11 +2833,11 @@ UNARY_MATH = [<span class="hljs-string">'!'</span>, <span class="hljs-string">'~
</li>
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<p>Boolean tokens.</p>
@ -2862,11 +2848,11 @@ UNARY_MATH = [<span class="hljs-string">'!'</span>, <span class="hljs-string">'~
</li>
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<p>Tokens which could legitimately be invoked or indexed. An opening
parentheses or bracket following these tokens will be recorded as the start
@ -2874,7 +2860,7 @@ of a function invocation or indexing operation.</p>
</div>
<div class="content"><div class='highlight'><pre>CALLABLE = [<span class="hljs-string">'IDENTIFIER'</span>, <span class="hljs-string">'PROPERTY'</span>, <span class="hljs-string">')'</span>, <span class="hljs-string">']'</span>, <span class="hljs-string">'?'</span>, <span class="hljs-string">'@'</span>, <span class="hljs-string">'THIS'</span>, <span class="hljs-string">'SUPER'</span>]
<div class="content"><div class='highlight'><pre>CALLABLE = [<span class="hljs-string">'IDENTIFIER'</span>, <span class="hljs-string">'PROPERTY'</span>, <span class="hljs-string">')'</span>, <span class="hljs-string">']'</span>, <span class="hljs-string">'?'</span>, <span class="hljs-string">'@'</span>, <span class="hljs-string">'THIS'</span>, <span class="hljs-string">'SUPER'</span>, <span class="hljs-string">'DYNAMIC_IMPORT'</span>]
INDEXABLE = CALLABLE.concat [
<span class="hljs-string">'NUMBER'</span>, <span class="hljs-string">'INFINITY'</span>, <span class="hljs-string">'NAN'</span>, <span class="hljs-string">'STRING'</span>, <span class="hljs-string">'STRING_END'</span>, <span class="hljs-string">'REGEX'</span>, <span class="hljs-string">'REGEX_END'</span>
<span class="hljs-string">'BOOL'</span>, <span class="hljs-string">'NULL'</span>, <span class="hljs-string">'UNDEFINED'</span>, <span class="hljs-string">'}'</span>, <span class="hljs-string">'::'</span>
@ -2883,11 +2869,11 @@ INDEXABLE = CALLABLE.concat [
</li>
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<p>Tokens which can be the left-hand side of a less-than comparison, i.e. <code>a&lt;b</code>.</p>
@ -2898,11 +2884,11 @@ INDEXABLE = CALLABLE.concat [
</li>
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<p>Tokens which a regular expression will never immediately follow (except spaced
CALLABLEs in some cases), but which a division operator can.</p>
@ -2915,11 +2901,11 @@ CALLABLEs in some cases), but which a division operator can.</p>
</li>
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<p>Tokens that, when immediately preceding a <code>WHEN</code>, indicate that the <code>WHEN</code>
occurs at the start of a line. We disambiguate these from trailing whens to
@ -2932,11 +2918,11 @@ avoid an ambiguity in the grammar.</p>
</li>
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<p>Additional indent in front of these is ignored.</p>
@ -2947,11 +2933,11 @@ avoid an ambiguity in the grammar.</p>
</li>
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<p>Tokens that, when appearing at the end of a line, suppress a following TERMINATOR/INDENT token</p>

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@ -542,7 +542,7 @@ the two values are raw nodes which have not been compiled.</p>
</div>
<p>Occasionally it may be useful to make an expression behave as if it was ‘hoisted’, whereby the
result of the expression is available before its location in the source, but the expression’s
variable scope corresponds the source position. This is used extensively to deal with executable
variable scope corresponds to the source position. This is used extensively to deal with executable
class bodies in classes.</p>
<p>Calling this method mutates the node, proxying the <code>compileNode</code> and <code>compileToFragments</code>
methods to store their result for later replacing the <code>target</code> node, which is returned by the
@ -3479,7 +3479,8 @@ are too.</p>
compileNode: <span class="hljs-function"><span class="hljs-params">(o)</span> -&gt;</span>
<span class="hljs-keyword">return</span> [@makeCode <span class="hljs-string">'[]'</span>] <span class="hljs-keyword">unless</span> @objects.length
o.indent += TAB
<span class="hljs-function"> <span class="hljs-title">fragmentIsElision</span> = <span class="hljs-params">(fragment)</span> -&gt;</span> fragmentsToText(fragment).trim() <span class="hljs-keyword">is</span> <span class="hljs-string">','</span></pre></div></div>
<span class="hljs-function"> <span class="hljs-title">fragmentIsElision</span> = <span class="hljs-params">([ fragment ])</span> -&gt;</span>
fragment.type <span class="hljs-keyword">is</span> <span class="hljs-string">'Elision'</span> <span class="hljs-keyword">and</span> fragment.code.trim() <span class="hljs-keyword">is</span> <span class="hljs-string">','</span></pre></div></div>
</li>
@ -3490,7 +3491,7 @@ are too.</p>
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<p>Detect if <code>Elisions</code> at the beginning of the array are processed (e.g. [, , , a]).</p>
<p>Detect if <code>Elision</code>s at the beginning of the array are processed (e.g. [, , , a]).</p>
</div>
@ -3587,7 +3588,7 @@ element isn’t <code>Elision</code> or last element is <code>Elision</code> (e.
<span class="hljs-keyword">for</span> fragment, fragmentIndex <span class="hljs-keyword">in</span> answer
<span class="hljs-keyword">if</span> fragment.isHereComment
fragment.code = <span class="hljs-string">"<span class="hljs-subst">#{multident(fragment.code, o.indent, <span class="hljs-literal">no</span>)}</span>\n<span class="hljs-subst">#{o.indent}</span>"</span>
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> fragment.code <span class="hljs-keyword">is</span> <span class="hljs-string">', '</span> <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> fragment?.isElision
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> fragment.code <span class="hljs-keyword">is</span> <span class="hljs-string">', '</span> <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> fragment?.isElision <span class="hljs-keyword">and</span> fragment.type <span class="hljs-keyword">isnt</span> <span class="hljs-string">'StringLiteral'</span>
fragment.code = <span class="hljs-string">",\n<span class="hljs-subst">#{o.indent}</span>"</span>
answer.unshift @makeCode <span class="hljs-string">"[\n<span class="hljs-subst">#{o.indent}</span>"</span>
answer.push @makeCode <span class="hljs-string">"\n<span class="hljs-subst">#{@tab}</span>]"</span>
@ -3996,7 +3997,7 @@ exports.ExecutableClassBody = <span class="hljs-class"><span class="hljs-keyword
@body.traverseChildren <span class="hljs-literal">false</span>, <span class="hljs-function"><span class="hljs-params">(node)</span> =&gt;</span>
<span class="hljs-keyword">if</span> node <span class="hljs-keyword">instanceof</span> ThisLiteral
node.value = @name
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> node <span class="hljs-keyword">instanceof</span> Code <span class="hljs-keyword">and</span> node.bound <span class="hljs-keyword">and</span> node.isStatic
<span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> node <span class="hljs-keyword">instanceof</span> Code <span class="hljs-keyword">and</span> node.bound <span class="hljs-keyword">and</span> (node.isStatic <span class="hljs-keyword">or</span> <span class="hljs-keyword">not</span> node.name)
node.context = @name</pre></div></div>
</li>
@ -4251,7 +4252,17 @@ exports.ImportNamespaceSpecifier = <span class="hljs-class"><span class="hljs-ke
exports.ExportSpecifier = <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ExportSpecifier</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">ModuleSpecifier</span></span>
constructor: <span class="hljs-function"><span class="hljs-params">(local, exported)</span> -&gt;</span>
<span class="hljs-keyword">super</span> local, exported, <span class="hljs-string">'export'</span></pre></div></div>
<span class="hljs-keyword">super</span> local, exported, <span class="hljs-string">'export'</span>
exports.DynamicImport = <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">DynamicImport</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Base</span></span>
compileNode: <span class="hljs-function">-&gt;</span>
[@makeCode <span class="hljs-string">'import'</span>]
exports.DynamicImportCall = <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">DynamicImportCall</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Call</span></span>
compileNode: <span class="hljs-function"><span class="hljs-params">(o)</span> -&gt;</span>
<span class="hljs-keyword">unless</span> @args.length <span class="hljs-keyword">is</span> <span class="hljs-number">1</span>
@error <span class="hljs-string">'import() requires exactly one argument'</span>
<span class="hljs-keyword">super</span> o</pre></div></div>
</li>
@ -5582,7 +5593,7 @@ This is usually caught via <code>Op::compileContinuation</code>, but double-chec
</div>
<div class="content"><div class='highlight'><pre> scopeVariablesCount = o.scope.variables.length
signature.push param.compileToFragments(o)...
signature.push param.compileToFragments(o, LEVEL_PAREN)...
<span class="hljs-keyword">if</span> scopeVariablesCount <span class="hljs-keyword">isnt</span> o.scope.variables.length
generatedVariables = o.scope.variables.splice scopeVariablesCount
o.scope.parent.variables.push generatedVariables...

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docs/v2/index.html
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89
docs/v2/test.html
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@ -3,7 +3,12 @@
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>CoffeeScript Test Suite</title>
<script src="browser-compiler/coffeescript.js"></script>
<script nomodule src="browser-compiler/coffeescript.js"></script>
<script type="module">
import CoffeeScript from './browser-compiler-modern/coffeescript.js';
window.CoffeeScript = CoffeeScript;
window.addEventListener('DOMContentLoaded', CoffeeScript.runScripts, false);
</script>
<script src="https://cdn.jsdelivr.net/underscorejs/1.8.3/underscore-min.js"></script>
<style>
body, pre {
@ -452,6 +457,12 @@ test "array elisions nested destructuring", ->
deepEqual d, {x:2}
arrayEq w, [1,2,4]
test "#5112: array elisions not detected inside strings", ->
arr = [
str: ", #{3}"
]
eq arr[0].str, ', 3'
# Splats in Array Literals
test "array splat expansions with assignments", ->
@ -3546,6 +3557,19 @@ test "#4609: Support new.target", ->
new Foo()
eq newTarget, yes
test "#5085: Bug: @ reference to class not maintained in do block", ->
thisFoo = 'initial foo'
thisBar = 'initial bar'
fn = (o) -> o.bar()
class A
@foo = 'foo assigned in class'
do => thisFoo = @foo
fn bar: => thisBar = @foo
eq thisFoo, 'foo assigned in class'
eq thisBar, 'foo assigned in class'
</script>
<script type="text/x-coffeescript" class="test" id="cluster">
# Cluster Module
@ -9580,6 +9604,32 @@ test "`new.target` is only allowed meta property", ->
^^^^^^^^^^^^^
'''
test "#4834: dynamic import requires exactly one argument", ->
assertErrorFormat '''
import()
''', '''
[stdin]:1:1: error: import() requires exactly one argument
import()
^^^^^^^^
'''
assertErrorFormat '''
import('x', {})
''', '''
[stdin]:1:1: error: import() requires exactly one argument
import('x', {})
^^^^^^^^^^^^^^^
'''
test "#4834: dynamic import requires explicit call parentheses", ->
assertErrorFormat '''
promise = import 'foo'
''', '''
[stdin]:1:23: error: unexpected end of input
promise = import 'foo'
^
'''
</script>
<script type="text/x-coffeescript" class="test" id="eval">
if vm = require? 'vm'
@ -11724,6 +11774,10 @@ test "#4657: destructured array parameters", ->
arrayEq result.a, [1, 2, 3]
eq result.b, 4
test "#5128: default parameters of function in binary operation", ->
foo = yes or (a, b = {}) -> null
eq foo, yes
</script>
<script type="text/x-coffeescript" class="test" id="generators">
# Generators
@ -14443,6 +14497,27 @@ test "#4874: backslash `export`", ->
} from 'underscore';
"""
test "#4834: dynamic import", ->
eqJS """
import('module').then ->
""",
"""
import('module').then(function() {});
"""
eqJS """
foo = ->
bar = await import('bar')
""",
"""
var foo;
foo = async function() {
var bar;
return bar = (await import('bar'));
};
"""
</script>
<script type="text/x-coffeescript" class="test" id="numbers">
# Number Literals
@ -14957,6 +15032,16 @@ test "#4673: complex destructured object spread variables", ->
eq @y.b, 1
g b: 1
test "#4834: dynamic import can technically be object spread", ->
eqJS """
x = {...import('module')}
""",
"""
var x;
x = {...import('module')};
"""
</script>
<script type="text/x-coffeescript" class="test" id="objects">
# Object Literals
@ -17138,7 +17223,7 @@ ctrlV = { ctrl: true, name: 'v'}
testRepl 'reads history file', (input, output, repl) ->
input.emitLine repl.rli.history[0]
input.emitLine repl.history[0]
eq '3', output.lastWrite()
testRepl "starts with coffee prompt", (input, output) ->

10
documentation/examples/dynamic_import.coffee Normal file
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@ -0,0 +1,10 @@
# Your browser must support dynamic import to run this example.
do ->
{ run } = await import('./browser-compiler-modern/coffeescript.js')
run '''
if 5 < new Date().getHours() < 9
alert 'Time to make the coffee!'
else
alert 'Time to get some work done.'
'''

2
documentation/examples/modules.coffee
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@ -1,4 +1,4 @@
import 'local-file.coffee'
import './local-file.coffee'
import 'coffeescript'
import _ from 'underscore'

4
documentation/sections/contributing.md
View File

@ -2,7 +2,7 @@
Contributions are welcome! Feel free to fork [the repo](https://github.com/jashkenas/coffeescript) and submit a pull request.
[Some features of ECMAScript are intentionally unsupported](#unsupported). Please review both the open and closed [issues on GitHub](https://github.com/jashkenas/coffeescript/issues) to see if the feature you’re looking for has already been discussed. As a general rule, we don’t support ECMAScript syntax for features that aren’t yet finalized (at Stage 4 in the proposal approval process).
[Some features of ECMAScript are intentionally unsupported](#unsupported). Please review both the open and closed [issues on GitHub](https://github.com/jashkenas/coffeescript/issues) to see if the feature you’re looking for has already been discussed. As a general rule, we don’t support ECMAScript syntax for features that aren’t yet finalized (at Stage 4 in the [proposal approval process](https://github.com/tc39/proposals)) or implemented in major browsers and/or Node (which can sometimes happen for features in Stage 3). Any Stage 3 features that CoffeeScript chooses to support should be considered experimental, subject to breaking changes or removal until the feature reaches Stage 4.
For more resources on adding to CoffeeScript, please see [the Wiki](https://github.com/jashkenas/coffeescript/wiki/%5BHowto%5D-Hacking-on-the-CoffeeScript-Compiler), especially [How The Parser Works](https://github.com/jashkenas/coffeescript/wiki/%5BHowTo%5D-How-parsing-works).
@ -10,7 +10,7 @@ There are several things you can do to increase your odds of having your pull re
* Create tests! Any pull request should probably include basic tests to verify you didn’t break anything, or future changes won’t break your code.
* Follow the style of the rest of the CoffeeScript codebase.
* Ensure any ECMAScript syntax is mature (at Stage 4), with no further potential changes.
* Ensure any ECMAScript syntax is mature (at Stage 4, or at Stage 3 with support in major browsers or runtimes).
* Add only features that have broad utility, rather than a feature aimed at a specific use case or framework.
Of course, it’s entirely possible that you have a great addition, but it doesn’t fit within these constraints. Feel free to roll your own solution; you will have [plenty of company](https://github.com/jashkenas/coffeescript/wiki/In-The-Wild).

6
documentation/sections/modules.md
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@ -6,6 +6,12 @@ ES2015 modules are supported in CoffeeScript, with very similar `import` and `ex
codeFor('modules')
```
[Dynamic import](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#Dynamic_Imports) is also supported, with mandatory parentheses:
```
codeFor('dynamic_import', true)
```
<div id="modules-note" class="bookmark"></div>
Note that the CoffeeScript compiler **does not resolve modules**; writing an `import` or `export` statement in CoffeeScript will produce an `import` or `export` statement in the resulting output. It is your responsibility to [transpile](#transpilation) this ES2015 syntax into code that will work in your target runtimes.

11
documentation/site/scripts.html
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@ -1,9 +1,14 @@
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js" integrity="sha384-xBuQ/xzmlsLoJpyjoggmTEz8OWUFM0/RC5BsqQBDX2v5cMvDHcMakNTNrHIW2I5f" crossorigin="anonymous"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js" integrity="sha384-tsQFqpEReu7ZLhBV2VZlAu7zcOV+rXbYlF2cqB8txI/8aZajjp4Bqd+V6D5IgvKT" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js" integrity="sha384-uefMccjFJAIv6A+rW+L4AHf99KvxDjWSu1z9VI8SKNVmz4sk7buKt/6v9KI65qnm" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/combine/npm/codemirror@5.37.0/lib/codemirror.js,npm/codemirror@5.37.0/mode/coffeescript/coffeescript.js,npm/codemirror@5.37.0/addon/lint/coffeescript-lint.js,npm/codemirror@5.37.0/mode/javascript/javascript.js"></script>
<script src="browser-compiler/coffeescript.js"></script>
<script>
<script nomodule src="./browser-compiler/coffeescript.js"></script>
<script nomodule>
<%= includeScript('docs.coffee') %>
</script>
<script type="module">
import CoffeeScript from './browser-compiler-modern/coffeescript.js';
<%= includeScript('docs.coffee') %>
</script>
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-106156830-1"></script>

7
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@ -3,7 +3,12 @@
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>CoffeeScript Test Suite</title>
<script src="browser-compiler/coffeescript.js"></script>
<script nomodule src="browser-compiler/coffeescript.js"></script>
<script type="module">
import CoffeeScript from './browser-compiler-modern/coffeescript.js';
window.CoffeeScript = CoffeeScript;
window.addEventListener('DOMContentLoaded', CoffeeScript.runScripts, false);
</script>
<script src="https://cdn.jsdelivr.net/underscorejs/1.8.3/underscore-min.js"></script>
<style>
body, pre {

18
lib/coffeescript/browser.js
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@ -4,7 +4,7 @@
// to make things work smoothly when compiling code directly in the browser.
// We add support for loading remote Coffee scripts via **XHR**, and
// `text/coffeescript` script tags, source maps via data-URLs, and so on.
var CoffeeScript, compile, runScripts,
var CoffeeScript, compile,
indexOf = [].indexOf;
CoffeeScript = require('./coffeescript');
@ -81,7 +81,7 @@
// Activate CoffeeScript in the browser by having it compile and evaluate
// all script tags with a content-type of `text/coffeescript`.
// This happens on page load.
runScripts = function() {
CoffeeScript.runScripts = function() {
var coffees, coffeetypes, execute, i, index, j, len, s, script, scripts;
scripts = window.document.getElementsByTagName('script');
coffeetypes = ['text/coffeescript', 'text/literate-coffeescript'];
@ -136,10 +136,16 @@
};
// Listen for window load, both in decent browsers and in IE.
if (window.addEventListener) {
window.addEventListener('DOMContentLoaded', runScripts, false);
} else {
window.attachEvent('onload', runScripts);
// Only attach this event handler on startup for the
// non-ES module version of the browser compiler, to preserve
// backward compatibility while letting the ES module version
// be importable without side effects.
if (this === window) {
if (window.addEventListener) {
window.addEventListener('DOMContentLoaded', CoffeeScript.runScripts, false);
} else {
window.attachEvent('onload', CoffeeScript.runScripts);
}
}
}).call(this);

7
lib/coffeescript/lexer.js
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@ -1487,13 +1487,8 @@
// “sometimes” keyword.
isForFrom = function(prev) {
var ref;
// `for i from iterable`
if (prev[0] === 'IDENTIFIER') {
// `for i from from`, `for from from iterable`
if (prev[1] === 'from') {
prev[1][0] = 'IDENTIFIER';
true;
}
// `for i from iterable`
return true;
// `for from…`
} else if (prev[0] === 'FOR') {

1
package.json
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@ -17,6 +17,7 @@
"lib": "./lib/coffeescript"
},
"main": "./lib/coffeescript/index",
"module": "./docs/v2/browser-compiler-modern/coffeescript.js",
"browser": "./lib/coffeescript/browser",
"bin": {
"coffee": "./bin/coffee",

15
src/browser.coffee
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@ -58,7 +58,7 @@ CoffeeScript.load = (url, callback, options = {}, hold = false) ->
# Activate CoffeeScript in the browser by having it compile and evaluate
# all script tags with a content-type of `text/coffeescript`.
# This happens on page load.
runScripts = ->
CoffeeScript.runScripts = ->
scripts = window.document.getElementsByTagName 'script'
coffeetypes = ['text/coffeescript', 'text/literate-coffeescript']
coffees = (s for s in scripts when s.type in coffeetypes)
@ -96,7 +96,12 @@ runScripts = ->
execute()
# Listen for window load, both in decent browsers and in IE.
if window.addEventListener
window.addEventListener 'DOMContentLoaded', runScripts, no
else
window.attachEvent 'onload', runScripts
# Only attach this event handler on startup for the
# non-ES module version of the browser compiler, to preserve
# backward compatibility while letting the ES module version
# be importable without side effects.
if this is window
if window.addEventListener
window.addEventListener 'DOMContentLoaded', CoffeeScript.runScripts, no
else
window.attachEvent 'onload', CoffeeScript.runScripts

6
src/lexer.coffee
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@ -1112,12 +1112,8 @@ exports.isUnassignable = isUnassignable
# loop. Try to detect when `from` is a variable identifier and when it is this
# “sometimes” keyword.
isForFrom = (prev) ->
# `for i from iterable`
if prev[0] is 'IDENTIFIER'
# `for i from from`, `for from from iterable`
if prev[1] is 'from'
prev[1][0] = 'IDENTIFIER'
yes
# `for i from iterable`
yes
# `for from…`
else if prev[0] is 'FOR'