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Code Releases Activity

Option to transpile with Babel (#4697)

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* Upgrade Babeli (now babel-minify) which fixes the bug that was forcing us to run Babel twice for transpilation

* Add --transpile option (WIP)

* Node API always compiles a string, so it doesn’t need the option to pass a path to an options file, it can always just pass an object to `transpile`; get `transpile` working with `eval`

* Not allowing argument to `--transpile` so don’t need to cover so many cases

* Don’t need to worry about `sourceMaps` option to pass to Babel, `inputSourceMap` overrides it

* Rewrite Webpack test to use Node API

* Make the compiler safe again for browsers and Webpack/Browserify

* Node version of CoffeeScript.compile passes reference to Babel if transpile is requested

* Test Node API for transpile option

* Test for merged source maps

* Test for Node API error message

* Only stop searching for Babel options if a package.json has a truthy "babel" key

* Update docs
This commit is contained in:
Geoffrey Booth 2017-09-15 06:58:18 -07:00 • committed by GitHub
parent 970f31c292
commit f51c1a150b
21 changed files with 656 additions and 240 deletions
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30
lib/coffeescript/coffeescript.js
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@ -84,10 +84,10 @@
// in which case this returns a `{js, v3SourceMap, sourceMap}`
// object, where sourceMap is a sourcemap.coffee#SourceMap object, handy for
// doing programmatic lookups.
exports.compile = compile = withPrettyErrors(function(code, options) {
var currentColumn, currentLine, encoded, extend, filename, fragment, fragments, generateSourceMap, header, i, j, js, len, len1, map, merge, newLines, ref, ref1, sourceMapDataURI, sourceURL, token, tokens, v3SourceMap;
({merge, extend} = helpers);
options = extend({}, options);
exports.compile = compile = withPrettyErrors(function(code, options = {}) {
var currentColumn, currentLine, encoded, filename, fragment, fragments, generateSourceMap, header, i, j, js, len, len1, map, newLines, ref, ref1, sourceMapDataURI, sourceURL, token, tokens, transpiler, transpilerOutput, v3SourceMap;
// Clone `options`, to avoid mutating the `options` object passed in.
options = Object.assign({}, options);
// 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
// we need to recompile it to get a source map for `prepareStackTrace`.
@ -167,6 +167,28 @@
}
sourceMaps[filename].push(map);
}
if (options.transpile) {
if (typeof options.transpile !== 'object') {
// This only happens if run via the Node API and `transpile` is set to
// something other than an object.
throw new Error('The transpile option must be given an object with options to pass to Babel');
}
// Get the reference to Babel that we have been passed if this compiler
// is run via the CLI or Node API.
transpiler = options.transpile.transpile;
delete options.transpile.transpile;
// See https://github.com/babel/babel/issues/827#issuecomment-77573107:
// Babel can take a v3 source map object as input in `inputSourceMap`
// and it will return an *updated* v3 source map object in its output.
if (v3SourceMap && (options.transpile.inputSourceMap == null)) {
options.transpile.inputSourceMap = v3SourceMap;
}
transpilerOutput = transpiler(js, options.transpile);
js = transpilerOutput.code;
if (v3SourceMap && transpilerOutput.map) {
v3SourceMap = transpilerOutput.map;
}
}
if (options.inlineMap) {
encoded = base64encode(JSON.stringify(v3SourceMap));
sourceMapDataURI = `//# sourceMappingURL=data:application/json;base64,${encoded}`;