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Migration_guide.md

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Migration guide

Short guide to migrating from 0.x to 2.0.

Command line API

Most common usage patterns will continue to work:

js2coffee file.js
js2coffee file.js > output.coffee
cat file.js | js2coffee

➖ The following options have been deprecated and will no longer work:

  • --no-comments (disables comments) - comments are always enabled.

  • --show_src_lineno (show line numbers as comments) - not supported anymore.

  • --single_quotes (use single quotes) - this is now the default.

  • --verbose - exists in 2.0, but has a different meaning and only works with the new --ast flag.

  • -it (indent tab) - now changed to -i t or --indent tab

  • -i4 (indent 4 spacs) - now changed to -i 4 or --indent 4

➕ The --indent option will now accept new ways to indent:

  • --indent " " - indent by 4 spaces (compatible with js2coffee 0.x)
  • --indent 4 - indent by 4 spaces
  • --indent tab - indent by tab

JavaScript API (js2cofee.build())

js2coffee.build() invocation remains the same:

js2coffee.build("alert('hello')");
js2coffee.build("alert('hello')", { indent: '    ' });

➖ Some options have been deprecated and will no longer work:

  • single_quotes
  • no_comments
  • show_src_lineno

〰️ The return value of js2coffee.build() has changed:

var out = js2coffee.build("alert('hello')");

/* 0.x */
out == "alert 'hello'"

/* 2.0+ */
out.code     == "alert 'hello'"
out.warnings == [...]
out.ast      == { /* abstract syntax tree */ }
out.map      == { /* source map data */ }

〰️ The error format has also changed. See the Readme for more info.

Web distribution

The web distribution is now officially supported using the rawgit.com CDN. The previous versions in js2coffee.org will no longer be supported.

http://cdn.rawgit.com/js2coffee/js2coffee/v[VERSION]/dist/js2coffee.js

See the Readme file for the link to the latest version.