file.js

[1,2,3].map(x => x * x)

macro.js

macro => {
  rule infix { ($value (,) ...) | {$body ...} } => {
    function($value (,) ...) {
      $body ...
    }.bind(this)
  }
  rule infix { ($value (,) ...) | $guard:expr } => {
    function($value (,) ...) {
      return $guard;
    }.bind(this)
  }
  rule infix { $param:ident | $guard:expr } => {
    function($param) {
      return $guard;
    }.bind(this)
  }
}

export =>

output.txt

$ git clone https://gist.github.com/91d9ff781a377729a468.git && cd 91d9ff781a377729a468
Cloning into '91d9ff781a377729a468'...
remote: Counting objects: 4, done.
remote: Compressing objects: 100% (3/3), done.
remote: Total 4 (delta 0), reused 0 (delta 0)
Unpacking objects: 100% (4/4), done.
Checking connectivity... done.
$ npm install git+ssh://git@github.com:mozilla/sweet.js.git
npm http GET https://registry.npmjs.org/escodegen
npm http GET https://registry.npmjs.org/optimist
npm http GET https://registry.npmjs.org/underscore
npm http GET https://registry.npmjs.org/escope
npm http GET https://registry.npmjs.org/resolve
npm http 304 https://registry.npmjs.org/escodegen
npm http 304 https://registry.npmjs.org/resolve
npm http 304 https://registry.npmjs.org/optimist
npm http 304 https://registry.npmjs.org/underscore
npm http 304 https://registry.npmjs.org/escope
npm http GET https://registry.npmjs.org/estraverse
npm http GET https://registry.npmjs.org/wordwrap
npm http GET https://registry.npmjs.org/esprima
npm http GET https://registry.npmjs.org/estraverse
npm http GET https://registry.npmjs.org/source-map
npm http GET https://registry.npmjs.org/esutils
npm http 304 https://registry.npmjs.org/source-map
npm http 304 https://registry.npmjs.org/estraverse
npm http 304 https://registry.npmjs.org/estraverse
npm http 304 https://registry.npmjs.org/wordwrap
npm http 304 https://registry.npmjs.org/esutils
npm http 304 https://registry.npmjs.org/esprima
npm http GET https://registry.npmjs.org/amdefine
npm http 304 https://registry.npmjs.org/amdefine
sweet.js@0.6.0 node_modules/sweet.js
├── resolve@0.6.3
├── underscore@1.3.3
├── escope@1.0.1 (estraverse@1.5.0)
├── optimist@0.3.7 (wordwrap@0.0.2)
└── escodegen@1.2.0 (estraverse@1.5.0, esutils@1.0.0, esprima@1.0.4, source-map@0.1.33)
$ ./node_modules/.bin/sjs --sourcemap --module ./macro.js file.js -o output.js

/private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-map-generator.js:269
        throw new Error('Invalid mapping: ' + JSON.stringify({
              ^
Error: Invalid mapping: {"generated":{"line":5,"column":16},"source":"file.js","original":{"line":1,"column":-295},"name":"x$532"}
    at SourceMapGenerator_validateMapping [as _validateMapping] (/private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-map-generator.js:269:15)
    at SourceMapGenerator_addMapping [as addMapping] (/private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-map-generator.js:102:12)
    at /private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-node.js:323:15
    at SourceNode_walk [as walk] (/private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-node.js:202:11)
    at SourceNode_walk [as walk] (/private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-node.js:198:15)
    at SourceNode_walk [as walk] (/private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-node.js:198:15)
    at SourceNode_walk [as walk] (/private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-node.js:198:15)
    at SourceNode_walk [as walk] (/private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-node.js:198:15)
    at SourceNode_walk [as walk] (/private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-node.js:198:15)
    at SourceNode_walk [as walk] (/private/tmp/91d9ff781a377729a468/node_modules/sweet.js/node_modules/escodegen/node_modules/source-map/lib/source-map/source-node.js:198:15)