metro/transformer.js

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/**
* Copyright 2004-present Facebook. All Rights Reserved.
*
* Note: This is a fork of the fb-specific transform.js
*/
'use strict';
var jstransform = require('jstransform').transform;
var reactVisitors =
require('react-tools/vendor/fbtransform/visitors').getAllVisitors();
var staticTypeSyntax =
require('jstransform/visitors/type-syntax').visitorList;
// Note that reactVisitors now handles ES6 classes, rest parameters, arrow
// functions, template strings, and object short notation.
var visitorList = reactVisitors;
function transform(srcTxt, filename) {
var options = {
es3: true,
sourceType: 'nonStrictModule',
filename: filename,
};
// These tranforms mostly just erase type annotations and static typing
// related statements, but they were conflicting with other tranforms.
// Running them first solves that problem
var staticTypeSyntaxResult = jstransform(
staticTypeSyntax,
srcTxt,
options
);
return jstransform(
visitorList,
staticTypeSyntaxResult.code,
options
);
}
module.exports = function(data, callback) {
var result;
try {
result = transform(
data.sourceCode,
data.filename
);
} catch (e) {
return callback(null, {
error: {
lineNumber: e.lineNumber,
column: e.column,
message: e.message,
stack: e.stack,
description: e.description
}
});
}
callback(null, result);
};
// export for use in jest
module.exports.transform = transform;