Use TypeScript Compiler API Directly

In 1.4.0 we can use the TypeScript API directly to preprocess our files.
This lets us get rid of a dependency.

https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API

We can also use this to provide our default libraries so that we don't
need to keep the references in the test file.

Author: sebmarkbage

jest/preprocessor.js

@@ -3,28 +3,22 @@
 var ReactTools = require('../main.js');
 
 var coffee = require('coffee-script');
-var ts = require('ts-compiler');
+var tsPreprocessor = require('./ts-preprocessor');
+
+var defaultLibraries = [
+  require.resolve('./jest.d.ts'),
+  require.resolve('../src/modern/class/React.d.ts')
+];
+
+var ts = tsPreprocessor(defaultLibraries);
 
 module.exports = {
   process: function(src, path) {
     if (path.match(/\.coffee$/)) {
       return coffee.compile(src, {'bare': true});
     }
     if (path.match(/\.ts$/) && !path.match(/\.d\.ts$/)) {
-      ts.compile([path], {
-        skipWrite: true,
-        module: 'commonjs'
-      }, function(err, results) {
-        if (err) {
-          throw err;
-        }
-        results.forEach(function(file) {
-          // This is gross, but jest doesn't provide an asynchronous way to
-          // process a module, and ts currently runs syncronously.
-          src = file.text;
-        });
-      });
-      return src;
+      return ts.compile(src, path);
     }
     return ReactTools.transform(src, {harmony: true});
   }

jest/ts-preprocessor.js

@@ -0,0 +1,67 @@
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+var ts = require('typescript');
+
+var tsOptions = { module: 'commonjs' };
+
+function formatErrorMessage(error) {
+  return (
+    error.file.filename + '(' +
+    error.file.getLineAndCharacterFromPosition(error.start).line +
+    '): ' +
+    error.messageText
+  );
+}
+
+function compile(defaultLib, content, contentFilename) {
+  var output = null;
+  var compilerHost = {
+    getSourceFile: function(filename, languageVersion) {
+      if (filename === contentFilename) {
+        return ts.createSourceFile(filename, content, 'ES5', '0');
+      }
+      return defaultLib;
+    },
+    writeFile: function(name, text, writeByteOrderMark) {
+      if (output === null) {
+        output = text;
+      } else {
+        throw new Error('Expected only one dependency.');
+      }
+    },
+    getCanonicalFileName: function(filename) { return filename; },
+    getCurrentDirectory: function() { return ''; },
+    getNewLine: function() { return '\n'; }
+  };
+  var program = ts.createProgram([contentFilename], tsOptions, compilerHost);
+  var errors = program.getDiagnostics();
+  if (!errors.length) {
+    var checker = program.getTypeChecker(true);
+    errors = checker.getDiagnostics();
+    checker.emitFiles();
+  }
+  if (errors.length) {
+    throw new Error(errors.map(formatErrorMessage).join('\n'));
+  }
+  return output;
+}
+
+module.exports = function(defaultLibs) {
+  var defaultLibSource = fs.readFileSync(
+    path.join(path.dirname(require.resolve('typescript')), 'lib.d.ts')
+  );
+
+  for (var i = 0; i < defaultLibs.length; i++) {
+    defaultLibSource += '\n' + fs.readFileSync(defaultLibs[i]);
+  }
+
+  var defaultLibSourceFile = ts.createSourceFile(
+    'lib.d.ts', defaultLibSource, 'ES5'
+  );
+
+  return {
+    compile: compile.bind(null, defaultLibSourceFile)
+  };
+};

package.json

@@ -60,7 +60,7 @@
     "recast": "^0.9.11",
     "sauce-tunnel": "~1.1.0",
     "tmp": "~0.0.18",
-    "ts-compiler": "^2.0.0",
+    "typescript": "^1.4.0",
     "uglify-js": "~2.4.0",
     "uglifyify": "^2.4.0",
     "wd": "~0.2.6"

src/modern/class/__tests__/ReactTypeScriptClass-test.ts

@@ -7,9 +7,6 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
-///<reference path='../../../../jest/jest.d.ts'/>
-///<reference path='../React.d.ts'/>
-
 import React = require('React');
 
 // Before Each