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README.md

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+# TypeScript
+
+Scalable JavaScript development with types, classes and modules.
+
+## Install
+
+  npm install -g typescript
+
+## Usage
+
+  tsc hello.ts
+  
+
+## Build
+
+1.  Install Node if you haven't already (http://nodejs.org/)
+2.  Install Jake, the tool we use to build our compiler (https://github.com/mde/jake). To do this, run "npm install -g jake".
+3.  To use jake, run one of the following commands: 
+    - jake local - This builds the compiler. The output is in built/local in the public directory 
+    - jake clean - deletes the build compiler 
+    - jake LKG - This replaces the LKG (last known good) version of the compiler with the built one.
+        - This is a bootstrapping step to be executed whenever the built compiler reaches a stable state.
+    - jake tests - This builds the test infrastructure, using the built compiler. 
+    - jake runtests - This runs the tests, using the built compiler and built test infrastructure. 
+        - You can also override the host or specify a test for this command. Use host=<hostName> or tests=<testPath>. 
+    - jake baseline-accept - This replaces the baseline test results with the results obtained from jake runtests. 
+    - jake -T lists the above commands.