TypeScript Compiler API usage from http://www.scottlogic.com/blog/2015/01/20/typescript-compiler-api.html

TypeScript_Compiler_API.js

// Blog post from Nicholas Wolverson
// http://www.scottlogic.com/blog/2015/01/20/typescript-compiler-api.html

function getCompilerOutput(text) {
    host.addFile(dummyScriptName, text);
    var output = languageService.getEmitOutput(dummyScriptName).outputFiles;
    return output && output.length > 0 ? output[0].text : "";
}
function getMatchingBracePosition(text, pos) {
    host.addFile(dummyScriptName, text);
    var braces = languageService.getBraceMatchingAtPosition(dummyScriptName, pos);
    return braces.map(function (b) { return b.start(); });
}
function getQuickInfo(text, pos) {
    host.addFile(dummyScriptName, text);
    var info = languageService.getQuickInfoAtPosition(dummyScriptName, pos);
    var text = info.displayParts.map(function (x) { return x.text; }).join("");
    return text;
}
function typeDecls(text) {
    host.addFile(dummyScriptName, text);
    var program = ts.createProgram([dummyScriptName], host.getCompilationSettings(), host);
    var typeChecker = program.getTypeChecker(true);
    var sf = program.getSourceFile(dummyScriptName);
    var decls = sf.getNamedDeclarations().map(function (nd) { return nd.symbol.name + ": " + typeChecker.typeToString(typeChecker.getTypeAtLocation(nd)); });
    return decls.join("\n");
}
function getNodes(sf) {
    var nodes = [];
    function allNodes(n) {
        ts.forEachChild(n, function (n) {
            nodes.push(n);
            allNodes(n);
            return false;
        });
    }
    ;
    allNodes(sf);
    return nodes;
}
function typeIdentifiers(text) {
    host.addFile(dummyScriptName, text);
    var program = ts.createProgram([dummyScriptName], host.getCompilationSettings(), host);
    var typeChecker = program.getTypeChecker(true);
    var sf = program.getSourceFile(dummyScriptName);
    var idNodes = getNodes(sf).filter(function (n) { return n.kind === 63 /* Identifier */; });
    var typed = idNodes.map(function (n) { return n.text + ": " + typeChecker.typeToString(typeChecker.getTypeAtLocation(n)); });
    return typed.join("\n");
}