How to Extract AST of given Typescript code using the open source Typescript compiler code?

Basic code:

const fileNames = ["C:\\MyFile.ts"];const compilerOptions: ts.CompilerOptions = {    // compiler options go here if any...    // look at ts.CompilerOptions to see what's available};const program = ts.createProgram(fileNames, compilerOptions);const typeChecker = program.getTypeChecker();const sourceFiles = program.getSourceFiles();sourceFiles.filter(f => /MyFile\.ts$/.test(f.fileName)).forEach(sourceFile => {    ts.forEachChild(sourceFile, node => {        const declaration = node as ts.Declaration;        if (declaration.name) {            console.log(declaration.name.getText());        }    });});

So if you provided that with a C:\MyFile.ts like:

class MyClass {}interface MyInterface {}

It would output MyClass and MyInterface.

Figuring out everything beyond what I've just shown is a lot of work. It might be more beneficial for you to look at and/or help contribute to this work in progress.

TypeScript compiler doesn't support it but you can do it using recast and babylon@next. Although you will have to trust in the syntax defined by these technologies for representing TypeScript code AST and that they will keep up to date - since TypeScript has new language features release by release (short period of time) - is not like other languages (JavaScript) where you have well defined versions and released in a standard - so if your users start using new language features these technologies (mostly babylon) should keep up to date:

// npm install recast babylon@nextconst source = `interface I {  color: string}class C implements I{  color: string='blue'}`const recast = require('recast')const tsParser = require("recast/parsers/typescript")const ast = recast.parse(source, {  parser: tsParser});console.log(`CODE: ${source}AST: ${JSON.stringify(ast)}`);