TypeScript: get syntax tree

Question

I had read \"whole internet\", but can\'t find any examples about getting syntax tree (just like in Esprima) from TypeScrypt source. I mean how can i get object like this (E

Answer 1

I found recast to be working very good. Example:

var recast = require('recast');
var ast = recast.parse(`var answer = 6 * 7;`);
console.log(ast);

This will output all needed information and event TypeAnnotation, so this lib is really amazing :)

[
   {
      "type": "VariableDeclaration",
      "declarations": [
         {
            "type": "VariableDeclarator",
            "id": {
               "type": "Identifier",
               "name": "answer",
               "typeAnnotation": {
                  "type": "TypeAnnotation",
                  "typeAnnotation": {
                     "type": "NumberTypeAnnotation",
                     "loc": {
                        "start": {
                           "line": 1,
                           "column": 12
                        },
                        "end": {
                           "line": 1,
                           "column": 18
                        },
                        "lines": {},
                        "indent": 0
                     }
                  },
                  "loc": {
                     "start": {
                        "line": 1,
                        "column": 10
                     },
                     "end": {
                        "line": 1,
                        "column": 18
                     },
                     "lines": {},
                     "indent": 0
                  }
               },
               "loc": {
                  "start": {
                     "line": 1,
                     "column": 4
                  },
                  "end": {
                     "line": 1,
                     "column": 18
                  },
                  "lines": {},
                  "indent": 0
               }
            },
            "init": {
               "type": "BinaryExpression",
               "operator": "*",
               "left": {
                  "type": "Literal",
                  "value": 6,
                  "raw": "6",
                  "loc": {
                     "start": {
                        "line": 1,
                        "column": 21
                     },
                     "end": {
                        "line": 1,
                        "column": 22
                     },
                     "lines": {},
                     "indent": 0
                  }
               },
               "right": {
                  "type": "Literal",
                  "value": 7,
                  "raw": "7",
                  "loc": {
                     "start": {
                        "line": 1,
                        "column": 25
                     },
                     "end": {
                        "line": 1,
                        "column": 26
                     },
                     "lines": {},
                     "indent": 0
                  }
               },
               "loc": {
                  "start": {
                     "line": 1,
                     "column": 21
                  },
                  "end": {
                     "line": 1,
                     "column": 26
                  },
                  "lines": {},
                  "indent": 0
               }
            },
            "loc": {
               "start": {
                  "line": 1,
                  "column": 4
               },
               "end": {
                  "line": 1,
                  "column": 26
               },
               "lines": {},
               "indent": 0
            }
         }
      ],
      "kind": "var",
      "loc": {
         "start": {
            "line": 1,
            "column": 0
         },
         "end": {
            "line": 1,
            "column": 27
         },
         "lines": {},
         "indent": 0
      }
   }
]