TypeScript Compiler API: from string to AST

Question

Is it possible to convert a string of TypeScript code snippet to AST node? In memory, without creating any a file.

David Sherret · Accepted Answer · 2020-02-29 05:39:28Z

12

Yes, use the ts.createSourceFile function:

import * as ts from "typescript";

const sourceFile = ts.createSourceFile(
    "file.ts",                  // filePath
    "function myFunction() {}", // fileText
    ts.ScriptTarget.Latest,     // scriptTarget
    true                        // setParentNodes -- sets the `parent` property
);

edited Feb 29, 2020 at 5:39

answered Feb 29, 2020 at 5:02

David Sherret

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2 Comments

ixam Over a year ago

I saw codes like this online but thought this would create a file 'file.ts'. After testing it locally I found this didn't create any file. The filePath parameter confused me, but it works now. Thanks!

David Sherret Over a year ago

Yeah, it won't create a file on the file system. It's used to set the SourceFile#fileName property and to help determine the ts.ScriptKind (which is the last optional parameter on this function).

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