Adding functions from typescript lib files to analysis

[michelledaviest]

Hello,

I want to be able to get the CallSignatureType for functions defined in the typescript lib files. I can't seem to get this to work. However, getting the getReturnTypeAnnotation seems to work for some functions. Please let me know how to add typescript lib files to my analysis so I can get call signatures consistently. Do I have to copy over the .d.ts files from the typescript source?

JavaScript file:

let x = BigInt.asUintN(64, 0); 

let cachedTextEncoder = new TextEncoder('utf-8');
let y = cachedTextEncoder.encode("hi")

The following CodeQL query returns no results:

from Function called_function, CallExpr call
where called_function.getName() = call.getCalleeName() 
select call, called_function.getCallSignature()

The following CodeQL query returns results for the cachedTextEncoder.encode call:

from Function called_function, CallExpr call
where called_function.getName() = call.getCalleeName() 
select call, called_function.getCallSignature()

I am building the codeql database as follows after running tsc --init in the directory with the js file I want to analyze.

codeql database create --language=javascript -- ql_db

Thank you!

[asgerf]

getCallSignature only has results for functions in TypeScript files, that is, files with the extension .ts or .tsx. Could you double check if the files have this extension?

[michelledaviest]

Yes, both have .ts files. The typescript source that has the call signature for

• BigInt.asUintN is here
• I can;t find the source for TextEncoder.encode - it shows up in the file util.d.ts under typescript's typing of node, but here is a link to the MDN docs.