CODEWITHSUNDEEP
typescripttypescript-compiler-api
Arkadiusz Kałkus
Arkadiusz Kałkus

Reputation: 18363

How to ignore jsDoc while generating code using printNode function from Typescript compiler api?

Typescript compiler API allows us to process abstract syntax tree (AST) and generate source code. We can do it by creating a printer object and using printNode function

const printer = ts.createPrinter({ newLine: ts.NewLineKind.LineFeed });
printer.printNode(ts.EmitHint.Unspecified, node, sourceFile))

The problem I'm facing is that my AST contains lots of jsDoc in various places and I want to ignore them and print code without comments. Is there any way to do it without manually traversing the AST and removing jsDoc objects?

Upvotes: 0

Views: 247

Answers (1)

David Sherret
David Sherret

Reputation: 106640

Based on looking at the printer code (see shouldWriteComment and follow the code out of there) it doesn't seem possible out of the box.

One way you could hack this is to set the positions of all declarations that have jsdocs to be -1 or node.pos = node.getStart(sourceFile):

> ts.createPrinter({}).printNode(node, sourceFile)
'/** Test */\r\nfunction test() {\r\n    test;\r\n}\r\n'
> node.pos = -1
> ts.createPrinter({}).printNode(node, sourceFile)
'function test() {\r\n    test;\r\n}\r\n'

Upvotes: 1

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