Created
November 21, 2021 09:10
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import ts, { SyntaxKind } from "typescript"; | |
const source = ` | |
function fib(n: number): number { | |
if (n < 2) return n; | |
return fib(n - 2) + fib(n - 1); | |
} | |
console.log("foo"); | |
const n = 10; | |
const ret = fib(n); | |
console.log(\`fib(\${n}) = \${ret}\`); | |
`; | |
function transformerFactory<T extends ts.Node>(): ts.TransformerFactory<T> { | |
return (context) => { | |
const { factory } = context; | |
const transform: ts.Visitor = (node) => { | |
if ( | |
node.kind === SyntaxKind.CallExpression && | |
(node as ts.CallExpression).expression.getText() === "console.log" | |
) { | |
return factory.createVoidExpression(factory.createNumericLiteral("0")); | |
} | |
return ts.visitEachChild(node, (node) => transform(node), context); | |
}; | |
return (node: T) => ts.visitNode(node, transform); | |
}; | |
} | |
const result = ts.transpileModule(source, { | |
compilerOptions: { module: ts.ModuleKind.CommonJS }, | |
transformers: { before: [transformerFactory()] }, | |
}); | |
console.log(result.outputText); |
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