How to use the isFunctionExpression function from typescript

Find comprehensive JavaScript typescript.isFunctionExpression code examples handpicked from public code repositorys.

typescript.isFunctionExpression is a function that checks whether a given AST node is a function expression or not.

core.js

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    return false
  }
}

const isArrowFunction = ts.isArrowFunction(node)
const isFunctionExpression = ts.isFunctionExpression(node)
// const isFunctionLike = ts.isFunctionLike(node)
const isVariFunctionNode = isVariableFunction(node)

if (isVariFunctionNode !== false) {

+ 3 other calls in file

How does typescript.isFunctionExpression work?

typescript.isFunctionExpression is a function provided by the TypeScript compiler API that checks whether a given node is a function expression node. In more detail, it takes a TypeScript Node object as input and returns a boolean value indicating whether the node represents a function expression. A function expression is a syntactic construct in JavaScript that defines an anonymous function and returns it as a value, which can be assigned to a variable or passed as an argument to another function. typescript.isFunctionExpression checks if the given node has a type of SyntaxKind.FunctionExpression, which represents a function expression node in the TypeScript abstract syntax tree.

Ai Example

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import ts from "typescript";

const code = "const sum = (a, b) => a + b;";
const sourceFile = ts.createSourceFile(
  "sample.ts",
  code,
  ts.ScriptTarget.ES2020,
  true
);

ts.forEachChild(sourceFile, (node) => {
  if (
    ts.isVariableDeclaration(node) &&
    ts.isFunctionExpression(node.initializer)
  ) {
    console.log("This is a variable declaration with a function expression");
  }
});

In this example, the typescript.isFunctionExpression function is used to check if a given node is a function expression. The ts.isVariableDeclaration function is used to check if the node is a variable declaration, and the ts.isFunctionExpression function is used to check if the initializer of the variable declaration is a function expression. If both conditions are true, the console will log "This is a variable declaration with a function expression".

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