Typescript编译器API或语言服务获取函数参数类型

import * as ts from 'typescript';

function getFunctionParameterTypes(sourceCode: string, functionName: string): ts.Type[] {
  const sourceFile = ts.createSourceFile('temp.ts', sourceCode, ts.ScriptTarget.Latest);
  const parameterTypes: ts.Type[] = [];

  function visit(node: ts.Node) {
    if (ts.isFunctionDeclaration(node) && node.name && node.name.text === functionName) {
      ts.forEachChild(node, visit);
    } else if (ts.isParameter(node)) {
      const type = ts.getTypeAtLocation(node);
      parameterTypes.push(type);
    } else {
      ts.forEachChild(node, visit);
    }
  }

  visit(sourceFile);

  return parameterTypes;
}

// 示例用法
const sourceCode = `
function greet(name: string, age: number) {
  console.log('Hello, ' + name + '! You are ' + age + ' years old.');
}
`;

const parameterTypes = getFunctionParameterTypes(sourceCode, 'greet');
parameterTypes.forEach((type, index) => {
  console.log('Parameter', index + 1, 'type:', type.getFullText());
});