@itrocks/parameter-name/esm/parameter-name.js

Runtime parameter name reflection from TypeScript declaration files

import { readFileSync } from 'node:fs';
import ts from 'typescript';
export function parameterNamesFromFile(fileName, className, methodName) {
    const isMethod = (methodName === 'constructor')
        ? ts.isConstructorDeclaration
        : function (node) {
            return ts.isMethodDeclaration(node) && node.name && ts.isIdentifier(node.name) && (node.name.text === methodName);
        };
    const content = readFileSync(fileName.substring(0, fileName.lastIndexOf('.')) + '.d.ts', 'utf8');
    const sourceFile = ts.createSourceFile(fileName, content, ts.ScriptTarget.Latest, true);
    let propertyNames = new Array;
    function searchClass(node) {
        if (ts.isClassDeclaration(node)
            && node.name
            && ts.isIdentifier(node.name)
            && (node.name.text === className)) {
            return ts.forEachChild(node, searchMethod);
        }
        ts.forEachChild(node, searchClass);
    }
    function searchMethod(node) {
        if (isMethod(node)) {
            propertyNames = node.parameters.map(parameter => ts.isIdentifier(parameter.name) ? parameter.name.text : '');
        }
    }
    searchClass(sourceFile);
    return propertyNames;
}
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