es-guard/dist/lib/utils.js

A tool to check JavaScript compatibility with target environments

import * as fs from "fs";
import * as path from "path";
import stripJsonComments from "strip-json-comments";
/**
 * Helper to read and parse JSON file safely.
 * Supports JSON with comments (e.g. tsconfig.json).
 */
export const readJsonFile = (filePath) => {
    const content = fs.readFileSync(filePath, "utf-8");
    return JSON.parse(stripJsonComments(content, { trailingCommas: true }));
};
/**
 * Helper to read text file safely
 */
export const readTextFile = (filePath) => {
    return fs.readFileSync(filePath, "utf-8");
};
/**
 * Helper to safely evaluate JavaScript files (for config files)
 */
export const evaluateJsFile = (filePath) => {
    const content = readTextFile(filePath);
    // Create a safe evaluation context
    const module = { exports: {} };
    const require = (id) => {
        if (id === "path")
            return path;
        if (id === "fs")
            return fs;
        throw new Error(`Cannot require '${id}' in config evaluation`);
    };
    try {
        // Use Function constructor to create a safe evaluation environment
        const fn = new Function("module", "exports", "require", "path", "fs", "__dirname", content);
        fn(module, module.exports, require, path, fs, path.dirname(filePath));
        return module.exports;
    }
    catch (error) {
        console.warn(`Error evaluating ${filePath}:`, error);
        return null;
    }
};
/**
 * Type guard for package.json structure
 */
export const isPackageJson = (obj) => {
    return typeof obj === "object" && obj !== null;
};
/**
 * Type guard for tsconfig.json structure
 */
export const isTsConfig = (obj) => {
    return typeof obj === "object" && obj !== null && "compilerOptions" in obj;
};
/**
 * Type guard for .babelrc structure
 */
export const isBabelRc = (obj) => {
    return typeof obj === "object" && obj !== null && "presets" in obj;
};
/**
 * Type guard for vite config structure
 */
export const isViteConfig = (obj) => {
    return typeof obj === "object" && obj !== null;
};
/**
 * Type guard for webpack config structure
 */
export const isWebpackConfig = (obj) => {
    return typeof obj === "object" && obj !== null;
};
/**
 * Type guard for next.js config structure
 */
export const isNextConfig = (obj) => {
    return typeof obj === "object" && obj !== null;
};
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