是否需要一次文件并使用 function 参数传输它，还是每次在文件中都需要它？

Question

Which situation is the most efficiency?
file1.js

// Situation 1
const lang = require(`path/to/file/${value}`);
file2.run({ lang });
// Situation 2
const lang = value;
file2.run({ lang });

file2.js

// Situation 1
exports.run = runArgs => {
    const { lang } = runArgs;
    // lang has already the wanted value.
};
// Situation 2
exports.run = runArgs => {
    const { lang } = runArgs;
    const language = require(`path/to/file/${lang}`);
};

Answer 1

After a file got "required" once, Node caches it, all the other "requires" (from other files) will use the same cached value, so you should keep it simple and require the module from all the files that need it.

You can read more about it here and here