How to export dynamic variable in TypeScript

Question

I'm currently converting some code from Node JavaScript into TypeScript

I have a file called keys.js

let keys;
try {
  // eslint-disable-next-line security/detect-non-literal-fs-filename
  keys = JSON.parse(fs.readFileSync(credsPath, 'utf8'));
} catch (error) {
  return logger.error('initKeysParseError', error, { credsPath });
}

if (keys) {
  logger.info('initKeysSuccess', 'keys ready', null);

  return (module.exports.keys = keys);
}

return logger.error('initKeysError', null, { credsPath });

And when I wanted to use keys in another file, I would

const { keys } = require('./keys');
console.log(keys.account.username);

I'm having some issue doing this in typescript

How can I initialize the keys variable only once and then be able to do import keys from './keys';

?

Thanks!

Tuan Duc Vo · Accepted Answer · 2020-08-01 02:30:28Z

1

Haven't tried this but I think:

let keys;
try {
  // eslint-disable-next-line security/detect-non-literal-fs-filename
  keys = JSON.parse(fs.readFileSync(credsPath, 'utf8'));
  if (keys) {
    logger.info('initKeysSuccess', 'keys ready', null);
  } else {
    logger.error('initKeysError', null, { credsPath });
  }
} catch (error) {
  logger.error('initKeysParseError', error, { credsPath });
}

export { keys };

answered Aug 1, 2020 at 2:30

Tuan Duc Vo

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Comments

Slawa Eremin · Accepted Answer · 2020-08-01 00:56:01Z

1

I think, you should wrap your code in keys.js in some function

exports.getKeys = function() {
  let keys;

  try {
    // eslint-disable-next-line security/detect-non-literal-fs-filename
    keys = JSON.parse(fs.readFileSync(credsPath, 'utf8'));
  } catch (error) {
    logger.error('initKeysParseError', error, { credsPath });
  }

  if (keys) {
    logger.info('initKeysSuccess', 'keys ready', null);
    return keys;
  }

  logger.error('initKeysError', null, { credsPath })
  return keys;
}

const module = require('./keys.js')
const keys = module.getKeys();

and maybe you should switch to use esnext module with import ... from ... syntax, you can do that by changing tsconfig.json compilerOptions to "module": "esnext"

answered Aug 1, 2020 at 0:56

Slawa Eremin

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1 Comment

DanMossa Over a year ago

I like it! But is there a way to not also have to do the .getKeys() part?

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