b6cfba7cfbPR-URL: https://github.com/nodejs/node/pull/59750 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Jordan Harband <ljharb@gmail.com> Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
16 lines
616 B
JavaScript
16 lines
616 B
JavaScript
// replace any ${ENV} values with the appropriate environ.
|
|
// optional "?" modifier can be used like this: ${ENV?} so in case of the variable being not defined, it evaluates into empty string.
|
|
|
|
const envExpr = /(?<!\\)(\\*)\$\{([^${}?]+)(\?)?\}/g
|
|
|
|
module.exports = (f, env) => f.replace(envExpr, (orig, esc, name, modifier) => {
|
|
const fallback = modifier === '?' ? '' : `$\{${name}}`
|
|
const val = env[name] !== undefined ? env[name] : fallback
|
|
|
|
// consume the escape chars that are relevant.
|
|
if (esc.length % 2) {
|
|
return orig.slice((esc.length + 1) / 2)
|
|
}
|
|
|
|
return (esc.slice(esc.length / 2)) + val
|
|
})
|