Deno: yargs.env() fails #2136
Description
The following error is thrown after adding .env() to yargs when using Deno and deno run --allow-env ...:
error: Uncaught TypeError: Cannot convert undefined or null to object
Object.keys(env).forEach(function (envVar) {
^
at Function.keys (<anonymous>)
at applyEnvVars (https://deno.land/x/yargs_parser@v20.2.4-deno/build/lib/yargs-parser.js:661:20)
at YargsParser.parse (https://deno.land/x/yargs_parser@v20.2.4-deno/build/lib/yargs-parser.js:356:9)
at Function.yargsParser.detailed (https://deno.land/x/yargs_parser@v20.2.4-deno/deno.ts:32:17)
at YargsInstance.[runYargsParserAndExecuteCommands] (https://deno.land/x/yargs@v17.3.1-deno/build/lib/yargs-factory.js:1313:86)
at YargsInstance.parse (https://deno.land/x/yargs@v17.3.1-deno/build/lib/yargs-factory.js:692:63);
This error will occur even with the current Deno example in the readme:
import yargs from 'https://deno.land/x/yargs/deno.ts'
import { Arguments } from 'https://deno.land/x/yargs/deno-types.ts'
yargs(Deno.args)
.env() // <---- Adding .env() causes the error to throw.
.command('download <files...>', 'download a list of files', (yargs: any) => {
return yargs.positional('files', {
describe: 'a list of files to do something with'
})
}, (argv: Arguments) => {
console.info(argv)
})
.strictCommands()
.demandCommand(1)
.parse()