Awesome, thanks @bcoe! I did some manual testing on this, and it looks good! I tested with the following config:

require('yargs')
    .env('YARGS')
    .option('x', {
        alias: ['ex', 'long-x']
    })
    .option('y', {
        alias: ['why', 'long-y']
    })
    .conflicts('x', 'why').argv;

and the following test script:

#!/bin/sh

node test.js -x && echo PASS
node test.js --x && echo PASS
node test.js --ex && echo PASS
node test.js --long-x && echo PASS

node test.js -x foo && echo PASS
node test.js --x foo && echo PASS
node test.js --ex foo && echo PASS
node test.js --long-x foo && echo PASS
YARGS_X=foo node test.js && echo PASS
YARGS_EX=foo node test.js && echo PASS
YARGS_LONG_X=foo node test.js && echo PASS

node test.js -y && echo PASS
node test.js --y && echo PASS
node test.js --why && echo PASS
node test.js --long-y && echo PASS

node test.js -y bar && echo PASS
node test.js --y bar && echo PASS
node test.js --why bar && echo PASS
node test.js --long-y bar && echo PASS
YARGS_Y=bar node test.js && echo PASS
YARGS_WHY=bar node test.js && echo PASS
YARGS_LONG_Y=bar node test.js && echo PASS

node test.js -x -y 2>/dev/null && echo FAIL || echo PASS
node test.js --x -y 2>/dev/null && echo FAIL || echo PASS
node test.js --ex -y 2>/dev/null && echo FAIL || echo PASS
node test.js --long-x -y 2>/dev/null && echo FAIL || echo PASS

node test.js -x --y 2>/dev/null && echo FAIL || echo PASS
node test.js --x --y 2>/dev/null && echo FAIL || echo PASS
node test.js --ex --y 2>/dev/null && echo FAIL || echo PASS
node test.js --long-x --y 2>/dev/null && echo FAIL || echo PASS

node test.js -x --why 2>/dev/null && echo FAIL || echo PASS
node test.js --x --why 2>/dev/null && echo FAIL || echo PASS
node test.js --ex --why 2>/dev/null && echo FAIL || echo PASS
node test.js --long-x --why 2>/dev/null && echo FAIL || echo PASS

node test.js -x --long-y 2>/dev/null && echo FAIL || echo PASS
node test.js --x --long-y 2>/dev/null && echo FAIL || echo PASS
node test.js --ex --long-y 2>/dev/null && echo FAIL || echo PASS
node test.js --long-x --long-y 2>/dev/null && echo FAIL || echo PASS


node test.js -y -x 2>/dev/null && echo FAIL || echo PASS
node test.js -y --x 2>/dev/null && echo FAIL || echo PASS
node test.js -y --ex 2>/dev/null && echo FAIL || echo PASS
node test.js -y --long-x 2>/dev/null && echo FAIL || echo PASS

node test.js --y -x 2>/dev/null && echo FAIL || echo PASS
node test.js --y --x 2>/dev/null && echo FAIL || echo PASS
node test.js --y --ex 2>/dev/null && echo FAIL || echo PASS
node test.js --y --long-x 2>/dev/null && echo FAIL || echo PASS

node test.js --why -x 2>/dev/null && echo FAIL || echo PASS
node test.js --why --x 2>/dev/null && echo FAIL || echo PASS
node test.js --why --ex 2>/dev/null && echo FAIL || echo PASS
node test.js --why --long-x 2>/dev/null && echo FAIL || echo PASS

node test.js --long-y -x 2>/dev/null && echo FAIL || echo PASS
node test.js --long-y --x 2>/dev/null && echo FAIL || echo PASS
node test.js --long-y --ex 2>/dev/null && echo FAIL || echo PASS
node test.js --long-y --long-x 2>/dev/null && echo FAIL || echo PASS

node test.js -x foo -y 2>/dev/null && echo FAIL || echo PASS
node test.js -x foo -y foo 2>/dev/null && echo FAIL || echo PASS
node test.js -x -y foo 2>/dev/null && echo FAIL || echo PASS

YARGS_X=foo YARGS_Y=bar node test.js 2>/dev/null && echo FAIL || echo PASS
YARGS_EX=foo YARGS_Y=bar node test.js 2>/dev/null && echo FAIL || echo PASS
YARGS_LONG_X=foo YARGS_Y=bar node test.js 2>/dev/null && echo FAIL || echo PASS

YARGS_X=foo YARGS_WHY=bar node test.js 2>/dev/null && echo FAIL || echo PASS
YARGS_EX=foo YARGS_WHY=bar node test.js 2>/dev/null && echo FAIL || echo PASS
YARGS_LONG_X=foo YARGS_WHY=bar node test.js 2>/dev/null && echo FAIL || echo PASS

YARGS_X=foo YARGS_LONG_Y=bar node test.js 2>/dev/null && echo FAIL || echo PASS
YARGS_EX=foo YARGS_LONG_Y=bar node test.js 2>/dev/null && echo FAIL || echo PASS
YARGS_LONG_X=foo YARGS_LONG_Y=bar node test.js 2>/dev/null && echo FAIL || echo PASS

If you can point me to the appropriate test file, I'd be happy to create a pull request with some unit tests for this if you don't already have them.

Support for exclusive arguments #189

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