FilesExpand file tree

 master

/

stdio.js

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

41 lines (30 loc) · 891 Bytes

 master

/

stdio.js

Copy path

Top

File metadata and controls

• Code
• Blame

41 lines (30 loc) · 891 Bytes

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

'use strict';

const alias = ['stdin', 'stdout', 'stderr'];

const hasAlias = opts => alias.some(x => Boolean(opts[x]));

module.exports = opts => {

if (!opts) {

return null;

}

if (opts.stdio && hasAlias(opts)) {

throw new Error(`It's not possible to provide \`stdio\` in combination with one of ${alias.map(x => `\`${x}\``).join(', ')}`);

}

if (typeof opts.stdio === 'string') {

return opts.stdio;

}

const stdio = opts.stdio || [];

if (!Array.isArray(stdio)) {

throw new TypeError(`Expected \`stdio\` to be of type \`string\` or \`Array\`, got \`${typeof stdio}\``);

}

const result = [];

const len = Math.max(stdio.length, alias.length);

for (let i = 0; i < len; i++) {

let value = null;

if (stdio[i] !== undefined) {

value = stdio[i];

} else if (opts[alias[i]] !== undefined) {

value = opts[alias[i]];

}

result[i] = value;

}

return result;

};