JSDoc @arg and @argument tags not recognized as synonyms for @param

[joechung-msft]

TypeScript Version: 2.3

Recognize @arg and @argument as synonyms for the @param tag.

I don't know if this was by design or not, but @returns is recognized as a synonym for @return so I expected synonyms to work.

Code

// @ts-check

/**
 * @arg {string} input
 * @returns {string}
 */
export function foo(input) {
    return input.toLowerCase();
}

Expected behavior:
input is of type "string".

Actual behavior:
input is of type "any".

[joechung-msft]

For what it's worth, it looks like it is an easily correctable omission (including the code for the @returns synonym for reference).

case "param":
    tag = parseParamTag(atToken, tagName);
    break;
case "return":
case "returns":
    tag = parseReturnTag(atToken, tagName);
    break;

https://github.com/Microsoft/TypeScript/blob/a1a2006074a01ca0b75b08294377cc52302e3e71/src/compiler/parser.ts#L6505-L6511

[mhegazy]

@joechung-msft a PR would be appreciated.