Should throw error if the given string is not even a timestring

[gjgarryuan]

I observe that there is already a test case for timestring having unrecognized time unit at:

timestring/test.js

Line 88 in f7366f6

it('throws an error when an invalid unit is used in the timestring', () => {

However, the lib should do the same if the entire given string is not a timestring at all.

For now (release 5.0.0):

• timestring('test', 'milliseconds') => 0
• timestring('0test', 'milliseconds') => Error: The unit [test] is not supported by timestring

[gjgarryuan]

In addition, it will be great if a method can be exposed to check the validity of a timestring.

[prolink007]

I am also seeking this functionality.

[prolink007]

#43 I just submitted a PR to add in this error checking. Let me know if this is what you are desiring too, @garrychnca

[mike182uk]

Published #43 in 6.0.0