Add clear() function

[jaylinski]

Description

Adds a clear() function, as discussed in #72 (comment).

As noted in #72 (comment), implementing a "clear all events"-functionality via off() can be problematic, since events passed in the mitt all-param will get removed.
The clear()-method is more expressive in what it does.

Is an alternative to #105.

Is Map.clear() supported by all major browsers?

Yes. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map/clear

Relates to

#70 #72 #102

[jaylinski]

Error: compressed-size-action was unable to comment on your PR.
This can happen for PR's originating from a fork without write permissions.
You can copy the size table directly into a comment using the markdown below:

Size Change: +51 B (5%) 🔍

Total Size: 981 B

Filename	Size	Change
dist/mitt.es.js	227 B	+14 B (6%)	🔍
dist/mitt.js	227 B	+14 B (6%)	🔍
dist/mitt.modern.js	222 B	+10 B (4%)
dist/mitt.umd.js	305 B	+13 B (4%)

[developit]

I think I prefer this version, but I'm thinking of ways to offset the size impact.

Good call on the method name too, using clear is "free" since it's already in the dictionary due to map.clear().

[jaylinski]

Regarding size: the only thing I can think of would be to shorten the name from clear to rm (for remove) (now I get what you meant by "is already in the dictionary").

This is the size output when I run npm run build:

Build "mitt" to dist:
        198 B: mitt.js.gz
        189 B: mitt.js.br
        191 B: mitt.modern.js.gz
        164 B: mitt.modern.js.br
        196 B: mitt.es.js.gz
        191 B: mitt.es.js.br
        276 B: mitt.umd.js.gz
        234 B: mitt.umd.js.br

So still below 200 B on modern gz. :)

[jaylinski]

@developit Is there any chance you will merge and tag this in the next week or so?

(Otherwise I'll create my own fork in the meantime.)

[developit]

@jaylinski would you be okay if we merged the .all version instead? (your #105)

[jaylinski]

@jaylinski would you be okay if we merged the .all version instead? (your #105)

Yes, would be okay for me.

[developit]

closing now that #105 is merged!